GLC-SX-MMD – 1000BASE-SX SFP – MMF 850nm – DOM
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GLC-SX-MMD Description
GLC-SX-MMD is a Cisco 1000BASE-SX SFP transceiver for 1-Gigabit Ethernet links over multimode fiber.
This SKU is the extended-temperature SX option with Digital Optical Monitoring support. Keep it separate from GLC-SX-MM-RGD when the BOM needs the non-rugged EXT model, and compare it with GLC-LH-SMD only when the fiber plant or reach requirement moves from SX multimode to LX/LH fiber support.
Before adding GLC-SX-MMD to a quote, confirm the Cisco host platform, software support, dual LC/PC patching, multimode fiber grade, link distance, and whether the operations team needs DOM readings from the target device.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
GLC-SX-MMD |
|
Brand |
Cisco |
|
Product family |
Cisco SFP modules for Gigabit Ethernet applications |
|
Product type |
1000BASE-SX SFP transceiver |
|
Ethernet rate |
1 Gigabit Ethernet |
|
Fiber type |
Multimode fiber |
|
Nominal wavelength |
850 nm |
|
Connector |
Dual LC/PC |
|
DOM support |
Yes |
|
Temperature range |
Extended temperature range -5 to 85 C |
|
Operating distance |
220 m to 1000 m depending on MMF grade |
|
Optical power range |
TX -3 to -9.5 dBm and RX 0 to -17 dBm |
|
Ordering description |
1000BASE-SX short wavelength with DOM |
Application Scenarios
Use GLC-SX-MMD for Cisco 1-Gigabit SFP ports where the installed path is multimode fiber and the documented SX reach covers the link distance.
This SKU fits teams that need Cisco SX optics with DOM support and a host platform that can report supported transceiver monitoring data.
Stock GLC-SX-MMD separately from rugged, LX/LH, EX, ZX, copper, and bidirectional SFP variants because those SKUs change temperature rating, fiber type, wavelength, reach, or connector behavior.
Product Comparison
|
Parameter |
GLC-SX-MMD |
GLC-SX-MM-RGD | |
|---|---|---|---|
|
Product family |
Cisco SFP modules for Gigabit Ethernet applications |
Cisco SFP modules for Gigabit Ethernet applications |
Cisco SFP modules for Gigabit Ethernet applications |
|
Product type |
1000BASE-SX SFP transceiver |
1000BASE-SX rugged SFP transceiver |
1000BASE-LX/LH SFP transceiver |
|
Ethernet rate |
1 Gigabit Ethernet |
1 Gigabit Ethernet |
1 Gigabit Ethernet |
|
Fiber type |
Multimode fiber |
Multimode fiber |
Multimode fiber and single-mode fiber |
|
Wavelength |
850 nm |
850 nm |
1310 nm |
|
Connector |
Dual LC/PC |
Dual LC/PC |
Dual LC/PC |
|
DOM support |
Yes |
Yes |
Yes |
|
Temperature range |
Extended temperature range |
Industrial temperature range |
Extended temperature range |
|
Operating distance |
220 m to 1000 m depending on MMF grade |
220 m to 1000 m depending on MMF grade |
Up to 550 m on MMF or 10 km on G.652 SMF |
|
Ordering description |
1000BASE-SX short wavelength with DOM |
1000BASE-SX short wavelength rugged |
1000BASE-LX/LH long wavelength with DOM |
- In a GLC-SX-MMD vs GLC-SX-MM-RGD comparison, the main difference is temperature positioning: GLC-SX-MMD is the EXT SX model, while GLC-SX-MM-RGD is the industrial rugged SX model.
- The GLC-SX-MMD vs GLC-LH-SMD difference is optical type. GLC-SX-MMD is the 850 nm multimode SX choice, while GLC-LH-SMD moves the order to LX/LH reach at 1310 nm with MMF and SMF support.
- For a GLC-SX-MMD comparison, which model to choose should start with fiber type, wavelength, temperature requirement, DOM requirement, and the Cisco host compatibility result.
