CTC Union ETU-01A - Appendix A. I;F Specifications; E1 Line Connectors

Appendix A. I/F Specifications
117
November 2001
A.1 E1 Line Connectors
A.1.1 D-15 connector
The E1 link D-15 connector conforms to AT&T Pub 62411. The
physical interface is a 15-pin female D-type connector.
Pin Designation Direction Function
1 TTIP From ETU-01A Transmit data
2 FG ↔↔ Frame ground
3 RTIP To ETU-01A Receive data
4 FG ↔↔ Frame ground
5 -- -- --
6 -- -- --
7
Alarm relay
common
-- Alarm Relay
8
Alarm relay
normally open
-- Alarm Relay
9 TRING From ETU-01A Transmit data
10 -- -- --
11 RRING To ETU-01A Receive data
12 -- -- --
13 -- -- --
14 -- -- --
15
Alarm Relay
normally closed
-- Alarm Relay
Table A-1 E1 D-15 connector pin allocation