Owner's manual

Architecture 971
Table 406
Digital pad values and offset allocations (cont’d.)
Offset
PAD set 0 PAD set 1
A idle code, 7F 3db
B unassigned code, FF 14db
C 1dB
spare
D –2dB
spare
E –5db
spare
F –6db
spare
The digital pad is an EPROM whose address-input to data-output transfer
function meets the characteristics of a digital attenuator. The digital
pad accommodates both µ255-law and A-law coding. There are 32
combinations each for µ255 to µ255, µ255 to A-law, A-law to µ255, and
A-law to A-law. These values are selected to meet the EIA loss and level
plan.
Table 407
Digital pad values and offset allocations
Offset
PAD set 0 PAD set 1
0
0dB -7db
1
2dB -8db
2
3dB -9db
3
4dB -10db
4
5dB 0.6db
5
6.1dB 7db
6
8dB 9db
7
-1dB 10db
8
-3dB 11db
9
-4dB 12db
A idle code, 7F 3db
B unassigned code, FF 14db
C 1dB
spare
D -2dB
spare
E -5db
spare
F -6db
spare
The digital pad is an EPROM whose address-input to data-output transfer
function meets the characteristics of a digital attenuator. The digital
pad accommodates both Mu255-Law and A-Law coding. There are 32
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
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