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Патент USA US2413001

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De@ 24, 1946-
H. H. scHNECKLoTl-l
2,413,001
COMMUNICATION SYSTEM
Filed Sept. 2, 1944
3 Sheets-Skiset 1
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/NVEN ro@
H. H. SCH/VECKLOTH
@625mm
ATTORNEY
-ec. 24, 1946.
H; H. scHNEcKLcTl-l
2,413,001
COMMUNICATION SYSTEM
Filed sept. 2, 1944
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ATTORNEY l
' Dec. 24, 1946.
H. H. SCHNECKLOTH
2,413,001
COMMUNICATION SYSTEvM
Filed Sept. 2, 1944
.` l` DE
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2,413,001
Patented Dec. 24, 11946s
UNiTED STATES PATENT OFFICE
2,413,001 `
COMMÍUNICATION SYSTEM >
Harry H. Schneckloth, Forest Hills, N. Y., assign
or to Bell Telephone Laboratories, Incorporated,
New York, N. Y., a corporation of New York
Application September 2, 1944, Serial No. 552,418
22 claims. (Cl. 179-1752)
2
l
This invention relates to telephone systems and
particularly to systems comprising a master of
iice and one or more unattended automatic
oiïices.
It is the object cf the invention to improve the
arrangements for transmitting alarm signals
from unattended automatic oflices to a master
office.
It is usual to provide alarm apparatus in an
unattended dial cnice which is effective when a
trouble condition exists to seize a trunk to a
master ofñce and upon answer of the call by an
operator in the master officevto transmit a tone
signal to indicate that the call is a trouble alarm
call from 'the unattended oñice. It is also known
to provide a trouble checking line in the unat
tended ofñce with which connection may be es
tablished on a call from an operato;` or main
tenance test man in the master oflice to deter
mine whether any trouble exists, and the char 20
acter of the trouble, in the unattended oñice.
This invention is an improved alarm arrange
ment in a system comprising an attended master
office and a plurality of unattended dial oiiices
whereby on a trouble checking call initiated by 25
to insure that a check of the unattended dial of
ñce is made periodically by an operator in the
master ciflce to determine the conditions existing
in the unattended ofûce.
-
The invention will be better understood by
considering a system in which the invention and
its features are embodied, one such system being
shown schematically in the drawings which form
a part of this specification and consists of three
figures arranged in succession left to right. The
invention is, however, not limited in its applica
tion to the specific arrangement and system 1
shown but is generally applicable to alarm sig
naling systems between attended and unat
tended oñices.
Referring to the drawings:
Fig. l shows the alarm signaling apparatus AL
in a master oñice;
Fig. 2 shows an operator’s position comprising
the cord CDI, a trunk circuit TCH associated
with a trunk TI extending to one unattended dial
office, and a trunk circuit TG2 l> associated with a
trunk extending to another unattended dial of
fice; and
Fig. 3 shows, in an unattended dial office, a
trunk circuit TCI2, an incoming selector ISI as
sociated with the trunk circuit TCI2, a connector
unattended dial oñices, signals are transmitted
Cl and alarm apparatus ALI. Fig. 3 also shows
from the unattended office to operate a visual
a subscriber’s station A, line LI and line circuit
signal apparatus in the master office indicating
that no trouble exists in the dial office or indi 30 LCI, a line ñnder LFI and a first selector SI for
use in establishing connections on calls originat
cating the character of the trouble which does
ing in the dial ofûce.
~
exist ín the dial oflice, there being a set of such
The subscriber stations in the unattended dial
signals in the master omce for each dial office
oflices are of the type provided on lines termin
from which alarm signals are received.
ating in common battery central offices and each
A feature cf the invention is the provision of
an operator in the master office to any one of the
signal transmitting apparatus in an unattended
dial oflice for transmitting to a master oflice voice
frequency signals of different frequencies. One
frequency is used to indicate that no trouble ex
ists in the dial office, and each of the other fre
quencies indicates a different kind of trouble in
the office.
`
Another feature of the invention is the provi
sion of signal receiving means in the master of
ñce for receiving voice frequency signals of dif- -Y
ferent frequencies for the different alarm condi- v
tions which may exist in a connected dial office
and for indicating that no trouble exists in the
dial ofñce if such is the case.
Another feature of the invention is the provi
sion in an attended oiñce of signal means for in
dicating whether or not any trouble exists in an
unattended automatic oflice, the operation of the
signal means being maintained for a predeter
mined length of time after its operation, thereby
includes a dial or other impulse sender for con
trolling the operation of automatic switches
through which desired connections are estab
lished. The line circuit LCI which comprises a
line and a cut-oil relay connects the line Ll to
terminals in the banks of line finders for origin
ating traffic and to terminals in the banks of
connector switches similar to the connector CI for
terminating traiiic. The line finder, selector and
connector switches may be of the well-known
two-motion step-by-step type. Reference may be
had to Automatic Telephony by Smith and
Campbell, 2d Edition, pages 53 to 65 for a de
scription of the structure of such switches and
their operation when used as selectors and con
nectors. Reference may be had to the patent to
R. L. Sto-kely, No. 1,799,654, April ’7, 1931, for a
description of the operation of a step-by-step line
finder. Each of the switches LFI, SI, ISI and CI
is represented in the drawings by a set of brushes
2,413,001`
3
4
and a single set of terminals, all omitted appara
tus being represented by the broken lines con
nected t0 the brushes.
The alarm equipment ALI comprises a line re
associated with the operated one of keys KI I and
KEI.
lay |5| connected to the tip and ring terminals
of the terminal set I 5i! in the banks of a group of
the calling line to a first selector SI and that the
selector SI is actuated in response to the dial
connectors including the connector CI, a trans
impulses created by the dialing of the iirst digit
former |52, alarm »relays |62, |63 and |54 and
of the called subscriber’s number to select the ter
minals .connecting to trunk circuit TCI2. When
the cut-through relay (not shown) of the selector
SI operates to extend the connection from the
conductors of line LI to conductors I 0I and |02
of trunk circuit TCI2, the line relay I II of trunk
circuit TCI2 is operated by the curent in a circuit
traced from battery through the upper winding
of relay IIl, a lower back contact of relay |59,
_lower right winding of repeating coil I I 0, another
sources lli, |12, VI`|3 land Il@ of alternating cur
rent of frequencies FI, F2, F3 and F4 respec
tively. Ii there is no trouble condition existing
in the dial oiîice shown in Fig. 3 nonerof re
lays |52, |63 or lßrl is operated. Rel-ay I 62 is op
erated when any fuse in the dial oiiîce has burned
out; relay E53 is operated when a permanent sig
nal »condition exists in the dial office; and relay
|53 is operated when any other alarm condition
exists in the dial office.
