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Short range fiber SFP with consistent links.
GLC-SX-MMD
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GLC-SX-MMD (Cisco 1000BASE-SX SFP Transceiver Module, 850nm/550m/MMF/LC/DOM)
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- Brand:
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- GTIN:
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- List Price:
$590.00
- Price:
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GLC-SX-MMD Overview
GLC-SX-MMD uses the Small Form-Factor Pluggable form factor for insertion into compatible Gigabit Ethernet module sockets and network equipment slots. Its electrical-to-optical interface carries 1 Gbps traffic on the 1000BASE-SX link specification for Gigabit Ethernet signaling operations. The optical path uses multi-mode fiber as the physical medium for installed links across supported core sizes and bandwidth grades. Dual LC/PC optical connectors present transmit and receive strands using PC or UPC patch cords. The transmit and receive optical wavelength operates in the 850 nm short-wavelength band used by 1000BASE-SX optics. Maximum reach extends to 550 m on 50-micron cable with 500 MHz*km modal bandwidth for compliant channel operation. Cisco assigns the Extended operating temperature class to this SFP for supported Cisco platforms. Digital Optical Monitoring support provides real-time operating parameter access for link diagnostics through host management interfaces.
With VCSEL transmitter technology, GLC-SX-MMD generates the optical source required for serial signaling over installed channels. The PIN receiver converts incoming optical signals into electrical receive data for the host interface across the receive side. TX power range delivers -9.5 dBm minimum to -3 dBm maximum across the 1000BASE-SX optical output during normal operation. RX sensitivity reaches -17 dBm at the lowest receive power value in the specified receive range for guaranteed operation. With 8b/10b encoding, the line code maps eight-bit data groups into ten-bit transmission symbols for 1000BASE-X operation. RX overload point accepts 0 dBm as the maximum receive power value before receiver saturation under the optical parameters. IEEE 802.3z, IEEE 802.3ah, and SFF-8472 govern Ethernet operation, physical-layer compatibility, and diagnostic monitoring requirements. With 3.1 to 3.5 V supply voltage range, the module runs from the SFP host electrical power rail. At 1 W maximum power consumption, the port budget matches the typical SFP power requirement per interface.
Compatible platform families span Cisco Catalyst 2960-X, Catalyst 3560, Catalyst 3850, Catalyst 4500, Catalyst 6800, and Nexus 9000 Series. Additional platform families span Cisco ASR 1000, ASR 9000, ASA5500, MDS 9000, ME 3400, and NAM 2200 Series. Deployment environments place the module in enterprise campus access, distribution uplinks, wiring closets, and data center aggregation rows. OM2 cable grade matches the required grade for the stated channel distance in standard installed channels. Shop GLC-SX-MMD online from ORM Systems in new and certified refurbished condition. Certified refurbished stock passes ORM Systems inspection and functional testing before shipment. Check price with ORM Systems for current stock, lead time, and procurement-ready purchasing support. ORM Systems supplies purchase support for refresh projects, network expansions, maintenance spares, and lifecycle replacement planning. Price requests with ORM Systems align project quantities, sparing needs, and replenishment orders. Request bulk quotation from ORM Systems for enterprise and volume buyers.
GLC-SX-MMD price is $57.00, a 90.3% saving from the Cisco list price of $590.00. GLC-SX-MMD is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for GLC-SX-MMD for additional pricing. Browse the full Sfp series or explore all Cisco products.
