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Chapter 1 Product Overview
Switch Description
1-4
Catalyst 2984G, 2948G-GE-TX, and 2980G Switch Hardware Installation Guide
78-6286-05
Note Catalyst 2948G-GE-TX switch only supports 1000 Mbps and full-duplex modes
on SFP modules.
Except for the 1000BASE-T SFP module, all of the SFP modules are used to
establish fiber-optic connections. You use fiber-optic cables with Lucent (LC)
connectors to connect to an SFP module. The SFP modules support 850 to 1550
nanometer nominal wave lengths. These field-replaceable modules provide the
uplink optical interfaces, laser send (TX) and laser receive (RX). For a detailed
description of Gigabit Ethernet ports see the “Connecting To an SFP Module”
section on page 4-12.
Switch Features
Table 1-1 describes the Catalyst 2948G, 2948G-GE-TX, and 2980G switch
features.
Table 1-1 Catalyst 2948G, 2948G-GE-TX, and 2980G Switch Features
Feature Description
Ethernet speeds
• Ethernet (10BASE-T) interface to workstations and repeaters
• Fast Ethernet (100BASE-T) interface to workstations, servers,
switches, and routers
Note Autonegotiation of link speed on each 10/100 and 10/100/1000
port allows migration to 100BASE-T or 1000BASE-T from a
10BASE-T or 100BASE-T installed base.
• Gigabit Ethernet (1000BASE-T) copper and Gigabit Ethernet
(1000BASE-X) fiber-optic interface for backbone interconnection of
high-performance switches and routers
Standard management and
support
• Layer 2 forwarding with an aggregate forwarding rate of greater than
17.8 million packets per second
• 16,000 MAC addresses per system