_
The trunk circuit TC! I, terminating trunk TI
in the master cinc-e and the trunk circuit TC|2
terminating the trunk TI in dial office | are
shown in detail and the operation of each of these
trunk circuits is hereinafter described on calls
in both directions. The trunk circuit TCZI ter
minating a trunk to a second dial oi’iìce is similar
to the >trunk circuit TCE I. The cord CDI and
the operator’s dial and telephone are shown sche
matically and may be similar to the cord and
position equipment disclosed in detail in the pat
ent to King and Miller No. 2,203,765 granted July
23, 1940.
'
The alarm equipment AL in the master cnice
comprises signal receiving relays II, 2|, 3| and
lll selectively connected by ñlters IB, 28, 3i] and
4|) to the jack J I. Each of the filters is tuned
to pass current of a diiîerent one of the frequen
cies used for transmitting alarm signals from an
unattended dial o?ñce to the master oiiice. The
alarm apparatus AL further comprises alarm
Assume now that a call is originated at station
A, that the line finder LFI is operated to extend
lower back contact of relay |69, conductor |52,
middle brushes of selector SI and line ñnder
LFI, lower conductor of line LI, through the tele
phone at station A, the other conductor of line
LI, top brushes of line finder LFI and ‘selector
SI, conductor It! I, an upper back contact of relay
|59, upper right winding of repeating coil I I0, an
other upper back contact of relay |09 and
through the lower winding of relay I I I to ground.
Relay I I l closes a circuit for operating relays |35
and H2. Relay |55 connects ground to conduc
tor |03 to hold the switching relay (not shown)
of selector SI and to guard the trunk circuit TC l 2
against seizure lby any other selector having ac
cess thereto. Relay II2 connects ground to con
ductor MSl to start the ringing machine motor
(not shown) and closes a connection from the
ringing source RG through condenser |55 and a
back Contact of relay |84 to conductor IDI so as
to transmit a ringing tone to the calling sub
scriber as -an indication that the operator in the
master oñice is being signaled. The operation of
apparatus individual to each unattended oiiice 40 vrelay |I2 interchanges the connections between
from which alarm signals may be received. The
the windings of relay II3 and the conductors of
ala-rm apparatus individual to dial oílice I com
trunk TI leading to the master office, thereby
prises keys KII and KIZ, gas-filled discharge
reversing the current through `these conductors
to effect the operative energization of both wind
lamps LII to Llfl, and a timing relay TRI; the
alarm apparatus for a second dial oilîce comprises
ings of the polarized relay 5I of trunk circuit
keys KZi and X22, gas-filled discharge lamps
TC! I. Although the windings of relays II3 and
L2! to L24, and a timing relay TR2. The lamps
5I are normally connected in a closed circuit over
LI-| and LEI are provided for indicating that
trunk T! , the .current in this circuit is not strong
enough to operate the marginal relay IIS and is
there is no trouble existing in the corresponding
dial office; the lamps L|2 and L22 are provided
in the non-operate direction with respect to relay
5I, The circuit for operating relay 5I may be
for indicating a fuse alarm condition in the cor
traced from battery through the lower winding
responding oñice; the lamps LI 3 and L23 are pro
vided for indicating a permanent signal condition
of relay IIB, a front contact of relay IIE, upper
in the corresponding dial oñce; and the lamps
left winding of repeating coil IIB, upper conduc
LI li and L24 are provided for indicating any other , `tor of trunk TI, upper` back contact of relay
alarm condition which may exist in the corre
62, upper right winding of repeating coil 59, both
sponding dial om’ce. The timing relays TRI and
windings of relay 5I, lower right winding of re
TR2 are aranged to operate a predetermined in
peating coil 59, lower conductor of trunk TI,
terval, for instance, half an hour after the light
lower left winding oi repeating coil III), a front
ing of any of the associated lamps, so as to extin 60 Contact of relay l I2, and through the upper wind
guish the lamp and thereby indicate that it is
ing of relay IIS to ground. The operation of
time to again check the alarm conditions exist
relay 5I closes a circuit for operating relay 52.
ingin the corresponding unattended dial office.
Relay 52 closes a circuit for lighting the multiple
The voltage of _the .battery B2 normally con
answering lamps 53 and a circuit Yfor operating
nected in series with the winding of each of the
relay 54. Relay 54 closes a circuit for operating
timing relays and the associated lamps is insu?û
relay 55. Relay 55 closes a circuit for lighting
cient to effect breakdown of any lamp but is
the multiple busy lamps 51 and connects a busy
suñicient to maintain the energization of any
potential through resistor 55 and the upper wind
lamp after breakdown until the associated tim
ing of relay 5l to the sleeve of jack J Ill.
ing relay opens the circuit therethrough. With 70 When an operator answers the call by inserting
key KII or -KZI actuated and with any one of
vthe plug P2 of a cord CD5 in jack JIG, a circuit
relays li, 2|, -35 or lll operated, the voltage of
is closed vfrom battery in the operator’s position
batteries BI and B2 in series is sunicient to break
circuit, through the sleeve conductors of plug P2
down the lamp corresponding to the operated one
»and jack J-Iû and the lower, high-resistance
of relays lI, 2|, 3| and 4I in the set of lamps 75 winding of relay 5i to ground. Relay 51 oper
.2,413,001
6
S
lay 58 closes a circuit for operating relay 6|;
the outer lower front contact of relay 58, through
resistor 6B, upper back contact of relay 54,»inner
closes a short-circuit around the upper, high-re
upper front contact of relay 6I and lower right
sistance winding of relay 5I thereby causing the
operation of relay IIS of trunk circuit TCI2;
winding oi repeating coil 59, to the ring conduc
ates closing a circuit for operating relay 58. Re
tor oi' jack J Iü. The operation of relay 54 closes
a circuit for operating relay 55; and relay 55
opens the busy potential connection between re
sistor 5B and the sleeve of jack JIU; and opens
lights the multiple busy lamps 5l, The operation
the circuit through the winding of relay 52 to
release this relay and thus extinguish lamp 53.
of relay I I 3 of trunk circuit TCIZ closes a cir
cuit, including back contacts of relays m5 and
i I2, through the winding of relay HB9. Relay I B9
operates thereby connecting its winding to sleeve
conductor |33 of the associated incoming selec
tor ISI and extends ground potential to conduc
tor H13 to -mark the trunk circuit TCI2 as busy
Relay 6I closes a holding circuit for relay 55 and
completes the talking connection between the
left windings of repeating coil 55 and the line
conductors of jack J II).