GLC-SX-MMD Specifications
- Product Type
- Optical Transceiver
- Brand
- Cisco
- Series
- 1000BASE-SX SFP
- Compatible OEM Part
- N/A
- Use Case
- Enterprise Campus
- Form Factor
- SFP
- Data Rate
- 1 Gbps
- Protocol
- Ethernet
- Fiber Type
- Multi-Mode (MMF)
- Connector Type
- LC Duplex
- Wavelength TX
- 850 nm
- Wavelength RX
- 850 nm
- Reach
- 550 m (OM2)
- Cable Standard
- OM2
- Transmitter Type
- VCSEL
- Receiver Type
- PIN
- TX Power Min
- -9.5 dBm
- TX Power Max
- -3 dBm
- RX Sensitivity
- -17 dBm
- RX Power Max
- 0 dBm
- Encoding
- 8b/10b
- Supported Standards
- IEEE 802.3z / IEEE 802.3ah / SFF-8472
- DDM/DOM Support
- Yes
- Power Consumption
- 1 W
- Supply Voltage
- 3.1 to 3.5 V
- Operating Temperature
- Extended (-5°C to 85°C)
- Compatible Platforms
- Cisco Catalyst 2960-X / Cisco Catalyst 3560 / Cisco Catalyst 3850 / Cisco Catalyst 4500 / Cisco Catalyst 6800 / Cisco Nexus 9000 / Cisco ASR 1000 / Cisco ASA5500 / Cisco MDS 9000
- Certifications
- CE / RoHS
- Height
- 8.5 mm
- Width
- 13.4 mm
- Depth
- 56.5 mm
- Weight
- 0.075 kg
GLC-SX-MMD Use Case
Access Stack Uplink to Distribution
The GLC-SX-MMD serves as the Gigabit uplink from an access switch or access stack into a nearby distribution switch over multimode fiber. The SFP port uses 1000BASE-SX at 850 nm with dual LC connectivity, and the access configuration carries VLAN trunks, voice/data segmentation, or routed access links within the 550 m legacy 50 micron MMF design envelope. DOM readings give operations teams optical power and temperature data during acceptance testing. The access layer gains a fiber uplink that preserves existing multimode cabling while moving copper patching out of the riser path.
Distribution Switch Interconnect
GLC-SX-MMD fits short distribution-layer interconnects where adjacent network rooms or cabinets already share multimode fiber. Each switch terminates a 1000BASE-SX SFP on a dual LC pair, and the link carries a routed point-to-point connection, an L2 trunk, or a controlled aggregation member between distribution devices. The 850 nm SX optic aligns with MMF plant used inside buildings rather than long-reach single-mode spans. The interconnect gives the distribution layer a known Gigabit Ethernet path with optical telemetry available for fault isolation and capacity planning.
Management Plane Fiber Extension
In a management-plane design, the GLC-SX-MMD connects a switch SFP port to an out-of-band aggregation switch over local multimode fiber. The 1000BASE-SX link separates management traffic from copper user access runs, while dual LC MMF patching places the management switch in a different rack or room within the SX reach profile. DOM data supports checks of receive power before management VLANs, TACACS, SNMP, and syslog paths are accepted into service. The operations plane gains a dedicated fiber segment for device administration and event collection.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| GLC-SX-MMD |  GLC-FE-100FX48 |  SFP-OC12-SR= |  SFP-OC12-SR | |
|---|---|---|---|---|
| Product Type | Optical Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | SFP | SFP | SFP | SFP |
| Data Rate | 1 Gbps | 100 Mbps | OC-12 | OC-12 |
| Connector Type | LC Duplex | LC Duplex | LC | LC |
| Wavelength | 1300 nm | 1310 nm | 1310 nm | |
| Transmission Distance | Short-Range | Short-Range | Short-Range | |
| Fiber Type | Multi-Mode (MMF) | Multi-mode | Single-mode | Multi-mode |
| Max Distance | 2000 m | 10 km | 300 meters | |
| Supported Protocols | Ethernet | SONET, OC-12 | SONET / OC-12 | |
| Network Interface | Fiber | Fiber | Fiber | |
| Power Consumption | 1 W | N/A | 1.5W | N/A |
| Operating Temperature | Extended (-5°C to 85°C) | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | |
| Input Voltage | 3.3V | 3.3V | 3.3V | |
| Compatibility | Cisco | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | |
| Product Name | GLC-FE-100FX48 | SFP-OC12-SR= | SFP-OC12-SR | |
| Height | 8.5 mm | N/A | 0.30 inches | N/A |
| Width | 13.4 mm | N/A | 0.55 inches | N/A |
| Depth | 56.5 mm | N/A | 0.75 inches | N/A |
| Weight | 0.075 kg | N/A | 0.08 lbs | N/A |
Reviews & Ratings
A
Ayesha Parveen
4
Easy installation and stable signal.
