Nortel Circuit Card 311 Reference page 977

The incoming serial bit stream is converted to 8-bit parallel bytes to be
directed to padding control. The signaling bits are extracted and inserted
by the A07 signaling interface circuitry. Timeslots 0 and 16 are currently
unused for PCM.
Digital PAD
The software selects A-Law or µ-Law and one of 32 possible PAD values
for each channel. These values are provided in a PROM through which the
data is routed. The idle code for A-Law is 54H and for µ-Law is 7FH. The
unequipped code is FFH for both A-Law and µ-Law.
As the idle code and unequipped code can be country dependent, the
software instructs the NTBK50 to use different codes for each direction. The
32 digital pads available are illustrated in
offset allocations" (page
(1.0dB is 1 dB of loss and –1.0 dB is 1 dB of gain.
Table 405
Digital Pad - values and offset allocations
PAD SET 0
Offset
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Copyright © 2003-2008, Nortel Networks
.
977). The values shown are attenuation levels
PAD
0.6 dB
1.0 dB
2.0 dB
3.0 dB
4.0 dB
5.0 dB
6.1 dB
7.0 dB
8.0 dB
9.0 dB
10.0 dB
11.0 dB
12.0 dB
13.0 dB
14.0 dB
spare
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Table 405 "Digital Pad - values and
PAD SET 1
Offset
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 Unassigned Code
Architecture 977
PAD
0.0 dB
-1.0 dB
-2.0 dB
-3.0 dB
-4.0 dB
-5.0 dB
-6.0 dB
-7.0 dB
-8.0 dB
-9.0 dB
-10.0 dB
spare
spare
spare
Idle Code