GLC-LH-SMD Cisco Compatible (1000Base-LX) Optical Transceiver

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Cisco GLC-LH-SMD (1000Base-LX) Optical Transceiver

Example Application

All FluxLight 1000Base-LXs

Full downloadable spec sheet: GLC-LX-SMD

FluxLight's GLC-LH-SMD is a Cisco® compatible 1000Base-LX SFP Optical Transceiver and is factory preprogrammed with all the necessary configuration data for seamless network integration. Our transceivers perform identically to Cisco® original transceivers and are 100% compatible with other OEM and third party transceivers. The Cisco GLC-LH-SMD is 100% MSA (Multi-Source Agreement) compliant. All FluxLight's transceivers are tested for 100% functionality and guaranteed compatible for outstanding network performance.

FluxLight offers all brands and form factors of Optical Transceivers for all your networking needs. Now you have a reliable, compatible and affordable means to expand your network while maintaining its integrity.

Product Quality

Since its inception in 2004, Fluxlight has continually refined its processes to assure the best possible quality for our customers. The foundational elements of these processes are Record-Keeping and Quality Assurance Testing (QAT). To maintain a robust data archive, each part is individually serialized both in its internal EEPROM memory and on its external label. All QAT results and other important information (e.g., manufacture date, compatibility programming) are associated with each Serial Number stored in our cloud-based secure database. QAT consists of visual part inspection as well as verification of all critical parameters and performance of each part. For the GLC-LH-SMD optical output power and wavelength (1310nm) are verified on optical spectrum analyzers. Receiver sensitivity is verified at both minimum distance and the 10km maximum range over actual (not simulated) SMF , singlemode fiber cable. Digital Diagnostics Monitoring (DDM) parameters including: optical output power, receive optical power, internal module temperature, transmit bias current and supply voltage, are tested for compliance with specifications.In addition, the part is verified for proper operation across its full operating temperature range, 0C to 50C.


FluxLight GLC-LH-SMD Application: 1Gbps Campus Interconnect with DDM


The GLC-LH-SMD optical transceiver is ideal for trunking light-to-medium access/aggregation switch traffic on campus networks. This transceiver supports full-duplex 1Gbps transmission over up to 10 kilometers (~6.2 miles) of standard single-mode fiber. While many new access switches support 10Gbps uplinks, lower priced options, like the Cisco Catalyst 9200 product featured in this example, are available at 1Gbps. In this application, traffic aggregated at several Catalyst 9200 switches is redundantly trunked to Cisco Nexus 9396PX core switches.

CORE SWITCH: Cisco Nexus 9396PX

Cisco Nexus 9396PX

The Nexus® 9396PX platform is part of the latest generation of the fixed Nexus® 9000 Series Switches. Cisco uses the phrase “Application Centric Infrastructure (ACI)” to describe the technology on which this series is based. The primary elements of ACI are,

  • Automated IT workflows to shorten application deployment
  • Software Defined Networking (SDN)
  • Advanced security and analytics
  • Seamless application migration across multiple locations

The Cisco Nexus 9396PX Switch is a 2RU switch that supports 1.92 Tbps of throughput. The switch includes 48 SFP+ slots which may be equipped with either SFP or SFP+ modules so both 1G and 10G speeds are possible on a per port basis. 12 fixed QSFP uplink slots are included in the N9372PX. These may be equipped with up to 12 QSFP+ 40GE modules or up to 4 QSFP28 100G modules.

The N9396PX may be equipped with a wide range of optical transceiver interface types across the many rates mentioned above. The tables below include the compatible transceiver types for the two categories of ports in the switch.

Table 1 SFP Optical Transceivers

GLC-SX-MMD SFP SX, 550m/OM2, MMF, duplex LC
GLC-LH-SMD SFP LX, 10km, SMF, duplex LC
GLC-EX-SMD SFP EX, 40km, SMF, duplex LC
GLC-ZX-SMD SFP ZX, 70km, SMF, duplex LC
GLC-TE SFP T, 100m, CAT5e, RJ45
GLC-BX-U, GLC-BX-D SFP BX, 10km/40km/80km, SMF, simplex LC


