Lucent Technologies AT&T 7400B - Manual (Page 98)

APPENDIX D: QUICK-REFERENCE SUMMARIES DEFINITY Communications System
7400B Data Module
Page D-8 User’s Guide
Pin Circuit Direction Function
1
— — not used
2 BA (SD) to 7400B transmit data
3 BB (RD) from 7400B receive data
4 CA (RTS) to 7400B request to send
5 CB (CTS) from 7400B clear to send
6 CC (DSR) from 7400B data set ready
7 AB (SG) common signal ground
8 CF (RLSD) from 7400B receive line signal detector
9 —
— not used
10 — — not used
11
— — not used
12* CI from 7400B data signal rate select
13
— — not used
14
— — not used
15 — — not used
16 — — not used
17
— — not used
18 — — not used
19 — — not used
20 CD (DTR) to 7400B data terminal equipment ready
21 — — not used
22 CE (RI) from 7400B ring indicator
23* CI from 7400B data signal rate select
24 — — not used
25 — — not used
*CI on pin 12 is Bell 212A, on pin 23 is EIA-232-D
TABLE D-5 EIA-232-D PIN ASSIGNMENTS