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Патент USA US2851541

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Sept. 9, 1958
?D. o. BAIRD ETAL
2,851,531
AUTOMATIC TELEPHONE SYSTEMS INVOLVING TOLL
_
RECORDING FACILITIES
Filed March 12, 1952
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Doug/as 0. Baird
Raymond G B/E/enbe/jg
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?Sept. 9, 1958
D. o. BAIRD HAL
23519531
AUTOMATIC TELEPHONE SYSTEMS INVOLVING TOLL
RECORDING FACILITIES
Filed March 12, 1952
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Sept. 9, 1958
2,851,531
D. O. BAIRD ETAL
AUTOMATIC TELEPHONE SYSTEMS INVOLVING TOLL
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RECORDING FACILITIES
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Sept. 9, 1958
D. o. BAIRD ETAL
2,851,531
AUTOMATIC 'rsuszeaons SYSTEMS INVOLVING TOLL
RECORDING FACILITIES
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Sept. 9, 1958
D. 0. BAIRD ETAL
2519531
AUTOMATIC TELEPHONE SYSTEMS INVOLVING TOLL
RECORDING FACILITIES
Filed March 12, 1952
LINE CIR. 3004
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INVENTORS
Douglas 0 Baird
Raymond G B/e/enbE/g
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Sept. 9, 1958
D. 0. BAIRD ETAL
AUTOMATIC TELEPHO NE SYSTEMS INVOLVING TOLL
235L531].
RECORDING FACILITIES
Filed March 12, 1952
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Raymond G. BIe/enberg
M , WM
4273/5.
nited States PatentO " ice
2,851,531
Patented Sept. 9, 195,8
2
ment to achieve this result has. been suggested due pri
marily to the dif?culty that the trunk noted must be se
2,851,531
AUTOMATIC TELEPHONE SYSTEMS INVOLVING
TOLL RECQRDINGFACILITIES
Douglas 0. Baird, Skokie, and Raymond? G. Bielenberg,
Berwyn, 11]., assignors to General Telephone Labora
tories, incorporated} a corporation of Delaware
lected by the switching apparatus in response to certain
?rsto?ice code digits and in response to certain combina
5
tions of ?rst and second ot?ce code digts and. in response
to certain combinations of ?rst and second and third of
?ce code digits, and the value of each of the ot??ce code
digits noted employed in the operation ofv the switching
apparatus to seize the trunk must, be recaptured and
ApplicationlMarch 12, 1952, Serial No. 276,164
20 Claims: (Cl. 179-9)
registered subsequent to operation of the switching ap
Each of?ce of an. automatic telephone system of the
character noted? usually comprises a plurality of trunks
terminating in switching. apparatus, a plurality of register
translators, and equipment. responsive to the presence of
paratus, then to complete a connection therefrom to an
idle trunk line extending to the called of?ce, or at least
to a tandem o?ice in route to the called oi?ce, and then
subscriber substation on the calling line then proceeds
matic telephone system of the character noted, wherein
paratus to seize the trunk.
Accordingly,lit is a general objectof the present inven
tion to provide improved apparatus for setting-up tele
phone connections in an automatic telephone system that
The present invention relates to automatic telephone 15 employs at the calling o?ice ?rst and second and third
systems involving toll recording facilities and more par
groups of toll links that, are respectively selected by oper
ticularly to improved systems of the general character
ation of subscriber controlled automatic switching? ap
disclosed in the 'copending application of Douglas 0.
paratus respectively in response to certain ?rst called
Baird and Raymond G. Bielenberg, Serial No. 231,728,
o?ice code digits, to certain combinations of ?rst and
?led June 15', 1951, now Patent No. 2,739,184, granted 20 second called oilice code digits, and to certain combina
March 20, 1956, in which short or suburban toll calls
tions of ?rst and second and third called o?ice code digits,
are set-up directly by subscribers vat calling subscriber
wherein the selected toll link is operated automatically
substations, without the assistance of operators, and in
by the mere selection thereof to recapture the one or two
which records are automatically produced in conjunction
or three particular called of?ce code digits employed in
with such toll calls for subscriber billing purposes.
the selecting operation of the automatic switching ap
to send therefrom over the connected trunk line the re
a calling line for connecting the calling line to an idle one 30 captured one or two or three called o?ice code digits.
of the trunks and for connecting an idle one of the regis
Another object of the invention is to provide improved
ter-translators to the one trunk. The subscriber at the
apparatus 'for setting-up telephone connections in an auto
to dial the three of?ce code digits of the desired or called
the mere selection of the toll link e?lects the automatic
office and the four numerical digits of the desired. or 35 identi?cation of the directory number of the calling sub
called subscriber line therein. The one register-translator
scriber line connected thereto by the automatic switching
registers the three o?ice code digits and determines there
from whether the call is to be completed in the local o?ice
of the calling subscriber line or in a remote oi?ce. In
the event it is determined that the call is to be completed
in the local oihce, the register-translator is dismissed after
registering the third office code digit so that the four nu
merical digits dialed over the calling line are e?ective
directly to operate the switching apparatus terminating'the
one trunk in order to extend the connection from the
one trunk to the- called line in the local of?ce. On the
other hand, in the event. it is determined that the call is
to be completed in a remote o?ice, the register-translator
is held and later effects operation of the switching ap
apparatus and the automatic registration therein of the
digits of the directory number thus identi?ed.
Another object of the invention is to provide improved
apparatus for setting-up telephone connections in an
automatic telephone system of the character noted,
wherein the digits dialed over the calling subscriber line
subsequent to the operation of the switching apparatus
to select the toll link are registered directly in the selected
45 toll link and then automatically repeated, therefrom, as
received, over the connected trunk line.
