BELL SYSTEM PRACTICES
AT
&
TCo Standard
SECTION 502-612-4 1 0
Issue 5, April 1976
SERVICE
2636CA, 2636CAM, 2637DA, AND 2637DAM TELEPHONE SETS
1.
GENERAL
1.01
This section contains connection and maintenance
information for 2636CA (MD), CAM (18-button)
and 2637DA (MD), DAM (30-button) CALL
DIRECTOR® telephone sets equipped with headset
jacks.
1.02
This section is reissued to:
•
Add information on 2636CAM and 2637DAM
(modular) telephone sets
•
Show the 2636CA and 2637DA telephone
sets MD.
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 manual switchboard should not be
intermixed on 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-line pickup,
cutoff, and hold) key in the first module position.
Contact strip assemblies [required with sets equipped
with a Dl20K (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 •812857738• (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
speakerphone systems.
2.07
The 2636CA, CAM and 2637DA, DAM
telephone sets are factory equipped with a
KS-2041911 (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
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed in U.S.A.
Scanned oy Fran< Harrell, (Cowboy Frank) Castle Rock, Colorailo Oct OS, 2012 16:38:41
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