3Com 1000BASE-SX quick start and 2 with the rear ports

22-PORT 1000BASE-SXAND 2-PORT 1000BASE-LX GIGABIT ETHERNET INTERFACE MODULES QUICK START GUIDE

As shown in Figure 1, GEN Interface Modules are available in two models:

■1000BASE-LX (order number 3CB9LG2SC). Ports on this module use a 1300-nanometer, multimode/single-mode, optical transceivers (colored blue) and SC connectors.

■1000BASE-SX (order number 3CB9LG2MC). Ports on this module use an 850-nanometer, multimode, optical transceivers (colored black) and SC connectors.

Figure 1 Front Panels of the GEN Interface Modules

Ejector handle			Ejector handle
Module Status LED
	Port Status LEDs
		Fiber-optic ports
		(SC connectors)	Model number
			1000BASE-LX

MOD	STAT
	1	2

TX

1

RX TX

RX

2

3CB9LG2SC

MOD STAT

1000BASE-SX

TX RX TX RX

1	2
	1	2

3CB9LG2MC

Each GEN Interface Module has two ports on the front (see Figure 1) as well as two ports on the rear of the module (not shown in Figure 1) that connect to the chassis backplane. Because the front ports have a pass-through function to the rear ports, they share port numbers

1 and 2 with the rear ports.

In the 16-slot chassis, you install modules vertically with the LEDs at the top. In the 7-slot chassis, you install modules horizontally, as shown in Figure 1.