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1000BASE-LX/LH SFP delivers dependable long-distance connectivity over SMF/MMF with DOM support.
GLC-LH-SMD
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GLC-LH-SMD (Cisco 1000BASE-LX/LH SFP Transceiver Module, 1310nm/10km/MMF-SMF/LC/DOM)
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GLC-LH-SMD Overview
GLC-LH-SMD uses the Small Form-Factor Pluggable hardware format for Cisco network devices with modular Gigabit Ethernet slots and uplink bays. The module carries 1 Gbps electrical interface traffic through a supported Gigabit Ethernet host port connection during normal operation. Its optical path works with single-mode fiber and multimode fiber for the same LX/LH optic interface. The front interface uses a dual LC/PC connector pair for separated transmit and receive strands at the port face. The optical channel operates at a nominal 1310 nm wavelength across transmit and receive optical paths. The single-mode link budget reaches 10 km on G.652 fiber under the Cisco cabling specification for this optic. The operating temperature class is Extended for supported operating environments and approved Cisco platform deployments. Digital Optical Monitoring support provides DDM/DOM telemetry through the transceiver serial diagnostic interface for live module readings.
With FP transmitter technology, GLC-LH-SMD uses a Fabry-Perot optical source for LX/LH signaling over the transmit lane. PIN receiver type converts incoming optical energy through a photodiode receive path and electrical limiting circuitry inside the module. TX power range delivers -9.5 dBm to -3 dBm at the optical transmit interface under normal module operation. RX sensitivity reaches -20 dBm at the receiver input for the specified receive power floor in operation. Receiver overload point accepts -3 dBm as the maximum receive power boundary before optical input saturation. With 8b/10b encoding, the 1000BASE-X physical layer maps payload bits into balanced ten-bit transmission characters for serial transmission. IEEE 802.3z, IEEE 802.3ah, and SFF-8472 MSA govern Ethernet operation, optical compliance, diagnostic behavior, and monitoring interoperability. With 3.3V supply voltage, the module uses the standard SFP host power rail for transceiver electronics. At 1 W maximum power consumption, the module stays within the Cisco SFP port power profile during service.
Cisco Catalyst 2960, Catalyst 3560, Catalyst 3650, Catalyst 3750, Catalyst 4500, and Catalyst ESS9300 families accept this module. ASR 901, Integrated Services Router 11XX, ME 3600X, Nexus 30XX, Nexus 7000, and UCS 62XX platforms accept it. Enterprise campus wiring closets, aggregation layers, access switch uplinks, router handoffs, and lifecycle refresh projects deploy this Cisco optic. OS2 grade cabling serves structured plant builds that require standardized long-haul channel budgets and documented loss. GLC-LH-SMD is available from ORM Systems in new and certified refurbished condition for procurement teams. ORM Systems tests certified refurbished stock for physical condition, optical telemetry, transmit output, receive operation, and clean inventory serialization. Shop GLC-LH-SMD online from ORM Systems to check price, confirm stock, and place an order with account support. Request a bulk quotation from ORM Systems for enterprise and volume buyers with project pricing and procurement support.
GLC-LH-SMD price is $97.00, a 91.7% saving from the Cisco list price of $1,174.00. GLC-LH-SMD is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for GLC-LH-SMD for additional pricing. Browse the full Sfp series or explore all Cisco products.