J
Julien Marchand
5
Reliable for campus networks.
T
Talha Noor
4
No errors observed.
G
Grace Powell
5
Good value.
Questions & Answers
What data rate does the GLC-SX-MMD support?
The GLC-SX-MMD supports a data rate of 1 Gbps (1000BASE-SX), ideal for gigabit Ethernet applications over multimode fiber.
What is the Cisco GLC-SX-MMD?
The Cisco GLC-SX-MMD is a 1 Gigabit SFP transceiver module for multimode fibre connections up to 550 metres. It operates at 850nm, uses an LC duplex connector, and supports Digital Optical Monitoring. The GLC-SX-MMD is part of Cisco's 1000BASE-SX product line and is one of the most commonly deployed 1G SFP modules across Cisco campus and enterprise switch environments worldwide.
What does GLC-SX-MMD stand for?
GLC stands for Gigabit LAN Card, SX indicates short-wavelength operation on multimode fibre, MM refers to the multimode fibre type, and D denotes Digital Optical Monitoring support. The D suffix distinguishes the GLC-SX-MMD from its predecessor, the GLC-SX-MM, which did not include DOM capability. This naming convention is used consistently across Cisco's 1G SFP optics range to signal DOM availability.
Is the GLC-SX-MMD a 1G or 10G module?
The GLC-SX-MMD is a 1 Gigabit (1000 Mbps) SFP module conforming to the 1000BASE-SX standard. It is not a 10G SFP+ module. For 10 Gigabit connectivity, Cisco offers separate SFP+ modules such as the SFP-10G-SR for multimode fibre. The GLC-SX-MMD is suited to 1G access and distribution layer deployments where 10G throughput is not yet required and existing infrastructure is 1G-capable.
Where does the GLC-SX-MMD sit in Cisco's 1G SFP optics range?
The GLC-SX-MMD is the short-reach multimode variant in Cisco's 1G SFP lineup. For longer distances, the GLC-LH-SMD covers 10km over single-mode fibre and the GLC-EX-SMD extends to 40km. For copper 1G SFP connectivity, the GLC-TE is the relevant module. The GLC-SX-MMD is the correct choice when multimode fibre is in place and links stay within 550 metres.
What is the maximum reach of the GLC-SX-MMD?
The GLC-SX-MMD reaches up to 550 metres over OM2 50-micron multimode fibre. On older OM1 62.5-micron multimode fibre, maximum reach is reduced to 275 metres due to higher modal dispersion. On OM3 or OM4 50-micron laser-optimised fibre, 550 metres is reliably achievable. Before purchasing, confirm your fibre type so you can accurately assess whether the GLC-SX-MMD will cover your link distances.
What fibre type is required for the GLC-SX-MMD?
The GLC-SX-MMD requires multimode fibre. It is compatible with OM1 (62.5/125 micron), OM2, OM3, and OM4 (50/125 micron) multimode fibre types. It is not compatible with single-mode fibre. Connecting an 850nm module to single-mode cabling results in severe signal loss and link failure due to the difference in core diameter and numerical aperture. Always confirm your cabling type before ordering.
What connector type does the GLC-SX-MMD use?
The GLC-SX-MMD uses an LC duplex connector, which is the standard connector for SFP modules in enterprise environments. LC connectors are small form-factor and widely available as patch cables in both OM1 and OM2/OM3/OM4 multimode variants. Patch cables connecting to the GLC-SX-MMD must be LC-to-LC with multimode fibre to match the 850nm optical properties of the module.
Does the GLC-SX-MMD support Digital Optical Monitoring?
