4 SERIAL I/O CARDS
3021M100-002
4-5
4.1.4 V.24 Serial I/O Card Signal Handling
Signaling through the V.24 Serial I/O Card’s port complies fully with the ITU-T’s
(CCITT) V.24 and the EIA-232D standards for a DB-25 connector.
* These pins are not used in the present V.24 interface.
Table 4-1 Signal Pin-Outs for V.24 I/O Port
V.24
Signal
Circuit Function EIA CCITT
DB-25
Pin No.
Signal
DTE
Direction-
DCE
PG Protective Ground (Shield) AA 101 1 n/a n/a
TXD Transmitted Data BA 103 2 Out In
RXD Received Data BB 104 3 In Out
RTS Request to send CA 105 4 Out In
CTS Clear to Send CB 106 5 In Out
DSR Data Set Ready CC 107 6 In Out
SG Signal Ground AB 102 7 n/a n/a
DCD Data Carrier Detect CF 109 8 In Out
*Reserved 9 not used not used
*Reserved 10 not used not used
*Unassigned 11 not used not used
*SCD
Secondary Received Line Signal
Detector
SCF 123 12 not used not used
*SCTS Secondary Clear to Send SCB 121 13 not used not used
*STD Secondary Transmitted Data SBA 118 14 not used not used
TXC Transmit Timing DB 114 15 In Out
*SRD Secondary Receive Data SBB 119 16 not used not used
RXC Receive Timing DD 115 17 In Out
LL Local Loopback LL 141 18 Out In
*SRTS Secondary Request To Send SCA 120 19 not used not used
DTR
Data Terminal Ready (DTE
Ready)
CD 108.2 20 Out In
RL
Remote Loopback/Signal Quality
Detector
CG 110 21 Out In
RI Ring Indicator RL 140 22 Out In
DRS Data Rate Selector CH 111 23 Out In
EXTC Terminal Timing DA 113 24 Out In
TM Test Mode TM 142 25 In Out
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