1. fundamentals of GLC-LH-SMD optical modules
important module parameters of Cisco GLC-LH-SMD
The Cisco GLC-LH-SMD Optical Module is an MSA protocol compliant connectivity answer that connects a Gigabit Ethernet port or slot to an optical fiber community. it is also called 1000BASE-LX / LH SFP transceiver. the subsequent is the table of parameters of this optical module.
vital applications of Cisco GLC-LH-SMD
Cisco GLC-LH-SMD optical module is like minded with various optical transmission networks, and packages following protocols along with Fiber Channel, SDH/SONET/ATM, Gigabit Ethernet, and others. This transceiver is practical throughout style of switches, routers and server interfaces too.
2. comparison between Cisco GLC-LH-SM and GLC-LH-SMD
Similarities
Cisco GLC-LH-SM and GLC-LH-SMD are similar in many capabilities. both of these supply data transmission reach of 10km on the enter wavelength of 1310nm. they're fully well matched with IEEE 802.3 1000BASE-LX/LH preferred and for that reason they may be used interchangeably. At Cozlink, you could discover each of these priced at $7.
differences
The maximum apparent distinction between Cisco GLC-LH-SM and GLC-LH-SMD is whether or not it has a DDM support or no longer.
3. DDM function – specific factor of GLC-LH-SMD Transceiver
The letter “D” in GLC-LH-SMD stands for digital diagnostic monitoring function also referred to as virtual optical tracking (DOM). this option is added as per Multi-supply agreement (MSA) SFF-8472. It serves following purposes:
a. aspect monitoring
Optical Transceivers need monitoring of these parameters in order that these crucial connectivity solutions are not overworked and fall liable to fault. those parameters are – laser bias current, transceiver deliver voltage, transceiver temperature, common optical power, average optical strength transmitted and acquired, and optical modulation amplitude. If any of these parameters are passed, the DDM system warns the machine approximately failure of compliance.
b. Fault identity and Isolation
DDM enables clean fault isolation and their identity specifically place of optical network system. It problems repute flags and the usage of those flags in addition to parametric monitoring facts that DDM produces, you can still pick the defective element and confirm the purpose for failed hyperlink right away.
c. Failure prediction earlier
DDM is effective in identifying primary screw ups common with optical transceivers including common mistakes and breakdowns. based at the transceiver performance parameters record, DDM can are expecting approaching failures of the fiber optic links. Transmitter performance is liable for breakdowns and common errors are attributed to the operating situations of the transceiver. The expertise about these conditions could make the failure prevention less difficult.