Another object of the invention is, to provide improved
apparatus for setting-up telephone connections in an auto
matic telephone system of the character noted, wherein
paratus terminating the one trunk to select a trunk line 50 a record is automatically made in the toll link of all of
- extending to the remote o?ice, or at least to a tandem
the data registered therein incident to the release of the
o?ice in route to the remote of?ce, and then transmits
digits over the trunk line noted so that other equipment
connection routed thereby between the calling subscriber
line and the connected trunk line, regardless of Whether
and switching apparatus may be controlled to complete
the connection is ultimately answered at the called sub
the connection to. the called line in the remote o-f?ce. 55 scriber substation in the called o?ice.
The connection between the one trunk and the trunk
A further object of the invention is to provide in an
line over which the toll call is completed includes equip
automatic telephone system of the character noted, an
ment for accumulating items of record information in
improved arrangement of the three groups of toll links
conjunction with the toll call; and facility is provided for
into an improved trunking plan, wherein the, toll links
60 in each group are further arranged into subgroups pro
recording the items noted for billing purposes.
A telephone system of the character noted is quite
vided with common over?ow toll links, so as to achieve
satisfactory in operation; however, the number of register
simpli?cation and specialized selection of the individual
toll links in the several subgroups.
a register-translator is employed in conjunction with the
A further object of the invention is to provide in an
extension of each call regardless of whether the call ulti 65 automatic telephone system of the character noted, a toll
mately proves. to be a local call or a toll call.
link incorporating an improved and simpli?ed arrange
While it has been proposed that the switching apparatus
ment for recapturing the digit or digits of the called
in each office be arranged so that the trunk to which the
o?ice code that are employed in the operation of the
register-translator is connected is seized by the switching
stitching apparatus to bring about the selection of the
translators required in each o?ice is rather large since .
apparatus only in the event of the extension of a toll 70 toll link.
call from the calling line, no simple arrangement of equip~
Further features of the invention pertain to the pan
2,851,531
3
4
ticular arrangement of the circuit elements of the tele
group of trunk lines, including the trunk line 112, the
phone system, whereby the above-outlined and additional
SP9 of?ce and the M06 o?ice are interconnected by a
operating features thereof are attained.
group of trunk lines, including the trunk line 114; and
Section 1.--The general arrangement of the telephone
system
the WA2 o?ice and the YU5 of?ce are interconnected
by a group of trunk lines, including the trunk line 113.
In the telephone system and with reference to the RA6
office, the group of trunk lines 240, etc., comprises a
The invention, both as to its organization and method
of operation, together with further objects and advantages
?rst choice route to the RA3 o?ice, while the group of
thereof, will best be understood by reference to the fol
trunk lines 220, etc., comprises a second choice route
lowing speci?cation taken in connection with the ac 10 to the RA3 of?ce via the LI8 office in tandem relation.
companying drawings in which Figure 1 is a schematic
Similarly, with reference to the RA6 office, the group
diagram of the area served by the telephone system in
of trunk lines 230, etc., comprises a ?rst choice route to
corporating apparatus embodying the present invention;
the WA2 of?ce, while the group of trunk lines 210, etc.,
Fig. 2 is a schematic diagram of the general arrangement
comprises a second choice route to the WA2 o?ice via the
of the apparatus incorporated in one of the o?ices of the
SP9 office in tandem relation.
system shown in Fig. 1; Figs. 3~l2, inclusive, taken to
Referring now to Fig. 2, in. the RA6 o?ice, two of the
gether, illustrate the details of certain of the apparatus
subscriber substations T 1 and T2 are illustrated as being
incorporated in the o?ice shown in Fig. 2, which ap
connected to the subscriber lines having the respective
paratus has embodied therein the features of the in
directory numbers: 7930 and 7981. Each of the sub
vention as brie?y outlined above; Fig. 13 illustrates the
scriber lines is provided with a line circuit individual
mode of combining Figs. 3?l2, inclusive, to form a uni
thereto, the line circuits 300 and 400 being individual to
?ed diagram, Fig. 14 illustrates a modi?cation in one of
the respective subscriber lines 7930 and 7981. More
the line circuits and in one of the toll recording links that
over, the subscriber lines 7930, etc., are of ?rst and sec
may be substituted in the corresponding circuits of Figs.
ond classes depending upon whether or not the sub
3 and 10, respectively; and Fig. 15 illustrates a modi?ca 25 scriber lines are entitled to access to the toll recording
tion in the trunking plan that may be substituted for part
equipment and consequently to automatic suburban toll
of that illustrated in Fig. 2.
call service. Speci?cally, any subscriber line may be
More particularly, Fig. 3 illustrates the details of one
readily converted between the ?rst and second classes by
the manipulation of a plug with respect to an associated
of the line circuits incorporated in the o?ice noted; Fig. 4
illustrates the general arrangement of some of the switch
jack in the terminating line circuit, as explained more
fully hereinafter. Also the RA6 o??ice comprises a local
ing apparatus incorporated in the o?ice noted; Figs. 5 to
switch train, including a plurality of ?nder-?rst selector
? 10, inclusive, taken together, illustrate the details of one
of the toll recording links of the one-digit recapture type
groups respectively associated with the individual hundred
incorporated in the oi?ce noted; Fig. 11 illustrates the
line groups of subscriber lines. The group of ?nder-?rst
details of a fragmentary portion of one of the toll record
selectors associated with the 7900 group of subscriber
ing links of the two-digit recapture type incorporated in
lines includes the ?nder-?rst selector, consisting of the
the of?ce noted; and Fig. 12 illustrates the details of a
fragmentary portion of one of the toll recording links
?nder 360 has access to the 7900 group of subscriber
of the two-digit recapture type incorporated in the of?ce
lines, including the subscriber lines 7930 and 7981 illus
?nder 360 and the ?rst selector 410.
