AT&T 3B2/300 Technical Reference Manual page 766

Appendix: CONNECTOR AND CABLING I N F O R M A T I O N - - - - - - - - - - - - - - - -
PIN
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
25-PIN CM195T ISC CARD SERIAL PORT CONNECTOR, J02 OR J03
(CHANNEL A IS J02, CHANNEL B IS J03)
DESCRIPTION
SIGNAL GROUND
TRANSMIT DATA (TXD)
RECEIVE DATA (RXD)
REQUEST TO SEND (RTS)
CLEAR TO SEND (CTS)
DATA SET READY (DSR)
SIGNAL GROUND
DAT A CARRIER DETECT (DCD)
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
NOT USED
TRANSMIT CLOCK INPUT(BTXCI)
NOT USED
RECEIVE CLOCK (RXC)
NOT USED
NOT USED
DATA TERMINAL READY (DTR)
NOT USED
RING INDICATOR (RI)
NOT USED
TRANSMIT CLOCK OUTPUT (TXCO)
NOT USED
LEGEND:
MFM
NC
Modified Frequency Modulation
No Connection
B-184 TECHNICAL REFERENCE MANUAL
FUNCTION
GROUND
OUTPUT
INPUT
OUTPUT
INPUT
INPUT
GROUND
INPUT
NC
NC
NC
NC
NC
NC
INPUT
NC
INPUT
NC
NC
OUTPUT
NC
INPUT
NC
OUTPUT
NC