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Refer to Table 1 for a list of the pins used on the RJ-45-to-DB-25 adapters, used with an RJ-45 cable, to connect terminals and
modems to the Cisco 7201 router. The cable you use may be a roll-over cable or a straight-through cable.
A roll-over cable can be detected by comparing the two modular ends of the cable. Holding the cables in your hand, side-by-side,
with the tab at the back, the wire connected to the pin on the outside of the left plug should be the same color as the pin on the
outside of the right plug. If your cable was purchased from Cisco, pin 1 will be white on one connector, and pin 8 will be white
on the other (a roll-over cable reverses pins 1 and 8, 2 and 7, 3 and 6, and 4 and 5). (See Figure 10.)
Figure 10 Identifying a Roll-Over Cable
The Cisco 7201 router ships with a roll-over cable. Connection to a terminal or a modem will require an RJ-45-to-DB-25
adapter, and possibly a DB-25-to-DB9 adapter. Refer to Table 2 for the cable and adapter configurations that can be used to
connect terminals and modems to the Cisco 7201 router.
Table 1 Pinouts for the RJ-45-to-DB-25 Adapters
Adapter DTE M/F Pins
1
1. The female data terminal equipment (FDTE) adapter that is available from Cisco is labeled “Terminal”.
DCE M/F Pins MMOD Pins
2
2. The MMOD adapter that is available from Cisco is labeled “Modem”.
1455
22068
3233
4777
5777
6322
762020
8544
1
Pin 1
3
Pin 8
2
Pin 1 and pin 8 should be the same color
84532
1 3
2