Table 2 SFP+/SFP28 Optical Transceivers

SFP-10G-SR SFP+ SR, 300m/OM3, 400m/OM4, duplex LC
SFP-10G-LR SFP+ LR, 10km, SMF, duplex LC
SFP-10G-LRM SFP+ LRM, 220 OM1 MMF, duplex LC
SFP-10G-ER  SFP+ ER, 40km, SMF, duplex LC
SFP-10G-ZR SFP+ ZR, 80km, SMF, duplex LC
SFP-10G-T SFP+ T, 30m, CAT7, RJ45
SFP-10GBX-UD-PAIR SFP+ BX, 10km, SMF, simplex LC



SFP+ BX, 40km, SMF, simplex LC


Table 3 QSFP+ 40G Optical Transceivers

QSFP-40G-SR4 QSFP+ 40G SR4, 100m, OM3 MMF, MPO connector
QSFP-40G-CSR4 QSFP+ 40G CSR4, 300m OM3 MMF, MPO connector
WSP-Q40GLR4L QSFP+ 40G LR4L, 2Km SMF, duplex LC
QSFP-40G-ER4 QSFP+ 40G ER4, 40Km SMF, duplex LC
QSFP-40G-SR-BD QSFP+ 40G Bidirectional MMF, 100m OM3, duplex LC
QSFP-40G-LR4 QSFP+ 40G LR4, 10km SMF, duplex LC


ACCESS SWITCH:  Cisco Catalyst C9200L-24P-4G

Cisco Catalyst C9200L-24P-4GCisco Catalyst 9200 (C9200-24P-4G is the top unit)

Cisco’s Catalyst 9200 series is available in both fixed and modular configurations. The specific model in this example is the C9200-24P-4G. The switch includes 24 POE RJ45 ports and 4 SFP 1GbE slots. The unit may be stacked with other fixed configuration 9200 series models with up to 80 Gbps of stacking bandwidth. The switching capacity is 104 Gbps with a forwarding rate of 154.76 million packets per second (Mpps). Highlights of the Cisco IOS XE software are,

  • Automated device provisioning
  • API-driven configuration
  • Granular visibility (new-real-time network monitoring)
  • Seamless software upgrades and patching

The table below shows the range of optical transceivers that may be equipped in the C9200L-24P-4G’s 4 SFP slots.

Table 4 SFP Optical Transceivers

GLC-SX-MMD SFP SX, 550m/OM2, MMF, duplex LC
GLC-LH-SMD SFP LX, 10km, SMF, duplex LC
GLC-EX-SMD SFP EX, 40km, SMF, duplex LC
GLC-ZX-SMD SFP ZX, 70km, SMF, duplex LC
GLC-TE SFP T, 100m, CAT5e, RJ45
GLC-BX-U, GLC-BX-D SFP BX, 10km/40km/80km, SMF, simplex LC



FluxLight GLC-LH-MD

FluxLight’s GLC-LH-SMD (click link for datasheet) is a Cisco® compatible 1000Base-LX SFP DDM Optical Transceiver and is factory pre-programmed with all the necessary configuration data for fully compatible operation with all Cisco equipment offering SFP slots. The FluxLight GLC-LH-SMD includes a dual-LC connector and supports full duplex 1GbE over up to 10km single-mode fiber links.

FluxLight’s device performs identically to Cisco® original transceivers, are 100% compatible and support full hot swappable operation. The GLC-LH-SMD is 100% MSA (Multi-Source Agreement) compliant, see: SFP MSA.

The major difference between the GLC-LH-SMD and the GLC-LH-SM is the addition of Digital Diagnostics Monitoring, DDM (also known as Digital Optical Monitoring or DOM) as defined in SFF-8472. DDM allows users to locally or remotely monitor the status of critical operating information in the optical transceiver. Monitored status includes current operation temperature, optical transmit power (dBm), optical receive power (dBm), internal supply voltage (Vdc) and transmit bias current. Along with real-time values for each of these parameters, upper and lower thresholds for both Alarm and Warning levels for each are stored in the module’s internal EEPROM.



