close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2405339

код для вставки
Aug.' 6, i946.
M. P; WILLIS
2945,33
EQUIPMENT FOR OBSERVING DIAL TONE SPEED
Filed‘June 6, 1944
wf/
m\
n.,S
C
@E
E5@
lilies 7102i
Jus] 7M@
3\\|/lwmx-
C\
w,
w
J
m
„_Hï.
_m
M
w
„uw „m
ì?
0M
w
œ
ß
ÉÉÉÉF@FEEÈMÉHEÈÉ,
l/VIMW
.Minh
|l1/l/
IIlma
w il W„M.„gf
wn
a
S
BY
Jroïl
El,J)wmfLf.Lf
Tm»
Mmm
.smb
„WMM
.wbb_ M_.swMße.aiIli,,.
Àug. ,f 1946,
2,405,339
MP. wlLLls
EQUIPMENT FOR OBSERVING DIAL TONE SPEED
Filed June 6, 1944
2 Sheets-Sheet 2
[Ilr
C0. Switching „gp/v.
701
705
Line6 7 t0
To SR Relafys
of oi‘her S11/í alles
Jig. 2
INVENTOR
ATTORNEY
2,405,339
Patented Aug. 6, 1946
UNITED sTÀTss PATENT o'rrlcs
EQUIPMENT FOR, OBSERVING DIAL` TONE
SPEED
Y
.
-Milton Powell Willis, Dallas, Tex., assignor to
American Telephone and. Telegraph Company, ,
~
a corporation of New York
Application June 6, 1944, Serial No. 539,019
1'2 Claims.
(Cl. 179-1752)
2.
1
This invention relates to equipment for making
observations of certain operations of machine
ent service conditions, so that the diiîerence in
dial tone time between lines of'different groups
may be noted.
v switching systems, and'itv particularly relates to
In the system as/herein disclosed, the switch
making observations of the vtime required' for `a
dial tone to appear after a call has been initiated
which is used for service observing purposes is of
a type having six brushes and twenty-two point
banks for each brush. It will be understood,
upon a line.
In one type of machine switching systems, when
however, that other types of switches mayequally
a call is initiated by taking the receiver 'ofi the
well be used.
switchhook, certain automatic equipment is set
The invention maynow be more fully vunder
into operation to `connect the line to an idle'ñrst 10
stood from the following description, when read
selector. As soon 'as such iirst selector has been
in connection with the accompanying drawings,
seized, a dial tone is sent out over the' line to
in which Figure 1 illustrates the invention as ap
indicate to the‘subscriber that he may proceed to
plied to a system in which the lines-to be ob
'I‘he time“ required for the dial tone to appear 15 served are operated on either a »flat rate or mes
sage vrate basis; while Fig. 2 shows the system as
varies as between different lines in the same ex
applied to observed lines which are provided with
change and it also varies from time to time for
coin box equipment at the subscribers’ stations.
any given line. In the case of a given line, the
Referring-to Fig. l, aïswitch SW is shown hav
time required for the dial tone to appear will- de
pend upon a number'of factors. For example,»if 20 ing six wipers Wi to We, inclusive, each‘ arranged
lto operate overa bank having twenty-two points.
the group in which the line is located is operat
The brushes of the switch maybe rotated step by
ing under overload conditions a longer time will
step to establishv connections to the different
be required before a line ñnder or trunk selecto-r
points of the switch. When the switch is oper
will become available to extend the line to a first
selector. Another factor that may añect the dial 25 ated step by step, under the control of the service
observing operator as will be described later, the
tone time is the number `of lines in each group
operator’s,service-observing equipmentl may be
served by a given amount of appropriate switch
connected to successive lines to be tested, under
ing equipment. Likewise any change in the
conditions approximating> the initiation of a call
amount of switching equipmentavailable to all
the lines of such a group-will affect the time for 30 over each line. For this purpose the first twenty
one points of bank l are connected to the tip con
the dial tone to appear.
ductors of 21 lines and the corresponding points
As between lines in different groups the time
in bank 2 are connected to the ring conductors of
required for the ydial tone to appear `will on the
said lines. A busy tone is connected to» the
average be affected by (a) the number of -lines in
twenty-second point yof bank l. This informs the
each group, (bi) the amount of equipment avail
operator that the switch isvin its stand-by posi
able to serve a particular group, and (c) the load
tion ready to test all of the lines connected to
on the lines of each group. Any one or all of
banks l and 2.
the foregoing factors may, of course, vary from
dial.
group to group.
