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Cisco GLC-SX-MMD Compatible 1000BASE-SX SFP
Add a Cisco GLC-SX-MMD compatible 1GbE multimode fibre link using an 850nm LC duplex SFP with DDM and up to 550m reach.

1000BASE-SX Gigabit Ethernet
Delivers a verified 1GbE optical link with a 1.25Gbps line rate for compatible SFP networking equipment.
850nm LC duplex
Matches multimode fibre links using the specified wavelength and connector type.
Reach: Up to 550m
Designed for the stated maximum distance when installed with the correct fibre type and within the network's optical budget.
DDM and hot-swap support
Digital Diagnostics Monitoring is yes and the module is hot-swappable in compatible equipment.
Why this model fits the job
Add a Cisco GLC-SX-MMD compatible 1GbE multimode fibre link using an 850nm LC duplex SFP with DDM and up to 550m reach. The design focuses on the exact connector, signalling and compatibility requirements shown in the current StarTech.com specification, helping buyers select the right part without relying on broad compatibility claims.
Compatibility checklist
- Confirm the host accepts a Cisco GLC-SX-MMD compatible or appropriate MSA-coded SFP module.
- Match the remote transceiver's speed, 850nm wavelength, multimode fibre, LC duplex connector and DDM requirement.
- Confirm the optical link budget and installed fibre support the required distance; up to 550m is the stated maximum.
Common applications
- Extend a switch-to-switch Gigabit Ethernet backbone
- Connect a compatible router, switch or media converter to fibre
- Replace or standardise the specified Cisco-compatible SFP module
DeviceDeal purchase confidence
Supplied by DeviceDeal for Australian customers with local purchasing support, a tax invoice and the verified Lifetime StarTech.com manufacturer warranty.
Frequently asked questions
What is this transceiver used for?
It adds a 1000BASE-SX 1GbE optical connection to a compatible SFP port.
Which Cisco module is it compatible with?
It is designed, programmed and tested as a replacement for Cisco GLC-SX-MMD.
What fibre and connector are required?
Use multimode fibre with an LC duplex connection.
What wavelength does it use?
The module operates at 850nm. The remote optic must use a compatible wavelength and Ethernet standard.
What is the maximum distance?
The stated maximum reach is up to 550m. Actual design must also satisfy the optical link budget.
Does it support DDM?
Digital Diagnostics Monitoring support is yes.
Is it hot-swappable?
Yes, it is hot-swappable when installed in networking equipment that supports hot swapping.
What is included and what warranty applies?
1 module is supplied, backed by a lifetime StarTech.com manufacturer warranty.
Not sure this is the right product for your setup? Visit the DeviceDeal Buying Guides.
(GLCSXMMDST)
Features and highlights
- Cisco GLC-SX-MMD compatible SFP transceiver
- 1000BASE-SX Gigabit Ethernet; 1.25Gbps line rate
- Multimode fibre; LC duplex connector
- 850nm optical wavelength
- Up to 550m maximum stated reach
- Digital Diagnostics Monitoring (DDM): Yes
- Hot-swappable in compatible networking equipment
- MTBF: 3,381,761 hours
- Power consumption: Less than 1W
- Operating temperature: 0°C to 70°C
- Product dimensions: 56.6 × 14 × 12mm
- Package includes 1 module
- Lifetime StarTech.com manufacturer warranty
Specifications
| Product type | Cisco GLC-SX-MMD Compatible 1000BASE-SX SFP |
|---|---|
| OEM compatibility | Cisco GLC-SX-MMD |
| Ethernet standard | 1000BASE-SX |
| Maximum data rate | 1.25Gbps line rate / 1GbE network |
| Media type | Multimode fibre |
| Connector | LC duplex |
| Wavelength | 850nm |
| Maximum transfer distance | Up to 550m |
| Digital Diagnostics Monitoring | Yes |
| Duplex mode | Full duplex |
| Hot-swappable | Yes, in compatible equipment |
| MTBF | 3,381,761 hours |
| Power consumption | Less than 1W |
| Operating temperature | 0°C to 70°C |
| Storage temperature | -40°C to 85°C |
| Humidity | 595% RH |
| Colour / material | Silver aluminium |
| Dimensions | 56.6 × 14 × 12mm |
| Product weight | 15g |
| Package contents | 1 module |
| Host requirement | MSA-compliant or compatible Cisco SFP port |
| Warranty | Lifetime |
| SKU | GLCSXMMDST |
| Barcode # | 65030868587 |
| Brand | Startech |
| Shipping Weight | 0.0400kg |
| Shipping Width | 0.100m |
| Shipping Height | 0.050m |
| Shipping Length | 0.100m |
| Shipping Cubic | 0.000500000m3 |
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