GLC-LH-SMD Specifications
- Product Type
- Optical Transceiver
- Brand
- Cisco
- Series
- Cisco SFP Modules
- Compatible OEM Part
- N/A
- Use Case
- Enterprise Campus
- Form Factor
- SFP
- Data Rate
- 1 Gbps
- Protocol
- Ethernet
- Fiber Type
- Single-Mode (SMF) / Multi-Mode (MMF)
- Connector Type
- LC Duplex
- Wavelength TX
- 1310 nm
- Wavelength RX
- 1310 nm
- Reach
- 10 km (OS2)
- Cable Standard
- OS2
- Transmitter Type
- FP
- Receiver Type
- PIN
- TX Power Min
- -9.5 dBm
- TX Power Max
- -3 dBm
- RX Sensitivity
- -20 dBm
- RX Power Max
- -3 dBm
- Encoding
- 8b/10b
- Supported Standards
- IEEE 802.3z / IEEE 802.3ah / SFF-8472
- DDM/DOM Support
- Yes
- Power Consumption
- 1 W
- Supply Voltage
- 3.3V
- Operating Temperature
- Extended (-5°C to 85°C)
- Compatible Platforms
- Cisco Catalyst 2960 / Catalyst 3560 / Catalyst 3650 / Catalyst 3750 / Catalyst 4500 / Catalyst ESS9300 / Cisco ASR 901 / Integrated Services Router 11XX / Cisco ME 3600X / Cisco Nexus 30XX / Cisco Nexus 7000 / Cisco UCS 62XX
- Certifications
- CE / RoHS
- Height
- 8.5 mm
- Width
- 13.4 mm
- Depth
- 56.5 mm
- Weight
- 0.075 kg
GLC-LH-SMD Use Case
Access to Distribution Mixed-Fiber Uplink
The GLC-LH-SMD operates as a Gigabit Ethernet uplink from an access switch to distribution over either single-mode or multimode fiber plant. The 1000BASE-LX/LH interface transmits at 1310 nm through dual LC connectors, supporting 10 km spans on G.652 single-mode fiber and 550 m spans on multimode fiber with the required mode-conditioning patch cord. Engineers configure the port as a routed access link or VLAN trunk according to the campus design. The access layer gains a documented fiber handoff across mixed cabling without changing the switch platform.
Distribution to Core Single-Mode Link
GLC-LH-SMD fits a distribution-to-core Gigabit link where the fiber path runs through standard single-mode cabling between network rooms. The SFP presents a 1000BASE-LX/LH interface at 1310 nm, and the routed adjacency carries summarized access prefixes, default route propagation, or first-hop gateway traffic toward the core. DOM data exposes optical receive levels and transceiver temperature during turn-up, troubleshooting, and scheduled fiber maintenance on the Cisco host platform. The distribution layer gains a monitored 1 Gigabit uplink over a 10 km SMF design envelope.
Management Plane Fiber Reach
In an out-of-band management topology, the GLC-LH-SMD links a device SFP port to a management aggregation switch across existing fiber. The LX/LH optic carries the management VLAN over duplex LC cabling, using SMF for longer building-to-building runs or MMF with mode conditioning inside older fiber areas. Operations teams validate DOM readings before adding TACACS, SNMP, syslog, and device-backup flows to the management VRF. The management plane gains a separated fiber path that remains independent of production access switching and copper endpoint patching.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| GLC-LH-SMD |  GLC-FE-100LX-RGD |  GLC-FE-100FX48 | |
|---|---|---|---|
| Product Type | Optical Transceiver | Transceiver | Transceiver |
| Form Factor | SFP | SFP | SFP |
| Data Rate | 1 Gbps | 1G | 100 Mbps |
| Connector Type | LC Duplex | LC | LC Duplex |
| Wavelength | 1310 nm | 1300 nm | |
| Transmission Distance | Long-Range | Short-Range | |
| Fiber Type | Single-Mode (SMF) / Multi-Mode (MMF) | Single-mode | Multi-mode |
| Max Distance | 10 km | 2000 m | |
| Supported Protocols | Ethernet | Ethernet | |
| Network Interface | Fiber | Fiber | |
| Power Consumption | 1 W | N/A | N/A |
| Operating Temperature | Extended (-5°C to 85°C) | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | |
| Input Voltage | 3.3V | 3.3V | |
| Compatibility | Cisco | Cisco | |
| Product Name | GLC-FE-100LX-RGD= | GLC-FE-100FX48 | |
| Height | 8.5 mm | N/A | N/A |
| Width | 13.4 mm | N/A | N/A |
| Depth | 56.5 mm | N/A | N/A |
| Weight | 0.075 kg | N/A | N/A |
Reviews & Ratings
F
Finn Carver
5
Professional-grade, easy deployment, stable throughput.
G
Giselle Park
5
Reliable module for enterprise backbone fiber links.