Selection Guide
1. Choose it for Cisco SX multimode links
Select GLC-SX-MMD when the required Cisco optic is a 1000BASE-SX SFP for multimode fiber and the installed distance fits the Cisco cabling table.
2. Use the rugged SX SKU only for industrial temperature needs
Choose GLC-SX-MM-RGD instead when the official BOM calls for the industrial rugged 1000BASE-SX part number rather than the extended-temperature DOM model.
3. Move to LX/LH when the fiber plan changes
Review GLC-LH-SMD when the design requires 1310 nm LX/LH behavior, single-mode support, or the documented 10 km G.652 SMF reach.
4. Validate platform support before purchase
Confirm the exact Cisco switch, router, module slot, software release, and DOM behavior in Cisco compatibility documentation before releasing the GLC-SX-MMD line item.
Ordering Checklist
|
Check Item |
What to Confirm |
Procurement Risk Controlled |
|---|---|---|
|
Exact product ID |
GLC-SX-MMD on the quote and receiving label |
Prevents substitution with copper, LX/LH, EX, ZX, rugged, or older SX variants |
|
Host compatibility |
Cisco platform, SFP port, module slot, and software support |
Keeps the optic tied to Cisco compatibility data |
|
Fiber plant |
Multimode fiber grade and installed distance |
Matches the order to the documented SX reach table |
|
Connector plan |
Dual LC/PC patch cords at both ends |
Avoids connector mismatch during installation |
|
DOM requirement |
Target host support for DOM readouts |
Aligns monitoring expectations with the exact SFP model |
|
Far-end optic |
Compatible 1000BASE-SX optic and matching wavelength |
Reduces link-up issues caused by mixed optical types |
Specifications
Packaging weight and dimensions included:| Weight | 0.25 kg |
|---|---|
| Dimensions | 16 × 12 × 4 cm |
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Brand | Cisco | Product ID | GLC-SX-MMD |
| Product family | Cisco SFP modules for Gigabit Ethernet applications | Product type | 1000BASE-SX SFP transceiver |
| Ordering description | 1000BASE-SX short wavelength with DOM | Ethernet rate | 1 Gigabit Ethernet |
| IEEE standard | IEEE 802.3z 1000BASE-SX | Fiber type | Multimode fiber |
| Nominal wavelength | 850 nm | Transmit and receive wavelength range | 770 to 860 nm |
| Connector | Dual LC/PC | DOM support | Yes |
| Temperature rating | EXT | Operating temperature range | -5 to 85 C |
| Storage temperature range | -40 to 85 C | Typical SFP power consumption | Up to 1 W per SFP port |
| Transmit power range | -3 to -9.5 dBm | Receive power range | 0 to -17 dBm |
| Maximum channel insertion loss | 2.4 to 5 dB depending on MMF grade | 62.5 micron FDDI-grade reach | 220 m |
| 62.5 micron OM1 reach | 275 m | 50 micron 400/400 reach | 500 m |
| 50 micron OM2 reach | 550 m | 50 micron OM3 OM4 OM5 reach | 1000 m |
| Module dimensions | 8.5 x 13.4 x 56.5 mm | Module weight | 75 g or less |
| Laser safety | Class I | Standard Cisco warranty | 5 years |
Get More Information
Need pricing, stock, or shipping details for the GLC-SX-MMD ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email sales@layer23-switch.com for a fast quotation.
Quality Certifications
Customer Reviews
Questions & Answers
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What is GLC-SX-MMD used for on 850 nm MMF?
-
How far can GLC-SX-MMD reach?
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Is GLC-SX-MMD for single-mode fiber?
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What connector does GLC-SX-MMD use?
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Does GLC-SX-MMD have DOM?
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When does GLC-SX-MMD fit better than GLC-LH-SMD?
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Can GLC-SX-MMD run over copper cabling?
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What dual LC and EXT temperature details matter for GLC-SX-MMD?
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