The GLC-LH-SMD modules equipped in the Cisco Nexus 9396PX and Catalyst C9200 switches offer a duplex LC type connector and utilize single mode fiber (SMF) for transmission. Since this application involves transmission over outside plant fiber across a campus, the optical transceiver modules are typically connected to a nearby optical patch panel using a short single mode jumper cable. An example jumper, shown in the figure above, has dual-LC connectors at each end and is 2 meters long.  If the fiber patch panel is further away or has a connector type other that dual-LC, of course an alternative cables are available, see: FluxLight OS2 fiber jumpers.

Putting it all together

The local network connectivity is achieved by inserting a FluxLight GLC-LH-SMD into each switch and then using an appropriate length Duplex-LC SMF jumper cable to attach to a port on the patch panel, as shown below.

GLC-LH-SMD Application-03

To create a robust network, each C9200 access switch is dual-homed to two Nexus 9396PX switches. Two FluxLight GLC-LH-SMD modules are equipped in the C9200 switches as shown in the diagram below. Since there are three C9200 switches in the example, a total of three GLC-LH-SM modules must be equipped in each of the N9372 switches.

GLC-LH-SMD Application-02

Cisco switches were used to demonstrate the application. FluxLight carries 1000BASE-LX modules compatible with a wide range of OEM switches. Some popular models are listed below.

Table 5 SFP Optical Transceivers for Popular Switch OEMs

E1MG-LX-OM Brocade-Foundry
MA-SFP-1GB-LX10 Meraki
320-2879 Dell

FluxLight's Full Line of 1000Bse-LX Optical Transceivers with DDM

AdTran 1200481E1 Avaya/Nortel AA1419049-E6 Finisar FTLF1318P3BTL
AdTran 1184561P1 Brocade-Foundry E1MG-LX-OM HP JD119A
AdTran 1184561PG1 Calix 100-01662-C HP JD119B
AdTran 1442320G1 Checkpoint CPAC-TR-1LX IBM 45W2816
AdTran 1442610G1 Checkpoint CPAC-TR-1LX-SSM160-SFP IBM 45W2817
Alcatel-Lucent iSFP-GIG-LX Checkpoint CPAP-ACC-TR-1LX IBM 88Y6839
Allied Telesis AT-SPLX10/I Cisco GLC-LH-SMD Meraki MA-SFP-1GB-LX10
Arista AR-SFP-1G-LX Cisco GLC-LH-SMD-Ind Meraki SFP-1GB-LX10
Avago AFCT-5705ALZ Cisco ONS-SI-GE-LX Rad SFP-6D
Avago AFCT-5705APZ Cisco SFP-GE-L Riverstone SFPGE-19
Avago AFCT-5705LZ Dell 320-2879 TRENDnet TEG-MGBLX
Avago AFCT-5705PZ Dell 331-5309 ZyXEL SFP-LX-10-D
Avaya/Nortel AA1419049 Dell 407-10436  

Original Equipment Manufacturer (OEM) names may be registered trademarks of the respective OEM, and the OEM has neither authorized nor sponsored the use of its trademark or trade name. All OEM names are used for cross reference/comparative purposes only.

Warranty Information

Limited Lifetime Warranty

Fluxlight provides a non-transferable serviceable lifetime warranty to the purchaser of Fluxlight hardware product purchased from Fluxlight or an authorized Fluxlight reseller. Fluxlight warrants to the original end customer of its products specified below that its products are free from defects in material and workmanship affecting form, fit, and function. All such products sold will work in the application specified at the time of purchase and will meet the datasheet specifications as found on Fluxlight’s Web site or otherwise provided by Fluxlight. Any claim alleging that any product fails to conform to the foregoing may be made only by the customer who purchased such product and only while such customer owns such product and while the product remains within the serviceable lifetime period. Fluxlight, at its option, will repair, replace, or provide a credit or refund of either the original purchase price or fair market value, whichever is lower, of any product that is determined by Fluxlight to be defective. Some systems that use Fluxlight products may be allowed to operate outside of the system manufacturer’s published settings and Fluxlight does not cover failure in these circumstances. This warranty covers only defects arising under normal use and do not include malfunctions or failures resulting from misuse, abuse, neglect, alteration, problems with electrical power, usage not in accordance with product instructions, acts of nature, or improper installation or improper operation or repairs made by anyone other than Fluxlight or an Fluxlight authorized third-party service provider. Fluxlight reserves the right to substitute functionally equivalent new or serviceable used parts.

Form more information please see our warranty page.