AMERITECH AM8a Instruction Manual page 39

Configuration Parameters
rpt 2 to 1: is used during Drop & Insert testing. This mode will allow the selected
CHANnel 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.
February 10, 2000
(18-0037)
2-4
AM8a Instruction Manual
0037-S02.L_