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TO
SBKTS
Fig. 4-Modification of 502/2502 BM Telephone Set for Use With 68 Key Telephone System
with a 2A transmitter-receiver adj unct. The cord
of the adjunct can be wired directly to the telephone
set terminals or to a separately supplied 66E8-25
connecting block.
required to power each adj unct.
typical adjunct to telephone connections. For further
information on the 2A transmitter-receiver, refer
to Section 518-010-115.
Note:
Tip and ring
be reversed for proper operation of S HOLD.
OFF-PREMISES EXTENSIONS
Off-premises extensions from the 6 B KTS
3 . 1 6
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.
BSP 518-411·100 ·i01 1978·08·15. jpg
DSAL OR
S35A
OSA,.,
CONN BLK
CORD
5
T
�
�
4
R
�
3
A
�
�
S
A1
�
�
�
7
BZ1
�
NOTES:
1 . RE,.,O V E ( 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 . 1 0 V AC BUZZER ,.,UST BE SEPERATELY ORDERED
AND INSTALLED.
A 2012B transformer is also
Fig. 6 shows
to the adjunc t
Scanned by Frank Harrell, Cowboy Frank) Castle Rock, Colorado Oct 15, 2012 20:59:38
TELEPHONE SET
( NOTES 1 AND 2 )
2
( G )
1
( R )
5
(BK)
( Y )
(BL )
4
( W )
4.
OPERATION-STANDARD FEATURES
INTERCOM LINE PICKUP AND HOLD
Intercom calls are originated by depressing
4.01
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,
must
unless special features such as conferencing, call
add-on, or override are used.
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).
To make a station-to-station intercom call:
4.02
(1) Depress line pickup button associated with
intercom.
Note:
system is busy and no links are available.
ISS 1 , SECTION 5 1 8-4 1 1 - 1 00
F
( G )
L2
LS
( R )
( G )
( W )
( BR )
LS
( Y )
AC
( NOTE 3 )
Intercom calls are
Button should be dark-if lit steady,
Page 1 5
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