Accordingly, the
" noted; and Fig. 13 illustrates the details of a fragmentary 40 trated. Also this group of ?nder-?rst selectors is pro
portion of one of the toll recording links of the three
vided with an associated distributor 341 that is opera
digit recapture type incorporated in the of?ee noted.
Referring now to Fig. 1, the telephone system there
tively associated with the line circuits 400, 300, etc., of
the subscriber lines in the 7900 group.
illustrated serves an area comprising a number of of?ces,
Further, the local switch train comprises appropriate
eight of which are illustrated as: RAvenswood 3, RAn
groups of second selectors there being illustrated, the
sixth group of second selectors, including the second
selector 411 that is accessible via the associated trunk
412 to the ?rst selectors 410, etc., and the seventh group
of second selectors, including the second selector 413
50 that is accessible via the associated trunk 4114 to the
dolph 6, WAbash 2, LIncoln 8, SPring 9, YUkon 5,
MAdison 3, and MOnroe 6. Each of the offices noted
is of the automatic type and serves a maximum of 10,000
subscriber lines; and each of the offices comprises ap
paratus for establishing local connections between the
?rst selectors 410, etc. Also the local switch train com
various subscriber substations therein, apparatus for ex
prises appropriate groups of third selectors, there being
tending connections from the various subscriber substa
illustrated, the second group of third selectors including
tions therein to the other o?ices, apparatus for complet
the third selector 415 that is accessible via the associated
ing connections extended from the other of?ces to the
subscriber substation therein, and apparatus for extend 55 trunk 416 to the second selectors in the seventh group
ing tandem connections between various of the other
413, etc. Also the local switch train comprises appro
offices. Also each of the offices comprises equipment
priate groups of fourth selectors, there being illustrated
for automatically producing toll records in conjunction
the sixth group of fourth selectors including the fourth
with completed toll connections involving calling sub
selector 417 that is accessible via the associated trunk
418 to the third selectors in the second group 415, etc.
scriber substations therein.
Also the local switch train comprises appropriate groups
The RA3 oflice and the RA6 of?ce are interconnected
of ?fth selectors, there being illustrated the seventh
by a group of trunk lines, including the trunk line 240;
group of ?fth selectors including the ?fth selector 419
the RA6 of?ce and the WA2 of?ce are interconnected by
that is accessible via the associated trunk 420 to the
a group of trunk lines, including the trunk line 230; the
fourth selectors 417, etc. Finally, the local switch train
RA3 of?ce and the LI8 of?ce are interconnected by a
comprises appropriate groups of connectors, there being
group of trunk lines, including the trunk line 110; the
LI8 o?ice and the RA6 of?ce are interconnected by a
group of trunk lines, including the trunk line 220; the
L18 office and the SP9 o?ice are interconnected by a
group of trunk lines, including the trunk line 115; the
LIS o?ice and the MAS of?ce are interconnected by a
illustrated the ninth group of connectors including the
connector 421 that is accessible via the associated trunk
422 to the ?fth selectors 419, etc. The connectors 421,
etc., in turn, have access to the 7900 group of subscriber
lines including the subscriber lines 7930 and 7981, re
group of trunk lines, including the trunk line 111; the
spectively extending to the subscriber substations T1 and
RA6 of?ce and the SP9 of?ce are interconnected by a
T2.
Also in the RA6 of?ce, there are provided an appro
group of trunk lines, including the trunk line 210; the
?SP9 of?ce and the WA2 of?ce are interconnected by a 75 priate group of toll reeording links of the one-digit re
2,851,531?
capture- type 500, etc., that are accessible via associated
trunks 510, etc., to the various ?rst selectors 410, etc.;
an appropriate group. of toll recording links of the two
digit recapture type 1100, etc., that- are accessible via
associated~ trunks 1110, etc., to the- various second selec
tors 411, 413, etc.; and an appropriate group of toll
6
In view of the foregoing, it will be ?understood that each
of the other o?ices. RA3, etc.,, is provided with apparatus
substantially identical to that described above in conjunc
tion with the RA6 o?ice.
Section 2.?The apparatus incorporated in the telephone
system
etc., that are accessible. via associated trunks 1210, etc.,
In the RA6 office, each of the. subscriber substations
to the various third selectors 415, etc.' Speci?cally, in
T1, etc., is provided with conventional subscriber substa
theexample illustrated, the- trunk 510 extending to the
tion apparatus, including a telephone instrument, a dial
toll recording link 500 is accessible in the third, ?fth and
mechanism, and a ringer. Preferably the ?nders 360, etc.,
ninth levels- of the-?rst selectors 410,.etc.; the trunk 1110
the various selectors 201, 410, 411, 413,, 415, 417,419,
extending to? the toll recording link 1100 is accessible in
etc., and the connectors 421, etc., are of conventional
the second and sixth levels of the second selectors 411,
Strowger types.
