Appendix C. Cables
C–20
Table C–12. RS-366 Pin Assignments
MCS
Network
26-Pin
Description
Function
25-Pin #1
25-Pin #2
1
Protective ground channels 1 and 2
FGND
1
1
2
Present next digit channel 1
PND 1
5
3
Abandon call channel 1
ACR 1
3
4
Power indication 1
PW1 1
6
5
Hex digit for channel 1
NB1 1
14
6
Hex digit for channel 1
NB2 1
15
7
Pins 7, 16, and 26 are jumpered together.
8
Line occupied channel 1
DLO 1
22
9
Call request channel 1
CRQ 1
4
10
Distant connected channel 1
DSC 1
13
19
Digit present channel 1
DPR 1
2
21
Hex digit for channel 1
NB4 1
16
23
Hex digit for channel 1
NB8 1
17
11
Present next digit channel 2
PND 2
5
12
Abandon call channel 2
ACR 2
3
13
Power indication channel 2
PWI 2
6
14
Hex digit for channel 2
NB1 2
14
15
Hex digit for channel 2
NB2 2
15
17
Line occupied channel 2
DLO 2
22
18
Call request channel 2
CRQ 2
4
20
Digit present channel 2
DPR 2
2
22
Hex digit for channel 2
NB4 2
16
24
Hex digit for channel 2
NB8 2
17
25
Distant connected channel 2
DPR 2
13