>From the 1988 Plessey Telecoms IC Handbook pp 198-202

1       Shaping
2       Gain Tap 1
3       Gain Tap 2
4       n/c
5       n/c
6       Gain Tap 3
7       Line
8       Line
9       Bias
10      n/c
11      Substrate
12      n/c
13      -ve input
14      +ve input