TB 9-6625-2138-35
NOTE
If block error light is not lit set loop switch to loop and back to
off.
(4) Set LINE switch to OFF.
(5) Short pins on A15J1 connector on rear panel (DATA INTERFACE board
RS232 or RS232C) as listed in (a) through (c) below:
(a) Pin 4 to pin 5.
(b) Pin 6 to pin 20.
(c) Pin 8 to pin 19.
(6) Set LINE switch to ON. TI indications will be as listed in (a) through (h) below.
(a) OUT of LOCK on.
(b) LOSS OF DATA on.
(c) DATA SET READY on.
(d) CLEAR TO SEND off.
(e) TEST ON off.
(f) BIT ERROR on.
(g) CARR LOSS on.
(h) CLK SLIP off.
(7) Set DTR/RTS/BACKWARD CHANNEL switch to RTS. CLEAR TO SEND
indicator will be on.
(8) Set DTR/RTS/BACKWARD CHANNEL switch to BACKWARD CHANNEL.
CARR LOSS indicator will be off.
(9) Set LINE switch to OFF and remove shorts installed in (5) above.
(10) Set DTR/RTS/BACKWARD CHANNEL switch to DTR.
(11) Set LINE switch to ON.
(12) Connect differential voltmeter between pin 4 of A15J1 connector on rear panel
and chassis ground. Differential voltmeter indication will be between -5 and -12 V.
(13) Set DTR/RTS/BACKWARD CHANNEL switch to BACKWARD CHANNEL.
Differential voltmeter indication will be between +5 and +12 V.
(14) Adjust pulse generator for oscilloscope indication as shown in figure 5A, and
connect pulse generator output to BACKWARD CHANNEL DATA connector (rear panel).
(15) Connect oscilloscope between pin 14 of A15J1 connector on rear panel (RS232C
DATA INTERFACE) and
chassis ground.
Oscilloscope indication will be as
shown in
13