Digital Pad - Meridian Nortel 1 Option 11C Technical Reference Manual

Page 462 of 544

Digital pad

Table 144
Digital pad values and offset allocations
Offset
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
553-3011-100 Standard 14.00
NTRB21 DTI/PRI/DCH TMDI card
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.
unassigned code, FF
January 2002
PAD set 0
0dB
2dB
3dB
4dB
5dB
6.1dB
8dB
-1dB
-3dB
-4dB
idle code, 7F
1dB
-2dB
-5db
-6db
PAD set 1
-7db
-8db
-9db
-10db
0.6db
7db
9db
10db
11db
12db
3db
14db
spare
spare
spare
spare