H
Harrison Drake
5
Durable and low-maintenance, ensures consistent signal quality.
I
Isla Reed
5
Ideal for long-distance network applications with high stability.
Questions & Answers
What is the Cisco GLC-LH-SMD?
The Cisco GLC-LH-SMD is a 1 Gigabit SFP transceiver module supporting 1000BASE-LX/LH operation at 1310nm. It reaches up to 10 kilometres over single-mode fibre, or up to 550 metres over multimode fibre when used with a mode conditioning patch cable. The GLC-LH-SMD includes Digital Optical Monitoring and is the standard long-reach 1G SFP module across Cisco's enterprise and SMB switch and router platforms worldwide.
What does GLC-LH-SMD stand for?
GLC stands for Gigabit LAN Card, LH refers to Long Haul, the extended-reach variant of the 1000BASE-LX specification, SM indicates Single-Mode fibre as the primary medium, and D denotes Digital Optical Monitoring. The D suffix distinguishes the GLC-LH-SMD from its predecessor the GLC-LH-SM, which lacked DOM capability. This naming convention is consistent across Cisco's 1G SFP optics family to indicate DOM support at a glance.
What does 1000BASE-LX/LH mean for the GLC-LH-SMD?
1000BASE-LX is the IEEE 802.3z standard for Gigabit Ethernet over long-wavelength (1310nm) fibre. The LH designation extends the single-mode reach to 10km using tighter transmit power and receiver sensitivity specifications. The GLC-LH-SMD supports both LX and LH, achieving the full 10km reach on OS1 or OS2 single-mode fibre and up to 550m on multimode fibre when a mode conditioning patch cable is used at one end of the link.
Where does the GLC-LH-SMD sit in Cisco's 1G SFP range?
The GLC-LH-SMD is the long-reach single-mode member of Cisco's 1G SFP family. Below it in reach is the GLC-SX-MMD at 850nm and 550m over multimode fibre. Above it are the GLC-EX-SMD at 40km and GLC-ZX-SMD at 70km, both for single-mode fibre. For enterprise campus deployments requiring connections beyond 550 metres and up to 10 kilometres, the GLC-LH-SMD is the standard 1G long-reach choice.
What data rate does the GLC-LH-SMD support?
The GLC-LH-SMD operates at 1.25 Gbps line rate, delivering 1000 Mbps full-duplex Gigabit Ethernet throughput conforming to IEEE 802.3z 1000BASE-LX and 1000BASE-LH. It operates at 1G only and does not step down to 100 Mbps optically. The GLC-LH-SMD is not suitable for 10G links and should not be used in SFP+-only slots, as it is a standard SFP module operating at the 1G speed tier.
What is the maximum reach of the GLC-LH-SMD on single-mode fibre?
The GLC-LH-SMD reaches up to 10 kilometres over OS1 or OS2 single-mode fibre under the 1000BASE-LH specification. This makes it appropriate for inter-building campus connections, metropolitan area short-distance links, and any 1G fibre run where the distance falls between 550 metres and 10 kilometres. The 10km reach is achieved at standard transmit power without optical amplification on correctly installed OS2 single-mode cabling with clean LC connectors at both ends.
Can the GLC-LH-SMD be used on multimode fibre?
Yes, but a mode conditioning patch cable (MCP) is required. The GLC-LH-SMD can operate on OM1 or OM2 multimode fibre up to 550 metres, but only when an MCP is used at one end. Without the mode conditioning cable, the 1310nm laser launch into multimode fibre causes differential mode delay, which produces signal errors. On single-mode fibre, no MCP is needed and the full 10km reach is achievable without any additional accessories.
What wavelength does the GLC-LH-SMD use?
The GLC-LH-SMD transmits and receives at 1310nm, the standard wavelength for 1000BASE-LX and LH single-mode transceivers. The 1310nm window provides low chromatic dispersion in single-mode fibre and suits both OS1 and OS2 fibre grades used in enterprise and campus cabling. Both ends of the link must use 1310nm-compatible 1G modules, as mixing with 850nm modules such as the GLC-SX-MMD will result in wavelength mismatch and link failure.
