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Патент USA US3065316

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Nov. 20, 1962
Filed July 18, 1958
2 Sheets-Sheet 1
Nov; 20, 1962
Filed July 18, 1958
2 Sheets-Sheet 2
F IG. 2
CM 005 MON/N
United States Patent Office
Patented Nov. 20, 1962
or units relays, so that when the relay associated with
the transistor is energized or is operative, the transistor is
Pierre Burstow, Paris, and Claude Monin, Vilienness
(Seine), France, assignors to Coinpagnie lndnstrielie
ties Telephones, Paris, France, a corporation of France
Filed .luiy 18, 1958, Ser. No. 749,522.
Claims priority, application France
5, 1957
3 Claims. (@131. 179-18)
The present invention relates to an electronic marking
device applicable notably to telecommunications.
It is known that for stopping a rotary switch com
prising wipers exploring a variable number of contacts
disposed at regular intervals along an arc of a circle, it
is sufficient to “mark” by means of a given potential
the contact at which the switch is to stop. The passage
of the wipers over the marked contact closes a circuit,
the effect of which is ‘to stop the rotation precisely at
the marked level. The marking proper has consisted in
non-conductive, the effect of which is to change the
polarity to which one end of the winding of the ringing
relay was connected and thus to permit the passage of
the current through the winding of the said ringing relay,
provided that the relay of the other coordinate (units
or tens) has pulled up.
When it is desired to establish a communication through
one and the same automatic switch between a calling sub
10 scriber and a free called subscriber, the current flowing
through a winding of the called subscriber’s relay, as
stated, is su?icient to operate the said relay, but in other
cases a strong current is required to operate the said
relay. This is the case, for example, in devices for direct
connection to the network. Such devices are known, in
which the dialling of a conventional digit produces a
search for a free network line and its connection to the
calling subscriber. The marking is therefore effected at
the subscriber himself. The latter, who is engaged by
with the digit dialled by the calling subscriber, and the 20 reason of the fact that he has removed his receiver, thus
has ?owing through one winding of his ringing relay
consecutive rotation of the wipers constitutes a desired
designating one of a plurality of contacts in accordance
setting to the digit received, that is to say, a selection.
Thus, a plurality of successive settings permits of deter
a current which polarises it in the opposite sense to its
operation. It is therefore necessary in this case to cause
a stronger current to how through the winding of the
mining, digit-by-digit, one of a very large number of
lines, the marking and selecting of a digit taking place 25 calling subscriber’s ringing relay than in the normal case
of the marking of the called subscriber.
before the following digit is dealt with.
‘This object is achieved by a device provided into
Another form of making and selection is known,
association with the invention, which is set in operation
which permits of separating the two functions. In this
case, the marking does not take place digit~by-digit, but 30 only when certain conditions are ful?lled.
directly at the called subscriber in accordance with the
digits dialled by the calling subscriber and received in
According to the invention, the current fed in the
normal case of the marking of the called subscriber flows
through two equal resistances in series with the winding
a device called a register, the selection thereafter taking
of the ringing relay to be controlled and with a recti?er.
place. The principle may be as follows: all the lines,
for example 100, are assembled in the form of a matrix, 35 It is therefore sufficient to short-circuit one of the re
sistances by appropriate means when the strong marking
each horizontal row corresponding to a ten and each
current is required.
vertical column to a unit. Thus, the coordinates of any
According to the invention, these means consist in the
line taken in the matrix correspond to a certain ten and
a certain unit.
This line may ‘be determined as soon
as its number has been received by a register. It is
therefore possible thereafter to mark, one of a large
number of lines and to establish the path between the
connecting'circuit (to which the calling subscriber is al
ready connected) and the line only if the latter is free.
In this form, the selection takes place subsequently to
the marking and through a plurality of selection stages
depending upon the complete number marked and not,
association of two transistors with a magnetostatic re
lay. The latter is operated only if the special conditions
of a strong marking current are ful?lled.
In this case,
the ?rst transistor is rendered non-conductive by the
operation of the magnetostatic relay and the second
transistor is rendered conductive.
