COMSPHERE 3000 Series Carrier
B-12
December 1994
3000-A2-GA31-80
RS449 Port Interface Connector
The RS449 Port Interface connector information is
shown in Table B-6 and Figure B-9.
Table B-6
RS449 Port Interface Connector
Signal
Circuit
Mnemonic
CCITT
Number
Direction
Pin
Shield
1
Signal Ground
SG
102A
19
Receive Ground
RC
102B
20
Send Common
SC
37
Send Data
SD
103
To DCE
4 (A)
22 (B)
Receive Data
RD
104
From DCE
6 (A)
24 (B)
Request to Send
RS
105
To DCE
7 (A)
25 (B)
Clear to Send
CS
106
From DCE
9 (A)
27 (B)
Receiver Ready
RR
109
From DCE
13 (A)
31 (B)
Data Mode
DM
107
From DCE
11 (A)
29 (B)
Terminal Ready
TR
108/1, /2
To DCE
12 (A)
30 (B)
Terminal Timing
TT
113
To DCE
17 (A)
35 (B)
Send Timing
ST
114
From DCE
5 (A)
23 (B)
Receive Timing
RT
115
From DCE
8 (A)
26 (B)
Local Loopback
LL
141
To DCE
10
Remote Loopback
RL
140
To DCE
14
Test Mode
TM
142
From DCE
18