What connector type does the GLC-LH-SMD use?
The GLC-LH-SMD uses an LC duplex connector with standard UPC polish, the same connector as other 1G and 10G SFP fibre modules. Patch cables must be LC-to-LC with the appropriate fibre type: OS2 single-mode for the standard 10km application, or OM1/OM2 multimode paired with a mode conditioning patch cable for the shorter 550m multimode scenario. LC connectors are widely available in enterprise fibre patch panels and distribution frames.
Does the GLC-LH-SMD support Digital Optical Monitoring?
Yes, the D in GLC-LH-SMD confirms DOM support. DOM reports real-time optical diagnostics including transmit power, receive power, laser bias current, module temperature, and supply voltage. These are accessible via the "show interfaces transceiver" command on compatible Cisco IOS versions. On long single-mode runs up to 10km, DOM is particularly useful for diagnosing marginal receive power levels caused by connector contamination or fibre bend losses without requiring physical inspection.
What is the GLC-LH-SMD used for?
The GLC-LH-SMD is used to provide 1 Gigabit Ethernet connectivity over single-mode fibre where link distances fall between 550 metres and 10 kilometres. Common deployments include campus inter-building backbone links, wiring closet connections that exceed multimode reach limits, and any 1G deployment where OS1 or OS2 single-mode fibre has been installed. It is the standard choice when existing fibre is single-mode or when future-proofing with a single-mode infrastructure for long-term distance scalability.
Is the GLC-LH-SMD suitable for campus inter-building connections?
Yes, the GLC-LH-SMD is a common choice for campus inter-building fibre links. Campus runs between buildings typically fall within the 100m to 2km range, well within the 10km reach on single-mode fibre. It is widely deployed on Cisco Catalyst distribution and core switches for backbone connections across multi-building campus environments where single-mode OS2 fibre has been installed as the backbone medium. Its 10km ceiling covers virtually all campus link distances encountered in practice.
Can the GLC-LH-SMD be used for short metropolitan area connections?
Yes, the 10km reach over single-mode fibre is sufficient for most intra-city campus and short metro fibre runs. For connections beyond 10km, the GLC-EX-SMD (40km) or GLC-ZX-SMD (70km) provide extended reach at the same 1G speed. For typical enterprise inter-site links within a city where fibre is leased or owned, the GLC-LH-SMD covers the majority of scenarios without requiring more expensive long-haul modules.
Is the GLC-LH-SMD appropriate for use in data centres?
The GLC-LH-SMD is used in data centres for 1G single-mode fibre connections on management interfaces, out-of-band links, or legacy device connectivity where single-mode fibre is installed and 1G throughput is sufficient. In modern data centre builds where 10G or higher is the standard, the SFP-10G-LR-S is typically deployed instead. The GLC-LH-SMD remains relevant for maintaining and extending older Cisco infrastructure within data centres that have not yet migrated to 10G.
What Cisco platforms support the GLC-LH-SMD?
The GLC-LH-SMD is compatible with Cisco Catalyst 2960, 2960X, 3560, 3750, 3850, 4500, 4500X, 6500, and 6800 series switches, Cisco ISR 2900, 3900, and 4000 series routers, Cisco ASA firewalls, and many other Cisco devices with SFP slots, including the Catalyst 1300 and CBS350 combo uplink ports. Verify against Cisco's official compatibility matrix for your specific platform and IOS version before purchasing.
Is the GLC-LH-SMD compatible with Catalyst 1300 combo uplink ports?
Yes, the GLC-LH-SMD works in the combo SFP/RJ-45 uplink ports on Cisco Catalyst 1300 and CBS350 series SMB switches. It is commonly used to provide single-mode fibre uplinks from access-layer SMB switches to upstream distribution switches where the wiring closet distance or building-to-building run exceeds what multimode fibre can support. When the GLC-LH-SMD is inserted, the copper side of the combo port deactivates automatically.
Can the GLC-LH-SMD be used with non-Cisco equipment?
