GLC-LH-SMD – 1000BASE-LX/LH SFP – 10km SMF / 550m MMF – DOM
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GLC-LH-SMD Description
GLC-LH-SMD is a Cisco 1000BASE-LX/LH SFP transceiver for 1-Gbps fiber links that need Dual LC/PC optics and Digital Optical Monitoring.
Procurement teams usually separate GLC-LH-SMD from GLC-SX-MMD and GLC-EX-SMD by fiber plant and reach. GLC-LH-SMD uses 1310 nm LX/LH optics for up to 10 km over G.652 single-mode fiber or 550 m over multimode fiber with the required mode-conditioning patch cord, while GLC-SX-MMD is short-wavelength multimode and GLC-EX-SMD is the 40 km single-mode option.
Order review should verify Cisco host support through the Cisco compatibility source, LC/PC or UPC patch cords, no APC patching, DOM expectation, minimum cable distance, and whether a multimode deployment needs a mode-conditioning patch cord.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
GLC-LH-SMD |
|
Brand |
Cisco |
|
Product family |
Cisco SFP modules for Gigabit Ethernet applications |
|
Product type |
1000BASE-LX/LH SFP transceiver |
|
Ethernet rate |
1 Gigabit Ethernet |
|
Interface standard |
IEEE 802.3z 1000BASE-LX |
|
Fiber type |
Single-mode fiber and multimode fiber |
|
Wavelength |
1310 nm |
|
Operating distance |
Up to 10,000 m over G.652 SMF or 550 m over MMF |
|
Connector |
Dual LC/PC |
|
DOM support |
Yes |
|
Temperature range |
Extended temperature range -5 to 85 C |
|
Ordering description |
1000BASE-LX/LH long-wavelength with DOM |
Application Scenarios
GLC-LH-SMD fits Cisco 1-Gbps SFP ports where the fiber design calls for LX/LH reach over G.652 single-mode fiber instead of a short-range multimode optic.
For sites with both SMF and older multimode cabling, the same SKU can stay in the BOM while the quote review separates SMF patching from MMF mode-conditioning patch-cord requirements.
Networks that standardize on DOM-visible GLC optics can keep GLC-LH-SMD as the 1310 nm LX/LH spare while reserving GLC-SX-MMD and GLC-EX-SMD for their separate distance profiles.
Product Comparison
|
Parameter |
GLC-LH-SMD | ||
|---|---|---|---|
|
Product family |
Cisco SFP modules for Gigabit Ethernet applications |
Cisco SFP modules for Gigabit Ethernet applications |
Cisco SFP modules for Gigabit Ethernet applications |
|
Product type |
1000BASE-LX/LH SFP transceiver |
1000BASE-SX SFP transceiver |
1000BASE-EX SFP transceiver |
|
Ethernet rate |
1 Gigabit Ethernet |
1 Gigabit Ethernet |
1 Gigabit Ethernet |
|
Fiber type |
Single-mode fiber and multimode fiber |
Multimode fiber |
Standard single-mode fiber |
|
Wavelength |
1310 nm |
850 nm |
1310 nm |
|
Operating distance |
10,000 m over G.652 SMF or 550 m over MMF |
220 m to 1000 m depending on MMF type |
40,000 m over G.652 SMF |
|
Connector |
Dual LC/PC |
Dual LC/PC |
Dual LC/PC |
|
DOM support |
Yes |
Yes |
Yes |
|
Temperature range |
Extended temperature range |
Extended temperature range |
Extended temperature range |
|
Maximum channel insertion loss |
2.4 dB on any MMF or 6 dB on G.652 SMF |
2.4 dB to 5 dB depending on MMF type |
18 dB over G.652 SMF |
|
Ordering description |
1000BASE-LX/LH long-wavelength with DOM |
1000BASE-SX short wavelength with DOM |
1000BASE-EX long-wavelength with DOM |
- In a GLC-LH-SMD vs GLC-SX-MMD comparison, the main difference is fiber reach: GLC-LH-SMD covers 10 km SMF or 550 m MMF, while GLC-SX-MMD is the 850 nm multimode SX option.
- The GLC-LH-SMD vs GLC-EX-SMD difference is the SMF distance class. GLC-LH-SMD is the LX/LH 10 km choice, while GLC-EX-SMD extends the same 1-Gbps SFP family to 40 km over G.652 SMF.
