3Com DUA1771-2AAA01 manual Introduction

SuperStack® 3 Switch 4900 Series 1000BASE-LX Module (3C17712) User Guide

DUA1771-2AAA01

INTRODUCTION

The 1000BASE-LX Module (3C17712) provides your SuperStack® 3 Switch 4900 series with four Gigabit Ethernet fiber optic ports, each operating at full wire speed and set to full duplex. This allows you to provide connectivity between the Switch and remote workgroups or to create a high capacity aggregated link backbone connection.

The module requires management software version 1.2 or later to be installed on the Switch. For instructions on upgrading management software, refer to the documentation supplied with your Switch.

The Module conforms to the full duplex implementation of the Gigabit Ethernet standard, IEEE 802.3z. Each port provides a 1000 Mbps connections to another 1000BASE-LX device. Each port uses 62.5 ∝ m or 50 ∝ m multimode or 8-10 ∝ m single mode fiber optic cable with MT-RJ duplex connectors and supports the segment lengths specified in IEEE 802.3z, as shown below:

Fiber Size	Fiber Bandwidth	Segment Lengths Supported
	at 1300 nm
62.5 ∝ m	500 MHz*km	2–550 m (7–1805 ft)
50 ∝ m	400 MHz*km	2–550 m (7–1805 ft)
	500 MHz*km	2–550 m (7–1805 ft)
8-10 ∝ m	N/A	IEEE minimum:
		2 m–5 km (7-16405 ft)

3Com qualification:

2 m–10 km (7-32810 ft)

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