3Com MSR 50 Series Configuration Manual page 801

cables, which are blue, are for telecom carriers. "Bank" means that the 8AS/16AS
(RJ-45) cables which are white and labeled with "Dumb Terminal" are used for
terminal access in banks.
The following table describes the pins of 8AS/16AS cables.
Serial
interfa
ce DB-25 DB-9
Asynchr 5 8
onous
6 6
serial
interfac 3 2
e
7 5
8 1
2 3
20 4
4 7
Terminal access converters are exclusively used for 8AS cables (RJ-45 for banks)
and 16AS cables (RJ-45 for banks) to connect to terminals. One end of the cable is
an RJ-45 receptacle for connecting to a standard network cable, and the other end
is a DB-25 receptacle for connecting to a terminal. The following table describes
the pins of the terminal access converter.
RJ-45 (female)
1
2
3
4
5
6
7
8
The common terminal access connection in banking systems is shown in the
following figure.
Terminal Access Troubleshooting
RJ-45 (for
telecom/banks) Signal
8 / 7 CTS
7 / 3 DSR
6 / 5 RxD
5 / 4 GND
4 / 1 DCD
3 / 6 TxD
2 / 2 DTR
1 / 8 RTS
DB-25 (female)
8
6
20
7
2
3
4
5
801
Signal Signal
direction description
І Clear to send
І Data set ready
І Receive data
- Logical ground
І Data carrier detect
Ðü Transmit data
Ðü Data terminal
ready
Ðü Request to send
Signal
DCD
DSR
DTR
GND
TxD
RxD
RTS
CTS