The GLC-LH-SMD is encoded for Cisco platforms and will not function correctly in switches or routers from other vendors. Non-Cisco platforms require their own vendor-encoded long-haul 1G SFP modules. Using a Cisco-encoded GLC-LH-SMD in non-Cisco hardware typically results in the port not initialising or an unsupported module error. Third-party compatible long-reach 1G SFP modules programmed for the specific target platform are available for non-Cisco deployments.
What is the mode conditioning patch cable needed for multimode use of the GLC-LH-SMD?
A mode conditioning patch cable (MCP) is a specialised patch lead that offsets the 1310nm laser launch point from the centre of the multimode fibre core, preventing differential mode delay. It connects to the GLC-LH-SMD's LC port at one end and to the multimode fibre run at the other. One MCP is required at only one end of the link. Without it on a multimode link, the launch condition causes excessive bit errors. On single-mode fibre, no MCP is ever required.
What is the difference between the GLC-LH-SMD and GLC-SX-MMD?
The GLC-LH-SMD uses 1310nm for up to 10km over single-mode fibre, or 550m over multimode with a mode conditioning cable. The GLC-SX-MMD uses 850nm for up to 550m over multimode fibre with no MCP required. Use the GLC-SX-MMD for short intra-building runs over existing multimode cabling. Use the GLC-LH-SMD when single-mode fibre is installed, when distances exceed 550 metres, or when future distance scalability matters.
What is the difference between the GLC-LH-SMD and GLC-LH-SM?
The GLC-LH-SMD is the updated replacement for the GLC-LH-SM, adding DOM support as indicated by the D suffix. Both are optically identical: 1310nm, 1000BASE-LX/LH, 10km over single-mode fibre. The GLC-LH-SMD is the current recommended module and should be specified for all new orders. The GLC-LH-SM is the older non-DOM variant and is effectively replaced by the GLC-LH-SMD without any other functional change.
How does the GLC-LH-SMD compare to the GLC-EX-SMD?
The GLC-EX-SMD extends reach to 40 kilometres over single-mode fibre at 1310nm. Both use LC connectors and support DOM. The GLC-LH-SMD is the correct and more economical choice for distances up to 10km, covering all standard campus and short metro links. The GLC-EX-SMD is used when link distances genuinely exceed 10km, such as longer metropolitan links or connections between distant enterprise sites over leased single-mode fibre.
When should I choose the GLC-LH-SMD over the GLC-SX-MMD?
Choose the GLC-LH-SMD when your fibre infrastructure is single-mode, when link distance exceeds 550 metres, or when you are installing new fibre and prefer single-mode for long-term scalability. The GLC-SX-MMD is correct when existing OM1 or OM2 multimode cabling is already in place and distances are within its 550-metre limit. If your multimode runs are within range and refibre is not planned, the GLC-SX-MMD is the more economical choice.
Is the GLC-LH-SMD available new and refurbished?
Yes, the GLC-LH-SMD is available in both new and certified refurbished condition from ORM Systems. Refurbished units are tested before dispatch, with optical transmit and receive power verified within Cisco's specification and DOM functionality confirmed. Refurbished modules are a cost-effective option for campus deployments requiring genuine Cisco long-reach 1G optics at a lower unit cost than new stock, particularly for large quantities across many switch uplinks.
What is the price of the GLC-LH-SMD?
Pricing for the GLC-LH-SMD varies by condition and order quantity. ORM Systems offers competitive pricing on both new and refurbished units, with volume discounts available. For the current price, check the GLC-LH-SMD product page on ormsystems.com or contact the ORM Systems sales team for a quote, particularly for campus rollouts or multi-site deployments requiring larger quantities of long-reach 1G SFP modules.
Is the GLC-LH-SMD still in production?
The GLC-LH-SMD remains an active product in Cisco's portfolio and is stocked by ORM Systems in both new and refurbished condition. Single-mode 1G connectivity continues to be required across enterprise campus networks with OS2 fibre infrastructure, and demand for replacement and new deployment modules remains consistent. ORM Systems maintains inventory to support both ongoing maintenance of existing Cisco platforms and new builds specifying this module.
Can I order the GLC-LH-SMD in bulk from ORM Systems?