- For a GLC-LH-SMD comparison, which model to choose should start with required fiber type, distance, channel insertion loss, DOM visibility, and Cisco host support.
Selection Guide
1. Match the 10 km SMF requirement
Choose GLC-LH-SMD when the BOM specifies Cisco 1000BASE-LX/LH optics for a 1-Gbps link over G.652 single-mode fiber up to 10,000 m.
2. Keep MMF orders tied to mode conditioning
For multimode fiber, keep the quote tied to the 550 m LX/LH distance and include the mode-conditioning patch-cord check required by Cisco.
3. Split SX and EX needs into separate lines
Select GLC-SX-MMD for short-wavelength multimode SX links, and select GLC-EX-SMD only when the design needs 40 km EX reach over G.652 SMF.
4. Validate the host before price approval
Confirm the Cisco platform, compatible operating system, supported slot, connector type, DOM expectation, and minimum cable distance before releasing the purchase line.
Ordering Checklist
|
Check Item |
What to Confirm |
Procurement Risk Controlled |
|---|---|---|
|
Exact product ID |
GLC-LH-SMD on the quote and receiving label |
Avoids substitution with SX, EX, ZX, copper, or rugged GLC optics |
|
Fiber plant |
G.652 SMF for 10,000 m reach or supported MMF for 550 m reach |
Keeps the ordered optic aligned with the installed cable path |
|
MMF patching |
Mode-conditioning patch cord for multimode LX/LH links |
Prevents treating LX/LH over MMF like a standard SX patch |
|
Connector plan |
Dual LC/PC or UPC patch cords and no APC patch cords |
Matches the Cisco connector rule for this SFP family |
|
DOM requirement |
DOM support is needed and visible on the target host |
Aligns monitoring expectations with the exact SFP model |
|
Host compatibility |
Cisco platform and compatible operating system for the target slot |
Keeps the order tied to Cisco support data rather than only optical reach |
Specifications
Packaging weight and dimensions included:| Weight | 0.25 kg |
|---|---|
| Dimensions | 16 × 12 × 4 cm |
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Brand | Cisco | Product ID | GLC-LH-SMD |
| Product family | Cisco SFP modules for Gigabit Ethernet applications | Product type | 1000BASE-LX/LH SFP transceiver |
| Ordering description | 1000BASE-LX/LH long-wavelength with DOM | Ethernet rate | 1 Gigabit Ethernet |
| Interface standard | IEEE 802.3z 1000BASE-LX | Fiber type | Single-mode fiber and multimode fiber |
| SMF reference | ITU-T G.652 SMF | Wavelength | 1310 nm |
| Transmit and receive wavelength range | 1270 to 1355 nm | SMF operating distance | 10,000 m over G.652 SMF |
| MMF operating distance | 550 m | Maximum channel insertion loss | 2.4 dB on any MMF; 6 dB on G.652 SMF |
| Transmit power range | -3 to -9.5 dBm | Receive power range | -3 to -20 dBm |
| Connector | Dual LC/PC | Patch-cord rule | PC or UPC connectors supported; APC connectors not supported |
| MMF patch-cord note | Mode-conditioning patch cord required on MMF | DOM support | Yes |
| Temperature rating | EXT | Operating temperature range | -5 to 85 C |
| Storage temperature range | -40 to 85 C | Minimum cable distance | 2 m |
| Typical SFP power consumption | Up to 1 W per SFP port | Module dimensions | 8.5 x 13.4 x 56.5 mm |
| Module weight | 75 g or less | Laser safety | Class I |
Get More Information
Need pricing, stock, or shipping details for the GLC-LH-SMD ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email sales@layer23-switch.com for a fast quotation.
Quality Certifications
Customer Reviews
Questions & Answers
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What is GLC-LH-SMD used for?
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Is GLC-LH-SMD single-mode or multimode?
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Does GLC-LH-SMD need a mode conditioning patch cable?
-
What dual LC connector does GLC-LH-SMD use?
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Does GLC-LH-SMD have DOM?
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When does GLC-LH-SMD fit better than GLC-SX-MMD?
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Can GLC-LH-SMD connect to a 10G SFP+ optic?
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What 1310 nm and EXT temperature details matter for GLC-LH-SMD?
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