AMERITECH AM8a, Инструкция по эксплуатации

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Appendix A – PCM Operations (18-0037) AM8a Instruction Manual
February 10, 2000 0037-S0A.L_
A-6
LOOP TIMS TRUNK INPUTS
PCM2
PCM1
!
CAUTION: 10 VOLTS MAX
TX RX
TX/2W RX
TX RX A/B
ON or OFF connection
and straight thru or
reversed TX and RX
connections to TIMS
TX/2W and RX jacks by
the TIMS ([SHIFT] [#,
ST]) key (three positions)
Internal Channel Selection
for monitoring.
channel
RX or TX Channel selected
for monitoring at AM8a
n
n
Do not Remove
Cross Connects
The AM8a IMITATE parameter
will usually be set to the end of
equipment being monitored.
MON
MON
IN IN
100
Ω
100
Ω
860
Ω
860
Ω
Use 48-0131AY cable
(to RX jack only) if
860
Ω
resistance (two
430
Ω
resistors) is not
in Monitor jack circuit.
Monitor Connections –
PCM1 shown. PCM2 monitoring would make connections to PCM2 jacks
Network Equipment
Network Equipment
Figure A-5. Monitor PCM Connection Points
A.1.2 CIRCUIT CONFIG Menu Settings
The
ANALOG/PCM
parameter will be set to:
•
1 –pcm int. clk: 1.544 Mbps clocking will originate with the AM8a from the
TX
jack to the equipment under test (Figure A–5).
•
2 –<pcm loop clk>: clocking from the equipment under test will control the
AM8a clocking via the
RX
jack.
NOTE:
With either "rpt 1 to 2" or "rpt2 to 1" drop and insert tests, the signal
with the clocking data must come into the
PCM1 RX
jack. Also refer
to
CAUTION
concerning order of jack connections.