Installation guide

DC 900-1537B 61
Appendix
A
Electrical Interfaces
Table A–1 shows the commonly used electrical interfaces for WAN connections. Each link in
a 2-port or 4-port ICP can be individually configured to EIA-232, EIA-449, EIA-530, or V.35.
The 8-port ICP provides EIA-232 only. If you select another value for an 8-port board, it will
be ignored.
Note
The Freeway is always Data Terminal Equipment (DTE), while
modems are Data Communications Equipment (DCE).
Table A–1: Commonly Used Electrical Interfaces
Signal Name Source
EIA-232 EIA-530 EIA-449 V.35
Mnemonic Pin Mnemonic Pin Mnemonic Pin Mnemonic Pin
Shield – –1–1–1–A
Transmitted Data DTE BA 2 BA (A) 2 SD (A) 4 103 P
BA (B) 14 SD (B) 22 103 S
Received Data DCE BB 3 BB (A) 3 RD (A) 6 104 R
BB (B) 16 RD (B) 24 104 T
Request to Send DTE CA 4 CA (A) 4 RS (A) 7 105 C
CA (B) 19 RS (B) 25
Clear to Send DCE CB 5 CB (A) 5 CS (A) 9 106 D
CB (B) 13 CS (B) 27
DCE Ready (DSR) DCE CC 6 CC (A) 6 DM (A) 11 107 E
CC (B) 22 DM (B) 29
All these are
the same:
3100/3150,
3200/7200,
1100/1150,
1200/1300