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GLC-SX-MMD
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GLC-SX-MMD (Cisco 1000BASE-SX Gigabit Ethernet SFP Transceiver Module, 550m, MMF, LC, DOM, 850nm)
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- Cisco
- GTIN:
- 0882658340895
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GLC-SX-MMD Overview
GLC-SX-MMD is a Cisco 1000BASE-SX Gigabit Ethernet SFP transceiver module for optical Gigabit Ethernet ports and slots. The hot-swappable module uses the SFP form factor and inserts into supported Cisco Gigabit Ethernet interfaces. Its line interface uses 1.25 Gbps optical signaling for 1000BASE-SX Ethernet operation on standards-based links. The optical medium is multi-mode fiber for short-wavelength SX transmission inside Cisco 1G network equipment. Its front interface uses a dual LC/PC connector for paired transmit and receive strands at the module faceplate. The optical path uses an 850 nm nominal wavelength across both transmit and receive directions. Cisco rates the 1000BASE-SX distance at 550 m on OM2-grade 50-micron cabling. The module uses the Extended operating temperature class across the supported Cisco SFP operating range. Digital Optical Monitoring reports optical power, temperature, laser bias, and supply voltage through compatible Cisco platform diagnostics.
GLC-SX-MMD follows the 1000BASE-SX optical power profile for Cisco Gigabit Ethernet SFP modules. TX power range delivers -9.5 dBm to -3 dBm at the optical transmitter. RX sensitivity reaches -17 dBm at the receive threshold. RX overload tolerates 0 dBm before maximum receive power is exceeded. Receive power range spans -17 dBm to 0 dBm for guaranteed operation. Channel insertion loss permits 3.6 dB on OM2 and 5 dB on higher laser-optimized grades. With IEEE 802.3z, the module follows standards-based Gigabit Ethernet physical-layer operation. SFF-8472 aligns monitored diagnostics with optical power, temperature, laser bias, and module voltage reporting. At each populated SFP port, Cisco SFP modules typically consume 1 W or less. The module body uses Cisco SFP dimensions of 8.5 mm height, 13.4 mm width, and 56.5 mm depth. Cisco SFP modules typically weigh 75 g or less across the product family. Cisco warranty coverage assigns five years to the SFP product family.
Cisco platform support covers Catalyst 2960-X, Catalyst 3850, Catalyst 4500, and Catalyst 6800 families. Nexus 3000, Nexus 5000, Nexus 7000, and Nexus 9000 families also appear in Cisco platform support. Cisco ASR 1000 and Cisco ISR 2900 families add router-side platform coverage for SX handoffs. Network teams place this optic in enterprise campus, data centre aggregation, access uplink, and edge handoff environments. OM2 supports the 550 m purchasing baseline, while OM3, OM4, and OM5 support longer Cisco-rated SX spans. Buy GLC-SX-MMD from ORM Systems in new and certified refurbished condition for Cisco 1G optical refreshes. Certified refurbished stock receives functional testing, optical inspection, and platform recognition checks before dispatch. Order GLC-SX-MMD online from ORM Systems, check price, or request a quote for live availability. ORM Systems provides bulk quotation for enterprise and volume buyers standardising Cisco SX spare inventory across sites.
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
- Cisco 1-Gbps SFP
- Use Case
- Data Center / Enterprise Campus / Edge
- Form Factor
- SFP
- Data Rate
- 1.25 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
- TX Power Min
- -9.5 dBm
- TX Power Max
- -3 dBm
- RX Sensitivity
- -17 dBm
- RX Power Max
- 0 dBm
- Supported Standards
- IEEE 802.3z / SFF-8472
- DDM/DOM Support
- Yes
- Power Consumption
- 1 W
- Operating Temperature
- Extended (-5°C to 85°C)
- Compatible Platforms
- Cisco Catalyst 2960-X / Cisco Catalyst 3850 / Cisco Catalyst 4500 / Cisco Catalyst 6800 / Cisco Nexus 3000 / Cisco Nexus 5000 / Cisco Nexus 7000 / Cisco Nexus 9000 / Cisco ASR 1000 / Cisco ISR 2900
- Height
- 8.5 mm
- Width
- 13.4 mm
- Depth
- 56.5 mm
- Weight
- 0.075 kg
GLC-SX-MMD Use Case
Access Closet Fiber Uplink
GLC-SX-MMD sits in a Cisco access switch SFP slot and carries 1G uplink traffic over duplex LC multimode fiber toward the distribution layer. Engineers install a matching 1000BASE-SX optic at the far end, patch the 850nm MMF path, and configure the host switch port as a trunk, routed interface, or EtherChannel member. DOM readings on supported platforms expose optical power and temperature during turn-up. The result is a short-reach fiber handoff that keeps copper endpoint switching separate from the upstream aggregation path.