etc., and in the seventh levels of. the secondselectors 413, 15
The line circuits 300, 400, etc., may be substantially
etc.; and the trunk 1210 extending to the toll recording
identical; and the line circuit 300, illustrated in Fig. 3,
link. 1200 is accessible in the ?rst, third and seventh
comprises a relay group, including a cutoff. relay R310,
levels of the third selectors 415, etc. Each of the toll
a line relay R320, and a lockout relay R330. Also the
recording links 500, 1100, 1200, etc., terminates in an
line circuit 300 comprises a lockout tone transformer 342
automatic switch individual thereto; and an allotter 520
and a jack 355 that is adapted -to receive :an associated
is provided that is commonly associated with the toll
plug 356 terminating a gaseous discharge tube 357; the
recording links 500, etc., and has access thereto, for a
lockout tone transformer 342 and the gaseous discharge
purpose more fully explained hereinafter. Further, a
tube 357 comprising a portion of an arrangement that is
marking cable 370 is provided that is commonly asso
employed for the purpose of converting the subscriber
ciated with each of the line circuits 400, 300, etc., and
line 7930 terminated by the line circuit 300 between the
with each. of the toll recording links 500, 1100, 1200, etc.,
?rst and second classes, previously mentioned. More
that is employed in an identifying arrangement, described
speci?cally, the subscriber line 7930 may be converted
more fully subsequently. Further, there is provided a
from the ?rst class that is entitledto automatic suburban
manual and intercept operator position 423 that is acces
toll dialing service to the second class that is denied this
recording links of the three-digit recapture type 1200,
sible via a group of trunks 424, etc., to the various 30 service merely by inserting, the plug 356 into the jack 355,
as explained more fully hereinafter. Also the line cir
cuit 300 is provided with four groups of. gaseous dis
selectors in the local switch train. As illustrated, the
trunk 424 is ?accessible in the ?rst, second, fourth, eighth
and tenth levels of the ?rst selectors 410, etc., and acces
sible in_the ?rst, third, fourth, ?fth, sixth, eighth, ninth
and tenthlevels of the second selectors ?413, etc., and
accessible in the second, fourth, ?fth, eighth, ninth and
tenth levels of the third selectors 415, etc., and accessible
in certain levels, not shown, of the second selectors 411,
etc. As shown in Fig. 2 in the RA6 o?ice, the trunk
lines 210, 220, 230, 240, etc., terminate in trunk circuits
211, 221, 231, 241, etc., individual thereto, that- are
provided with individual incoming trunks 213, 223, 233,
243, etc., as well as individual outgoing trunks 212, 222,
232, 242, etc., terminating in individual line switches
214, 224, 234, 244, etc. A group of incoming links 250,
etc., is provided that is accessible to the various line
switches 214, 224, 234, 244, etc. Each of the incoming
links 250, etc., is provided with an associated terminating
trunk selector 251, etc., and an individual ?nder 252, etc.
The trunk selectors 251, etc. terminating the incoming
links 250, etc., have access to the various incoming
trunks 213, 223, 233, 234, etc., ?extending to the trunk
circuits 211, 221, 231, 241, etc., terminating the trunk
lines 210, 220, 230, 240, etc. Moreover, the trunks 213,
223, 233, 243, etc., are also accessible to the automatic
switches respectively terminating the toll recording links
500, 1100, 1200, etc. Further, the ?nders 252, etc.,
charge tubes 371, etc., 372, etc., 373, etc., and. 375, etc.,
that are commonly connected to the control conductor
I 353 of the subscriber line 7930 extending to the associated
?nders 360, etc. The marking cable 370 comprises four
groups of marking conductors T370, H370, D370 and
U370 respectively corresponding to the thousand, the
hundred, the ten and the unit digits of the directory num
ber of the various subscriber lines 7930, etc. Each of
the groups of marking conductors. T3170, etc., includes
four individual marking conductors respectively constitut
ing the W, X, Y and Z marking conductors of a WXYZ
code marking system. Accordingly, in the line circuit
300, the one or more gaseousv discharge tubes 371, etc.,
are connected to the individual marking conductors in
the group T370, in accordance with the thousand digit of
the directory number of the subscriber line 7930, which
arrangement requires only one tube .371 connected to the
W conductor in? the group T370 in-accordance with the
digit 7 in the usualWXYZ code marking system. Simi
larly, the one or more gaseous discharge. tubes 372, etc.,
are connected to the individual marking conductors in
group H370 in accordance with the hundred'digit of
directory number of the. subscriber line 7930, which?
rangement requires only one tube 372. connected to
the
the
ar~
the
' Y conductor in the group H370 in accordance with the
individual to the incoming links 250, etc., have access
digit 9 in the usual WXYZ code marking system. Simi
to a group of register translators 253, etc. Finally, the
switch train in the RA6 o?ice comprises a group of 60 larly the one or more gaseous discharge tubes 373, etc.,
are connected to the individual marking conductors in
o?ice selectors 201, etc., that are accessible via individ
the
group. D370? in accordance with the ten digit of the
ual trunks 202, etc.,. to the trunk selectors 251, etc.; the
directory
number'of the subscriber line 7930, which ar
o?ice selectors 201, etc., having access to the various
rangement requires two tubes 373 and 374, respectively
groups? of fourth selectors 417, etc., via the associated?
connected to the W and Z conductors in the group D370
trunks 418, etc. As illustrated, the trunk selectors 251,
in
accordance with the digit 3 in the usual WXYZ code
etc. and the various automatic switches respectively ter
minating the toll recording links 500, 1100, 1200, etc.,
have access to the trunks 243, 233, 223 andv 213 in the
respective second, fourth, sixth andeighth levels thereof;
and the trunk selectors 251, etc., have access to the
trunks 202, etc., in the tenth levels thereof. Finally, it
is noted that each of the toll recording links 500, 1100,
marking system. Finally, the one or more gaseous dis
charge tubes 375, etc., are connected to the. individual
marking conductors in the group U370 in accordance
with the unit digit of the directory number of the sub
scriber line 7930, which arrangement requires only one
tube 375 connected to the Z conductor in the group U370
in accordance with the digit 0 in the usual WXYZ code
1200, etc., comprises toll recording equipment individ
marking system. Preferably the various tubes 371, etc.,
ually incorporated therein and essentially including a
are removably received in associated jacks. or ?xtures
magneticrecorder, as explained more fully hereinafter. 75 commonly terminating conductor 353 and respectively
2,851,531
7
terminating the various marking conductors in the groups
8
.
battery 516, two constantly rotating sending cams 92
and 1045 and a constantly rotating timing cam 712.