`
'
In a similar manner the tip conductors of an
other group of twenty-onev lines (herein num
,
Due to these and other conditions it is desir
v“able to have means available to make observations
ofthe time required for the`dial tone to appear
bered 22 to 42, inclusive) are connected to ythe
first twenty-one points of bank 3, the correspond
ing tip conductors being connected to the first
twenty-one points of bank 4. Likewise the tip
and ring conductors, respectively, of'li'nes num
0n each of a number of lines selected as samples
for observation. In accordance with the present
invention the lines selected for >sampling purposes
are connected to contacts of a rotary switch,
which may be used by the service observing oper
ator to connect her equipment to the lines one at
a time, under conditions simulatingv the condi
tions of a call. As connections are thus succes
bered 43 to 63 are connected to the first twenty
onev points of banks 5 and 6, respectively. Busy
tones'are applied to points 22 of banks'3 and 5
to indicate to the >operator that the switch is in
50 its waiting position ready to test the linescon
sively established to the lines the - service ob
nected to those banks. After all of the lines con
server may note the time required before’th‘e dial
tone appears for each line. If desired, the lines
taken for sampling .may be more or less uniformly
nected to a pair of banks have been'test‘ed, the
busy will -be heard on kthe next step -to indicate
chosen from groups which `are subject lto diner 55
that the switch is again in its Astand-'by position.
The conductors vI’IJI and 102, leading'towipers
v2,405,339
3
4
W1 and W2 of the switch SW, are connected over
condition to be dialed. The operator then uses
her dial ÁOD to dial the code of the trunk TL1.
In response to this dialing -operation the ñnal
selector FS connects the operator’s line OL to
the terminals of the trunk TL1, thus operating
trunk TL1 and through tip and ring terminals of
an intermediate frame IDF to tip and ring con
tacts of a ñnal selector FS. The final selector
FS is normally employed in the exchange for
establishingconnections from line to line, but
certain of its terminal points are for purposes of
the present invention assigned to trunks such
the relay BB1. As soon as the ñnal selector FS
makes connection with the trunk TL1 a busy tone
is transmitted over point 22 of bank | of the
as TL1. Other terminal points are similarly as-v
switch SW, over conductor |0I, through a con
signed to other testing trunks such as TLz and 10 denser and over the tip conductor of the trunk
TL3.
TL1 and the operator’s line OL to the operator’s
When the service observing operator wishes to
set OS. This informs the operator that each of
the wipers of the switch SW is resting upon the
connect her set OS to any of the lines I to 2|, in
twenty-second point of the corresponding switch
clusive, for testing purposes, the receiveris re
moved from the hook of the set and this causes a
bank. At the saine time the connection above de
line ñnder LF or other suitable mechanism (here
scribed was established over the trunk TL1 a con
in indicated symbolically) to establish connec
/nection is completed from the sleeve circuit of
tion between the operator’s set and the iirst lse
vthe central oiiice switching equipment CS, over
lector of the central o_iiice switching apparatus
the common sleeve conductor SC, and through the.`
CS.» The operator then dials by means of the 20 winding of the relay vSR. to battery B, thus enel*
gizing the relay SR.
'
Y.' j ’
oflice dial OD the special number assigned Vtrunk
TL1, thus completing a connection through the
The operator, upon hearing the busy tone above
central oñice switching apparatus CS and the ii
described,` closes the key K momentarily, thus
establishing a circuit from ground, over the upper
nal> selector FS to the tip and ring terminals of the
contacts of said key, over conductor H0, over the
trunk TL1.
now .closed contact of relay SR., and through the
`lîf access »to trunk TLz 4is desired the operator
winding of relay ST to battery B. Relay ST upon
may, by dialing a diiîerent code, connect her set
being energized closes a circuit from ground over
to the tip and ring terminals in the iinal selector
its contact to energize thestepping magnet SM.