Distribution Layer Short-Reach Interconnect
GLC-SX-MMD operates in Cisco distribution or aggregation platforms where 1G 1000BASE-SX links join nearby switches across building fiber. The module uses multimode cabling within SX distance limits, with 550m support on 50-micron fiber and longer operation where Cisco-supported laser-optimized cabling applies. Engineers pair the optic with another SX interface, then place VLAN trunks or routed links on the host ports for predictable forwarding. The result is predictable Gigabit Ethernet transport across existing MMF plant without redesigning the link for single-mode optics.
Operations Spares and Optical Monitoring
GLC-SX-MMD supports an operations spare pool for Cisco networks that standardize on 1G SX multimode uplinks. Technicians replace failed or suspect short-reach optics with the same SKU, preserve LC duplex patching, and use DOM values from supported switches or routers to compare transmit power, receive power, and module temperature during incident triage. Inventory teams separate this DOM SX optic from GLC-LH-SMD, GLC-T, and rugged variants. The result is faster restoration and cleaner fault isolation across repeated access and distribution links.
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Product Comparison Table 
| GLC-SX-MMD |  GLC-FE-100FX48 |  SFP-OC12-SR | |
|---|---|---|---|
| Product Type | Optical Transceiver | Transceiver | Transceiver |
| Form Factor | SFP | SFP | SFP |
| Data Rate | 1.25 Gbps | 100 Mbps | OC-12 |
| Connector Type | LC Duplex | LC Duplex | LC |
| Fiber Type | Multi-Mode (MMF) | Multi-mode | Multi-mode |
| Operating Temperature | Extended (-5°C to 85°C) | 0 to 70°C | 0 to 70°C |
Compliance & Warranty
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Up to 3-Year Warranty Coverage
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
Hassle-Free RMA & Returns
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Rigorously Tested & Quality Assured
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Expert Technical Support
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
Fast Global Delivery
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reviews & Ratings
D
Duncan Reid
4
Short range fiber SFP with consistent links.
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 is Cisco GLC-SX-MMD?
Cisco GLC-SX-MMD is a 1000BASE-SX Gigabit Ethernet SFP transceiver for short-reach multimode fiber links. It provides 1Gbps optical connectivity, uses an 850nm wavelength, supports Digital Optical Monitoring, and connects through a dual LC/PC interface. It is commonly installed in Cisco switches, routers, and other platforms with compatible 1G SFP ports.
What does the GLC-SX-MMD model number mean?
GLC-SX-MMD identifies a Cisco Gigabit Ethernet SFP module for 1000BASE-SX multimode fiber. SX refers to short-wavelength multimode operation, MM indicates multimode fiber, and D identifies Digital Optical Monitoring support. The SKU separates this DOM version from related Cisco 1G SFP optics such as GLC-SX-MM-RGD and GLC-LH-SMD.
What type of hardware is GLC-SX-MMD?
GLC-SX-MMD is an optical SFP transceiver, not a switch, router, cable, or media converter. It plugs into a compatible SFP slot and converts an electrical Gigabit Ethernet interface into a 1000BASE-SX optical fiber connection. The module is hot-swappable, so supported Cisco platforms accept installation or replacement without shutting down the whole device.
Where does GLC-SX-MMD sit in the Cisco transceiver lineup?
GLC-SX-MMD sits in Cisco's 1-Gbps SFP optics lineup as the short-reach 1000BASE-SX multimode option with DOM. It is used where copper 1000BASE-T is unsuitable and long-reach single-mode optics are unnecessary. Adjacent Cisco options include GLC-T for copper, GLC-LH-SMD for LX/LH links, and GLC-EX-SMD for longer single-mode spans.