T370, etc., so that the various tubes 371, etc., may be
The booster battery 516 that is provided may be of +70
readily changed with respect to the associated jacks or
volts with respect to ?48 volts exchange battery and is
?xtures in the event of a change in the directory number
provided with a grounded negative terminal and an un
of the subscriber line terminated by the associated line
grounded positive terminal; the impulsing cam 926 may
circuit 300, etc.
have a speed of rotation of about ten revolutions per
In view of the above, it will be understood that while
second, the impulsing cam 1045 may have a speed of rota
the line circuit 400 is substantially identical to the line
tion of about twenty revolutions per second, and the tim
circuit 300, the various tubes incorporated therein are
plugged into the associated ?xtures or jacks in accord 10 ing cam 712 has a speed of rotation of one revolution per
minute.
ance with the directory number 7981, which it may be
Operation of the recapture relay R830 effects the re
assumed has been assigned to the terminated subscriber
capture of the ?rst called of?ce code digit 3, and reg
line 7981.
isters the ?rst of?ce code digit 3, at the contacts 834,
The arrangement of the line circuits 300 and 400 in
order to obtain identi?cation of the directory numbers of 15 upon the third marking conductor M3 of the group of
marking conductors 890; and upon operating, the recap
the calling subscriber lines incident to the extension of
ture relays R835 and 840 effect corresponding functions
suburban toll calls therefrom and to obtain class control
with respect to the ?rst called o?ice code digits 5 and
with respect to the extension of such suburban toll calls
from the calling subscriber lines, is disclosed in the co 20 9. Also upon operating, the recapture relay R830 effects
the registration, at the contacts 833, ?rst and second
pending divisional application of Douglas 0. Baird and
choice routes between the RA6 of?ce and the next o?ice
Raymond G. Bielenberg, Serial No. 498,803, ?led April
to
which the connection should be extended based upon
4, 1955.
the ?rst called o?ice code digit 3 and dependent upon
Also in the RA6 o?ice, the distributors 341, etc., and
the positions of the route relays R850 and R860, as
the operator position 423 may be of conventional types;
while the trunk circuits 211, etc., the incoming links 250, 25 explained more fully hereinafter; and upon operating,
the recapture relays 835 and R840 e??ect corresponding
etc., the trunk selectors 251, etc., and the register trans
functions with respect to the ?rst called office code digits
lators 253, etc., may be of any suitable type, and are
5 and 9.
preferably of the character of the corresponding pieces
of apparatus disclosed in the copending application of 30 The office register 02 is of the minor type including
a wiper 021 provided with an associated contact bank,
Douglas 0. Baird and Raymond G. Bielenberg, Serial No.
a rotary magnet 022 for driving the wiper noted step
231,728; in which a trunk circuit (corresponding to the
by step in the clockwise direction away from its home
trunk circuit 211) is illustrated at 300 in Fig. 3 thereof;
position, a release magnet 023 for releasing the wiper
an incoming link (corresponding to the incoming link
250) is illustrated at 400 in Fig. 4 thereof; a trunk selec 35 noted and for causing it to be returned back into its
home position, and a set of switch springs 024 that is
tor (corresponding to the trunk selector 251) is illustrated
operated
when the wiper noted is driven out of its home
at 450 in Fig. 4 thereof; and a register translator (corre
position. The of?ce code register 03 and the numerical
sponding to the register translator 253) is illustrated at
registers N1, N2, N3 and N4 are identical to the o?ice
900 in Figs. 9 and 10 thereof.
code register 02 and respectively comprise the wipers 031,
The toll recording links of the one-digit recapture type
N11, N21, N31 and N41, the operate magnets 032, N12,
500, etc., may beidentical; and the link 500 illustrated
N22, N32 and N42, the release magnets 033, N13, N23,
in Figs. 5 to 10, inclusive, comprises a relay group in
N33 and N43, and the sets of switch springs 034, N14,
cluding a line relay R530, a hold relay R540, a switch
N24, N34- and N44. The register sequence switch 1R5
relay R550, a register relay R560, an identity relay R570,
is of the minor type including a wiper 1RS1, provided
a record relay R580, a line relay R590, a hold relay
R610, an answer relay R620, a shunt relay R630, a series
relay R635, a step relay R640, a switchthrough relay
with an associated contact bank, a rotary magnet 1RS2
for driving the wiper noted step by step in the clockwise
direction away from its home position, a release mag
R650, a gang relay R710, a pickup relay R720, a start
net 1RS3 for releasing the wiper noted and for causing
relay R730, a series relay R810, a step relay R815, a lock
it to be returned back into its home position, and a set
out relay R820, a plurality of recapture relays, three of
of switch springs 1RS4 that is operated when the wiper
50
which are illustrated at R830, R835 and R840, two route
noted is driven out .of its home position. The send
relays R850 and R860, a busy relay R910, a shunt relay
sequence switch 1S5 is of the rotary type including two
R920, a stop-send relay R930, a release relay R1015, and
wipers 1581 and 1SS2 provided with individually asso
a gang relay R1030. In passing, it is noted that the re
ciated contact banks, a rotary magnet 1SS3 for driving
capture relays R830, R835 and R840 respectively corre
the wipers step by step in the clockwise direction, and
spond to the recaptured digits 3, 5 and 9 and are respec
a set of switch springs 1885 that is operated when the
tively operated when the incoming trunk 510 extending
wipers noted are driven out of their home positions.
