Nortel Networks 1000 - Manual (Page 971)

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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