What form factor and data rate does GLC-SX-MMD use?
GLC-SX-MMD uses the Small Form-Factor Pluggable SFP form factor and supports Gigabit Ethernet 1000BASE-SX operation. The practical data rate is 1Gbps for Ethernet links on compatible Cisco SFP ports. It is not an SFP+ 10G module, so buyers should match it to 1G SFP interfaces or Cisco ports that explicitly support 1G SFP operation.
What wavelength does GLC-SX-MMD operate on?
GLC-SX-MMD operates as a 1000BASE-SX short-wavelength optical module using an 850nm nominal wavelength over multimode fiber. Cisco lists the 1000BASE-SX transmit and receive wavelength range as 770 to 860nm. This optical profile makes the module suitable for short building, riser, and equipment-room fiber runs using compatible MMF cabling.
What distance does GLC-SX-MMD support?
GLC-SX-MMD supports up to 550m over 50-micron multimode fiber at the common OM2 rating, with shorter supported distances on some 62.5-micron fiber types. Cisco also lists up to 1km over laser-optimized 50-micron multimode cable. Buyers should confirm the installed fiber grade, modal bandwidth, patching, and loss budget before selecting this 1000BASE-SX optic.
What connector does GLC-SX-MMD use?
GLC-SX-MMD uses a dual LC/PC connector for 1000BASE-SX multimode fiber links. Cisco notes that PC or UPC patch cords are supported, while APC patch cords are not supported for these SFP connections. The module requires a duplex multimode fiber pair, so it is not the correct choice for single-strand bidirectional fiber designs.
Does GLC-SX-MMD support Digital Optical Monitoring?
GLC-SX-MMD supports Digital Optical Monitoring, commonly called DOM. On compatible Cisco platforms, DOM helps operations teams read optical parameters such as transmit power, receive power, temperature, laser bias current, and supply voltage. This is useful for checking link health, identifying dirty fiber paths, and documenting optical performance during installation or troubleshooting.
Which Cisco platforms commonly support GLC-SX-MMD?
Cisco lists broad 1-Gbps SFP support across Catalyst, Nexus, ASR, ISR, ASA, MDS, ME, and other Cisco families. Examples include Catalyst 2960-X, 3560-X, 3750-X, 3850, 4500, 6800, Nexus 3000, Nexus 5000, Nexus 7000, and Nexus 9000 platforms. Final compatibility should be checked against the Cisco transceiver compatibility matrix for the exact hardware and software release.
What is GLC-SX-MMD used for?
GLC-SX-MMD is used for short-reach Gigabit Ethernet fiber uplinks between Cisco switches, routers, firewalls, and aggregation devices. It is a practical fit for access-to-distribution links, wiring-closet uplinks, and equipment-room fiber connections where existing multimode fiber is already installed. Its 1000BASE-SX profile keeps the link optical instead of extending copper Ethernet across longer internal runs.
What environment size is GLC-SX-MMD best suited for?
GLC-SX-MMD fits small, midsize, and enterprise networks that still run 1Gbps multimode fiber inside a building or campus. It is most relevant where the distance requirement is within 1000BASE-SX limits and a full 10G refresh is not required. It helps extend the working life of existing multimode fiber and compatible Cisco 1G SFP infrastructure.
What workloads or traffic patterns suit GLC-SX-MMD?
GLC-SX-MMD suits standard 1Gbps uplink traffic such as user VLAN aggregation, management networks, access switch uplinks, IP camera backhaul, wireless controller connections, and server-room cross-connects. It is not designed for 10Gbps server access or long-haul WAN transport. The module works best where predictable Gigabit Ethernet throughput over multimode fiber is the design requirement.
Can GLC-SX-MMD be used for access-to-distribution uplinks?
GLC-SX-MMD is a common choice for access-to-distribution uplinks when both ends use compatible 1000BASE-SX SFP ports. Network teams normally install matching SX optics at each end, connect duplex LC multimode fiber, and configure the switch ports for the required trunk, routed link, or EtherChannel design. The result is a stable 1G optical handoff inside the network.
