BELL SYSTEM PRACTICES
AT& TCo Standard
SECTION 502-61 2-410
Issue 4, March 1975
SERVICE
2636CA AND 2637DA TELEPHONE SETS
1.
GENERAL
1.01
This section contains connection and maintenance
information for 2636CA (18-button) and 2637DA
(30-button) CALL DIRECTOR® telephone sets
equipped with headset jacks.
1.02
This section is reissued to:
•
Change contact strip assembly 840151947 to
840151047, 2.02
•
Add information on D-180463 Kit of Parts,
2.08 and Fig. 3
•
Revise 2.05
2.
CONNECTIONS
2.01
These sets are factory-wired for use with
1A1, 1A2, or 6A KTS line circuits. They
may also be used with 1A KTS line circuits by
modifying the set as shown in Tables A and B.
Line circuits for 1A, 1A1, or 1A2 KTS may be
connected to the same set under the following
conditions:
(a) 1A1 or 1A2 KTS lines must be connected
to the first key units with 1A lines connected
to supplementary key modules.
(b) 1A, 1A1, or 1A2 KTS lines should not be
connected to the same 6 line key module.
(c) 1A, 1A1, or 1A2 KTS lines appearing behind
a m a n u a l s w i t c h b o a r d s h o u ld n o t b e
intermixed o n a CALL DIRECTOR telephone set
due to the different time out intervals provided
by the associated KTU's.
2.02
These sets are equipped with a 635A5C (5-line
pickup and hold) or a 635AD5C (4·\ine pickup,
cutoff, and hold) key in the first module position.
Contact strip assemblies [required with sets equipped
with a D120K (MD) or D200S (MD) mounting cord]
differ between the two keys. If ordered for field
replacement, the 635AD5C key is furnished with a
piggy-back adapter to which the slate mounting
cord plug is connected. The necessary contact strip
assemblies (840151039 and •840151047• ) will be
shipped with the 635AD5C key, and will replace
the 840151120 and 840151138 assemblies supplied
with the 635A5C key.
2.03
Because of the physical arrangement of the
635-type key, the contact strips do not extend
to the chaining switch. This requires a second tip
and ring conductor to each module (except the
last). See Fig. 2, sheets 1 through 5.
2.04
The line conductors of the mounting cords
for these sets terminate in individual plugs
on a per line basis and are connected to the rear
of the keys. This permits rearrangement of line
appearances either in the set or at the key equipment
distribution point. Current production sets are
equipped with a satin-silver (-87) mounting cord.
2.05
All line pickup key positions are convertible
to signaling or common signaling arrangements
by removing the P-28E773 screw detail from key
positions involved and making the necessary wiring
changes per Table C.
2.06
These sets are not intended for use with
3-type speakerphone systems.
2.07
The 2636CA and 2637DA telephone sets are
factory equipped with a KS-20419L1 (10 volt
AC only) buzzer.
2.08
When station busy lamp feature is required
with these sets having 1A1 or 1A2 KTS line
circuits, there are two optional circuits available.
The busy lamp(s) will light whenever a line pickup
button is depressed and the handset is off-hook or
the headset is plugged into the jacks. This optional
equipment must be ordered separately. If more
than one busy lamp is required, a 6C KTU must
be connected as shown in Fig. 5. For a single
busy lamp, •install a D-180463 Kit of Parts (ordered
separately), consisting of a P-90D033 Printed Wiring
Board Assembly and 840361836 plug assembly (light
beige).. Connect kit of parts as shown in Fig. 3.
© American Telephone and Telegraph Company,
1975
Printed in U.S.A.
Page 1
SSP 502-612-410-i04_1975-03-0l.jpg Scanned by Frank Harrell, {Cowboy Frank) Castle Rock, Colorado Feb 04,2012 16:18:38
