Cisco Systems NPE-175, NPE-225 manual Console and Auxiliary Port Connection Equipment

Chapter 5 NPE-G1 Overview

Connection Equipment and Specifications

Figure 5-11		Mode Conditioning Patch Cord
				6
	1		/ /	/ /	/ /	1
	2			Offset		9
RX	TX
3
	4	5	7	8	6	1

57011

1	Beige color identifier	6	Multimode fiber
2	To Gigabit Ethernet interface	7	Single-mode fiber
3	RX	8	Offset
4	TX	9	To cable plant
5	Blue color identifier

The mode-conditioning patch cord assembly is composed of duplex optical fibers, including a single-mode-to-multimode offset launch fiber connected to the transmitter, and a second conventional graded-index multimode optical fiber connected to the receiver. The use of a plug-to-plug patch cord maximizes the power budget of multimode 1000BASELX and 1000BASELH links.

The mode-conditioning patch cord is required to comply with IEEE standards. The IEEE found that link distances could not be met with certain types of fiber-optic cable cores. The solution is to launch light from the laser at a precise offset from the center, which is accomplished by using the mode-conditioning patch cord. At the output of the patch cord, the WS-G5486 or GBIC-LX/LH is compliant with the IEEE 802.3z standard for 1000BASELX.

Console and Auxiliary Port Connection Equipment

The NPE-G1 has a DCE-mode console port for connecting a console terminal, and a DTE-mode auxiliary port for connecting a modem or other DCE device (such as a CSU/DSU or other router) to your router. However, with an I/O controller also installed in the router, the default console and auxiliary ports are on the I/O controller, and you cannot access the console and auxiliary ports on the NPE-G1.

Note Both the console and the auxiliary ports are asynchronous serial ports; any devices connected to these ports must be capable of asynchronous transmission. (Asynchronous is the most common type of serial device; for example, most modems are asynchronous devices.)

The NPE-G1 uses RJ-45 media for console port and auxiliary port connections.

Before connecting a terminal to the console port, configure the terminal to match the router console port as follows: 9600 baud, 8 data bits, no parity, 2 stop bits (9600 8N2). After you establish normal router operation, you can disconnect the terminal.

Network Processing Engine and Network Services Engine Installation and Configuration

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