Avaya Nortel Communication Server 1000 Reference page 327

Pin
7 Signal Ground (SG)
8 Carrier Detect (CD)
15 Serial Clock Transmit (SCT)
17 Serial Clock Receive (SCR)
18 Local Loopback (LL)
20 Data Terminal Ready (DTR)
21 Remote Loopback (RL)
23 Data Rate Selector (DRS)
24 External Transmit Clock (ETC)
25 Test Mode (TM)
Table 145: RS-422 interface pin assignments
for EIA circuits. It shows the connector pin number, the associated signal name, and the
supported circuit type. It also indicates whether the signal originates at the DTE or DCE
device.
Table 145: RS-422 interface pin assignments
Pin
1 Frame Ground (FG)
2 Transmit Data (TXa)
3 Receive Data (RXa)
4 Request to Send (RTS)
5 Clear to Send (CTS)
7 Signal Ground (SG)
8 Receive Ready (RR)
12 Receive Signal Timing (RST)
13 Transmit Data (TXb)
14 Transmit Signal Timing (TSTb)
15 Transmit Signal Timing (TSTa)
16 Receive Data (RXb)
17 Receive Signal Timing (RSTa)
20 Data Terminal Ready (DTR)
23 Terminal Timing (TTa)
Circuit Card Reference
Signal name
Signal Name
EIA circuit CCITT
circuit
AB 102
CF 109
DB 114
DD 115
LL 141
CD 108.2
RL 140
CH/CI 111/112
DA 113
TM 142
on page 327 lists RS-422 interface specifications
EIA Circuit
AA
BAa
BBa
CA
CB
AB
CF
DDb
BAb
DBb
DBa
BBb
DDa
CD
DAb
Engineering guidelines
DTE DCE
— —
X
X
X
X
X
X
X
X
X
DTE DCE
— —
X
X
X
X
— —
X
X
X
X
X
X
X
X
X
July 2011 327