Cisco GLC-SX-MM Compatible 1000Base-SX SFP 850nm 500m Duplex LC MMF Optical Transceiver Module

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Cisco GLC-SX-MM-FL (1000Base-SX) Optical Transceiver

 Example Application

 Platform Support

 All FluxLight 1000Base-SXs

 Full downloadable spec sheet: GLC-SX-MM-FL

FluxLight's GLC-SX-MM-FL is a Cisco® compatible 1000Base SX SFP Optical Transceiver and is factory pre-programmed with all the necessary configuration data for seamless network integration. This MM SFP fiber transceiver performs identically to Cisco® original transceivers and is 100% compatible with other OEM and third party transceivers. The Cisco GLC-SX-MM-FL is 100% MSA (Multi-Source Agreement) compliant. All FluxLight's Cisco-compatible fiber module 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 MM SFP fiber transceiver to expand your network while maintaining its integrity.


Example Application

FluxLight GLC-SX-MM-FL Application: 1Gbps Switch Interconnect

FluxLight GLC-SX-MM-FL Application: 1Gbps Switch Interconnect

While most new fiber interconnects have moved to 10Gbps and higher rates, good old 1Gbps connections are all that is required in many instances. In many cases, a large number of low utilization 10/100/1000 Ethernet ports can be aggregated into a few 1Gbps links using low-cost 1GbE transceivers.

This application note describes the use of 1000BASE-SX links between small edge/access switches and a larger core/spine switch.

CORE SWITCH: Cisco Nexus 9372PX

Cisco Nexus 9372PX

The Nexus® 9372PX 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 app deployment
  • Software Defined Networking (SDN)
  • Advanced security and analytics
  • Seamless application migration across multiple locations

The Cisco Nexus 9372PX Switch is a 1RU switch that supports 1.44 Tbps of bandwidth and over 1.15 mpps (million packets per second). 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. Six fixed QSFP+ uplink slots are included in the N9372PX.

The N9272PX 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-MM-FLGLC-SX-MMD-FL              SFP SX, 550m/OM2, MMF, duplex LC
GLC-LH-SM, 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 9200

Cisco Catalyst 9200

Cisco’s Catalyst 9200 series is available in both fixed and modular configurations. The SKUs of the eight fixed models start with C9200L- and the four modular uplink models with C9200-. All models include either 24 or 48 RJ45 10/100/1000 copper downlink ports. If the SKU has a “P” after the 24 or 48 port number, the ports support Power Over Ethernet (POE). All eight fixed models offer 4 pluggable optical uplinks, either SFP or SFP+. If the final letter in the SKU is a “G” it means the switch has 1Gbps uplinks and if it ends in “X” it means 10Gpbs. In this example the C9200L-24G is selected as we only require 1GbE uplinks. The table below lists compatible transceivers that may be used with this switch.

Table 4 SFP Optical Transceivers

GLC-LH-SM, 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




FulxLight’s GLC-SX-MM-FL (click link for datasheet) is a Cisco® compatible 1000Base-SX SFP+ 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-SX-MM-FL includes a dual-LC connector and supports the follow link lengths over compatible multimode fiber jumpers,

  • FDDI-grade, 160 MHz*Km, 62.5 micron: 220m
  • OM1, 200 MHz*Km, 62.4 micron: 275M
  • OM2, 500 MHz*Km, 50 micron: 550m
  • OM3, 2000 MHz*Km, 50 micron: 1000m

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



To connect the GLC-SX-MM-FL modules in the Cisco Nexus 9372PX to the same type of modules equipped in the C9200 switches, a duplex multimode fiber jumper with dual-LC connectors at each end is used.  The one shown here is an OM1 fiber type that will support link up to 220 meters. If longer reaches are required, FluxLight has OM3 versions, see: FluxLight OM3 LC-LC jumpers.

Putting it all together

To create a robust network, each C9200 access switch is dual-homed to two Nexus 9372PX switches. Two FluxLight GLC-SX-MM-FL 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-SX-MM-FL modules must be equipped in each of the N9372 switches.FluxLight GLC-SX-MM Application: 1Gbps Switch Interconnect