The aforementioned operation of marginal re
lay I I3 of trunk circuit TCIZ when the call is an
swered by an operator in the master oñice, closes
a circuit for operating relay Iz‘lel. Relay Imi dis
connects condenser ISG from conductor IIlI to
in the banks of selectors having access thereto.
Relay H39 closes a bridge comprising the winding
of relay Ilë and resistor II5 in parallel across
conductors ISI and |32 of selector ISI to operate
the line relay (not shown) to prepare the selec
' end the transmission of ringing tone to the call
tor for operation by dial impulses. The selector
ing subscriber, disconnects ground from the ring
ISI connects holding ground potential to sleeve
ing-machine motor-start conductor MS, and
conductor I33 in usual manner to hold relay I 09.
closes a circuit ior holding relay m5. The talk
When the calling operator operates the posi
ing connection between the calling line and the
tion dial key (not shown), a circuit for operat
operator in the master oiiice includes the repeat
ing coils 59 and IIB and the connection is under 25 ing relay 6G is closed from battery in the position
circuit OP through the tip conductors of plug
the joint control of the calling subscriber and the
P2 and jack J Ill, a front contact relay 6I, upper
answering operator. When the calling sub
left winding of repeating coil 53 and the winding
scriber releases the connection, relay I Il releases.
The release of relay I II causes the release of re
lay II2, thereby restoring the current over trunk
TI to its normal direction to eiiect the release of
relay 5I of trunk circuit TCII in the'master of
fice, After relay III releases, relay I55 is held
under the joint control of relays H3 and Iilíl.
The release of relay 5I of trunk circuit TCI I con
nects ground to the upper, low-resistance wind
ing of relay 5l, thereby causing the lighting of
of relay 54 to ground. Relay 54 operates, closing »
^ a circuit for operating relay 65 and connecting
the tip of jack J I0 through repeating coil 59 to
the winding of relay 54, independent of the con
tact of relay 6I. Relay 65 closes a circuitvior
holding relay 54 operated and closes a circuit
from ground through the upper winding of relay
52, winding of relay 63, lower front contact of
relay 55, lower left winding of repeating coil 59,
ring conductors of jack J I5 and plug P2, through
the supervisory lamp in the operator’s cord circuit
the impulse contacts of the operator’s dial, to bat
as a disconnect signal. When the plug P2 of cord
CDi is disconnected from jack JIE, relay 5l re 40 tery. Relays'BZ and 63 operate. Relay S2 locks
leases.
The release of relay 5l causes the suc
cessive release of relays 53 and 6I. Relay 52 re
operates if relay 5I has not yet released. The
release of relay 53 opens the short-circuit around
the upper, high-resistance winding of relay 5I
thereby causing the release of relay H3 of trunk
circuit TCI 2. The release of both of relays III
and I I3 in trunk circuit TCIZ causes the release
of relays IM and HB5.
Relay I?5 disconnects
ground potential from conductor HB3 to cause the ,
release of the selector SI and the return of the
selector SI and line finder LFI to normal. The
release of relay bld reconnects conductors I3I
and |32 to the line relay (not shown) of the in
coming selector ISI, thereby preparing trunk TI
for seizure on another call in either direction.
Assume next that the operator in the master
under control of relays 64 and 58 and opens the
circuit through the winding of relay 6 I. The re
lease of relay 6I -disconnects the ring conductor
of jack J I0 from condenser 5B and short-circuits
the upper winding of relay B2 to prepare relay 53
for response to dial impulses. Relay 62 is held
operated by the energization of its lower winding
in a circuit including its lower front contact, a
front contact of relay 64, and a front contact of
relay 53. With relays 63 and G2 operated, the
impulse repeating contacts of relay 63 are con
nected across the conductors of trunk TI in place
of the bridge comprising the lower winding oi
relay 5I. When the operator dials the digits of
a called subscriber’s number, relay 63 is alter
nately released and reoperated responsive to the
dial impulses of each train thereby created.
Corresponding impulses are transmitted by the
oilice connects the plug P! of cord CDI with jack
contacts of relay 63 over trunk TI to relay II3
J I associated with the alarm equipment AL and
connects the plug P2 with jack J I9 to make a 60 of trunk circuit TC I 2. When dialing is completed,
the restoring of the operator’s dial key discon
call to dial oñice I. Relay 5l operates in a cir
nects battery from the tip of the cord, releasing
cuit including the sleeve conductors of jack J It
and plug P2 to battery in the operator’s position
circuit. Relay
closes a circuit for operating
relay 65. Relay 64 opens the connection between
repeating coil 59 and the tip of jack J I5, short
relay 58. Relay 55 closes a short-circuit around
the upper winding of relay 5I to eiîect the oper
ation of relay M3 of trunk circuit TCIZ, closes a
circuits the contacts of relay 63, and releases re
lays 65 and 62. The release of relay G5 discon
nects the winding of relay 53 from the ring con
'ductor of jack J Il! and opens the holding circuit
circuit for operating relay 5I, and connects
ground to the upper winding or relay 5l to eiîect
the lighting of the supervisory lamp in the cord
circuit CDI. Relay 5I closes a circuit for oper
ating relay 5a; closes a connection from the
winding of relay 54, through the upper left wind
ing of repeating coil 59, to the tip conductor of
jack J I0; and closes a connection from ground at 75
of` relay 54. The release of relay 62 disconnects
the contacts of relay 53 from the conductors of
trunk TI and reestablishes the bridge, compris
ing the lower winding of relay 5I, across these
conductors.