to the toll recording link 500 is selected in. the respective
The digit send switch DS is of the rotary type including
third,.?fth and ninth levels of the ?rst selectors 410, etc.
two wipers D81 and D82 provided with individually asso
Also the toll recording link 500 comprises four groups
of WXYZ storage relays 1001, 1002, 1003 and 1004 that 60 ciated contact banks, and a rotary magnet DS3 for driving
the wipers noted step by step in the clockwise direction
are employed for the purpose of storing the respective
away from their home positions. The ten minute timer
thousand, hundred, ten and unit digits of the directory
TT is of the minor type including a wiper TTl provided
number of a calling subscriber line connected thereto,
with an associated contact bank, a rotary magnet TT2
as well as six storage switches or registers 02, 03, N1,
for driving the wiper noted step ?by step in the clock?
N2, N3 and N4 that are employed for the purpose of
wise direction away from its home position, a release
storing the respective second of?ce code digit, and third
magnet TT3 for releasing the wiper noted and for caus
office code digit of a three-digit called of?ce code, and
ing it to be returned back into its home position, and
the thousand digit, hundred digit, ten digit and unit digit
a set of switch springs TT4 that is operated when the
of a four-digit directory number of a called subscriber
line involved in a connection routed via the toll record 70 wiper noted is driven out of its home position. The unit
minute timer UT is of the rotary type, including two
ing link 500. Further, the toll recording link 500 com
wipers UTl and UT2 provided with individually associ
prises a register sequence switch IRS, a send sequence
ated contact banks, and a rotary magnet UT3 for driving
switch 158, a digit send switch DS, a record sequence
the wipers noted step by step in the clockwise direc
switch RSS, a ten minute timer switch TT, and a unit
minute timer switch UT, as well as a source of booster 75 tion. Finally, the record sequence switch RSS is of the
9
2,851,531
minor type including a wiper RSS1 provided with an asso
ciated contact bank, a rotary magnet RSS2 for driving
the wiper? noted step by step in the clockwise direction
away from its home position, a release magnet RSS3
for releasing the wiper noted and for causing it to be
returned backinto its home position, and a set of switch
springs RSS4 that is operated when the wiper noted is
driven out of its. home position.
Further, the toll recording link 500 comprises a re
10
digit registers. Thus the toll recording link 1100:0fthe
two-digit recapture type is somewhat more simpli?ed
than the toll recording link 500 of. the one-digit recapture
type in view of the fact that only one called o?ice code
register is required therein, since the ?rst two of the three
called of?ce code digits are recaptured by the recapture
relays R1130, etc.
The toll recording links of the three-digit recapture
type 1200, etc., may be identical; and the link 1200, a
peater 625 including coupled windings 626, 628 and 627, 10 fragmentary portion of which is illustrated in Fig. 12,
629, and is: terminated by a switching mechanism 660
of the Strowger type. The mechanism 660 includes a
wiper shaft carrying three wipers ?661, 662, and 663, a
vertical magnet M664 for driving the wiper shaft step
by step in the vertical direction away from its. normal
vertical position, a rotary magnet M665 for driving the
wiper shaft step by step in the rotary direction away
from its normal rotary position, and a release magnet
M667 for releasing the wiper shaft and for causing it
comprises an incoming trunk 1210 and a relay group, in
cluding a plurality of recapture relays, three of the re
capture relays being illustrated at R1230, R1235 and
R1240, a lockout relay R1220, two route relays R1250
and R1260, etc. In the arrangement, the recapture
relays R1230, R1235 and R1240 respectively correspond
to the ?rst and second and third'called office. code digit
combinations: 7?2?1 and 7-2?3 and 7?2?7. Thus the
recapture relay R1230 is operated to recapture. the com
to be returned back into its normal rotary and vertical
bination of the ?rst andsecond and third called ol?ce
positions. Also associated with the Strowger mechanism
code digits 7 and 2 and 1 and is operated in response to
660 are two sets of switch springs S632 and. S633 that
seizure of the incoming trunk-1210 in the ?rst level of
are operated when- the wiper shaft is driven one step in
the third selectors 415, etc. Upon. operating, the recap
the vertical direction out of its normal vertical position,
ture relay R1230 registers, at the contacts 1231, the ?rst
25
as well as a set of switch springs S517 that is operated
called o??ice codedigit 7 upon the associated group of
when the wiper shaft is driven eleven steps in the rotary
marking conductors; registers, at the contacts 1232, the
direction away from its normal rotary position. Finally,
second called 'of?ce code digit 2 upon the associated group
the toll recording link 500 comprises a magnetic recorder
of marking conductors; registers, at the contacts 1233,
700 individual thereto and including a magnetic record
the third called office code digit 1 upon the associated
ing head 706 carrying an associated winding 708 and 30 group of marking conductors; andregisters, at the con
operatively associated with an elongated paramagnetic
tacts 1234, ?rst and second choice routes between the
medium 701 carried by two reels 702 and 703. In the
RA6 office and the next o?ice to which the connection
arrangement, the medium 701 is wound from the reel
should be. extended, based upon the combinationof the
702 onto the reel 703 by a drive connection between a
?rst and second and third called o?ice-code digits 7?2?1
motor 704 and the reel 703, the drive connection includ
and dependent upon the positions of. the route relays
ing a suitable power transmission 705; In the arrange
R1250 and R1260, as explained more fully hereinafter.
