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Basic Setup Activities for Access Serving
Six-Wire Cabling
Communication
Server Connector
Female RJ-45
Male RJ-45
Connector
Connector
RING
1
1
DTR
2
2
XMT
3
3
XMTGND
4
4
RCVGND
5
5
RCV
6
6
DCD
7
7
Not used
8
8
2-4
The 6-wire cabling scheme provides XMT, RCV, DCD/DSR, DTR, RING, and
separate transmit and receive ground wires. This cabling is provided through
RJ-45 connectors (pin 8 of the connector is not used). Using this cabling
scheme, you can use either modem control or hardware flow control, but not
both, because there are only three control signals.
This scheme is useful with the following applications:
•
Terminal emulation and file transfer applications, such as Kermit,
Xmodem, Microphone, and so on (cabling shown in
•
Applications such as SLIP and PPP using low-speed modems (modem
control or DCD/DSR enabled and cabling shown in
•
Applications such as SLIP and PPP using high-speed modems (RTS/CTS
flow control enabled and cabling shown in
•
Applications using CCITT V.42-compliant modems or other devices
operating at high port speeds
Figure 2-1
is a wiring diagram that shows the cabling needed to connect a
communication server serial port to a modem for most standard applications
(i.e., those that do not require RTS/CTS hardware flow control).
shows the wiring for applications that require RTS/CTS flow control.
Straight Through Cable
Male RJ-45
Connector
1
2
3
4
5
6
7
8
Straight Through Cable
Figure 2-1.
Modular cables for connecting a modem (6-wire port)
Figure
Modular Adapter
Female RJ-45
Male DB-45
Connector
Connector
1
2
3
4
5
6
7
8
Adapter Wiring
(Female RJ-45 to Male DB-25)
Figure
2-1)
Figure
2-1)
2-2)
Figure 2-2
To
Modem
Modem Connector
Pin Signal
RING
22
DTR
20
XMT
2
GND
7
RCV
3
DCD
8
DSR
6
RTS
4
5
CTS
4897
893-826-A
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