![](http://pdfasset.owneriq.net/a/99/a9933c8c-a6bf-409f-96ad-2a6a14b125dd/a9933c8c-a6bf-409f-96ad-2a6a14b125dd-bg1c3.png)
NTAK09 1.5 Mb DTI/PRI card Page 451 of 544
Option 11C and 11C Mini Technical Reference Guide
Digital pad
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 140
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