The release of relay 52 causes the
reoperation of relay 5I and the completion of the
talking connection between jack J I0 and re
2,413,001'
'î
8
peating coil 59. The reoperation of relay 6| re
closes the circuit for operating relay 54. Since
relay 55 is slow in releasing, it remains operated
during the transfer of the conductors of trunk
TI to and from dialing conditions.
In response to the dial impulses thus trans
mitted over trunk TI by the contacts of relay 63,
ing to the last two digits of the called number
to select the trouble checking terminals |50 asso
ciated with the alarm equipment ALI. In this
case the bridge consisting of the Winding of relay
I5| and left winding of transformer |52 effects
the tripping of the ringing and closure of the
talking circuit through the connector CI in usual
relay IIS of trunk circuit TCIZ is alternately re
leased an'd reoperated. When relay IIS releases
manner. If at the time relay ’I5I operates there
is no trouble existing in this dial oiiìce, none of
in response to the first impulse of each train, it
opens the bridge across conductors ISI and |32
and closes a circuit including a back contact of
relay I I2 and a front contact of relay |59 for
operating the sloW-to-release relay Ie'I. With
relay Iû‘I operated, the reoperation of relay IIS 15
relays |62, ||I3 and |64 are operated; and a cir
cuit is closed from the alternating current source
I'II of frequency FI through a back contact of
each of relays |62, |63 and IE5 in series, a front
closes a bridge comprising resistor |38 across con
ductors I 3| and |32 in place of the bridge com-l
prising the winding of relay IIL‘I.
Relay IQ'I is.
slow to release and remains operated while a train
of impulses is being repeated by relay IIS. The
release of relay |21, when relay IIS remains op
erated at the end of a train of impulses, recon
contact of relay I5I, and the right winding of
transformer |52 to transmit current of frequency
FI through transformer |52 and the talking
conductors of connector CI, selector ISI, trunk
circuit TCI2, trunk TI, trunk circuit TCII and
cord CDI, to the alarm equipment AL in the
master office. The current thus transmitted is
transmitted through ñlter I0 to operate relay
iI without effecting the operation of any one oi
nects the Winding of relay lié across conductor:
relays 2|, 3| or 4I. If fuse alarm relay |62 is
ISI and |32 for response to supervisory signals.
operated, current of frequency F2 is transmitted
The first train of impulses repeated by reiayc 25 from source |72 through transformer |52 and the
‘63 and I I3 controls the operation of the incozr» ig;
talking connection to effect the operation of re
selector ISI to select a corresponding group of
lay 2| of alarm apparatus AL in the master
terminals. The selector ISI is thereupon oper
oflice, the filter
being tuned to pass current
ated automatically to select an idle set of ter
of frequency F2. If the permanent signal alarm
minals in the selected groupl which terminals are
relay |63 is operated, current of frequency F3 is
connected to a connector CI. The impulses cre
transmitted from source |13, through trans
ated by the dialing of the last two digits of the
former |52 and the talking connection to alarm
called number are repeated by relays |33 and H3
apparatus AL» to eiîect the operation of relay 3|,
to the line relay ILlI of a connector CI to selec
filter 30 being tuned to pass current of frequency
tively operate the connector and thereby com
F3. "And, if other trouble conditions exist in
plete a connection with the called line terminals.
oiiice I such as failure of the ringing equipment,
If the called line is idle, the called station is sig
relay |64 is operated and current of frequency
naled in usual manner; and, if the call is an
FII is transmitted from source I'III, through trans
swered, relay Idd is operated to reverse the direc
former |52 and the talking connection to alarm
tion of current through conductors ISI and |32 40 apparatus AL to operate relay 4|, the nlter 40
to operate relay IIII. Relay II4 closes a circuit
being tuned to pass current of frequency F4.
for operating relay IIZ; and relay II2 eñects the
The operator noW momentarily actuates key KI I
reversal of current through conductors of trunk
to connect the signal lamps LII, LIZ, LIS and
TI to operate relay 5I of trunk circuit TCI I. The
LIII to conductors I2, 22, 32, 42, respectively.
operation of relay 5I disconnects ground from the u. ci' The voltage thus applied across the lamp cor
upper winding of relay 5l to extinguish the super
responding to the operated one of relays II, 2|,
visory lamp in the operator’s cord circuit. The
3| and 4I is high enough to cause ionization. of
talking connection between the operator and the
the gas in that lamp. The operator may then
called subscriber includes the repeating coils 5e
release key KII and disconnect the cord CDI
and I I5 and is under the sole control of the oper 50 from jacks J I and J I0, the voltage of battery B2
ator.
being sufficient to maintain the energization of
If the called subscriber restores the telephone to
any one of the signal lamps LII to LI II which
normal before the operator disconnects, relay
has been energized. Thus a continuing signal
|44 releases so as to restore the direction of cur
indicative of the maintenance conditions in the
rent through conductors I3I and |32 and thereby 55 oflice I is given until the timing relay TRI oper
cause the successive release of relays I I 4, I I2 and
ates. This relay is designed to operate in series
5 I, and the lighting of the supervisory 'lamp in the
with any one of the signal lamps at the end of a
operator’s cord circuit. When the operato-1' dis
desired interval, for instance half an hour. The
connects, relays 51, 58, 3|, 54 and 55 are re
operation of relay TRI extinguishes the lighted
leased. The release of relay 5% opens the sliert
circuit around the upper Winding of relay 5I 60 lamp, thereby indicating to the operator that a
check of the alarm conditions at the dial ofiice
thereby causing the release of marginal relay I I3
has not been made Within this interval. An
in trunk circuit TCI2. The release of relay IIS
energized signal lamp may be extinguished prior
opens the operating circuit of relayV |639 and opens
the bridge across conductors I 3| and |32 there 65 to the operation of relay TRI by the operation
of the release key KIZ.
by causing the release of the incoming’ selector ISI
A check of the conditions existing in dial
and the release of the connector CI. If the called
office 2 may be made by connecting a cord CDI
subscriber has failed to disconnect, the Vconnector
is held operated but the incoming selector ISI
to jacks J I and J ZI), dialing the trouble checking
is restored to normal in the usual manner. When 70 number for dial office 2 and operating key K2I,
thereby effecting the lighting of that one of lamps
the called subscriber releases, the connector
switch is also restored to normal in usual and
L2! to L24 which corresponds to the condition
Well-known manner.