Is GLC-SX-MMD compatible with Cisco Catalyst switches?
GLC-SX-MMD is associated with Cisco 1-Gbps SFP platform support across many Catalyst switch families, including Catalyst 2960, 2960-X, 3560-X, 3750-X, 3850, 4500, and 6800 series. Compatibility depends on the exact switch model, IOS or NX-OS support, and transceiver matrix entry. Buyers should confirm the specific platform before ordering for a production network.
Which standards does GLC-SX-MMD integrate with?
GLC-SX-MMD integrates with Gigabit Ethernet networks using the IEEE 802.3z 1000BASE-SX standard. Its DOM functionality aligns with the SFF-8472 monitoring approach used for optical diagnostics. The module works with multimode fiber cabling and dual LC/PC patching, making it suitable for standards-based SX links between compatible Cisco SFP interfaces.
How does GLC-SX-MMD integrate with network monitoring?
GLC-SX-MMD integrates with network monitoring through DOM readings exposed by compatible Cisco platforms. Operations teams can view optical transmit power, receive power, temperature, laser bias, and voltage through supported device commands or monitoring systems that collect interface data. This helps identify marginal fiber links before they become intermittent service issues.
What fiber infrastructure is required for GLC-SX-MMD?
GLC-SX-MMD requires multimode fiber with duplex LC patching and a link budget suitable for 1000BASE-SX operation. Common deployments use 50-micron OM2, OM3, OM4, or OM5 fiber, while some 62.5-micron fiber supports shorter distances. It is not intended for single-mode fiber links, single-fiber BiDi designs, or copper RJ-45 handoffs.
How does GLC-SX-MMD compare with GLC-SX-MM-RGD?
GLC-SX-MMD and GLC-SX-MM-RGD are both Cisco 1000BASE-SX multimode SFP options, but their positioning is different. GLC-SX-MMD is the standard short-wavelength SX module with DOM, while GLC-SX-MM-RGD is the rugged variant for harsher operating conditions. Buyers choosing between them should match the optic to the device environment, temperature requirement, and platform support.
How does GLC-SX-MMD compare with GLC-LH-SMD?
GLC-SX-MMD is the 850nm 1000BASE-SX multimode option for short fiber links, while GLC-LH-SMD is the 1310nm 1000BASE-LX/LH option used for longer single-mode links and supported multimode deployments. GLC-SX-MMD is usually selected for in-building MMF uplinks, while GLC-LH-SMD fits standard 10km SMF designs or LX/LH requirements.
How does GLC-SX-MMD compare with GLC-T?
GLC-SX-MMD provides 1Gbps optical Ethernet over multimode fiber, while GLC-T provides 1000BASE-T Ethernet over copper twisted-pair cabling. GLC-SX-MMD uses a dual LC optical connector and supports SX fiber reach, while GLC-T uses RJ-45 and is limited to standard copper Ethernet distances. The correct choice depends on the installed cabling path.
How does GLC-SX-MMD compare with GLC-EX-SMD or GLC-ZX-SMD?
GLC-SX-MMD is for short-reach 1000BASE-SX multimode links, while GLC-EX-SMD and GLC-ZX-SMD target longer single-mode fiber spans. GLC-EX-SMD supports 40km-class links, and GLC-ZX-SMD supports extended-distance designs dependent on link loss. GLC-SX-MMD is the better fit when the installed route is multimode fiber within SX distance limits.
Is GLC-SX-MMD available new or refurbished?
GLC-SX-MMD is commonly sourced in both new and refurbished condition through enterprise hardware resellers such as ORM Systems. Availability depends on current channel stock, tested refurbished inventory, and requested quantity. Buyers should specify condition preference, required lead time, and whether the deployment requires original Cisco optics, compatible alternatives, or mixed spare inventory.
What affects the GLC-SX-MMD price?
GLC-SX-MMD price is affected by condition, quantity, Cisco original versus compatible sourcing, warranty term, market availability, and urgency. Refurbished Cisco units are often priced differently from sealed new stock. Bulk requirements can also change unit pricing because optics are frequently purchased in pairs, spares, or larger refresh batches across multiple access switches.