ment the elongated medium 701 may consist of a wire
. The respective functions of the recapture relays R1235
or tape formed directly of paramagnetic material or it
and R1240 in order to bring about the recapture of the
may consist of a wire or tape formed of paper or other
.combinations of the ?rst and second and third called
nonmagnetic material and coated with a paramagnetic 40? of?ce code digits 7?2.?3 and 7-2-7 are the same as that of
material.
the recapture relay R1230, described. above. Further,
The toll recording links of the two-digit recapture type
the toll recording link 1200 comprises the. register se
1100 may be identical; and the link 1100, a fragmentary
quence switch 3RS, the send sequence'switch 358, etc.,
portion of which is illustrated in Fig. 11, comprises an
as well as four numerical called line digit registers. Thus
incoming trunk 1110 and a relay, group including a plu~ 45 the toll recording link 1200 of. the three-digit recapture
rality of recapture relays, three of the recapture relays
type is somewhat more simpli?ed than. thetoll recording
being illustrated at R1130, R1135, and R1140, a lockout
link 1100 of the two~digit recapture type, in View of the
relay R1120, two route relays R1150 and R1160, etc.
fact that no called of?ce code register isrequired therein,
In the arrangement, the recapture relays R1130, R1135 and
since all of the three called of?ce code digits. are recap
R1140 respectively correspond to the ?rst and second 50 tured by the recapture relays. R1230, etc.
called o?ice code digit combinations 6?2 and 6-6 and
The allotter 520 that is commonly associated with the
7-7. Thus the recapture relay R1130 is operated to re
toll recording links 500, 1100, 1200, etc., comprises, as
capture the combination of the ?rst and second called
illustrated in Fig. 5, a stop relay R525, a common start
of?ce code digit 6 and 2 and is operated in response to
conductor 527, individual conductors 528, etc., extending
seizure of the incoming trunk 1110 in the second level 55 to the respective links 500, etc., and a rotary switch. 521,
of the second selectors 411, etc. Upon operating, the
including a wiper 522 provided with an associated con
recapture relay R1130 registers, at the contacts 1131, the
tact bank terminating. the conductors 528, etc., as well as
?rst called o?ice code digit 6 upon the associated group
a rotary magnet M523 for driving the wiper noted step
of marking conductors; registers, at the contacts 1132,
by step in the clockwise direction.
the second called of?ce code digit 2 upon the associated 60
The connection and arrangement of the apparatus in
corporated in the telephone system will best be under
group of marking conductors; and registers, at the con
stood from the following description of the setting-up of
tacts 1133, ?rst and second choice routes between the
various telephone connections therein.
RA6 ol?ce and the next o??ice to which the connection
should be extended based upon the combination of the
Section 3.?~L0cal calls in the RA6 ol??ce
?rst and second called of?ce code digits 6 and 2 and de~ 65
pendent upon the positions of the route relays R1150
Considering now the extension of a local call from a
and R1160, as explained more fully hereinafter. The
calling subscriber substation to a called subscriber sub
respective functions of the recapture relays R1135 and
station in the RA6 ol?ce, such, for example, as a call
R1140 in order to bring about the recapture of the com
from the calling subscriber substation T1 to the called
binations of ?rst and second called o?ice code digits 6?6
subscriber substation T2, the subscriber at the calling
and 7-7 are the same as that ?of the recapture relay
subscriber substation T1 initiates the call and then dials
R1130, described above. Further, the toll recording link
the called of?ce code RA6 (726) followed by the nu
1100 comprises the register sequence switch 2R8, the
send sequence switch v2SS, etc., as well as a third called
merical designation 7981 of the subscriber line extending
to the called subscriber substation T2. When the call is
Office code digit register and four numerical called line 75 initiated at the calling subscriber substation T1,. a loop
2,851,531
11
circuit, including the line conductors 351 and 352 of the
subscriber line 7930, as well as the contacts 311, 312 and
333, is completed for energizing in series the upper and
lower windings of the line relay R320 in the line circuit
300 individual to the calling subscriber line 7930, whereby
the line relay R320 operates. Upon operating the line
12
selector 419 may select the trunk 422 extending to the
connector 421. The connector 421 responds to the third
numerical digit 8 and to the fourth numerical digit 1 to
select the subscriber line 7981 extending to the called sub
scriber substation T2.
The subsequent operation of the connector 421 depends
upon the idle or busy condition of the called subscriber
substation T2 at this time. First assuming that the called
subscriber substation T2 is busy, the connector 421 oper
ates the return busy tone over the connection back to the
relay R320 interrupts, at the contacts 324, the normal con
nection from battery potential via the winding of the
cutoff relay R310 to the control conductor 354 of the
subscriber line 7930; and completes, at the contacts 323,
a path for applying direct ground potential to the control
conductor 354; whereby the subscriber line 7930 is marked
calling subscriber substation T1, whereby the subscriber
thereat releases the connection in a conventional manner.
