Cisco 10GBASE X2 module offers a wide variety of 10 Gigabit Ethernet connectivity options for data center, enterprise wiring closet, and service provider transport applications. Today’s text will be focused on two commonly used Cisco 10GBASE X2 transceivers—Cisco X2-10GB-LR and X2-10GB-LRM.

Cisco X2 transceiver is the most famous X2 transceiver brand in the telecommunication field. Cisco X2 transceiver supports Ethernet, Sonnet/SDH and Fibre Channel applications across all Cisco switching and routing platforms.

Customers may feel confused about Cisco X2-10GB-LR and X2-10GB-LRM since they look like similar except for the extra letter "M”. A brief description of their similarities will be provided in the following table.

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SFP (small form pluggable) transceiver, also called Mini-GBIC by the vendors, is one of the key components required for telecom and data communication applications. There are many companies supplying SFP transceiver like Cisco, Finisar, 3com, HP, NETGEAR, etc. You can find all compatible SFP transceivers in Fiberstore with competitive price and great performance. 1000BASE-LX/LH SFP, one of the commonly used optical transceivers, is now very popular in the optical network system. The following text is going to illustrate something you may feel curious about 1000BASE-LX/LH SFP (GLC-LX-SM-RGD and Finisar FTLF1318P2BTL). From the article, we might have a deeper understanding of using these transceiver modules.

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Cisco’s leading position in data communication is undisputed. Cisco’s products, like switches, routers and Small Form-factor Pluggables(SFP) transceivers occupy most of the market share, of which Cisco SFP transceiver module plays a vital role in it. These small modular optical interface transceivers offer a convenient and cost effective solution for the adoption of Gigabit Ethernet and Fibre Channel in data center, campus, metropolitan area access and ring networks, and storage area networks. Cisco SFP GLC-SX-MM and GLC-SX-MMD are the two common types of Cisco 1000BASE-SX SFPs. Today we are going to talk about the difference between Cisco GLC-SX-MM SFP and GLC-SX-MMD.

First let’s get familiar with GLC-SX-MM. GLC-SX-MM is Cisco 1000BASE-SX SFP transceiver module for multimode fiber. Cisco GLC-SX-MM is the SFP fiber optic transceiver module which operates on the 1000BASE-SX standard. It is the multimode module with a wavelength of 850nm. Cisco 1000BASE-SX SFP transceiver module supports hot-pluggable SFP footprint duplex LC connector Interface. This transceiver is built to comply with Multi-Source Agreement (MSA) standards. GLC-SX-MM supports dual data-rate of 1.25Gbps/1.0625Gbps, which is widely used in fiber channel links, Gigabit Ethernet links, Fast Ethernet links, other optical links. The following picture shows Compatible Cisco GLC-SX-MM SFP.

Besides Cisco GLC-SX-MM, Cisco GLC-SX-MMD is also one of the common types of Cisco’s SFP transceiver modules, which is compatible with the IEEE 802.3z 1000BASE-SX standard. Due to the similar mode, customers are usually getting confused with Cisco SFP GLC-SX-MMD and Cisco SFP GLC-SX-MM when choosing them. So, what’s the difference between them?

As it implies in the word, obviously the letter "D” is the only difference between GLC-SX-MMD and GLC-SX-MM. "D” refers to DOM functionality. DOM stands for Digital Optical Monitoring, which is an widely used standard, intended to give the network administrator the ability to monitor real-time parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current, and transceiver supply voltage.

That means you can configure your device to monitor optical transceivers in the system, either globally or by specified ports. When this feature is enabled, the system will monitor the temperature and signal power levels for the optical transceivers in the specified ports. Console messages and syslog messages are sent when optical operating conditions fall below or rise above the XFP or SFP manufacturer’s recommended thresholds. It is a useful function and now is very popular with users.

It is a great pity that GLC-SX-MM SFP has been no longer for sale since 2013 in Cisco. It is entirely replaced by GLC-SX-MMD. However, many users still choose to use GLC-SX-MM for the consideration of the costs and usage. Cisco GLC-SX-MMD is much more expensive than GLC-SX-MM. They nearly possess the same function in the switch except the additional DOM functionality. 

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