AMERITECH AM8a, Инструкция по эксплуатации

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Configuration Parameters (18-0037) AM8a Instruction Manual
February 10, 2000 0037-S02.L_
2-4
rpt 2 to 1:
is used during Drop & Insert testing. This mode will allow the selected
CHAN
nel to be used for emulation towards the equipment connected to the
PCM2
input
jacks; other channels are uninterrupted to
PCM1
.
NOTE:
In
MONITOR
mode all channels pass from
PCM1
to
PCM2
when
rpt 1 to 2
or
rpt 2 to 1
are selected. See Section 6 for metering the a and b bits to find an
idle channel that can be selected for drop and insert testing.
In Drop & Insert testing, the equipment which supplies the "Master" clock
for framing must be connected to the
PCM1
input jack.
2.3.2
FRAMING:
This parameter selects the span framing type assignment that the AM8a can
emulate and monitor.
D3/D4:
is the most popular type of framing. It uses 12 separate frames in a super-
frame. The signaling bits are identified as "a" and "b" bits.
ESF:
Extended SuperFrame is another popular type of framing. This type uses 24
frames rather than 12 frames. Its signaling bits are" a, b, c, and d".
SLC®96 I:
(
SLC® 96 Mode I
) monitors 96 channels or data link on four spans (A, B, C,
and D). Assignment of channels to time-slots is fixed. Refer to Table 6-5 for these
assignments.
SLC®96 II:
(
SLC®96 Mode II
) monitors 96 channels or data link on two spans (A and C).
Assignment of channels to time-slots is on as-available basis. Refer to 2.5.4 for use of
activity message to determine line groups and active channels.
NOTE:
SLC®96 I
and
SLC®96 II
can only be used in monitor mode.
2.3.3
ZERO SUP:
Zero Suppression is the way that the AM8a handles a data pattern of all
"0's" during transmission.
AMI:
(Alternate Mark Inversion) is the standard protocol for T1 spans.
AMI
does not
supply any zero suppression conversions.
B8ZS:
(Binary Eight Zero Suppression) will insert two bipolar violations when eight
consecutive zeros are encountered. The receiving equipment will recognize this and
remove the BPV's and correctly interpret the data.