FS which are connected to the trunk TLz. As this
trunk Vis associated with conductors |03 and |04 30 As soon as the key K is restored, relay ST is're
leading to wipers W3 and W4, access is thus given
leased, thus opening the circuit of the stepping
to lines 22 to 42 for testing purposes. By dialing
magnet SM which advances the six wipers ‘of the
switch SW to the ñrst point in each of the switch
a still different code the trunk TLs may be
banks.
reached and this trunk is associated through con
A connection is now established for the iirst
ductors |05 and |06 with the banks 5 and 6
line to be tested from the tip conductor of said
through which subscribers’ linesV 43 to 63, inclu
line I, over wiper W1, conductor |0|, over the
sive, are reached.l
,The trunks TL1, TLzY and TLa have associated
closed contact of relay BR1, over conductor |02,
through a tLOU-ohm resistance, and thence over
with them relays BB1, BRz and BRS, respectively.
The armature of relay BR1 closes a connection be 40 wiper W2 to the ring conductor of line |. This
completes the circuit of line I, thus causing the
tween conductors |0| and |02 through a 40G-ohm
line ñnder or other switching equipment (not
resistance to the wipers W1 and W2. Consequent
shown) of the central ofñce to establish a connec
ly, when these wipers rest upon the points asso
tion from the 1ine | to a ñrst selector. When the
ciatedwith one of the lines to be tested, the cir
cuitof that line is closed in a manner similar to 45 connection to the ñrst selector is established, the
usual dial tone is transmitted over the tip conduc
that occurring when a subscriber takes the re
tor of line l and thence to the operator’s set OS
ceiver ofi the switchhook. In a similar manner
over the circuit previously traced for the busy
relay BR2 closes the circuit of conductors |03 and
|04 and the relay BR?. closes the circuits of con 50 tone from point 22 of switch bank |,. The opera
tor notes the time elapsing from the moment the
ductors |05 and |06 through 400-ohm resistances.
key K is released to the moment when the busy
vThe sleeve terminals of the intermediate dis
tone is heard, and thereby knows the time re
tributing frame lDF, which are associated with
quiredfor a subscriber initiating a call on `that
the trunks TL1, TLz and TLS, are strapped to
,
f
V
gether so that when the final selector FS estab 55 line to hear the dial tone.
In a similar manner the operator, by again
lishes a connection to any one of these trunks, a
depressing the key, will operate the stepping mag
circuit is completed over a common sleeve conduc
net SM to advance each wiper of'the switch SW
tor SC to operate a relay SR which controls the
to the second point of each bank. Thereupon the
circuit of a relay ST. The operator is also pro
time elapsing before the dialtone is heard'may
vided with a key K which, if closed when the relay 60 be noted for line No. 2. As soon as >the operator
SR is operated, will complete a circuit through
notes down the elapsed time for line No. 2, the op
the relay ST, which in turn controls the opera
erator
in a similar manner advances the wipers
tion of a stepping magnet SM for the switch SW.
of the switch SW1 over successive points of the
Further details of the `apparatus will be clear
banks until all of the lines | to 2 |, inclusive, have
from a description of the operation. Let us >as 65 been tested. After line 2| has been tested the
sume that the switch SW is insuch -position'that
next operation of the key .K advances theA wipers
each of its six wipers ,is resting upon the twenty
of the switch to the twenty-second point of each
second point in the corresponding bank of the
bank, _and the operator again hears the busy `tone
switch. The operator through herset closes the
coming in over point 22 of bank |. This apprises
OperatOr’S line 0L, thus causing the line finder, 70 the operator that the ñrst set of twenty-one lines
or >other switching apparatus, to connect the line
has been tested.