If a resistance is con
nected between the emitter and the collector of the said
second transistor, this resistance is substantially short
circuited when the second transistor is conductive and
the marking current increases considerably.
Further features and advantages of the invention will
The very rapid electronic switching systems lend thern~ 50 be apparent from the description hereinafter given with
reference to the ?gures of the accompanying drawings
selves particularly well to this latter form of marking and
which show by way of example constructional forms of
a l00-point matrix comprising 10 tens and 10 units.
The object of the invention is to provide an electronic
FIGURE 1 illustrates diagrammatically the general
marker in which no conventional electromechanical
arrangement of the matrix.
member having movable contacts is employed, but which
FIGURE 2 illustrates diagrammatically the marking
employs only static members, more especially magneto
matrix according to the invention in the case of a normal
static relays as de?ned by applicants in the French Patent
marking current.
1,160,506, for which the application was ?led on Novem
FIGURE 3 illustrates diagrammatically a special de—
ber 9, 1956, for “Magnetostatic Relay,” the correspond
vice according to the invention, by which the marking
ing United States application having matured as Patent
as before, stage-by'stage, with each stage corresponding
to one digit of the number.
current can be increased in some cases.
According to the invention, some or all of the sub
scribers are disposed on a matrix comprising horizontal
conductors D1,D2, . . . BSD‘, and of ten vertical con
conductors and vertical conductors, there being associ—
ductors U1,U2, . . . U9,U0 forming 100 crossing points.
In FIGURE 1, the matrix is composed of ten horizontal
ated with each horizontal conductor, for example, a tens 65 At each crossing, for example between the bar D2 and
the bar U1, a connection point is formed by connection
relay and with each vertical conductor a units relay.
of the point A21 of the horizontal conductor to the point
There is established at each crossing point between a
B21 of the vertical conductor through a recti?er Rdzl and
horizontal conductor and a vertical conductor a link
a winding e21 of the ringing relay whose line number
comprising a recti?er in series with one winding of the
ringing relay, the number of which is that of the co 70 corresponds to the number of the connecting point. A
horizontal bar D2 can be brought to a certain polarity
ordinates of the crossing point.
through a switching device such as H2 and a vertical bar
A transistor is associated with one of the two tens
can be brought to the opposite polarity through a switch
intermediate tens relays of the register and the switching
tor 1 are energised and operate, the points T2 and Q1
assume a positive potential. The transistor TMUl is
rendered non-conductive and the point N1 no longer has
its ground potential, and assumes a negative potential
—~Uc through the resistance rUl. Since the resistance
RD2 is high in relation to rD2 and the resistance rU1 is
devices V1,V2, . . . V9,V0 are associated each with one
of the same order as rD2 or equal thereto, the current
of the intermediate units relays. When a calling sub
scriber has dialled a called subscriber’s number, the in
termediate tens and units relays of this called subscriber
pull up and a connection, such as that of H2V1 through
part through the resistance rD2, the recti?er Rd21 the
winging e21 and the resistance rUl. The ringing relay
which has current flowing through its winding e21 pulls
ing device V1 and a resistance R1. The connecting point
is established when a current ?ows between H2 and V1
through the connection AZIBZI. The switching devices
Ell-I2, . . . H9,H0 are associated each with one of the
AmBzl, is consequently established.
‘In FIGURE 2, only the tens conductors D1,D2, . . .
and D0 and the units conductors U1,U2, . . . and U0 are
The constitution of the switching devices
H1,H2, . . . HO and V1,V2, . . . V0 Of
shown in this ?gure.
Connected to each horizontal conductor such as D2 of
the marking matrix according to the invention as illus
trated in FIGURE 2 is the output conductor of an inter
mediate magnetostatic relay for the recording of a ?rst
digit, the said relay consisting of a saturable magnetic
circuit D12 connected in series with a recti?er rd and a
transistor TD2, the emitter of which is connected to the
recti?er rd and the base of which is connected to a volt
age source -—-UR, the emitter of the transistor TD2 being
connected to a voltage source ——U0 through a resistance 2'.