Yes, the D in GLC-SX-MMD explicitly indicates DOM support. DOM allows Cisco switches and routers to report real-time optical diagnostics for the module, including transmit power, receive power, laser bias current, temperature, and supply voltage. These readings are accessible via "show interfaces transceiver" on compatible Cisco IOS versions and are useful for diagnosing weak fibre connections, dirty connectors, or ageing modules without physical inspection.
What wavelength does the GLC-SX-MMD operate at?
The GLC-SX-MMD transmits and receives at 850nm, the standard wavelength for 1000BASE-SX short-range multimode fibre transceivers. The 850nm source is produced by a VCSEL (Vertical Cavity Surface Emitting Laser), which is cost-effective, reliable, and well-matched to the optical properties of OM1 and OM2 multimode fibre at Gigabit speeds. Both ends of the fibre link use 850nm, so the modules on each end must both be 1000BASE-SX.
What is the GLC-SX-MMD used for?
The GLC-SX-MMD is used to provide 1 Gigabit Ethernet connectivity over multimode fibre runs within a building or between nearby buildings. Common deployments include access-to-distribution switch uplinks, wiring closet inter-switch connections, and backbone links in buildings where multimode fibre infrastructure is already in place. It is a practical choice wherever 1G throughput is sufficient and the fibre distance stays within 550 metres.
Is the GLC-SX-MMD suitable for campus network deployments?
Yes, the GLC-SX-MMD is a standard choice for campus networks with existing multimode fibre cabling. It is commonly used on uplinks between floor switches and wiring closet distribution switches, and on building backbone connections where OM2 cabling is in place and distances remain within 550 metres. Its low cost and broad Cisco platform compatibility make it practical for large-scale campus switch deployments requiring many fibre-connected links.
Can the GLC-SX-MMD be used for server-to-switch fibre connectivity?
Yes, the GLC-SX-MMD can provide 1G fibre connectivity between a server and a switch where the server has a 1G SFP port and multimode fibre is the cabling medium. However, most modern server deployments prefer 10G or higher for server-to-switch links, so the GLC-SX-MMD is more typically deployed in switch-to-switch or uplink roles. It remains relevant in environments where 1G server connectivity is adequate and multimode fibre is already installed.
Is the GLC-SX-MMD appropriate for wiring closet inter-switch links?
Yes, this is one of the most common use cases for the GLC-SX-MMD. Connecting distribution and access switches via fibre across floors or between rooms is a typical deployment scenario, particularly in buildings with older OM1 multimode cabling. The 275-metre reach on OM1 covers most inter-floor distances within a standard office building, and on OM2 the 550-metre reach handles larger facilities without difficulty.
What Cisco switches and routers support the GLC-SX-MMD?
The GLC-SX-MMD is compatible with Cisco Catalyst 2960, 2960X, 2960CX, 3560, 3750, 3850, 4500, 4500X, 6500, and 6800 series switches, as well as Cisco ISR 2900, 3900, and 4000 series routers and select Cisco ASA firewall models. Compatibility varies by platform model and IOS version. Verify against Cisco's compatibility matrix for your specific device before ordering, particularly for newer Catalyst 9000 series platforms.
Does the GLC-SX-MMD work with Cisco Catalyst 9000 series switches?
Compatibility between the GLC-SX-MMD and Catalyst 9000 series switches depends on the specific 9000 model and IOS-XE version. Some Catalyst 9000 platforms support legacy 1G SFP modules including the GLC-SX-MMD. Others may have slot restrictions or software requirements that limit legacy SFP support. Check Cisco's transceiver compatibility matrix for your exact Catalyst 9000 model and firmware version before purchasing.
Can the GLC-SX-MMD be used with non-Cisco equipment?
The GLC-SX-MMD is encoded for Cisco platforms and is not designed for use in switches or routers from Juniper, HPE Aruba, Huawei, or other vendors. Those platforms require transceivers programmed with their own vendor identifiers. Using a Cisco-encoded SFP in non-Cisco equipment typically results in the module not being recognised or a port error. For multi-vendor environments, third-party compatible modules programmed for each specific platform are the correct solution.
