TO
SBKTS
S35A
CONN BLK
T
5
�
R
4
A
3
�
A1
S
�
BZ1
7
NOTES:
DSAL OR
OSA,.,
CORD
�
(G)
�
(R)
(BK)
�
( Y )
�
�
(BL )
�
(W)
ISS 1 , SECTION 5 1 8-4 1 1 - 1 00
TELEPHONE SET
( NOTES 1 AND 2 )
F
2
(G)
1
(R)
L2
( G )
LS
(W)
5
( BR )
LS
( Y )
4
AC
( NOTE 3 )
1 . RE,.,OVE ( BK ) RINGER LEAD FRO,., TER,.,INAL 2 AND (S) STRAP FRO,., TER,.,INAL 1 .
INSULATE AND STORE.
2. RE,.,OVE (BK) EXCLUSION KEY LEAD FRO,., L1 AND ( Y ) FRO,., L2 OF NETWORK .
INSULATE AND STORE .
3 . 10V AC BUZZER ,.,UST BE SEPERATELY ORDERED
AND INSTALLED.
Fig. 4-Modification of 502/2502 BM Telephone Set for Use With 68 Key Telephone System
with a 2A transmitter-receiver adjunct. The cord
of the adjunct can be wired directly to the telephone
set terminals or to a separately supplied 66E8-25
connecting block.
A 2012B transformer is also
required to power each adjunct.
Fig. 6 shows
typical adjunct to telephone connections. For further
information on the 2A transmitter-receiver, refer
to Section 518-010-115.
Note:
Tip and ring
to the adjunct
must
be reversed for proper operation of S HOLD.
OFF-PREMISES EXTENSIONS
3 . 1 6
Off-premises extensions from the 6 B KTS
can be provided using a 420A KTU (long
line circuit). The maximum station conductor loop
is 500 ohms. A separate mounting must be provided
for the 420A KTU(s). For one or two circuits, use
a llOA apparatus mounting-for a larger number
of circuits use a 642A panel. The necessary voltages
can be obtained from the associated key system if
sufficient capacity is available. Connections for an
off-premises station are shown in Fig. 36.
4.
OPERATION-STANDARD FEATURES
INTERCOM LINE PICKUP AND HOLD
4.01
Intercom calls are originated by depressing
the designated button on the telephone set.
Only one button appearance is required in either
single link or multilink systems. Only the calling
and called stations enter into an intercom call,
unless special features such as conferencing, call
add-on, or override are used. Intercom calls are
processed through the controller circuit (485A KTU)
with tones supplied by the service circuit (486A
KTU) and talk battery by the battery feed circuit
(487A KTU).
4.02
To make a station-to-station intercom call:
(1) Depress line pickup button associated with
intercom.
Note:
Button should be dark-if lit steady,
system is busy and no links are available.
Page 1 5
BSP 518-411·100·i01 1978·08·15.jpg Scanned by Frank Harrell, Cowboy Frank) Castle Rock, Colorado Oct 15, 2012 20:59:38