Connected to the collector of the transistor TD2 is a re
of the collector of the transistor TD2 flows for the greater
up: the called subscriber is thus marked.
It is to be noted that if only one of the two intermedi
ate relays is energised no current ?ows through the wind
ing e21, because if only the tens relay, for example Dzz,
is energised the points M2 and N1 are at a positive poten
tial and nothing passes through e21, while if only the
intermediate units relay, for example Unl, is energised
the transistor TMU1 is rendered non-conductive and the
circuit consisting of RDZ and Rdzl, @121 and rUl is looped
on itself without including any electromotive force.
Therefore, no current can flow therethrough.
In FIGURE 2 it is seen that each of the magnetostatic
relays connected to a respective horizontal conducting
bar is provided with an output circuit means including the
resistance rD and resistance RD leading to the connect
ing link in which the subscribed relay e is located. Simi
larly, the output circuits of each of the ma gnetostatic relays
associated with the respective vertical conducting bars in
sistance rD2, the other end M2 of which is connected on
the one hand to the point A21 and on the other hand to a 30 clude output means comprising the blocking transistor
voltage source —Uc through a resistance RD2, the value
of which is high in relation to the value of the resistance
There are connected to each vertical conductor U1 of
the matrix, at the point N1, on the one hand a voltage
source —Uc, through a resistance rU1, and on the other
hand a transistor TMU1 through its collector, the emitter
of the latter transistor being connected to ground, and
the base being connected through a resistance rMU1 to
the output conductor at Q1 of a magnetostatic relay for
registering a second digit, the said relay comprising a
TMU and the aforementioned resistances in the collector
and base circuits thereof.
FIGURE 3 shows exactly the same matrix device as
has already been described with reference to FIGURES
1 and 2, the illustrated part of which is con?ned to a single
ten Dz and to a single unit Un, but to which there is
connected between the points T and M a device consist
ing of a transistor TMD associated with each ten, and of
two transistors TMA and TMB sharing a common point
P, which are the only ones provided in the matrix, the
point P common to the collector of TMB and to the base
of TMD being multiplied at the homologous points of the
second transistor TU1, the collector of which is con
bases of the transistors such as TMD corresponding to
nected to the point Q1 and therefrom through resistor
each other ten conductor. The emitter of the transistor
rMU1 to the base of the transistor TMUI and the emitter
of which is connected to the intermediate units relay Unl 45 TMD is connected to the point T and the collector of the
same transistor TMD is connected to the point M, so that
through a recti?er, the emitter of the transistor TUI being
connected to a voltage source —U0 through a resistance
‘rUnl. The base of the said transistor is connected to a
when this transistor conducts, the resistance rD between
T and M is substantially short-circuited. Connected to the
voltage source —UR. The collector of the transistor TU1
connected to the point Q1 separated from the base of the
transistor TMUl by the resistance rMU1 is also connected
to a voltage source willc through a resistance rlUl. The
resistance rU1 is of the same order of magnitude as the
resistance rD2 or equal thereto. The terminals E of the
base P of the transistor TMD are, on the one hand, the
resistance RMB whose other end is connected to the
negative voltage U,,, and on the other hand the collector
of TMB, the emitter of which is grounded. The base of
the transistor TMB is connected to a point K through a
resistance rMB, the point K also being connected on the
one hand to the resistance RMA, whose other end is at the
negative voltage U6, and on the other hand to the collec
tor of the transistor TMA. The transistor TMA associ
ated with the magnetic core AM, with the recti?er Re,
with the resistances rM and RMA and with the negative
It will be seen that an intermediate tens relay, such as
Dzz, is directly connected to the corresponding tens bar, 60 voltages U0, Ur and U6, is de?ned under the name
“Magneto-Static Relay” in the aforesaid US. Patent
while the intermediate units relay U111 is connected to
relays Dzl, D22, Dzo, Unl,Unz . . . Uno represent the
alternating current supply terminals of the magnetostatic
relays, the control windings of which have not been
the point N1 only through the transistor TMUI.