Is the GLC-SX-MMD compatible with the older GLC-SX-MM on the same link?
Yes, the GLC-SX-MMD and GLC-SX-MM are optically interoperable on the same fibre link. Both operate at 850nm conforming to the 1000BASE-SX standard. You can install a GLC-SX-MMD at one end of a run and a GLC-SX-MM at the other without any optical mismatch. The only practical difference is that the GLC-SX-MMD end provides DOM data while the GLC-SX-MM end does not.
What is the difference between the GLC-SX-MMD and the GLC-SX-MM?
The GLC-SX-MMD is the updated version of the GLC-SX-MM with the addition of DOM support, which the D suffix signifies. Both modules are optically identical: 850nm, 1000BASE-SX, up to 550m over OM2 multimode fibre. The GLC-SX-MMD is the current recommended module and should be specified for all new orders. The GLC-SX-MM is an older variant and the GLC-SX-MMD is its direct replacement.
What is the difference between the GLC-SX-MMD and the GLC-LH-SMD?
The GLC-SX-MMD is for short-reach multimode fibre up to 550 metres at 850nm. The GLC-LH-SMD is for long-haul single-mode fibre up to 10 kilometres at 1310nm. The choice depends on your fibre type and link distance. For buildings with existing multimode cabling at short distances, the GLC-SX-MMD is correct. For single-mode fibre or distances beyond 550 metres, the GLC-LH-SMD is the appropriate module.
Should I use the GLC-SX-MMD or upgrade to a 10G SFP+ module?
The GLC-SX-MMD remains the right choice if your switch platforms are 1G-rated, your fibre is OM1 or OM2, and your current traffic volumes do not require 10G throughput. If your switches already have 10G SFP+ uplink ports and your fibre is OM3 or OM4, upgrading to the SFP-10G-SR provides better long-term bandwidth headroom. For standard user access-layer links, 1G is still sufficient in many deployments and the GLC-SX-MMD delivers this reliably.
How does the GLC-SX-MMD compare to the GLC-EX-SMD?
The GLC-SX-MMD is a short-reach 850nm multimode module with a 550-metre maximum reach. The GLC-EX-SMD is an extended-reach 1310nm single-mode module reaching 40 kilometres. These serve completely different deployment scenarios. The GLC-SX-MMD is for intra-building or short campus links over existing multimode cabling. The GLC-EX-SMD is for long-distance metro and campus connections on single-mode fibre where the GLC-LH-SMD's 10km reach is not enough.
Is the GLC-SX-MMD available new and refurbished?
Yes, the GLC-SX-MMD is available in both new and certified refurbished condition from ORM Systems. Refurbished units are tested before dispatch, confirming optical output, DOM functionality, and physical integrity are within specification. Refurbished 1G SFP modules are particularly cost-effective for large-scale campus deployments or for replacing failed modules in older Cisco infrastructure where buying new is not commercially justified at scale.
What is the price of the GLC-SX-MMD?
Pricing for the GLC-SX-MMD depends on condition and order quantity. ORM Systems offers competitive pricing on both new and refurbished stock, with volume discounts available for bulk orders. For the current price, visit the GLC-SX-MMD product page on ormsystems.com or contact the ORM Systems sales team for a formal quote, particularly if you are procuring multiple units for a switch refresh or campus rollout.
Is the GLC-SX-MMD still in production?
The GLC-SX-MMD remains an active product in Cisco's portfolio and is widely available as new stock. The 1000BASE-SX standard it serves continues to be deployed across enterprise networks where 1G multimode fibre infrastructure is in place. ORM Systems stocks both new and refurbished units, providing options for organisations replacing failed modules on existing switches as well as those building new 1G SFP-based infrastructure.
Can I order the GLC-SX-MMD in bulk for a campus rollout?
