Connecting Gigabit Ethernet Network Modules

This chapter describes how to connect Gigabit Ethernet network modules for modular access routers and contains the following sections:

Tip

To determine whether your router supports a specific network module, see Table 1-6 on page 1-16.

Gigabit Ethernet Network Modules

The Gigabit Ethernet network module provides single-port Gigabit Ethernet connectivity through an installed Gigabit interface converter (GBIC). The GBIC determines the type of connectivity available to the network module. (See Figure 21-1.)

Note 1000BASE-T ports cannot be looped back through use of an external loopback cable.

Table 21-1 Gigabit Ethernet Connection and Cable Types Supported on Gigabit Ethernet Network Modules
GBIC Part Number	GBIC Description	Required Cable Specifications
GBIC-ZX=	Extended distance 1000BASE-ZX	10-micron SMF cable (yellow) with SC connectors¹
GBIC-LX/LH=	Long-wavelength or long-haul 1000BASE-LX/LH	10-micron SMF cable (yellow) with SC connectors 1 Tip If using an MMF cable, install a mode-conditioning patch cord (CAB-GELX-625).
GBIC-SX=	Short-wavelength 1000BASE-SX	62.5-micron MMF cable (orange) with SC connectors
GBIC-T=	UTP Category 5 or 6 1000BASE-T	Category 5 or 6 UTP cable with RJ-45 connectors
CWDM-GBIC-1470=	1000BASE-CWDM GBIC 1470 nm	10-micron SMF cable (yellow) with SC connectors 1
CWDM-GBIC-1490=	1000BASE-CWDM GBIC 1490 nm	10-micron SMF cable (yellow) with SC connectors 1
CWDM-GBIC-1510=	1000BASE-CWDM GBIC 1510 nm	10-micron SMF cable (yellow) with SC connectors 1
CWDM-GBIC-1530=	1000BASE-CWDM GBIC 1530 nm	10-micron SMF cable (yellow) with SC connectors 1
CWDM-GBIC-1550=	1000BASE-CWDM GBIC 1550 nm	10-micron SMF cable (yellow) with SC connectors 1
CWDM-GBIC-1570=	1000BASE-CWDM GBIC 1570 nm	10-micron SMF cable (yellow) with SC connectors 1
CWDM-GBIC-1590=	1000BASE-CWDM GBIC 1590 nm	10-micron SMF cable (yellow) with SC connector 1s
CWDM-GBIC-1610=	1000BASE-CWDM GBIC 1610 nm	10-micron SMF cable (yellow) with SC connectors 1

¹10-dB SMF optical attenuators with SC connectors (two per duplex cable) are required for distances less than 25 km (15.5 miles). Install the attenuators between the male SC connector on the cable and the female SC connector on the network module.

Installing and Removing GBICs

Gigabit Ethernet network modules support GBIC hot-swapping. To save time, do not power down the router and network module before installing or removing the GBIC.

Warning Because invisible laser radiation may be emitted from the aperture of the port when no fiber cable is connected, avoid exposure to laser radiation and do not stare into open apertures. Statement 240

Note GBICs from other vendors are not supported by the Cisco Gigabit Ethernet network module.

Step 1

Hold down the clips on the side of the GBIC while inserting the GBIC into the GBIC slot in the network module faceplate. (See Figure 21-2.)

Laser Safety Guidelines

Optical GBICs use a small laser to generate the fiber-optic signal. Keep the transmit port covered whenever a cable is not connected to the port.

Warning Ultimate disposal of this product should be handled according to all national laws and regulations. Statement 1040

Connecting Gigabit Ethernet Network Modules to the Network

Use the cables listed in Table 21-1 to connect the GBIC connectors on the network module to a networking device. (See Figure 21-4.)

Figure 21-4 Connecting a Gigabit Ethernet Network Module to a Cisco 7200 Series Router

Gigabit Ethernet Network Module LEDs

All network modules have an enable (EN) LED. This LED indicates that the module has passed its self-tests and is available to the router. See Figure 21-5 and Table 21-2 for LEDs specific to the Gigabit Ethernet network module.

Table 21-2 Gigabit Ethernet Network Module LEDs
LED	Meaning
LINK	Green indicates that a link has been established between the network module and another networking device.
TX	Flashing green indicates transmit activity.
RX	Flashing green indicates receive activity.
EN	Green indicates that the network module has passed its self-test and is available to the router.

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