The operation of the device hereinbefore described is
as follows: when the whole arrangement is inoperative,
with the magnetostatic tens and units relays Dz and U12
i.e. when no intermediate tens or units relay is energized,
the transistors such as TMUl have the point Q1 of their
base at a negative potential, because the resistance r1U1 is
at the potential —U,,. Since the emitter is grounded, it is
positive in relation to the base, and the collector repro
It has been seen that the same was the case
respectively. This device operates as follows: In the case
of a communication between a calling subscriber and a
called subscriber, both of which are connected to the same
conductive. If, for example, the intermediate relay D12
automatic switch, it is merely necessary to “mark” the
called subscriber, that is to say, to cause his ringing relay
to pull up. Since the ringing relay of a free called sub~
scriber is inoperative, a simple marking current causes
the ringing relay to change to the operative position, and
there is therefore no need in this case for the auxiliary
device according to FIGURE 3, the object of which is to
short-circuit the resistance 1D. The relay AM is set into
for the ten conductor 2 and relay U111 for the unit conduc
operation only if the normal marking current is insu?icient
duces substantially at the point N1 the potential of the
emitter, that is to say, ground. No current ?ows through
a connection such as A21—B21, although the point M2 is
at a negative potential, because the recti?er RdZl is non
to bring to the operative position a ringing relay which is
already polarised in a certain sense. If the relay AM is
not energised, the collector of the transistor TMA is non
conductive and consequently the point K is at a negative
potential of —Uc through the resistance RMA.
transistor TMB conducts and the point P assumes a posi
tive potential.
spending bar and the collector of each relay transistor as
sociated with each vertical bar being connected to the
base of the corresponding blocking transistor through a
3. A marking device according to claim 1, wherein a
?rst resistance is disposed between a relay and a common
Under these conditions, the transistor
point on the corresponding horizontal bar, the common
TMD is non-conductive and consequently the tens relay
point being also connected, on the one hand, to one end of
Dz conducts or discharges through the resistance ID, as
a second resistance whose value is high in relation to the
has been seen in FIGURE 2. On the other hand, it the 10 ?rst resistance and, on the other, to the respective connect
relay AM is energised, the point K is at a positive po
ing link, and the direction of the rectifier being such that
tential and the transistor TMB is non~conductive. The
it is not conductive when said common point has the same
point P assumes a negative potential and the transistor
polarity as the point to which the other end of the second
TMD changes into the operative position. The points T
resistance is connected.
and M are then substantially at the same potential and 15
4. A marking device according to claim 3, wherein said
the resistance rD is short-circuited by the transistor TMD.
blocking transistor is connected between at least one of
The normal energising circuit of the winding e of the ring
said vertical bars and the respective relay, said blocking
ing relay, which was closed through the resistances rD
transistor having a collector connected to the common
and rU in series, then only has the single resistance rU.
point of the respective vertical bar, the common point
The current ?owing through the winding e therefore in
between the vertical bar and the collector of the blocking
creases considerably. It the resistances rD and rU are
transistor connected to the second magnetostatic relay be
equal, the current is substantially doubled. It is there
ing also connected to one end of a third resistance of
fore capable of bringing a ringing relay into the opera
equivalent value to said first resistance disposed at the
tive position even if the latter is previously polarised in
common point of the horizontal bar, and means for
the opposite sense, which may be the case in systems for 25 energizing one end of said third resistance at the same po
direct connection to the network or in certain automatic
tential as said other end of the second resistance.
switches, in which absolute priority is given to a number
5. A marking device according to claim 4, wherein each
of lines for which the communication must always be
second magnetostatic relay means is connected at its out
established regardless of the state of the called subscriber.