ï
Ä ,
OL to the first selector of the central oñ‘ìce switch
` The operator now releases the connection to
ing apparatus CS. As soon as the connection to
trunk¿’IL1 and dials the code number by which
.the first selector is established the operator will - .
the _trunk TL2 may be reachedï _Relay-BR1 vis. re
hear a dial tone indicating that the circuit is in 75 leased as soon as the- brushes of the Íinal'selector
¿messe
5
6
FS -leave the terminals of the trunk T111. When
ofßbanks a .and >5,1 while the».points-fontamara@
said brushes of a nnal selector in response to the
dialed code establish contact with the terminals of
the trunk TLz the relay BH2 is energized, and re
lay SR1 is operated over the sleeve terminal of the
trunk TLz at the iinal selector FS. The operator
now hears a busy tone over the twentyesecond
point of bank 3, over conductor 103, through the
sistancefto- theßring'conductor-s of these# lines 'to
operate: thel coinr‘bo‘x> trunk. relay equipment.
Otherwise,l the apparatus ïi‘s lsimilar to that of
Figi.
I'n-«testing-the lines thecoperator proceeds as
inV the- case of Fig. 1, first` dialing .to Aestablish a
connection' to ytrunk TLi, thusoperating‘ the ..re-/
condenser associated with the relay BRz, over the
tip conductor of the trunk TLz, and thence over
the circuit previously traced to the operator’s
set OS.
busy ’tonerfrom the twenty-secondpoint of bank
I,ï the operator momentarily closes the key-.K >to
The operator again actuates the key K, stepping
operate-'the relay ST, which in »turn'operates' the
lay vBB1-andthe relay SR. Upon hearing the
stepping magnet to advance the switch- to theiirst
the wipers of the switch SW to the second point
of eachV of the banks. A circuit is thus completed 15 point’in each> bank. As before,a line circuit clos
ing connection is established from the‘tip. of line
over _ the operating contact of the relay- BH2
through a' 40C-ohm resistance, and thence over
the wipers ~W3 and` W4 to the tip and ring con
I, over-ithe» wiper/W1, conductor IIìI, operating
Contact oiîïrel'ay BRi, conductor |62, through the
40G-ohm resistance; and over wiper W2 to the >ring
ductors of’line 22. After the operator notes the
dial tone coming in over line 22, the key K is 20 conductor of. line I.'
again actuated to advance the switch to the next
Howevenlthis operation alone does not `com
plete the 1 line circuit, for the coin 'box trunk
line, andso on, until the dial tone time of each
relay equipment must also be operated before the
of the lines 22 to'42 has been determined.
Thev next operation of the key K` advances the
line can be~extendedfto any switching equip
wipers of the switch again to the twenty-second 25 ment. This isdoneby means of the third bank
point so that the operator once more hears the
of the switch, a ground rconnection being estab
busy tone. The operator now releases and then
lished throughtheBOOà'ohm resistance, over wiper
dials the code for trunk TLa, thus establishing
Wa and the iirst point’ of bank v3 `of the ring con
connection to wipers W5 and We of the switch
ductor ofrline ÃI. Theclosing of this circuit and
SW. Upon hearing the busy tone from the 30 the simultaneous closing of the circuit over the
twenty-second point of bank 5, the operator then
ñ'rst points 'of banks vI and 2 simulate the condi
actuates the key K to step the switch SW step
tions'underwhichf a vcall .is kinitiated onl a coin
by step until all of the lines 43 to 63 have been
contròlledïlinei As soon as the first selector has
been reached, the operator will hear the dial tone
tested.
The foregoing operations may be repeated from 35 from the ¿line I as described in connectionV with
time'to time to test the dial tone times of the
Fig. `l. The foperatorthen 'successively tests the
various lines at different times of day and under
other lines byîsteppingfthe switch point by point
different conditions of load. From the observa
by means of the operator’s key K, as described in
tions thus made information may be tabulated to
connection with Fig. `1.
inform those concerned of the operating condi 40
The' operator having tested lines I to 2l, in
tions in the exchange so far as the waiting time
clusive, will release the connection previously
for >dial tones is concerned. ' As already stated,
dialed and 1511611 dial the trunk T112. After con
the lines chosen for test purposes and connected
nection to the trunk> has `been established, the
to the various points of the switch SW may be
operator proceeds in asimilar manner to test
representative of 'different groups, if desired, so 45 lines 22 lto 42.
