Installation manual

COMSPHERE 3000 Series Carrier
B-6 March 2001 3000-A2-GA31-F0
The async terminal connection uses the:
• COM port-to-terminal/printer cable. This cable is a
14-foot, 26 AWG 8-conductor cable with an
8-position modular plug keyed connector and a
DB25 plug connector (see Figure B-7).
• COM port adapter connector with an 8-position
keyed modular jack (see Table B-4). The data
signals on this port are referenced to a DTE
interface.
1
2
3
4
5
6
7
8
496-14154-03
8-Position
Modular
Plug Keyed
RX Data
Ground
TX Data
DTR
CD
RTS
15
3
7
2
20
8
5
6
4
17
RX Data
Ground
TX Data
DTR
CD
CTS
DSR
RTS
DB25
Plug
Figure B-7. COM Port-to-Terminal/Printer Cable
Table B-4
COM Port Adapter Connector (J6)
Signal
To/From Pin #
Reserved for future use to DTE (Out) 1
DCE Received Data to DTE (Out) 2
SIGNAL Ground

3
DCE Transmit Data from DTE (IN) 4
DCE Data Terminal Ready from DTE (IN) 5
DCE Carrier Detect to DTE (Out) 6
DCE Request to Send from DTE (IN) 7
Reserved for future use to DTE (Out) 8
Port Interfaces
The port interface connectors (T1 DSU/CSU only)
include the EIA-530-A DB25 connector. The V.35
connector and the RS-449 connector require an adapter
cable.
EIA-530-A DB25 Port Interface Connector
The EIA-530-A Port Interface connector information is
shown in Table B-5.
Table B-5
EIA-530-A Port Interface Connector
Signal
Circuit
Label
ITU #
To/
From
Pin
#
Signal Common AB 102A

7
Signal Common AC 102B

22, 23
Transmitted Data BA 103 To
DCE
2 (A)
14 (B)
Received Data BB 104 From
DCE
3 (A)
16 (B)
Request to Send CA 105 To
DCE
4 (A)
Clear to Send CB 106 From
DCE
5 (A)
13 (B)
Received Line
Signal Detector
CF 109 From
DCE
8 (A)
10 (B)
DCE Ready CC 107 From
DCE
6
DTE Ready CD 108/1, /2 To
DCE
20
Transmit Signal
Element Timing –
DTE Source
DA 113 To
DCE
11 (A)
24 (B)
Transmit Signal
Element Timing –
DCE Source
DB 114 From
DCE
12 (A)
15 (B)
Receiver Signal
Element Timing –
DCE Source
DD 115 From
DCE
17 (A)
9 (B)
Local Loopback LL 141 To
DCE
18
Remote
Loopback
RL 140 To
DCE
21
Test Mode TM 142 From
DCE
25