Is GLC-SX-MMD still in production or end-of-life?
GLC-SX-MMD belongs to Cisco's long-running 1G SFP optics portfolio, and production or end-of-sale status should be checked against Cisco lifecycle notices before procurement. Many networks continue to use this SKU because 1000BASE-SX MMF links remain common. ORM Systems can help buyers source new, refurbished, or equivalent options when channel availability changes.
What lead time should buyers expect for GLC-SX-MMD?
GLC-SX-MMD lead time depends on stock position, required condition, order size, and destination. Small quantities of common 1G SX optics are often easier to source than rare platform modules, but larger projects need confirmation before purchase. ORM Systems provides lead-time guidance after checking available inventory and any testing or dispatch requirements.
Are bulk discounts available for GLC-SX-MMD?
Bulk discounts may be available for GLC-SX-MMD when buyers order multiple optics for switch refreshes, spare pools, or access-layer standardization. Quantity, condition, warranty requirement, and delivery schedule influence pricing. Since 1G SX transceivers are often deployed in matched pairs, buyers should include both active link needs and spare requirements when requesting volume pricing.
What warranty is available for GLC-SX-MMD from ORM Systems?
ORM Systems offers warranty coverage options for GLC-SX-MMD based on condition, sourcing route, and order terms. Cisco original optics and tested refurbished units may have different warranty handling, so buyers should confirm the applicable period before purchase. Warranty coverage is especially useful for spare optics, staged deployments, and multisite refreshes using repeated 1000BASE-SX links.
How are refurbished GLC-SX-MMD modules tested before dispatch?
Refurbished GLC-SX-MMD modules should be tested for physical condition, connector integrity, platform recognition, link establishment, and optical diagnostic readings where supported. Practical checks include DOM values, transmit and receive behavior, and stable 1Gbps operation over compatible multimode fiber. Testing helps reduce the risk of failed uplinks during access switch maintenance or replacement work.
What certifications or compliance standards apply to GLC-SX-MMD?
GLC-SX-MMD operates within the Cisco 1000BASE-SX SFP family, which is associated with IEEE 802.3z Gigabit Ethernet operation and Class 1 laser safety compliance in Cisco documentation. Cisco also lists SFP cabling and standards requirements for supported patch cords and fiber types. Buyers should retain Cisco datasheet references for internal compliance or procurement records.
How is GLC-SX-MMD configured for first use?
GLC-SX-MMD normally requires configuration on the host Cisco interface rather than on the transceiver itself. Engineers insert the SFP into a compatible port, connect duplex LC multimode fiber, confirm the peer optic is also 1000BASE-SX, and configure the switch or router interface for the required access, trunk, routed, or monitoring role.
Does GLC-SX-MMD require a license or special software?
GLC-SX-MMD does not carry its own software license. Operation depends on the Cisco host platform, supported operating system release, transceiver compatibility, and interface configuration. Some platforms enforce optic support lists or show warnings for unsupported modules, so buyers should verify the exact Cisco hardware, IOS, IOS XE, or NX-OS version before deployment.
What accessories or prerequisites are needed for GLC-SX-MMD?
GLC-SX-MMD requires a compatible Cisco SFP port, a matching 1000BASE-SX optic at the far end, and duplex LC multimode fiber patch cords using PC or UPC connectors. The installed fiber grade should support the intended distance. Cleaning tools, inspection scopes, and spare LC patch leads are useful prerequisites for reliable optical installation.
Where can GLC-SX-MMD be bought in the UK?
GLC-SX-MMD can be bought in the UK through ORM Systems for Cisco 1G multimode SFP requirements. Buyers can request pricing for new or refurbished condition, confirm Cisco original sourcing, and discuss quantities for access switch uplinks or spare stock. Providing the SKU, required condition, quantity, and delivery location helps speed up quotation and availability checks.
Does ORM Systems ship GLC-SX-MMD internationally?
ORM Systems can support international enquiries for GLC-SX-MMD depending on destination, stock, order size, and export requirements. Buyers outside the UK should provide the delivery country, quantity, condition preference, and any deadline when requesting a quote. International shipping planning is useful when optics are needed for multisite Cisco network maintenance or staged refresh projects.