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-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
CHAN
nel 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