Cisco RJ-45-to-AUX User Manual download pdf (Page 23)

Cable Specifications C-23

RJ-45 Adapter Pinouts

Refer to Table C-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 C-8.)

Figure C-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 C-17 for the cable and adapter conﬁgurations that can be used to connect

terminals and modems to the Cisco 2500 series access server.

Pin 1

Pin 8

H3824

Pin 1 and pin 8

should be the

same color

1 2 ... 18 19 20 21 22 23 24

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Cisco RJ-45-to-AUX User Manual Page 23