Assume next that the connector CI has been
selectively operated by dial impulses correspond
existing in dial ofñce 2 in similar manner to that
in which the alarm lamps for dial cnice I are
75 energized as above described.
2,413,001
9
What is claimed is:
1. In a telephone system, an unattended dial
oñîlce, a master oliice, alarm apparatus in the un
attended oflice responsive selectively to a plurality
of trouble conditions, signal receiving means in
the master oi'lice, means including an interofûce
trunk for connecting said signal receiving means
to said alarm apparatus, and a set of alarm
10
ond characters, means comprising a trunk be
tween said oiîices connecting said signal receiv
ing means to said signal sending means, signal
means selectively energized by said signal receiv
ing means to indicate the condition existing in
the unattended oiîice, means for maintaining the
energization of said signal means after the con
nection between said signal sending and signal
receiving means is ended, means for terminating
signals in said master oiîice controlled by said
signal receiving means for visually indicating 10 the energization of said signal means a predeter
the existence of any of said plurality of trouble
conditions in the unattended oiiîce.
2. In a telephone system, an unattended dial
oiiice, an attended oflice, signal sending means
in said unattended office for selectively sending
a signal of a first character when no trouble
exists in the unattended oñîce and for sending
a signal of a second character when a trouble
condition exists in the unattended cmce, signal
receiving means in said attended o?lice for selec
tively responding to signals of said ñrst and sec
ond characters, means comprising a trunk be
tween said o?lices connecting said signal receiv«
ing means to said signal sending means, and
visual signal means selectively controlled by said
signal receiving means.
3. In a telephone system, an unattended dial
office, an attended oiiice, signal sending means
in said unattended ofñce for selectively sending
mined interval of time after the connection be
tween said signal sending and said signal receiv
ing means is ended, and other means for ending
the energization of said signal means,
6. In a telephone system, an unattended dial
oflice, an attended omce, a trunk between said
oîlces for use in completing connections between
calling and called lines, means in said unattend
ed oflice for sending any one of a plurality of sig
20 nals each of a different character, means in said
unattended cnice preparing said signal sending
means to send a signal of one character when no
trouble condition exists in said unattended oñice
and for selectively preparing said signal sending
means to send a signal of a different character
when a trouble exists in the unattended office, the
character of the signal depending on the charac
ter of the trouble, signal receiving means in the
attended office for selectively responding to a sig
a signal of a ñrst character when no trouble 30 nal of any one of said characters, means compris
exists in the unattended office and for sending a
signal of a second character when a trouble con
dition exists in the unattended office, signal ren
ceiving means in said attended oince for selec
tively responding to signals of said first and sec«
ond characters, means comprising a trunk be
ing said trunk for connecting said signal receiv
ing means to said signal sending means, and vis
ual signal means in said attended oiiice selective
ly controlled by said signal receiving means.
7. In a telephone system, an unattended dial
cnice, an attended oñice, a trunk between said.
offices for use in completing connections between
calling and called lines, means in said unattended
omce for sending any one of a plurality of signals
tween said ofñces connecting said signal receiv
ing means to said signal sending means, signal
means selectively energized by said signal re
ceiving means to indicate the condition existing 40 each of a difierent character, means in said unattended office preparing said signal sending
in the unattended oñ‘ice, and means for main
means to send a signal of one character when no
taining the energization of said signal means
trouble condition exists in said unattended office
after the connection between said signal send
and for selectively preparing said signal sending
ing and signal receiving means is ended.
4. In a telephone system, an unattended dial ,is c.., means to send a signal of a diiîerent character
when a trouble exists in the unattended ofûce,
oflice, an attended oiiice, signal sending means in
the character of the signal depending on'the
said unattended oiiice for selectively sending a
character of the trouble, signal receiving means
signal of a ñrst character when no trouble exists
in
the attended ofñce for selectively responding
in the unattended oiîice and for sending a signal
of a second character when a trouble condition
exists in the unattended cnice, signal receiving
means in said attended office for selectively re
5 O to a> signal oi any one of said characters, means
comprising said trunk for connecting said signal
receiving means to said signal sending means,
visual signal means in said attended oilice selec
sponding to signals of said i‘lrst and second char
tively controlled by said signal receiving means
acters, means comprising a trunk between said
to indicate the condition existing in the unat
oñices connecting said signal receiving means to
tended omce, and means for maintaining the en
said signal sending means, signal means selec
ergization of said signal means after the connec
tively energized by said signal receiving means to
tion between said signal sending and signal re
indicate the condition existing in the unattended
ceiving means is ended.
oñice, means for maintaining the energization of
said signal means after the connection between- 60 8. In a telephone system, an unattended dial
office, an attended oiiice, a trunk between said
said signal sending and signal receiving means
o?lices for use in completing connections between
is ended, and means for terminating the ener
calling
and called lines, means in said unattend
gization of said signai means a predetermined in
ed ofûce for sending any one of a plurality of
terval of time after the connection between said
signals each oi a different character, means in
signal sending and signal receiving means is
said
unattended omce preparing said signal send
ended.
