Nortel Networks 1000 User Manual
Page 393
Engineering guidelines
393
Table 158
RS-232 interface pin assignments (cont’d.)
Pin
Signal name
EIA
circuit
CCITT
circuit
DTE
DCE
5
Clear to Send (CTS)
CB
106
X
6
Data Set Ready (DSR)
CC
107
X
7
Signal Ground (SG)
AB
102
—
—
8
Carrier Detect (CD)
CF
109
X
15
Serial Clock Transmit (SCT)
DB
114
X
17
Serial Clock Receive (SCR)
DD
115
X
18
Local Loopback (LL)
LL
141
X
20
Data Terminal Ready (DTR)
CD
108.2
X
21
Remote Loopback (RL)
RL
140
X
23
Data Rate Selector (DRS)
CH/CI
111/112
X
24
External Transmit Clock (ETC)
DA
113
X
25
Test Mode (TM)
TM
142
X
Table 159 "RS-422 interface pin assignments" (page 393)
lists RS-422
interface specifications 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 159
RS-422 interface pin assignments
Pin
Signal Name
EIA
Circuit
DTE
DCE
1
Frame Ground (FG)
AA
—
—
2
Transmit Data (TXa)
BAa
X
3
Receive Data (RXa)
BBa
X
4
Request to Send (RTS)
CA
X
5
Clear to Send (CTS)
CB
X
7
Signal Ground (SG)
AB
—
—
8
Receive Ready (RR)
CF
X
12
Receive Signal Timing (RST)
DDb
X
13
Transmit Data (TXb)
BAb
X
14
Transmit Signal Timing (TSTb)
DBb
X
15
Transmit Signal Timing (TSTa)
DBa
X
16
Receive Data (RXb)
BBb
X
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.