Now assuming that the called subscriber substation T2 is
as busy to the connectors in the local switch train having
idle, the connector 421 operates to project ringing current
access thereto. Also the line relay R320 completes, at the
contacts 321, a connection from battery potential via the 15 over the called subscriber line 7981 and to return ring
back tone over the connection to the calling subscriber
winding of the cutoff relay R310 to the control conduc
substation T1. Subsequently, when the subscriber at the
tor 353 of the subscriber line 7930 appearing before the
called subscriber substation T2 answers-the call, the con
?nders 360, etc. Finally, the line relay R320 completes,
nector 421 operates to interrupt the projection of ringing
at the contacts 322, a path, including the contacts 338, for
applying ground potential to the start conductor 340 ex 20 current over the subscriber line 7981, to interrupt the re
turn of ring-back tone over the connection to the calling
tending to the distributor 341 that is associated with the
' subscriber substation T1, and to reverse the polarity of
group of ?nders 360, etc.
battery over the connection between the connector 421
More particularly, the distributor 341 is governed to
and the calling subscriber substation T1; which reversal
effect the assignment of an idle one of the ?nder-selector
links, such, for example, as the link illustrated consisting 25 of battery potential over the connection noted may be
employed in the line circuit 300 individual to the calling
of the ?nder 360 and the ?rst selector 410; whereby the
subscriber line 7930, for metering purposes, in a conven
?nder 360 is operated to ?nd the calling subscriber line
tional manner, not shown. At the conclusion of the es
7930; whereby ground potential in the ?rst selector 410
tablished connection, the subscribers at the calling and
is applied to the control conductor 353 of the subscriber
line 7930 completing a circuit substantially identical to 30 called subscriber substations T1 and T2 disconnect, where
by all of the apparatus involved in the established connec
that previously traced for energizing the winding of the
tion is released and rendered available for further use.
cutoff relay R310 so as to cause the latter relay to operate.
In view of the foregoing description of the mode of
Upon operating the cutoff relay R310 completes, at the
establishing a local connection between a calling subscrib
er substation and a called subscriber substation in the
contacts 314, a substantially identical holding circuit for
energizing the winding thereof; interrupts, at the contacts
311 and 312, the connection between the upper and lower
windings of the line relay R320 and the line conductors
351 and 352 of the calling subscriber line 7930; and pre
RA6 office, it will be understood that in a substantially
identical manner local connections may be completed
between calling and called subscriber substations in the
other offices RA3, WAZ, etc.
pares, at the contacts 313, a test connection for energizing
the upper winding of the lockout relay R330. The last?
Section 4.? Operator? and intercepted calls in the R46
mentioned test connection includes the jack 355 and the
plug 356 terminating the gaseous discharge tube 357 and
is employed only in the event that the calling subscriber
line 7930 is of the second-class; and for the present pur
pose, it may be assumed that the calling subscriber line?
7930 is of the ?rst-class, whereby the plug 356 is discon
nected from the jack 355. At this time the loop circuit
In order to complete a connection from a calling sub
scriber substation in the RA6 ot?ce to the manual and
intercept operator position 423 therein, the subscriber
at the calling subscriber substation, such, for example, as
the subscriber substation T1 initiates the call and then
from the calling subscriber line 7930 is extended via the _
dials the single digit 0. Also it will be observed that the
contacts 331 and 332 and the operated ?nder 360 to the
single digits 1, 2, 4 and 8 bring about the inter
line relay in the ?rst selector 410, whereby dial tone is 50 other
ception
of the call at the manual and intercept operator
returned over the connection to the calling subscriber
position 423. Furthermore the two-digit combinations
substation T1.
71, 73, 74, 75, 76, 78, 79 and 70 bring about the inter
The ?rst selector 410 responds to the ?rst of?ce code
ception
of the call at the local and interceptor ?operator
digit 7 to select the corresponding group of second selec
tors and then to select an idle second selector in the se
55
position 423. Finally, the three-digit combinations 722,
724, 725, 728, 729 and 720 bring about the interception
lected group; for example, the ?rst selector 410 may select
of the call at the manual and intercept operator position
the trunk 414 extending to the second selector 413. The
423. This interception of the calls noted above takes
second selector 413 responds to the second office code
place by virtue ?of the circumstance that the trunks 424,
digit 2 to select the corresponding group of third selectors
and then to select an idle third selector in the selected 60 etc., extending to the position 423 commonly terminate
group; for example, the second selector 413 may select
in the ?rst, second, fourth, eighth and tenth levels of the
the trunk 416 extending to the third selector 415. The
?rst selectors 410, etc., commonly terminate in the ?rst,
third selector 415 responds to the third of?ce code digit 6
third, fourth, ?fth, sixth, eighth, ninth and tenth levels of
to select the corresponding group of fourth selectors and
the second selectors 413, etc., and commonly terminate
then to select an idle fourth selector in the selected group;
for example, the third selector 415 may select the trunk
4118 extending to the fourth selector 417. The fourth se
lector 417 responds to the ?rst numerical digit 7 to select
the corresponding group of ?fth selectors and then to
select an idle ?fth selector in the selected? group; for ex
ample, the fourth selector 417 may select the trunk 420
extending to the ?fth selector 419. The ?fth selector re
sponds to the second numerical digit 9 to select the cor
responding group of connectors and then to select an idle
connector in the selected group; for example, the ?fth
in the second, fourth, ?fth, eighth, ninth and tenth levels
of the third selectors 415, etc. The answering of a call
at the position 423 is entirely conventional and the sub
sequent release of the established connection thereto from
the calling subscriber substation T1 takes place when the
calling subscriber substation T1 disconnects.
In view of the foregoing description of operator and
intercepted calls in the RA6 of?ce, it will be understood
that similar calls in the other offices RA3, WA2, etc.,
75 may be completed in an analogous manner.
70
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