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RJ-45 Adapter Pinouts

Refer to Table D-16 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 2500 series access server. The cable you use may be a roll-over cable or a straight 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 D-8.)

Figure D-8. Identifying a Roll-Over Cable

The Cisco 2500 series access server ships with a rolled 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 D-17 for the cable and adapter configurations that can be used to connect terminals and modems to the Cisco 2500 series access server.

Table D-16. Pinouts for the RJ-45-to-DB-25 Adapters

Adapter	DTE M/F Pins [1]	DCE M/F Pins	MMOD Pins [2]
RJ-45 Pins	DB-25 Pins
1	4	5	5
2	20	6	8
3	2	3	3
4	7	7	7
5	7	7	7
6	3	2	2
7	6	20	20
8	5	4	4

^[1] The female data terminal equipment (FDTE) adapter that is available from Cisco is labeled "Terminal."

^[2] The MMOD adapter that is available from Cisco is labeled "Modem."

Table D-17. Asynchronous Device Cabling Options

Access Server Port	RJ-45 Cable Type	DB-25 Adapter	End Device
Console or auxiliary	Rolled	FDTE [1]	Terminal
Console or auxiliary	Straight	FDCE	Terminal
Auxiliary or console	Rolled	MMOD [2]	Modem [3]

^[1] The FDTE RJ-45-to-DB-25 adapter is labeled "Terminal."

^[2] The MMOD RJ-45-to-DB-25 adapter is labeled "Modem."

^[3] The asynchronous breakout cable (see Table D-15) is functionally equivalent to a roll-over cable.