ing means to send a signal of one character when
5. In a telephone system, an unattended dial
no trouble condition'exists in said unattended office
oüce, an attended office, signal sending means
and for selectively preparing said signal sending
in said unattended oîïñce for selectively sending
a signal of a iirst character when no trouble ex
7 O means to send a signal of a different character
when a trouble exists in the unattended oii‘ice, the
ists in the unattended office and for sending a
character of the signal depending on the charac
signal of a second character when a trouble con
ter of the trouble, signal receiving means in the
dition exists in the unattended of?ce, signal re
attended oiiìce for selectively responding to a
ceiving means in said attended oiîice for selec
tively responding to signals of said ñrst and sec 75 signal of any one ofv said characters, means com
@413,001
12
trunks for connecting said signal receiving means
prising said trunk for `connecting said signal re
ceiving means to said signal sending'means, vis
tothe signal sending means in any desiredoneof
ual signal means in said attendedofñce selec
said unattended ofñces, like signal means in said
tively controlled by said signal receiving means,
attended cnice for each of said unattended offices
signal means selectively energized by said signal
arranged for selective control by said signal re
receiving means to indicate the condition exist
ceiving means, means for connecting the signal
receiving means to the signal means correspond
ing in the unattended oiiîice after the connection
ing to the unattended oñice the signal sending
between said signal receiving means is ended, and
means for terminating the energization of said
means of which is connected to said signal re
signal means a predetermined interval of time 10 ceiving means, thereby to eiîect the selective en
after the connection between saidA signai send
ergization of the signal means, and means in
ing and signal receiving means is ended.
said attended oiiice for each of said signal means
9. In a telephone system, an unattended dial
for maintaining the energization of the asso
oflice, an attended office, a trunk between said
ciated signal means after the connection between
oiîices for use in completing connections between
the signal receiving means and the signal send
ing means ofthe corresponding unattended oilice
calling and called lines, means in said unattended
oñice for sending any one of a plurality of signals
is terminated.
12. In a telephone system, a plurality of un
attended oiiices, an attended oiñce, trunks be
means to send a signal of one character when no 20 tween said attended oihce and each of said un
trouble condition exists in said unattended of
attended offices, like means in each of said un
nce and for selectively preparing saidsignal send
attended cnices for sending a signal of one char
each of a different character, means in said un
attended cnice preparing said signal sending
ing means to send a signal of a different charac
ter when a trouble exists in the Vunattended of
ñce, the character of the signal depending on the
character of the trouble, signal receiving means
acter when no trouble condition exists in the un
attended office and a signal of a diiîerent char
acter when a trouble condition exists in the un
attended office, signal receiving means in the un
in the attended oñice for selectively responding to
attended oilice for selectively responding to a sig
nal of either character, means comprising said
trunks for connecting _said signal receiving means
a signal of any one of said characters, means
comprising said trunk for connecting said’signal
receiving means to said signal sending means,
visual signal means in said attended >oiiîlce se
lectively controlled by said signal receiving means
to indicate the condition existing inthe unat
tended oiiice, means for maintaining the energi
to the signal sending means in any desired one of
said unattended omces, like signal means in said
attended office for each of said unattended offices
arranged for selective control by said signal re
ceiving means, means for connecting the signal
zation of said signal means after the‘connection CO In receiving means to the signal means correspond
between said signal sending and signal receiving
ing to the unattended oiiice the signal sending
means is ended, means for terminating the ener
gization of said signal means a predetermined in
means of which is connected to said signal re
ceiving means, thereby to eiîect the selective en
terval of time after the connection between said
ergization oi the signal means, means in said at
signal sending and signal receiving means is 40 tended ofñce for each of said signal means for
maintaining the energization of the associated
ended, and other means for ending the energiza
tion of said signal means.
signal means after the connection between the
l0. In a telephone system, a plurality of un
signal receiving means and the signal sending
attended oñices, an attended oiñce, trunks be
means of the corresponding unattended oñice is
tweensaid attended oince and each of said unat
“ terminated, and like means in said attended of
?ce for each of said signal means for terminating
tended oiîices, like means in each of said unat
tended oñjces for sending a signal of one charac
the »energization of the associated signal means a
ter when no trouble condition exists in the un
predetermined interval of time after the connec
tion between said signal receiving means and the
attended cnice and a signal of a different char
signal sending means of the corresponding un
acter when a trouble condition exists in the un- .
attended oii‘ice, signal receiving means in the un
attended of?ce is terminated.
attended ofiice for selectively responding to a sig
13. In a telephone system, a plurality of un
nal of either character, means comprising said
attended oiiices, an attended oî?ce, trunks be
trunks for connecting said signal receiving
tween said attended oiiice and each of said un
means to the signal sending means in any de
attended oiñces, like means in each of said un
attended ofñces for sending any one of a plurality
sired one of said unattended oiiices, like signal
means in said attended oiiice for each of said un
of signals each oi a different character, alarm
attended oii‘lces arranged for selective control by
means in each unattended ofñce preparing the
signal sending means to send a signal of one
said signal receiving means, and means for con
necting the signal receiving means to the signal (Si) character when no trouble exists in the unat
tended oiiice and for :preparing the signal send
means corresponding to the unattended cnice the
ing means to send a signal of a different charac
signal sending means of which is connected to
ter when a trouble exists in the una tended of
said signal receiving means, thereby to effect the
nce, the character of the signal depending on
selective energization of the signal means.
the character of the trouble, signal receiving
1l. In a telephone system„a plurality of un
means in the attended oiiice for selectively re
attended l ofiices, an attended pince, trunks ` be
sponding to a signal of any one of said charac
tween said .attended oii‘lce and each of said un
ters, means comprising said trunks for connect
attended oñices, like means in each ofA said unat
tended ofñces for sending a signalofone Achar
ing said signal receiving means to the signal
acterwhen no trouble condition exists in-the un
sending means in any desired one of said unat
attended'oiiice and ya'sienal oía different char
tendedofñces, sets of signal devices in said at
tended ofñce, one set for each unattended ofñce,
and means for connecting said signal receiving
means to the signal set corresponding to the un
attended4 oiiice the signal sending means of which
acter when a trouble condition exists in the un
attended office, signal receiving means in the un
attendedo?ñce'for selectively responding to a sig
nal of „eithercharacterg means comprisingsaid
‘
'
2,413,001
13
is connected to said signal receiving means,
thereby to eiîect the selective energization of said
set of signal devices.
