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Fast Ethernet Port Cables and Pinouts
Auxiliary Port Cables and Pinouts
Use the RJ-45-to-RJ-45 rollover cable and RJ-45-to-DB-25 male DCE adapter (labeled MODEM) to
connect the auxiliary port to a modem.
auxiliary port, the RJ-45-to-RJ-45 rollover cable, and the RJ-45-to-DB-25 male DCE adapter (labeled
MODEM).
Table C-2
AUX Port (DTE)
Signal
RTS
DTR
TxD
GND
GND
RxD
DSR
CTS
Fast Ethernet Port Cables and Pinouts
The 10Base-T/100Base-TX Fast Ethernet ports support IEEE 802.3 and IEEE 802.3u specifications for
10-Mbps and 100-Mbps transmission over unshielded twisted-pair (UTP) cables. Each Fast Ethernet port
on the NPE has an RJ-45 connector to attach to Category 3 or Category 5 UTP cables.
•
•
•
•
Cisco does not supply Category 3 or Category 5 UTP RJ-45 cables; these cables are available
Note
commercially.
Identifying an RJ-45 Crossover Cable
You can identify a crossover cable by comparing the two modular ends of the cable. Hold the cables
side-by-side with the tab at the back. The first (far left) colored wire (pin 1) at one end of the cable is
the third colored wire (pin 3) at the other end of the cable. The second colored wire (pin 2) at one end
of the cable is the sixth colored wire (pin 6) at the other end of the cable. Pin 1 wire is white. See
Figure
Cisco uBR7225VXR Universal Broadband Router Hardware Installation Guide
C-4
Auxiliary Port Signaling and Cabling Using a DB-25 Adapter
RJ-45-to-RJ-45 Rollover Cable
RJ-45 Pin
1
2
3
4
5
6
7
8
Use a Category 3 UTP crossover cable when connecting 10Base-T port to a hub.
Use a Category 3 UTP straight-through cable when connecting to a PC or other Ethernet device.
Use a Category 5 UTP crossover cable when connecting 100Base-TX to a hub.
Use a Category 5 UTP straight-through cable when connecting to a PC or other Ethernet device.
C-3.
Table C-2
lists the signals and pinouts for the asynchronous serial
RJ-45-to-DB-25
Modem Adapter
RJ-45 Pin
DB-25 Pin
8
4
7
20
6
3
5
7
4
7
3
2
2
8
1
5
Appendix C
Cable Specifications
Modem (DCE)
Signal
RTS
DTR
TxD
GND
GND
RxD
DCD
CTS
OL-17309-01
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Troubleshooting
