GLC-SX-MMD – 1000BASE-SX SFP – MMF 850nm – DOM
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GLC-SX-MMD Description
The GLC-SX-MMD is a Cisco 1000BASE-SX SFP transceiver for short multimode fiber links between Gigabit Ethernet switches inside a building. The module transmits at 850 nm over dual LC/PC connectors, reaches 220 m on 62.5 micron FDDI-grade fiber and 1000 m on 50 micron OM3, OM4 or OM5, and operates from -5 to 85°C with Digital Optical Monitoring. The module supports multimode fiber only and has no single-mode operation.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
GLC-SX-MMD |
|
Product type |
1000BASE-SX SFP transceiver |
|
Data rate |
1 Gigabit Ethernet |
|
Fiber type |
Multimode fiber |
|
Nominal wavelength |
850 nm |
|
Connector type |
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 |
|
Cisco ordering description |
1000BASE-SX short wavelength with DOM |
Application Scenarios
In a server room or office building, the module links an access switch in one rack to an aggregation switch in another over OM3 or OM4 multimode patching, with 850 nm links running up to 1000 m.
A wiring closet switch with a free SFP port can send its uplink up the existing 50 micron OM2 riser for up to 550 m, and Digital Optical Monitoring reports the transmit and receive power of that link.
Product Comparison
|
Parameter |
GLC-SX-MMD | ||
|---|---|---|---|
|
Interface standard |
1000BASE-SX |
1000BASE-SX |
1000BASE-LX/LH |
|
Fiber type |
Multimode fiber |
Multimode fiber |
Multimode fiber and single-mode fiber |
|
Wavelength |
850 nm |
850 nm |
1310 nm |
|
Operating distance |
220 m to 1000 m depending on MMF grade |
220 m to 1000 m depending on MMF grade |
550 m on MMF or 10 km on G.652 SMF |
|
Temperature range |
-5 to 85°C (EXT) |
-40 to 85°C (IND) |
-5 to 85°C (EXT) |
|
DOM support |
Yes |
Yes |
Yes |
GLC-SX-MMD is the extended-temperature 850 nm multimode model, rated -5 to 85 C and reaching 220 m to 1000 m depending on MMF grade, while GLC-SX-MM-RGD has the same SX optics and DOM, with 220 m to 550 m reach, in the industrial -40 to 85 C range, so unheated cabinets and outdoor enclosures that fall below -5 C need GLC-SX-MM-RGD. GLC-LH-SMD is the choice when the plant includes single-mode fiber or the link must cover 10,000 m over G.652 SMF at 1310 nm. On multimode fiber it reaches only 550 m and needs a mode-conditioning patch cord, so GLC-SX-MMD stays the simpler order for multimode-only links.
Ordering Checklist
- Installed fiber grade: Confirm the multimode grade on site: 220 m on 62.5 um FDDI-grade fiber, 550 m on OM2, 1000 m on OM3, OM4 or OM5. A longer run on older fiber will not link.
- Host support: Confirm the target switch or router model and its SFP port appear on the Transceiver Modules Compatibility list for GLC-SX-MMD. A host can reject an optic that fits the cage but is not on its supported list.
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | GLC-SX-MMD | Product type | 1000BASE-SX SFP transceiver |
| Cisco ordering description | 1000BASE-SX short wavelength with DOM | Data rate | 1 Gigabit Ethernet |
| IEEE standard | IEEE 802.3z 1000BASE-SX | Fiber type | Multimode fiber |
| Nominal wavelength | 850 nm | Wavelength range | 770 to 860 nm |
| Connector type | Dual LC/PC | DOM support | Yes |
| Temperature rating | EXT | Operating temperature | -5 to 85 C |
| Storage temperature | -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 |
Quality Certifications
Customer Reviews
Questions & Answers
-
How far can GLC-SX-MMD reach on each multimode fiber type?
-
What is the operating temperature range of GLC-SX-MMD?
-
Can a mode-conditioning patch cord extend the multimode reach of GLC-SX-MMD?
-
What is the spare PID for GLC-SX-MMD, and what else is in the order?
-
Does GLC-SX-MMD support DOM and what optical power range does it use?
-
Can GLC-SX-MMD link over single-mode fiber?
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