14. In a telephone system, a plurality of unat
tended offices, an attended ofñce, trunks between
said attended office and each of said unattended
offices, like means in each of said unattended
offices for sending any one of a plurality of sig
nals each of a different character, alarm means
in each unattended cnice preparing the signal
sending means to send a signal of one character
when no troullcle exists in the unattended oiiice
and for preparing the signal sending means to
send a signal of a.' different character when a
trouble exists in the unattended oiiice, the char
acter of the signal depending` on the character of
the trouble, signal receiving means in the at
tended office for selectively responding to a sig~
nal of any one of said characters, means com
14
an unattended oñ'ice, a trunk I'between said of
iices for completing connections between calling
and called lines in said omces, signal receiving
means in said attended cnice, a trouble checking
line in said unattended cnice, means including
said trunk for connecting said signal receiving
means to said trouble checking line, signal send
ing means associated with said line comprising
a source of current of a first frequency and a
source of current of a second frequency, means
comprising a trouble alarm relay in said unat- _
tended oñice for connecting the source of the first
frequency to said signal sending means when no
trouble exists and for connecting the source of
the second frequency to said signal sending
means when trouble exists in said unattended
oii'ice, said signa-l receiving means comprising two
relays and ñlters for selectively transmitting cur
rent of a diiferent one of said frequencies to each
prising said trunks for connecting said signal 20 of said relays, a signal device for operation when
no trouble exists in the unattended office and a
receiving means to the signal sending means in
signal device for operation when trouble exists
any desired one of said unattended offices, sets
in the unattended office, and means for connect
of signal devices in said attended oiiice, one :set
ing said devices to said signal receiving means
for each unattended oiiice, means for connecting
thereby to effect the operation of the one or the
said signal receiving means to the signal set cor
other of said signal devices according to Whether
responding to the unattended office the signal
sending means of which is connected to said sig
nal receiving means, thereby to effect the selec
tive energization of said set of signal devices, and
or not trouble exists in the unattended oince.
17. In a telephone system, an attended oñ‘ìce,
an unattended oñice, a trunk between said offices
means in said attended office for each of said sets 30 for completing connections between calling and
of signal devices for maintaining the energize
tion of the associated set of signal devices after
the connection between the signal receiving
means and the Signal sending means of the cor
responding unattended office is terminated.
15. In a telephone system, a plurality of un
attended ciiices, an attended oiiice, trunks be
called lines in said oflices, signal receiving means
in said attended oñice, a trouble checking line in
said unattended oiiice, means including said
trunk for connecting said signal receiving means
to said trouble checking line, signal sending
means associated with said line comprising a
source of current of a first frequency and a source
of current of a second frequency, means com
tween said attended office and each of said un
prising a trouble alarm relay in said unattended
attended offices, like means in each of said un
attended onices for sending any one of a plurality 40 oiiice for connecting the source of the iirst fre
quency to said signal sending means when no
of signals each cf a. different character, alarm
trouble exists and for connecting the source of
means in each unattended office preparing the
the second frequency to said signal sending means
signal sending means to send a signal of one
Vwhen trouble exists in said unattended omce, said
character when ne trouble exists in the unate
tended oihce and for preparing the signal send
ing means to send. a signal of a different chai»
acter when a trouble exists in the unattended
signal receiving means comprising two relays and
íilters for selectively transmitting current of a
diiîerent one of said frequency to each of said
relays, a signal device for operation when no
the character of the trouble, signal receiving
trouble exists 'm the unattended cnice and
means in the attended oihce for selectively re 50 a signal device for operation when trouble
spending to a signal of any one of said charac
exists in the unattended office, means for
ters, means comprising said trunks for connect
connecting said devices to said signal receiving
ing said signal receiving means to the signal send
means thereby to eiîect the operation of the one
ing means in any desired one of said unattended
or the other of said signal devices according to
oflîces, sets of signal devices in'said attended
whether or not trouble exists in the unattended
office, one set for each unattended office, means
oñ‘ice, and means for maintaining the operation
for connecting said signal receiving means to the
of either one of the signal devices for a predeter~
signal set corresponding to the unattended oli‘ice
mined interval after the connection between said
the signal sending means of which is connected to
signal receiving means and said trouble checking
said signal receiving means, thereby to effect the
line is terminated.
selective energization of said set of signal devices, 60
18. In a telephone system, an attended oñice, a
oiiice, the character of the signal depending on
means in said attended oflice for each of said sets
of signal devices for maintaining the energica
plurality of unattended oflices, each comprising
lines including a trouble checking line and
switches for seizing called lines, trunks between
said attended and each of said unattended of
nces, signal receiving means in said attended
responding unattended ciiice is terminated, and
ofûce, means including said trunks and switches
like means in said attended odi-ce for each of said
for connecting said signal receivingv means to said
sets of signal devices for terminating the enerw
trouble -checking lines, one at a time, like signal
gizaticn of the associated signal devices a pre 70 sending means in each of said unattended of
determined interval of time after the connection
iices associated with said trouble checking lines
between said signal receiving means and the sig
respectively, each of said signal sending means
tion of the associated set of signal devices after
the connection between the signal receiving
means and the signal sending means of the cor
nal sending means of the corresponding unat
comprising a transformer, a plurality of sources
tended oiiice is terminated.
of alternating current each of a 'diiîerent fre
16. In a telephone system, an attended oiiice, 75 quency, a plurality of alarm relays each operated
2,413,001
»115
when 'a diiïerent trouble condition exists inthe
cnice in which the alarm relays‘are located and
means_including said relays for connecting one of
when no trouble exists in said unattended oiiìce
and for connecting the source of the Second fre
quency to said signal sending means when trouble
exists in said unattended office, said signal receiv
said sources to said transformer when no 'trouble
condition exists in the office and for connecting Ol ing means comprising two relays and filters for
selectively transmitting current of a different
another and diiîerent one of `said sources to said
one of said frequencies to each of said relays, a
transformer when each dilTerent trouble condition
gas-filled discharge lamp for operation when no
exists inthe oiiìce, means rsponsive to seizure of
said trouble checking line for completing a con
trouble exists in the unattended oiîice and a gas
nection from said line through isaid transformer 10 ñlled discharge lamp for operation when trouble
to one of said sources according to what if any
exists in the unattended office, means for con
trouble then exists in the oiìce, thereby to selec
necting said lamps to said signal receiving means
-tively transmit to said signal receiving means a
signal indicative of the condition existing in the
oiiice, said signal receiving means comprising a
plurality of relays one for each different signal
which may be transmitted from the signal send
ing means of a connected one of said trouble
thereby to effect the energization of one or the
other of said lamps according to Whether or not
trouble exists in the unattended ofñce, and means
current of a different one of said frequencies to
for maintaining the energization of either one of
said lamps for a predetermined interval after the
connection between said signal receiving means
and said trouble checking line is terminated.
