Basics of Cisco GLC-LH-SM SFP optical module
According to the physical standard, Cisco SFP optical module can be divided into 1000BASE-T, 1000BASE-SX, 1000BASE-LX / LH, 1000BASE-EX, 1000BASE-ZX, 1000BASE-BX10-D / U optical module. The Cisco GLC-LH-SM optical module is a 1000BASE-LX / LH optical module, which will be covered in detail in this article.

Cisco GLC-LH-SM SFP optical module overview

The Cisco GLC-LH-SM SFP optical module is a very popular hot-swappable module that utilizes a duplex LC interface that is the smallest Gigabit Ethernet optical module for high-density fiber optic applications. This optical module conforms to the SFP MSA protocol and can be used in both single-mode fiber applications and multimode fiber applications.

The Cisco GLC-LH-SM SFP optical module is composed of 1310nm FP laser emitters, PIN photodetectors, transimpedance amplifiers (TIA), microcontrollers (MCUs) and other components, in line with IEEE 802.3z 1000BASE-LX standard, the farthest supporting distance up to10 km transmission. In order to maintain the best performance of the Cisco GLC-LH-SM SFP optical module, the temperature of its operating environment is preferably controlled between 0 and 70 ° C. Although this optical module does not monitor the diagnostic function, but can be used in a variety of Cisco devices, the common Cisco ME 2400/4500 series, Cisco Catalyst 2900/3750 series.

Features of Cisco GLC-LH-SM SFP optical module

As a very popular Gigabit Ethernet optical module, Cisco GLC-LH-SM SFP optical module has the following characteristics:

1. Cisco GLC-LH-SM SFP optical modules can be run without configuration. In general, the optical module needs to be configured before running, and the use of the Cisco GLC-LH-SM SFP optical module can omit this step, which can help network engineers save installation time, this optical module internal calibration mechanism also help optimize the system's data throughput. 

2. Cisco GLC-LH-SM SFP optical module is a true hot-pluggable optical module, plug and play, if an optical module in the process of running the system fails, immediately replace the new optical module cannot cause the whole system shut down. 

3. The Cisco GLC-LH-SM SFP optical module can be used with both single-mode fiber and multimode fiber. When used with single-mode fiber, the transmission distance can reach 10 km, suitable for long-distance transmission applications such as campus network; and multi-mode fiber with the use of the maximum data transmission capacity can reach 1.25Gbps, the transmission distance is as far as 550 m.

GLC-LH-SM SFP optical module

The following are detailed parameters of the GLC-LH-SM SFP optical module:
Cisco models GLC-LH-SM Package SFP
Data transfer rate 1000Mbps wavelength 1310 nm
Laser 1310nm FP Laser launcher Fiber type Multimode / single mode
Transmission distance 10 km interface LC(Duplex)
Transmit power -9.5dB ~ -3dB Receiver sensitivity < -23dBm
Operating temperature 0-70°C Monitor the diagnostic (DOM) function not support

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