that information may be had as to the dial tone
Whiler this invention has been ldisclosed in cer
time for representative’ lines under different
tain specific arrangements which are deemedfde
service conditions. Also comparisons may be
sirable, it will be obvious that the general prin
made between individual lines of the same group,
ciples herein set forth may be embodied in many
or between lines of any group and those of any 50 other'organizations, widely different from those
other group.
illustrated, without ‘departing from the spirit of
The arrangement of Fig. lis that preferably
the invention as defined in the‘appended claims.
employed 'when the lines to be tested are either
What is claimed is:v
flat rate lines or message rate lines; Where, how- ,
1. A- system for observing the time between
ever, coin box lines are to be tested, ‘a somewhat 65 theinitiation ofl a calll over a telephone line and
'different arrangement, such as that illustrated in
Fig. 2, is employed.
the appearance of a dial tone, saidV system in
cluding a step by step switch to thevcontacts of
Since circuits over coin ’box lines cannot be
completed until a coin has been dropped in a coin
which lines to be tested are connected, a trunk
leading to- said switch, means including iinal
box to operate the coin box trunk relay equipment, 00 selectors for selecting-‘for communication pur
arrangements must be vprovided for simulating
poses any desired line in'resp'on'se to the dialed
the conditions resulting from the dropping of the
number'as'signed’to said -line andv for selecting
coin. Therefore, in the arrangement of Fig. 2,
said trunk and connecting an operator’s observ
while the points 1 to 21, inclusive, of banks I and
ing set thereto in response to a di‘aled'number asn
_ 2 are connected to the tip and ring conductors of 65 signed to said trunk, means whereby said trunk
' the lines as before, the points of bank 3 are ar
when selected is conditioned to simulate the fin
ranged to establish a connection through an 800
ohm resistance over the wiper W3 to the ring con
itiation of 'a call, andmean’s-controlled by the
operator' to send a single pulse over said trunk
ductors of each of the lines, to operate the coin
box trunk relay equipment. Since three banks
to step said switch from: line to line to succes
sively initiate simulated calls over Asaid lines
are therefore used for each service observing
without changing the setting ofany iinal selector,
whereby the time requirement for vthe dial tone
trunk, only two trunks, TL1 and TLz with their
to appear maybe ¿observed for each line con
associated relays BB1 and BRz, are provided. The
nected to saidste'p-byestep switch.
. Y
tip- and ring Aconductors of lines 22 to 42, inclu
sive, are' in this instance’connected‘to lthe »points 75
2,405,339
8
7
5. A system for observing the time between the
the initiation of a call over a telephone line and
initiation of a call over a telephone line and the
the appearance of a dial tone, said system in
appearance of a dial tone, said system including
cluding a> step by step switch >to the contacts-of
a step by step switch having a plurality of banks
which lines to be tested are connected, a trunk
leading to said switch, means including iinal CII of contacts, tip conductors of lines to be tested
connected to the contacts of one bank of said
selectors for selecting for communication pur
switch and the ring conductors of said lines being
poses any desired line in response to the dialed
connected to the corresponding contacts of an
number assigned to said lineA and for selecting
other bank, a trunk having tip and ring con
said trunk and connecting an operator’s ob
ductors leading to the respective wipers asso
serving set thereto in response to a dialed num
ciated with bank having tip and ring conductors
ber assigned to said trunk, means whereby said
of lines connected thereto, means including ñnal
trunk when selected is conditioned to simulate
selectors for selecting for communication pur
the initiation of a call, means controlled by the
poses any desired line in response to the dialed
operator to send a single pulse over said trunk
number assigned to said line and for selecting
to step said switch from line to line to succes
said trunk and connecting an operator’s observ
sively initiate simulated calls over said lines
ing set thereto in response to a dialed number
without changing the setting of any final selector,
assigned to said trunk, means whereby when said
whereby the time required for the dial tone to
trunk is selected its tip and ring conductors are
appear may be observed for each line connected
to said step-by-step switch, and means to trans 20 connected through a resistance to simulate the in
mit a ' special signal to the „ operator when> a
group of the lines connected tothe switch have
been tested.
