Cisco Systems NPE-225 Adapter DTE M/F Pins DCE M/F Pins Mmod Pins, Identifying a Roll-Over Cable

Chapter 5 NPE-G1 Overview

Connection Equipment and Specifications

Note When connecting to an auxiliary port on a Cisco 7200 VXR router, the port will not function at baud rates higher than 19.2k. If the baud rate on the connecting device is set higher than 19.2k, either garbled text or nothing will be displayed on the screen.

Refer to Table 5-9for 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 7200 series routers. The cable you use may be a roll-over cable or a straight cable.

Table 5-9	Pinouts for the RJ-45-to-DB-25 Adapters
Adapter		DTE M/F Pins1	DCE M/F Pins	MMOD Pins2
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”.

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 5-12.)

Figure 5-12 Identifying a Roll-Over Cable

Pin 1 and pin 8 should be the same color

Pin 1 Pin 8

H3824

Network Processing Engine and Network Services Engine Installation and Configuration

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