BELL SYSTEM PRACTICES
AT&TCo Standard
SECTION 502-612-409
Issue 4, October 1975
SERVICE
2634DA, 2634DAM, 2635DA, AND 2635DAM TELEPHONE SETS
1. GENERAL
1.01
This section conta.ins connection and maintenance
information for 2634DA or DAM (18-button)
and 2635DA or DAM (30-button) CALL DIRECTOR®
telephone sets.
1.02
This section is reissued to:
•
Add information on 2634DAM and 2635DAM
(modular) telephone sets.
•
Add comcode numbers.
1.03
•Current nonmodular 2634DA and 2635DA
telephone sets are furnished from the factory
equipped with a G3A6 handset and cord. Modular
2634DAM and 2635DAM telephone sets are equipped
with a G15A handset H4DU handset cord, and 616E
jack assembly (Fig. 1) .•
2.
CONNECTIONS
2.01
These sets are factory-wired for use with
1A1, 1A2, or 6A KTS station line concentrators.
Refer to Division 518 for connections using 235-
or 236-type key telephone units.
2.02
A 235-type KTU is associated with each
2634-type telephone set and a 236-type KTU
with each 2635-type telephone set. Because of
the single common talking and control lead pattern
in these sets, a line concentrator KTU must be
associated with each telephone set installed and
cannot be shared, even on a bridged station basis.
2.03
The 2634DA or DAM and 2635DA or DAM
sets are equipped with a 635A5C key (5-line
pickup and hold) key in the first module position.
This may be replaced with a 635AD5C (4-line
pickup, cutoff, and hold) key. Contact strip
assemblies differ between the two keys. If ordered
for field replacement, the 635AD5C is furnished
with a piggy-back adapter, in the cut off key
position, for storing the slate mounting cord plug
associated with the fifth line. The necessary contact
strip assemblies (840151039 and 840151047) will be
shipped with the 635AD5C and will replace the
840151120 and 840151138 assemblies supplied with
the 635A5C key.
2.04
Because of the physical arrangement of the
635-type key, the contact strips do not extend
to the chaining switch. This requires additional
A1 leads to each module (except the last), to extend
A lead control.
2.05
Mounting cords of these CALL DIRECTOR
sets terminate in individual plugs 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.
2.06
All line key positions are convertible from
pickup (locking) to signaling (nonlocking).
To convert a key position to signaling, remove the
•812857738 or• P-28E773 screw detail from the key
position involved and place 840157671 insulating
details over the two key contacts adjacent to the
plunger (refer to Section 512-230-101). Make
necessary wiring changes as shown in Table A for
2634DA or DAM and Table B for 2635DA or DAM.
Note:
If more than six signaling keys are
required, replace 635G5C key in last module
with a 658A key.
2.07
The 2634DA or DAM and 2635DA or DAM
telephone sets are factory equipped with a
KS-20419L1 (10 volt ac only) buzzer.
2.08
For 3-type speakerphone operation, a 679A
transmitter may be installed in 3rd (2634DA
or DAM) or 5th (2635DA or DAM) module. For
necessary wiring changes and connections, see Table
C and Fig. 4.
NOTICE
Not for use or disclosure outside the
Bell System except under written agreement
Printed
in
U.S.A.
Page 1
BSP 502-612-409-i04_1975-10-0l.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Feb 04, 2012