`
‘
A
ç
'
Y
-
j
3. A system for observing the time Vbetween
the initiation of a call over a telephone line and
the appearance of a dial tone, said system ,inf
cluding a step by step switch'to the contacts
of which lines to be tested are connected, a trunk
leading to said switch, means . including :final
itiation of a call, and means controlled by the
operator to send` a single pulse over said trunk
to step said switch from line to line to cause said
trunk to successively simulate the initiation of
calls over said lines without changing the setting
of any final selector, whereby the time required
for the dial tone to appear may be observed for
each line connected to said step-by-step switch.
6. A system for observing the time between the
selectors for selecting for communication pur-> 30 initiation of a call over a telephone line and the
appearance of a dial tone, said system including
poses any desired line in_response ,to ,the dialed
a step by step switch having a plurality of banks
number assigned to said line: and ior‘selecting
of contacts, tip conductors of lines to be tested
said trunk and connecting an operator-’s observ
connected to the contacts of one bank of said
ing set thereto in response to a‘dialed number
switch and the ring conductors ofsaid lines being
assigned to said trunk, means whereby said trunk
connected to the corresponding contacts of an
when selected is conditioned to simulate thein
other bank, a trunk having tip and ring con
itiation of a call, vmeans controlled by. the oper
ductors leading to the respective wipers asso
ator to send a single pulse over said trunk -to
ciated with banks having tip and ring conductors
step said switch from line to -iine `to successively
initiate simulated calls over said lines without 40 of lines connected thereto, means including final
selectors for selecting for communication pur
changing the setting of any ñnalV selector, _where
poses any desired line in response to the dialed
by the time required for the dial tone' to appear
number assigned to said line and for selecting said
may be observed foreach line connectedtosaid
trunk and connecting an operator’s observing set
step-by-step switch,` and means associated with
said switch acting when the line is selected for 45 thereto in response to a dialed number assigned
to said trunk, means whereby when said trunk
observation to produce a condition to voperate the
coin box trunk relay equipment associated with
the line.
‘
'
Y
'
.-
Y
4. A system for observing the time between
the initiation of a `call over a telephone line vand
the appearance ,of‘ a dial tone, said ,system in
cluding a step :by step switch to thecontacts- of
which lines to be tested are g connected,V a vtrunk
leading to said switch, means including iinal
selectors for selecting for communication pur
poses any desired line in response tothe dialed
number assigned to said line and for selecting
is selected its tip and ring conductors are con
nected through a resistance to simulate the in
itiation of a call, means controlled by the op
erator to send a single pulse over said trunk to
step said switch from line to line to cause said
trunk to successively simulate the initiation of
cails over said lines without changing the setting
of any ñnal selector, whereby the time required
for the dial tone to appear may be observed for
each line connected to said step-by-step switch.
and means to transmit a special signal to the op
erator when a group of the lines connected tothe
switch have been tested.
ing set thereto in responsexto a >dialed number
'7. A system for observing the time between the
60
assigned to said trunk, means whereby said trunk
initiation of a call over a telephone line and the
when selected is conditioned to simulate the in
appearance of a dial tone, said system including a
said trunk and connecting the operator’s observ
itiation oi’ a call, means'controlled by the Voper
ator to send a single pulse over said trunkjto
step said switch from line to line to succes
sively initiate simulated calls over` said lines with
out changing the setting of »any ñnalvselector,
Awhereby lthe time requiredv for the dial tone to
appear may be observed'for eachrline connected
to said step-by-step switch, Y meansA associated
with said switch acting when the line is `selected
for observation to` produce a conditionto operate
the coin box trunkl relay equipment associated
with the line, and means to transmit; a Yspecial
signal to the operator when a group; of the> lines
connected to the 'switchhavezbeentested;
step by step switch having a plurality of banks
of contacts, tip conductors of lines to be tested
connected to the contacts of one bank of said
switch and the ring conductors of said lines being
connected to the corresponding contacts of an
other bank, a trunk having tip and ring con
ductors leading to the respective wipers asso
ciated with banks having tip and ring conductors
of lines connected thereto, means including final
selectors for selecting for communication pur
poses any desired line in response to the dialed
number assigned to said line and for selecting
75 said trunk and connecting an operator’s observing
»2,495,339
_19
sistanceto simulate the initiation of a call, and
means controlled by the operator to -send a single
pulse over said trunk to step said switch'from
line to line of the pair of banks corresponding to
the selected trunk to successively simulate the
initiation .of a Acall,‘means controlled by the op
initiation of calls over said lines without chang
erator to send a single pulse over said trunk to
ing the setting of any final selector, wherebi7 the
step said switch from line to line to cause said
time’required for the dial tone to appear may be
t-runk to successively simulate the initiation of
observed for each line connected to said step-by
calls over said lines‘without changing the setting
of any íinal selector, whereby the time required 10 step switch.