Yes, ORM Systems accepts bulk orders for the GLC-SX-MMD and provides volume pricing for large quantity requirements. Campus network projects and switch refresh programmes often require large numbers of identical 1G SFP modules, and ORM Systems is set up to handle this efficiently. Contact the sales team directly or use the bulk quotation form on the product page with your quantity and project timeline for a tailored response.
What are the lead times for the GLC-SX-MMD from ORM Systems?
Lead times for the GLC-SX-MMD depend on current stock levels and delivery destination. ORM Systems ships from UK, USA, UAE, and Netherlands locations, which supports fast regional fulfilment. In-stock units are dispatched promptly. For large volume orders or time-sensitive projects, confirm availability with the ORM Systems sales team before placing the order to ensure the quantity and lead time align with your project schedule.
What warranty does the GLC-SX-MMD come with from ORM Systems?
New Cisco GLC-SX-MMD units carry the standard Cisco hardware warranty. Refurbished units sold by ORM Systems are covered under the ORM Systems warranty, protecting against hardware defects identified after delivery. For exact warranty terms and duration applicable to your specific order, check the product listing on ormsystems.com or contact ORM Systems directly before purchasing, as terms can differ between new and refurbished stock.
Is a refurbished GLC-SX-MMD tested before it is shipped?
Yes, refurbished GLC-SX-MMD units at ORM Systems are tested before dispatch. Testing verifies optical transmit power, receive power, DOM data accuracy, and physical condition of the module and LC connector. This confirms the module is within Cisco's operational specification and will function correctly in a supported Cisco platform without triggering interface errors or link instability after installation.
What compliance certifications does the GLC-SX-MMD carry?
The Cisco GLC-SX-MMD meets FCC Class A and CE electromagnetic compatibility standards and is RoHS compliant. It conforms to IEEE 802.3z 1000BASE-SX and the SFP Multi-Source Agreement. These certifications confirm it is suitable for use in enterprise, education, and government environments operating under UK, EU, and US regulatory requirements for IT hardware and electronic equipment.
How do I install the GLC-SX-MMD in a Cisco switch?
Insert the GLC-SX-MMD into an available SFP slot on the Cisco switch with the label side up until it clicks into place. Remove the dust cap and connect an LC multimode patch cable. The switch detects the module automatically without a reboot. Confirm detection with "show interfaces" or "show inventory." The interface comes up once both ends are connected, the far-end device is active, and the fibre path is properly terminated.
Does the GLC-SX-MMD require any Cisco IOS configuration after installation?
No special configuration is required. The GLC-SX-MMD is automatically detected by Cisco IOS and IOS-XE on insertion. Apply standard interface configuration such as "no shutdown" and any VLAN or speed settings needed for your deployment. DOM diagnostics are available via "show interfaces transceiver" on compatible IOS versions without additional setup. The module is plug-and-play on all supported Cisco platforms.
Does the GLC-SX-MMD require a licence to activate?
No licence is required to operate the GLC-SX-MMD. It is a hardware module that activates automatically when inserted into a compatible Cisco SFP port. Cisco licensing applies to software features such as routing tiers, advanced security, and SD-Access, not to physical optical hardware. The GLC-SX-MMD will function on any compatible, supported port immediately after installation.
Where can I buy the GLC-SX-MMD in the UK?
The GLC-SX-MMD is available from ORM Systems at ormsystems.com. ORM Systems is a UK-based B2B IT hardware reseller with UK-based fulfilment, making it a practical source for businesses needing genuine Cisco SFP modules delivered promptly. Both new and refurbished units are available with competitive pricing, and bulk order options are listed on the product page for network teams procuring larger quantities.
Does ORM Systems ship the GLC-SX-MMD internationally?
Yes, ORM Systems ships the GLC-SX-MMD internationally from fulfilment locations in the UK, USA, UAE, and Netherlands. This allows ORM Systems to serve customers across Europe, North America, the Middle East, and other regions with faster regional lead times. Contact the ORM Systems sales team for delivery timelines and any import documentation requirements specific to your country before placing an international order.