Appendix A – PCM Operations (18-0037) AM8a Instruction Manual
February 10, 2000 0037-S0A.L_
A-8
• 3 –rpt2 to 1: circuitry of AM8a is connected to provide a path from PCM1 to
PCM2 jacks (RX to TX) in both directions. In emulate mode, a single T1 voice
channel may be dropped from the other 24 channels for tests. For the selected
channel (see Figures A-3 and A-6):
• TX path toward PCM1 is idled; RX path from PCM1 is ignored.
• TX path toward PCM2 is emulated; RX path from PCM 2 is analyzed.
• FRAMING parameter is set to D3/D4 or ESF for T1 lines. It is set to SLC®96 I
or SLC®96 II if SLC®96 lines are being monitored.
CAUTION: When FRAMING is set for SLC®96 circuits, the E & M/SLC®
LED indicator will be flashing. AM8a must also be in
MODE monitor and INPUT pcm1 or pcm2 for tests of
SLC®96 circuits.
The ZERO SUP parameter is set to AM1, B8ZS, or ZCS to match the equipment under
test.
The CHANnel parameter:
• For T1 lines: the parameter must be set to 1 through 24. This setting determines
which time-slot/voice channel will be accessed for emulation (emulation and
analysis), monitoring (analysis only), or repeat (emulation and analysis on one
channel while leaving other channels uninterrupted.).
• For monitor of any lines (or "spans"): the parameter may be set to 0. This will
cause the unit to automatically monitor whichever time-slot first goes active.
• For SLC®96 I monitor: the parameter may be set to time-slot 1 to 24 or voice
channel –1 to –96. The user must select a channel appropriate to the span:
A = –1 to –24, B = –25 to –48, C= –49 to –72, and D = -73 to –96
(Refer to Table 6-5 for the fixed voice channel to time-slot assignments).
• For SLC®96 II monitor: the parameter may be set to -1 to -96 to monitor a
channel. In SLC®96 Mode II, 96 lines are allocated as time-slots become
available, but the user must still select an appropriate channel for the span being
input to the AM8a:
A = –1 to –48, C = –49 to –96
To Next Page