Tag Archives: Cisco SFP modules

Which One to Select, GLC-LH-SM Vs GLC-LH-SMD?

Among so many different Cisco SFP modules, sometimes you may feel confused. Because the differences of some SFP modules are tiny, for instance, Cisco SFP GLC-LH-SM and Cisco SFP GLC-LH-SMD. If you can’t understand the the difference between these two Cisco SFP modules, you don’t know which one to select for your Cisco switch. This article is gonna explain GLC-LH-SM vs GLC-LH-SMD.

Cisco SFP GLC-LH-SM

Cisco SFP GLC-LH-SM is a hot swappable transceiver module that transfers the data rate of 1 Gbps. It’s compliant with IEEE 802.3 1000BASE-LX/LH standard. It supports the link lengths up to 10 km over single mode fiber patch cable at a wavelength of 1310 nm. It can be also applied for short network connection over multimode fiber cable (550 m).
Other features:
Interface: LC duplex
Tx power: -9.5 ~ -3dBm
Receiver Sensitivity < -23dBm
Commercial Temperature Range: 0 to 70°C (32 to 158°F)
DOM Support: No

Cisco SFP GLC-LH-SM

Cisco SFP GLC-LH-SMD

Cisco SFP GLC-LH-SMD is a hot pluggable transceiver module running the data rate at 1 Gbps. This SFP is interfaced with 1000BASE-LX/LH ports. And it can support both single mode and multimode applications.
Other features:
Interface: LC duplex
Tx power: -9.5 ~ -3dBm
Receiver Sensitivity < -23dBm
Commercial Temperature Range: 0 to 70°C (32 to 158°F)
DOM Support: Yes

GLC-LH-SM vs. GLC-LH-SMD Similarities

Cisco SFP GLC-LH-SM and Cisco SFP GLC-LH-SMD are both used for 1Gbps Ethernet network. They support with IEEE 802.3 1000BASE-LX/LH standard and are compatible with each other. The two Cisco SFP modules can be connected with single mode and multimode LC fiber patch cable. If one switch supports Cisco SFP GLC-LH-SM, then it can also support Cisco SFP GLC-LH-SMD. Here are supported switches for these two Cisco SFP modules: Catalyst Express 500, Catalyst Express 520, Cisco ME 3400, Cisco ME 4900 series, Cisco ME 6500 series, Catalyst 2940 series, Catalyst 2950 series, Catalyst 2960 series, Catalyst 2960 S series, Catalyst 2970 series, Catalyst 3560 series, Catalyst 3560 E series, Catalyst 3560-X series, Catalyst 3750 series, Catalyst 3750-E series, Catalyst 3750-X series, Catalyst 4500series, Catalyst 4900 series, Catalyst 6500 series, cisco IE3010 series.

GLC-LH-SM vs. GLC-LH-SMD Differences

The difference between Cisco SFP GLC-LH-SM and Cisco SFP GLC-LH-SMD is that Cisco SFP GLC-LH-SMD has additional letter “D”. What does “D” mean?

There are two kinds of misunderstanding about “D”. Some think “D” represent “duplex”. Cisco SFP GLC-LH-SMD supports duplex interface. But Cisco SFP GLC-LH-SM should be connected with duplex LC patch cable. And nearly all SFP transceiver modules, except copper SFPs, are interfaced with duplex ports. So this understanding is obvious wrong. Some think that “D” means “ruggged”. This opinion is not true either. “Rugged” is abbreviated to “RGD”, for example, Cisco GLC-LX-SM-RGD Compatible 1000BASE-LX/LH SFP 1310nm 10km DOM Transceiver.

“D” of GLC-LH-SMD transceiver has additional support for Digital Optical Monitoring (DOM) capability. From the features stated above, Cisco SFP GLC-LH-SMD can support DOM function while Cisco SFP GLC-LH-SM can’t. DOM provides a diagnostic monitoring interface for optical transceiver modules. DOM supports monitoring of optic output power, optic input power, temperature, laser bias current, and transceiver voltage. When DOM is enabled, the system monitors the temperature and signal power levels for the optical transceiver modules in the specified ports. Console messages and syslog messages are sent when optical operating conditions fall below or rise above the SFP manufacturer-recommended thresholds.

Which to Select, GLC-LH-SM vs. GLC-LH-SMD?

Cisco SFP GLC-LH-SM and Cisco SFP GLC-LH-SMD are very similar and compatible with each other. The only difference is that the latter one has DOM function. SFP with DOM is better for transceiver and system protection. So you are suggested to select Cisco SFP GLC-LH-SMD. Except these two Cisco SFPS, you can find other Cisco compatible SFPs from FS.COM. For more information, please visit out site http://www.fs.com.

Outstanding Cisco GBIC and SFP Transceivers

GBIC transceiver is one of the many kinds of transceivers that is capable of receiving as well as sending data. The purpose of GBIC transceiver is to convert digital media between a separate fiber optic based network and Gigabit Ethernet network. From this one device, users are able to generate connections utilizing the multi or single mode fiber optic ports along with the copper wiring.

GBIC transceiver comes with multiple sources agreement, this enables the manufacturers to save their money to set up their own standards and also resolve any compatibility issues as well. With the help of a GBIC transceiver, Gigabit network devices can connect to the copper wires, single mode fiber ports, or any other multimode fiber ports directly. GBIC transceivers are appropriate for any interconnections over the Gigabit Ethernet hubs and for switches platform.

Various variants of GBIC transceivers are available and the latest SFP modules (or mini-GBIC) provide companies and service providers with the ability to set up a Fiber Channel and Gigabit Ethernet connection within their network with ease and simplicity. The Gigabit Interface Convertor is the standard for transceivers that gets plugged into Gigabit Ethernet and gets connected to a fiber optic network.

Usually the SFP modules are found with the LC fiber connecter interface. This model of transceiver covers a wide range including various types working at different wavelength and distance. This type of transceivers provide customers with a very convenient and affordable solution for finding a large area of habitat in metropolitan area access, data center, and ring networks, campus and storage area networks. Cisco which believes in their motto of meeting commitment and excellence offers a wide set of choices in regard of protocols, speeds, reaches and transmission media support. They provide customers with a larger range of interfaces which are detachable to multimode or single-mode type of optic fibers along with coaxial or UTP electrical cables. In addition to this transportation of LAN packets through TDM-based WAN and also streams over the packet-switching networks.

The main products from Cisco are switches, wireless systems; open networking systems, security systems, software, modules and interfaces, network management and automation system. Cisco is also specialized in producing transceivers which include a well advanced and useful type of SFP transceiver. Cisco has made enormous amount of investments spent to keep rhythm of standard of Cisco SFP. With high quality raw materials, skilled labor and advanced manufacturing equipment they facilitate highly efficient design for host devices, provide flexibility in network, and an immense amount of savings regarding the maintenance of the system.

The advantages of Cisco SFP and GBIC transceiver are its scalability that uses only one strand to move up to about eight channels. The equipment works with a standard SFP and GBIC port. In addition to that, the Cisco equipment does not require be powered and even configured. It is a versatile equipment that enables multiple network configurations. Simultaneously, these products help businesses and service providers to maximize the bandwidth of a Gigabit Ethernet without making use of a new fiber.

FiberStore Technology, offers not only original Cisco SFP modules and Cisco GBIC transceivers, but also compatiable SFP and GBIC modules. Have a wide selection there.