Yes, ORM Systems accepts bulk orders for the GLC-LH-SMD and provides volume pricing for larger quantities. Campus network builds with single-mode fibre uplinks across multiple switches regularly require identical modules in quantity. Use the bulk quotation form on the GLC-LH-SMD product page or contact the ORM Systems sales team with your quantity and delivery timeline for a tailored pricing proposal.
What are the lead times for the GLC-LH-SMD from ORM Systems?
Lead times depend on current stock availability and delivery region. ORM Systems ships from UK, USA, UAE, and Netherlands locations, supporting fast regional fulfilment. In-stock units are dispatched promptly. For volume orders or project-critical deadlines, confirm availability with the ORM Systems sales team before placing the order to ensure your required quantity and timeline can both be met.
What warranty does the GLC-LH-SMD come with from ORM Systems?
New Cisco GLC-LH-SMD modules carry the standard Cisco hardware warranty. Refurbished units sold by ORM Systems are covered by the ORM Systems warranty against hardware defects identified after delivery. For specific warranty duration and coverage terms, check the product listing on ormsystems.com or contact ORM Systems directly before purchasing, as terms can differ between new and refurbished stock conditions.
Is a refurbished GLC-LH-SMD tested before dispatch?
Yes, refurbished GLC-LH-SMD units at ORM Systems are tested before dispatch. Testing confirms optical transmit and receive power are within Cisco's specification, DOM data is accurate and accessible, and the module and LC connector are physically undamaged. This ensures correct operation on a supported Cisco platform without triggering optical power warnings or link instability after installation on a single-mode fibre link.
What certifications does the GLC-LH-SMD carry?
The Cisco GLC-LH-SMD meets FCC Class A and CE electromagnetic compatibility standards and is RoHS compliant. It conforms to IEEE 802.3z 1000BASE-LX and the 1000BASE-LH specification, as well as the SFP Multi-Source Agreement. These certifications make it suitable for deployment in regulated enterprise, public sector, and educational environments in the UK, EU, and US.
How do I install the GLC-LH-SMD in a Cisco switch?
Insert the GLC-LH-SMD into an available SFP slot with the label facing up until the module clicks into place. Remove the dust cap and connect the LC patch cable: OS2 single-mode for 10km use, or a mode conditioning patch cable followed by multimode fibre for legacy MMF infrastructure. The switch detects the module automatically. Confirm detection with "show interfaces" or "show inventory" and verify DOM readings with "show interfaces transceiver."
Does the GLC-LH-SMD require any special IOS configuration?
No special configuration is required. The GLC-LH-SMD is automatically detected by Cisco IOS and IOS-XE on insertion. Apply standard interface settings including "no shutdown" and any VLAN or IP assignments for your deployment. If deploying over multimode fibre with a mode conditioning patch cable, no additional IOS configuration is required for that scenario. DOM data is available without additional setup via "show interfaces transceiver" on compatible IOS versions.
Does the GLC-LH-SMD require a licence to operate?
No, the GLC-LH-SMD does not require a licence. It activates automatically when inserted into a compatible Cisco SFP port. Cisco licensing applies to software features such as routing protocol tiers and security functions, not to optical hardware modules. The GLC-LH-SMD is fully operational on any compatible Cisco platform immediately after insertion without any licence activation step.
Where can I buy the GLC-LH-SMD in the UK?
The GLC-LH-SMD is available from ORM Systems at ormsystems.com. ORM Systems is a UK-based B2B IT hardware reseller with UK fulfilment, providing genuine Cisco long-reach 1G SFP modules with fast domestic delivery. Both new and refurbished units are listed with competitive pricing, and bulk order options are available for campus deployments and network refresh projects requiring multiple single-mode fibre uplink modules.
Does ORM Systems ship the GLC-LH-SMD internationally?
Yes, ORM Systems ships the GLC-LH-SMD internationally from fulfilment locations in the UK, USA, UAE, and Netherlands. This supports customers across Europe, North America, the Middle East, and other regions with faster regional delivery. Contact the ORM Systems sales team for delivery timelines specific to your region and to confirm any import documentation requirements before placing an international order.