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D
CD
CD
LEAD
DESIG
BR
BYl
CGl
CGO
Dl
DO
ILl
IL2
IRl
ITl
IR2
IT2
LF2
TABLE
Y
LEAD TABLE-I N T E R COM CIRCUIT
FUNCTION
Switched B battery - when 424B/424C KTU is seized, this lead applies -24V B to
460B KTU to start intercom dial tone.
Busy ground - applies ground after completion of dialing to enable the 2nd station
detect circuit in the 460B KTU and start intercom ringing in the 456B KTU.
Counter ground - applies ground to counting relays in 424B/424C either by M
option strap or via DSS console Q option on non-TOUCH TONE calls.
Counter ground - provides ground to counting relays (Yl-Y5) from RS2 lead (M
option) or via 440A or 478B (N option) or via CGO and CGl leads of DSS console
(Q option) .
Off-hook detection - selector seizure output from 460B KTU (M option) o r t o DO
output of 460B via DSS console (Q option) . If call is rotary dialed, Dl is also the
dial pulse input from the 460B.
Dialing output - ground supply for talk battery when a path is seized; also, the
seizure input for the 424B/424C selector by way of lead Dl if DSS is not provided
(M option) or if provided (Q option) by way of the DSS console.
Intercom lamp 1 - lamp circuit for path 1 to station 0 and 3-19.
Intercom lamp 2 - lamp circuit for path 2 to station 0 and 3-19 .
Intercom ring 1 - ring side of path 1 .
Intercom tip 1 - tip side of path 1 .
Intercom ring 2 - ring side o f path 2.
Intercom tip 2 - tip side of path 2 .
Intercom flash - 60 IPM signal from the interrupter applied t o all tel sets during the
period an intercom path is seized until call is answered and selector is released.
KTU/CONN ECTOR
PIN NUMBER
Jl0-35
J12-35
Jl0-19
J12-19
J16-19
J14-26
Jl0-21
Jl0-16
J12-16
J12-8
Jll-16
J12-14
J12-34
J12-0
J12-1
J12-7
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