Cisco 2940 User Manual download pdf (Page 23)

1-5

Catalyst 2940 Switch Hardware Installation Guide

OL-6157-01

Chapter 1 Overview

Front-Panel Description

SFP Modules

The Catalyst 2940-8TF-S switch uses a field-replaceable SFP module to establish Gigabit connections.

You insert an SFP module into the SFP module slot on the front of the switch.

The Cisco SFP modules that are supported by the Catalyst 2940-8TF-S switch include:

• 1000BASE-LX, fiber-optic

• 1000BASE-SX, fiber-optic

• 1000BASE-T, copper

• Coarse Wavelength-Division Multiplexing (CDWM), fiber-optic

Note The Catalyst 2940-8TF-S switch only supports 1000 Mbps and full-duplex modes on SFP modules.

The 1000BASE-LX and 1000BASE-SX SFP modules are used to establish fiber-optic connections. You

use fiber-optic cables with LC connectors to connect to an SFP module. The SFP modules support 850

to 1550 nm nominal wavelengths. These field-replaceable modules provide the uplink optical interfaces,

laser send (TX), and laser receive (RX).

The restrictions are that each port must match the wave-length specifications on the other end of the

cable, and the cable must not exceed the stipulated cable length for reliable communications. Table 1-3

lists these stipulations.

The 1000BASE-T SFP module is used to establish a Gigabit Ethernet connection through a Category 5

(copper) cable. This module can provide a Gigabit Ethernet connection of up to 100 meters through a

Category 5 cable.

Use only Cisco SFP modules on the Catalyst 2940-8TF-S switch. Each SFP module has an internal serial

EEPROM that is encoded with security information. This encoding provides a way for Cisco to identify

and validate that the SFP module meets the requirements for the switch.

Table 1-3 Cabling Stipulations for Fiber-Optic SFP Modules

SFP

Module

62.5/125 micron

Multimode

850 nm

Fiber

1. nm = nanometer

50/125 micron

Multimode

850 nm Fiber

62.5/125 micron

Multimode

1310 nm Fiber

50/125 micron

Multimode

1310 nm Fiber

9/125 micron

Single-mode

1310 nm Fiber

8micron

Single-mode

Dispersion

Shifted Fiber

SX 275 m

200 Mhz-km

2. m = meter

550 m at

500 Mhz-km

—

LX — — 550 m at

500 Mhz-km

550 m at

400 Mhz-km

10 km —

CWDM

3. CWDM = Coarse Wavelength-Division Multiplexing

1470, 1490, 1510,

1530, 1550, 1570,

1590, 1610

SMF 9/125 — 62 miles (100

km)

1470, 1490,

1510, 1530,

1550, 1570,

1590, 1610

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