Here's a closeup of the two halves of the socket strip (shown separately to fit the page better):
Pin | Signal | Conn | Function | Pin | Signal | Function |
1 | bnc1 | J1-1 BNC 1 | 28 | nc | No connection | |
2 | bnc2 | J1-2 BNC 2 | 29 | nc | No connection | |
3 | bnc3 | J1-3 BNC 3 | 30 | nc | No connection | |
4 | ph1l | J1-4 Phone Plug 1 left | 31 | nc | No connection | |
5 | ph1r | J1-4 Phone Plug 1 right | 32 | nc | No connection | |
6 | ph2l | J1-5 Phone Plug 2 left | 33 | nc | No connection | |
7 | ph2r | J1-5 Phone Plug 2 right | 34 | nc | No connection | |
8 | ph3l | J1-6 Phone Plug 3 left | 35 | nc | No connection | |
9 | ph3r | J1-6 Phone Plug 3 right | 36 | nc | No connection | |
10 | ear1 | J1-7 Handset earpiece | 37 | nc | No connection | |
11 | ear2 | J1-7 Handset earpiece | 38 | nc | No connection | |
12 | mic1 | J1-7 Handset microphone | 39 | nc | No connection | |
13 | mic2 | J1-7 Handset microphone | 40 | nc | No connection | |
14 | gnd | Ground | 41 | gnd | Ground | |
15 | sound_mic | J2-1 microphone | 42 | ach0 | input0 | |
16 | sound_spkrl | J2-1 speaker left | 43 | ach1 | input1 | |
17 | sound_spkrr | J2-1 speaker right | 44 | ach2 | input2 | |
18 | sound_lin_inl | J2-1 line in left | 45 | ach3 | input3 | |
19 | sound_lin_inr | J2-1 line in right | 46 | ach4 | input4 | |
20 | sound_lin_outl | J2-1 line out left | 47 | ach5 | input5 | |
21 | sound_lin_outr | J2-1 line out right | 48 | ach6 | input6 | |
22 | gnd | Ground | 49 | ach7 | input7 | |
23 | ph4l | J2-2 Phone Plug 4 left | 50 | nc | No connection | |
24 | ph4r | J2-2 Phone Plug 4 right | 51 | dac0 | output 0 | |
25 | bnc1 | J2-3 BNC 4 | 52 | dac1 | output 1 | |
26 | bnc2 | J2-4 BNC 5 | 53 | nc | No connection | |
27 | bnc3 | J2-5 BNC 6 | 54 | nc | No connection |