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

Table 1 SFP Optical Transceivers for Popular Switch OEMs

EX-SFP-1GE-SX Juniper
J4858C HPE
MA-SFP-1GB-SX Meraki
10051 Extreme Networks


 Platform Support

7600 Series Router Firewalls
Cisco 800BB Cisco ASAHIGH
Aggregation Services Routers Cisco FPRHIGH
Cisco ASR1000 Cisco FPRMID
Cisco ASR900 Cisco FPRUHI
Cisco ASR9000 Integrated Services Routers
Cisco ASR901 Cisco IE1000
Cisco ASR903 Cisco IE2000
Cisco ASR920 Cisco IE3000
ASA Content Security Cisco IE4000
Cisco ASAMID Integrated Services Routers
Blade Switches Cisco 3800
OS Cisco ISR2900
Carrier Routing System Cisco ISR3900
CRS Cisco ISR4000
Catalyst Switches ME Ethernet Switches
Cisco CE500 Cisco C4KTOR
Cisco CE520 Cisco C6500
Cisco C2350 Cisco ME3400
Cisco C2360 Cisco ME3600X
Cisco C2900 Cisco ME3750
Cisco C2940 Cisco ME3800X
Cisco C2950 Mobile Wireless Routers
Cisco C2960 Cisco RANTRAN
Cisco C2960C Network Convergence System
Cisco C2960CX Cisco IE5000
Cisco C2960L Cisco NCS4200
Cisco C2960P Cisco NCS5000
Cisco C2960S Cisco NCS540
Cisco C2960X Cisco NCS5500
Cisco C2960XR Cisco NCS6000
Cisco C2970 Nexus
Cisco C2975 Cisco N2000
Cisco C3560 Cisco N3000
Cisco C3560C Cisco N3500
Cisco C3560CX Cisco N4000
Cisco C3560X Cisco N5000
Cisco C3650 Cisco N6000
Cisco C3750 Cisco N7000
Cisco C3750X Cisco N9200
Cisco C3850 Cisco N9300
Cisco C4500 Cisco N9500
Cisco C4500X Routers
Cisco C4900 Cisco 7200
Cisco C4900M Cisco 7300
Cisco C6000 Cisco 7304
Cisco C6800 Cisco 7600
Cisco 9200 Cisco GSR
Cisco 9200L Cisco WANLAN
Cisco C9300 Unified Computing System
Cisco C9400 Cisco UCSB
Cisco C9500 Cisco UCSC
Cloud System Management Universal Broadband Routers
Cisco EMBUNAM Cisco UBR10K
Connected Grid Routers Cisco UBR7200
Cisco CGR2000 Wireless Controller
Cisco CGS2500 Cisco AIRCTI2
Content Services Switches Cisco AIRCTU
Cisco CSS  

FluxLight's Full Line 1000Base-SX Fiber Optical Transceivers

3Com 3CSFP91-FL
Alcatel-Lucent MiniGBIC-SX-FL
Alcatel-Lucent MiniGBIC-SX-FLT
Alcatel-Lucent SFP-GIG-SX-FL
Alcatel-Lucent SFP-GIG-SX-FLT
Allied Telesis AT-SPEX-FL
Allied Telesis AT-SPSX-FL
Arista SFP-1G-SX-A-FL
Arista SFP-1G-SX-A-FLT
Aruba J4858D-FL
Avago AFBR-5710-FL
Brocade-Foundry E1MG-SX-FL
Brocade-Foundry E1MG-SX-OM-FL
Ciena XCVR-A00G85-FL
Dell 407-BBOR-FL
D-Link DEM-311GT-FL
D-Link DEM-312GT2-FL
Enterasys I-MGBIC-GSX-FL
Enterasys MGBIC-LC01-FL
Enterasys MGBIC-LC03-FL
Extreme 10051-FL
F5  OPT-0010-00-FL
Finisar FTRJ8519P2BNL-FL
Force10 GP-SFP2-1S-FL
Fortinet FN-TRAN-SX-FL
Gigamon SFP-502-FL
HP J4858A-E-FL
HP J4858A-FL
HP J4858B-E-FL
HP J4858B-FL
HP J4858C-E-FL
HP J4858C-FL
IBM 81Y1622-FL
Juniper EX-SFP-1GE-SX-FL
Juniper SFP-1GE-SX-FL
Juniper SFP-1GE-SX-FLT
Juniper SFP-1GE-SX-IT-FL
LG-Ericsson RDH10244/1-FL
Linksys MGBSX1-FL
Netgear AGM731F-FL
Nokia 3HE00027AA-FL
Nokia 3HE00027AA-FLT
RuggedCom SFP1122-1SX-FL
Sonicwall 01-SSC-9789-FL

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-SX-MM-FL optical output power and wavelength (850nm) are verified on optical spectrum analyzers. Receiver sensitivity is verified at both minimum distance and the 500m maximum range over actual (not simulated) MMF , multimode fiber cable. In addition, the part is verified for proper operation across its full operating temperature range, 0C to 50C.


The following is a list of Finisar Corporation patents Fluxlight has licensed. This licensure recognizes and compensates Finisar for their intellectual property. The GLC-SX-MM-FL, like all Fluxlight optical transceivers, is covered by this license agreement. Therefore, Fluxlight customers can rest assured that all products purchased are fully licensed, and our customers are under no potential liability that may ensue from the use of unlicensed optical transceiver products.

U.S. Patent Numbers: 7,184,668 (System and method of protecting eye safety during operation of a fiber optic transceiver), 7,079,775 (Integrated memory mapped controller circuit for fiber optics transceiver), 6,957,021 (Optical transceiver with memory mapped locations), 7,058,310 (System and method for protecting eye safety during operation of a fiber optic transceiver), 6,952,531 (System and method for protecting eye safety during operation of a fiber optic transceiver), 7,162,160 (System and method for protecting eye safety during operation of a fiber optic transceiver), 7,050,720 (Integrated memory mapped controller circuit for fiber optics transceiver)

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.

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.