put conductor to a point common to the ends of two re
The relay AM is therefore rendered operative when the 30 sistances, one of said two resistances being connected at
calling subscriber makes use of the direct connection to
its other end to the base of the blocking transistor and
the network, or in such special cases related to the identity
the other end of the other of said two resistances being
of the calling subscriber. The register, which is capable
at negative potential, the emitter of the said blocking
of identifying the calling subscriber, then does or does
transistor being grounded and the collector thereof being
not render the relay AM operative, depending upon the 35 connected to a common point of a corresponding bar such
that, when the respective magnetostatic relay means is
Transistors of p-n-p-type have been illustrated in the
operative, the blocking transistor is non~conductive and
drawings; it is obvious that a similar arrangement would
when the magnetostatic relay means is operative the tran
be possible with transistors of n-p-n~type, with which it
sistor is conductive and produces a change in the potential
would be suf?cient to adapt the sense of the polarities 40 of the common point of its collector with the correspond
We claim:
1. An electronic marking device for marking a relay of
ing bar.
6. A marking device according to claim 1, wherein each
horizontal bar has input means including an input re
a subscriber to be called in a telecommunication system,
sistance and wherein a device comprising a further mag
comprising a marking matrix including a plurality of in 4:5 netostatic relay associated with two transistors is con
terconnected horizontal bars and vertical bars, means in
nected to the terminals of the resistance incorporated in
cluding an intermediate link for connecting each hori
the input of a horizontal bar, one of the transistors being
zontal bar to each vertical bar at each respective connect
individually associated to short-circuit the input resistance,
ing point, said intermediate link comprising a recti?er in
the emitter and the collector of the said one transistor
series with a winding of a respective subscriber relay at 50 being connected respectively to the ends of the said re
the respective connecting point, a magnetostatic register
sistance, the other transistor being the only one in the
ing relay means including an output means connected to
marking matrix and being directly connected to the said
each horizontal bar respectively and a second magneto
magnetostatic relay, the point of connection between the
static registering relay means including an output means
two transistors being multiplied with all the homologous
connected to each vertical bar of the matrix, respectively,
points of the transistors associated with the input resist
the output means of each said second magnetostatic relay
ances of the corresponding bars, so that when the said
including a blocking transistor connected between the re—
magnetostatic relay is operative the input resistance as
spective second magnetostatic relay and the correspond
ing vertical bar, means for blocking said blocking tran
sistor when the corresponding second magnetostatic relay
sociated with the said bar during marking is short~circuited
by the transistor associated with the said resistance which
60 is itself operative.
is inactive and for unblocking said transistor when the
7. A marking device according to claim 6, wherein said
magnetostatic relay is energized, each horizontal bar hav
further magnetostatic relay for the marking matrix is
ing means including the output means of the respective
connected by the collector of its transistor to the base of
?rst-mentioned magnetostatic relay for applying a po
of said two transistors, the latter transistor having its
tential thereto corresponding to the energized condition of
emitter earthed and its collector connected to the base of
the relay, each vertical bar having means including said
the other of said two transistors which is individually as
blocking transistor for applying a potential thereto to
sociated with a bar, the common points between the base
cause said intermediate link to become conductive for
and the collector being each connected to a negative
energizing said subscriber relay only when the magneto
polarity through a resistance, so that, when the magneto
static relays connected to the respective horizontal and 70 static relay of the marker is rendered operative, the tran
vertical bars leading to said subscriber relay are energized.
sistor associated therewith is rendered non-conductive, the
2. A marking device according to claim 1, wherein each
latter transistor then permitting the transistor associated
magnetostatic relay means comprises a transistor having a
with the input resistance of a bar to be rendered operative.
collector, the collector of the relay transistor associated
8. An electronic marking device according to claim 1,
with each horizontal bar being connected to the corre
wherein said subscriber relay is identi?ed by a plurality of
digits and wherein the magnetostatic registering relay
References Cited in the ?le of this patent
means connected to each horizontal bar of the matrix is
operatively connected for registering a ?rst digit for identi
fying the subscriber relay and the magnetostatic relay
Flood _________________ __ Apr. 2, 1957
eratively connected for registering a second digit for
Faulkner _____________ __ Oct. 21, 1958
identifying said subscriber relay.
Ducamp et al __________ __ Nov. 25, 1958
means connected to the vertical bar of the matrix is op- 5
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