10. A system for observing the time‘between the
for the >dial tone to appear maybe observed for
initiation of a call over a »telephone‘line and the
each line connected _tosaid step-by-step switch,
appearance of a dial tone,'said system including
and means, associated with said’switch acting
a step by step'switch having a plurality of con
when the line is selected for observation to pro
duce a-condition to operate the coin box trunk 15 tacts, a plurality of lines to be tested, the tip con
ductors of certain of said lines being connected to
relay equipment associated‘with the line.
the contacts of >one bank of said switch and the
8. A system for observing the time between the
corresponding ring conductors-of said lines being
initiation of a call over a'telephone line and the
similarly connected to the contacts of another
»appearance of a dialtone; said system including
a step by step switch‘having a plurality of banks 20 bank, the'tip and ring conductors of other of the
lines to be tested being similarly connected to
of contacts, tip conductors of lines to be tested
other banks of said switch, trunks having tip and
connected to the contacts of one bank of said
ring conductors leading vto the respective wipers
switch and the ring conductors of said lines being
associated with pairs of banks having tip and ring
connected to the corresponding contacts of an
other’bank, 4aA trunk having tip and ring con 25 conductors connected thereto, there being a trunk
for each pair of banks having tip and ring con~
Yductorsleading to the respective wipers associated
ductors of lines connected thereto, means includ
with banksv havingV tip andv ring conductors of
ing final selectors Vfor selecting for communication
lines connected thereto, means including ñnal se
purposes any. desired line in response to the dialed
lectors for selectinglfor communication purposes
any desired line in response to the dialed number 30 number assigned to said line and for selecting any
one of said trunks and connecting an operator’s
assigned to said line and for selecting said trunk
observing set thereto in response to a dialed
and connecting an operator’s observing set there
number assigned to said trunk, means whereby
to in response to a dialed number assigned to said
when a trunk is selected its tip and ring con
trunk, means whereby when said trunk is selected
its tip and ring conductors are connected through 35 ductors are connected through a resistance to
simulate the initiation of a call, means controlled
a resistance to simulate the initiation of a call,
set thereto in _response to a dialed .number as
signed tosaid trunk; means whereby when said
-trunk -is selected vits tip and ring conductors are
connected throughfa resistance to simulate the
by the operator to send a single pulse over said
trunk to step said switch from line to line of the
pair of banks corresponding to the selected trunk
to successively simulate the initiation of calls
over said lines without changing the setting of
changing the setting of any iinal selector, where
any iinal selector, whereby the time required for
by the time required for the dial tone to appear
the dial tone to appear may be observed for each
may be observed for each line connected to said
line connected to said step-by-step switch, and
step-by-step switch, means associated with said
switch acting when the line is selected for obser 45 means to transmit a special signal to the operator
means controlled by the operator to send a single
pulse over said trunk to step said switch from line
to line to cause said trunk to successively simulate
the initiation of calls over said lines without 40
vation to produce a condition to operate the coin
when a group of lines connected to a pair of banks
of the switch have been tested, whereupon the op
erator may select another trunk to similarly test
line, and means to transmit a special signal to
a group of lines connected to another pair of
the operator when a group of the lines connected
50 banks of said step-by-step switch.
to the switch have been tested.
