Cisco GLC-SX-MMD SFP Module is 1000BASE-SX SFP transceiver module, MMF, 850nm, DOM -option This part is also known as CSC-GLCSXMMD.

Cisco GLC-SX-MMD SFP Module Product Overview

this SFP s designed for use with Cisco networking equipment and is functionally equivalent to Cisco part number GLC-SX-MMD=. This transceiver is manufactured to meet or exceed the specifications of the original Cisco unit and to comply with the Multi-Source Agreement (MSA) standards. Tripp Lite guarantees 100% compatibility with Cisco networking hardware and will initialize and perform identically to an OEM transceiver.

The information about the optical modules contained in the labels of the Cisco optical modules can help us distinguish optical modules. For example, SX and SR in optical module models represent short distances. Transmission, ZX, EXZ stands for long-distance transmission, etc. However, due to the variety and type of Cisco optical modules, we still easily confuse different types of optical modules. In this article, we will focus on the differences between Cisco GLC-LH-SMD, GLC-SX-MMD, and GLC-ZX-SM optical modules. Divided into several types of optical modules.

Cisco GLC-SX-MMD SFP Module Product Picture

Cisco GLC-SX-MMD SFP ModuleCisco GLC-SX-MMD SFP Module

Cisco GLC-SX-MMD SFP Module Specifications

Optical module model GLC-LH-SMD GLC-SX-MMD GLC-ZX-SM
Optical module name Cisco GLC-LH-SMD SFP Gigabit optical module Cisco GLC-SX-MMD SFP Gigabit optical module Cisco GLC-ZX-SM SFP Gigabit optical module
Package Type SFP SFP SFP
Rate 1000Mbps 1000Mbps 1000Mbps
Center wavelength 1310nm 850nm 1550nm
Interface Duplex LC Duplex LC Duplex LC
Transmission distance 10km 550m 70km
Transmit optical power -9~-3dBm -9.5~-3dBm 0~5dBm
Receiving sensitivity <-21dBm <-17dBm <-24dBm
DOM Function Support Support Support
Laser type FP 1310nm VCSEL 850nm DFB 1550nm
Commercial temperature 0~70°C 0~70°C 0~70°C
Application of optical modules Gigabit Ethernet Gigabit Ethernet Gigabit Ethernet
1000BASE-LX Fiber Channel Fiber Channel
Compatible switches Cisco ME 3600 Cisco Catalyst 3560 Cisco Catalyst 2960
Cisco ME 3800 Cisco Catalyst 3750 Cisco Catalyst 3560
Cisco ME 3900 Cisco Catalyst Express 500 Cisco Catalyst Compact 2960

See the package type, speed, interface, and commercial temperature of the three optical modules are the same, but the other aspects are different. For example, we can see from the model. In addition to the “D” in the model of the GLC-ZX-SM optical module, the other two optical modules are available, and the “D” at the end of the model represents DOM work.From GLC-LH-SMD, GLC-SX-MMD, and GLC-ZX-SM optical modules. We can

Yes, this means that the GLC-ZX-SM optical module does not support DOM functionality, while the other two optical modules support it.


These three optical modules are not absolutely good or bad, you need to choose the right optical module according to your network application. From a functional point of view. See, Cisco GLC-LH-SMD, GLC-SX-MMD optical modules have more DOM functions than GLC-ZX-SM optical modules, if you need to have DOM function For optical modules, it is not recommended to choose the GLC-ZX-SM optical module. If you need a long-distance optical module, it is recommended that you choose a GLC-ZX-SM optical module with a transmission distance of 70km; if it is a short-distance transmission, you can

Select the GLC-SX-MMD optical module with a transmission distance of 550m; if you need 10km data transmission, it is recommended that you select the GLC-LH-SMD optical module.

Cisco GLC-SX-MMD SFP Module Features

1,Cisco switch compatible…Comparable to GLC-SX-MMD=

2,Compliant with SFP Multi-Source Agreement (MSA) standards

3,1000Base-SX transceiver supports data transfer rates up to 1.25Gbps

4,300 meter transmission distance using 62.5/125 Multimode cabling

5,500 meter transmission distance using 50/125 Multimode cabling

6,850nm wavelength VCSEL Laser

7,Duplex LC Connector

8,Electrical interface compliant with SFF-8431

9,Supports Digital Diagnostic Monitoring (DDM)


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