Specifications

Rev. 1.2 5–1
Chapter 5. CONNECTOR PINOUTS
Table 5-1. Data Connector - 25 Pin ‘D’ Type Female
Pin Generic Signal description Direction
EIA-422/
EIA 530
V.35 EIA-232
Circuit
No
1 Shield - Shield FG AN 101
2 Transmit Data A DTE to Modem SD A SD A BA 103
3 Receive Data A Modem to DTE RD A RD A BB 104
7 Signal Ground - SG SG AB 102
8 Receiver Ready A Modem to DTE RR A RLSD * CF 109
9 Receive Clock B Modem to DTE RT B SCR B - 115
10 Receiver Ready B Modem to DTE RR B - - 109
11 Transmit Clock B DTE to Modem TT B SCTE B - 113
12 Internal Transmit Clock B Modem to DTE ST B SCT B - 114
14 Transmit Data B DTE to Modem SD B SD B - 103
15 Internal Transmit Clock A Modem to DTE ST A SCT A DB 114
16 Receive Data B Modem to DTE RD B RD B - 104
17 Receive Clock A Modem to DTE RT A SCR A DD 115
23
External Carrier Off
(EIA-232 ‘1' or TTL ‘low’ )
DTE to Modem - - - -
24 Transmit Clock A DTE to Modem TT A SCTE A DA 113
NOTES:
* Receiver ready is an EIA-232-level control signal on a V.35 interface
‘B’ signal lines are not used for EIA-232 applications
For X.21 operation, use the EIA-422 pins, but ignore Receive Clock if the Modem is DTE, and ignore Transmit clocks if the
Modem is DCE