21. In a telephone system, an attended office, a
each of said rela-ys, respectively, sets of signal
plurality of unattended oñices, each comprising
checking lines, ñlters for selectively transmitting
lines including a trouble checking line and
switches for seizing called lines, trunks between
said attended and each of said unattended oñices,
signal receiving means in said attended ofñce,
means including said trunks and switches for
connecting said signal receiving means to said
necting said devices to said signal receiving
means, thereby to effect the operation of the sig
trouble checking lines, one at a time, like signal
naldevice corresponding to the condition Vexisting
sending means in each of said unattended oñices
in the unattended oiiice to which the signal re 30 associated with said trouble checking lines re
spectively, each of said signal sending means
ceiving means is then connected.
-’19. In a telephone -»system,-an attended office,
comprising a transformer, a plurality of sources
of alternating current each of a different fre
an unattended oñice, a trunk between said ofñces
quency, a plurality of alarm relays each operated
for completing connections between calling and
called lines in said oñices, signal receiving means 35 when a different trouble condition exists in the
oiiîce in which the alarm relays are located and
in said attended omce, a trouble checking line in
means including said relays for connecting one
said unattended oiiice, means including said trunk
for connecting said signal receiving means to said
of said sources to said transformer when no
trouble checking line, signal sending means asso
trouble condition exists in the office and for con
ciated with said line comprising a source of cur 40 necting another and different one of said sources
rent of a first frequency and a source of current
to said transformer when each different trouble
of a second frequency, means comprising a trouble
condition exists in the oii'ice, means responsive
to seizure of said trouble checking line for com
alarm relay in said Vunattended oñîce for con
necting the source of the ñrst frequency to said
pleting a connection from said line through said
transformer to one of said sources according to
signal sending means when no trouble exists in
said unattended oñ'ìce and for connecting the
what if any trouble then exists in the oiiice, there
by to selectively transmit to said signal receiving
source of the second frequency to Said signal
means a signal indicative of the condition exist
sending means when trouble exists in said un
ing in the oiiîlce, said signal receiving means com
attended ofnce, said signal receiving means com
prising aplurality of relays one for each different
prising two relays and ñlters for selectively trans
signal which may be transmitted from the signal
mitting current of a different one of said fre
quencies to each of said relays, a gas-filled dis
sending means of a connected one of said trouble
checking lines, iilters for selectively transmitting
charge lamp for operation when no trouble exists
current of a different one of said frequencies
in the unattended oiñce and a gas-'ñlled discharge
lamp for operation when trouble exists in the 55 to each of said relays respectively, sets of gas
ñlled discharge lamps, one set for each of said
unattended oiñce, and'means 'for'connecting said
devices, one set for each of said unattended of
ñces and each set including a device for each
signal which may be received from the cor
responding unattended oiiîce, means individual
to each set of signal devices for operatively con-`
lamps to said signal'receiving'means thereby to
unattended oñ'ices and each set including a‘lamp
for each signal which may be received ,from the
corresponding unattended office, means individ
60 ual to each set of gas-filled discharge lamps for
in the unattended oi’rlce.
operatively connecting said lamps to said signal
20. In‘a telephone system, an »attendedoliica
receiving means, thereby to effect the energization
an unattended oiîicega trunk between'said offices
of the lamp corresponding to the condition exist
for completing connections `between ‘calling and
called lines in said oi’dces, signallreceiving means 65 ing in the unattended cnice to which the signal
receiving means is then connected.
in said attended ofñce, a trouble checking line in
22. In a telephone system, an attended oflicev
said unattended oiîice, means including said
Ya plurality of unattended oiiices, each comprising
trunk for connecting said signal >receiving means
lines including a trouble checking line and
to said trouble checking line„a signal sending
means associated with said line comprising a
70 switches for seizing called lines, trunks between
effect the energization of one -or theo'ther of said
lamps according to whether or not trouble exists
said attended and each of said unattended of
iices, signal receiving means in said attended of
ñce, means including said trunks and switches
for connecting said signal receiving means to said
attended oñice for ‘connecting fthe -source of the
first frequency to said `signal -‘sending .means 75 trouble checking lines, one at a time, like vsignal
source of current of a 'first ïfl‘eqllerlßy and a
source of Vcurrent of a lsecond frequency, .means
comprising a trouble alarm relay in said un
2,413,001
17
sending means in each of said unattended offices
associated with said trouble checking lines re~
spectively, each of said signal sending means com»
18
signal which may be transmitted from the signal
sending means of a connected one of said troulilcI
checking lines, ñlters for selectively transmitting
prising a transformer, a plurality of sources of
current of a diñerent one of said frequencies to
another and different one of said sources to said
receiving means, thereby to eifect the energiza
tion of the lamp corresponding to the condition
existing in the unattended office to which the
signal receiving means is then connected, and
alternating current each of a different frequency, Cl each of said relays respectively, sets of gas-ñlled
discharge lamps, one set for each of said un
a plurality of alarm relays each operated when
attended offices and each set including a lamp
a different trouble condition exists in the oñice in
for each signal which may be received from the
which the alarm relays are located and means in
corresponding unattended office, means individ
cluding said relays for connecting one of said
ual to each set of gas-ñlled discharge lamps for
sources to said transformer when no trouble
operatively connecting said lamps to said signal
condition exists in the oñice and for connecting
transformer when each different trouble condi
tion exists in the cnice, means responsive to seiz
ure of said trouble checking line for completing
a connection from said line through said trans
former to one of said sources according to what
if any trouble then exists in the oiñce, thereby
to selectively transmit to said signal receiving
means a signal indicative of the condition existing
in the cfñce, said signal receiving means compris
ing a plurality of relays one for each diiîerent
means individual to each set of lamps for main
taining the energization of any lamp in the set
for a predetermined interval after the connection
of said signal receiving means to the trouble
checking line in the corresponding unattended
office is ended.
HARRY H. SCHNECKLOTH.
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