11. A system for observing the time between the
9. A system for observing the time between the
initiation of a call over a telephone line and the
initiation of a call over a telephone line and the
appearance of a dial tone, said system including a
appearance of a dial tone, said system including
step by step switch having a plurality of con
a step by step switch having a plurality of con
tacts, a plurality of lines to be tested, the tip con 55 tacts, a plurality of lines to be tested, the tip con
ductors of certain of said lines being connected
ductors of certain of said lines being connected
to the contacts of one bank of said switch and
to the contacts of one bank of said switch and
the corresponding ring conductors of said lines
the corresponding ring conductors of said lines
being similarly connected to the contacts of an
being similarly connected to the contacts of an
box trunk relay equipment associated with each
other bank, the tip and ring conductors of other 60 other bank, the tip and ring conductors of other
of the lines to be tested being similarly connected
of the lines to be tested being similarly connected
to
other banks of said switch, trunks having tip
to other banks of said switch, trunks having tip
and ring conductors leading to the respective
and ring conductors leading to the respective
wipersv associated with pairs of banks having tip
wipers associated- with pairs of banks having tip
and ring conductors connected thereto, there be
and ring conductors connected thereto, there
ing a trunk for each pair of banks having tip and
being a trunk for each pair of banks having tip
ring conductors of lines connected thereto, means
and ring conductors of lines connected thereto,
including iinal selectors for selecting for com
means including iinal selectors for selecting for
communication purposes any desired line in re
sponse to the dialed number assigned to said line
and for selecting any one of said trunks and con
necting an operator’s observing set thereto in re~
sponse to a dialed number assigned to said trunk,
means whereby when a trunk is selected its tip
and ring conductors are connected through a re 75
munication purposes any desired line in response
to the dialed number assigned to said line and for
selecting any one of said trunks and connecting
an operator’s observing set thereto in response
to a dialed number assigned to said trunk, means
whereby when a trunk is selected its tip and ring
conductors are connected through a resistance to
andasse
11
Y12
simulate the initiation of a cal_l,_means cóntrolled
by the operator to sen@~ Aa _single pulse over said
trunk to step said switch from line to' line of the
pair of banks corresponding to the selected trunk
to successively simulate the initiation of callsover
said lines without changing the setting of any
ñnal selector, whereby the time required for the
dial tone to appear may be observed for each line
connected to said step-by-step switch, and means
associated with said switch acting when the line
is selected for observation to produce a condition
to operate the coin box trunk relay equipment
ductors of lines connected thereto, means includ- `
ing iinal selectors for selecting _for communication
associated with each line. Y
purposes any desired line in response to the Vdialed
number assigned to said line and lfor selecting
any one of said trunksand connecting an op
erator’s observing set thereto in response to a
Vdialed number assigned to said trunk, means
_ whereby when a trunk is selected its tip and ring
conductors are connected through a resistance to
simulate the initiation of a call, means controlled
by the operator to ‘send a single pulse over >said
trunk to step said switch from line to line ofthe
pair of banks corresponding to the selected trunks
_
12. A system for observing the time between the
to successively simulate the initiation of calls 'over
initiation of a call over a telephone line and the
said lines without changing thefsetting of vany
ñnal selector, whereby the time required for the
dial tone to appear may be observed for each
appearance of adial tone, said system including
a step by step switch having a plurality of con
tacts, a plurality of lines to be tested, the tip ecn
ductors of certain’of said lines being connected to
line connected to said step-by-step switch, means
associated with said switch'acting when the line
the contacts of one bank .of` said switch and the
20 is selected ‘for observation to produce a condition
similarlyA connected yto the contacts of another
sociated'with each line, and means to transmit a
bank, the tip and'ring conductors of other of the
special signal to the operator -when a group of
lines connected to a pair of banks of the switch
corresponding ring conductors of said lines being
to operate the coin box trunk relay equipment as
lines- to 'betested ` being similarly connected to
other banks of said switch, 'trunks having tip and
ring ‘conductors leading> to the respective Wipers
25
have been tested, whereupon the'op‘erat'or may
associated with pairs of banks havingtip and ring "
select another trunk to similarly test a'group of
lines connected to another pair of banks -of 'said
conductors connected thereto, there being a trunk
step -by-step switch.
for eachv pair of banks having tip and ring- con
'
'
'
'
M'JLTON POWELL lWII.J.¿[S.
'
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 135 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа