GLC-EX-SMD – 1000BASE-EX SFP – 40km SMF – DOM
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GLC-EX-SMD Description
GLC-EX-SMD is a Cisco 1000BASE-EX SFP transceiver for 1G Gigabit Ethernet optical links over standard G.652 single-mode fiber. It fits Cisco SFP host ports where the BOM calls for a long-reach 1310 nm EX optic, dual LC/PC connectivity, DOM monitoring, and an extended-temperature module for spans up to 40 km.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
GLC-EX-SMD |
|
Product type |
1000BASE-EX SFP transceiver |
|
Ethernet rate |
1 Gigabit Ethernet |
|
Fiber type |
Standard single-mode fiber |
|
Wavelength |
1310 nm |
|
Operating distance |
40,000 m over G.652 SMF |
|
Connector |
Dual LC/PC |
|
DOM support |
Yes |
|
Temperature range |
Extended temperature range -5 to 85 C |
|
Maximum channel insertion loss |
18 dB over G.652 SMF |
|
Ordering description |
1000BASE-EX long-wavelength with DOM |
Application Scenarios
Use GLC-EX-SMD when a Cisco 1-Gbps SFP port needs a documented 1000BASE-EX single-mode fiber reach instead of a shorter LX/LH optical span.
The DOM-supported EX module is useful when operations teams need optical monitoring data from the transceiver while keeping the link in the Cisco 1-Gbps SFP family.
Keep GLC-EX-SMD separate from GLC-LH-SMD and GLC-ZX-SMD spares because the three part numbers differ by optical reach, wavelength plan, and attenuation checks.
Product Comparison
|
Parameter |
GLC-EX-SMD | ||
|---|---|---|---|
|
Product type |
1000BASE-EX SFP transceiver |
1000BASE-LX/LH SFP transceiver |
1000BASE-ZX SFP transceiver |
|
Ethernet rate |
1 Gigabit Ethernet |
1 Gigabit Ethernet |
1 Gigabit Ethernet |
|
Fiber type |
Standard single-mode fiber |
Single-mode fiber and multimode fiber support |
Single-mode fiber |
|
Wavelength |
1310 nm |
1310 nm |
1550 nm |
|
Operating distance |
40,000 m over G.652 SMF |
10,000 m over G.652 SMF and up to 550 m on multimode fiber |
Approximately 70 km depending on link loss |
|
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 |
|
Attenuator planning |
5 dB inline attenuator for back-to-back connectivity |
Mode-conditioning patch cord required on legacy multimode fiber |
10 dB inline attenuator when single-mode span loss is less than 8 dB |
|
Ordering description |
1000BASE-EX long-wavelength with DOM |
1000BASE-LX/LH long-wavelength with DOM |
1000BASE-ZX extended distance with DOM |
- In a GLC-EX-SMD vs GLC-LH-SMD comparison, the main difference is SMF reach: GLC-EX-SMD is the 40 km EX option, while GLC-LH-SMD is the 10 km LX/LH SMF choice with multimode support.
- The GLC-EX-SMD vs GLC-ZX-SMD difference is the long-reach optical plan: GLC-EX-SMD uses 1310 nm EX reach at 40,000 m, while GLC-ZX-SMD uses 1550 nm ZX reach that Cisco describes as approximately 70 km depending on link loss.
- For a GLC-EX-SMD comparison, which model to choose should start with required distance, fiber type, attenuation planning, and Cisco host compatibility.
Selection Guide
1. Choose it for documented 40 km EX reach
Select GLC-EX-SMD when the BOM requires a Cisco 1000BASE-EX SFP for a G.652 single-mode fiber span up to 40,000 m.
2. Use GLC-LH-SMD for shorter LX/LH links
Choose GLC-LH-SMD instead when the link is a 10 km SMF run or a multimode LX/LH deployment with the required mode-conditioning patch-cord review.
3. Review GLC-ZX-SMD for longer ZX distance
Quote GLC-ZX-SMD only when the design calls for Cisco 1000BASE-ZX reach and the optical loss plan supports the longer 1550 nm link.
4. Validate the Cisco host and optical budget
Confirm the target platform, software support, LC/PC patching, fiber plant loss, and any required attenuator before adding GLC-EX-SMD to the purchase line.
Ordering Checklist
|
Check Item |
What to Confirm |
Procurement Risk Controlled |
|---|---|---|
|
Fiber plant |
Standard G.652 single-mode fiber for the 40,000 m EX span |
Keeps the optical reach tied to Cisco’s cabling table |
|
Connector plan |
Dual LC/PC patch cords and no APC patch cords |
Matches the Cisco connector rule for this SFP family |
|
DOM requirement |
DOM support is required and visible to the target host |
Aligns monitoring expectations with the exact SFP model |
|
Attenuation check |
5 dB inline attenuator for back-to-back EX links where needed |
Avoids receiver overload during short-distance testing or lab staging |
|
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
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | GLC-EX-SMD | Product type | 1000BASE-EX SFP transceiver |
| Ordering description | 1000BASE-EX long-wavelength with DOM | Ethernet rate | 1 Gigabit Ethernet |
| Fiber type | Standard single-mode fiber | SMF reference | ITU-T G.652 SMF |
| Wavelength | 1310 nm | Transmit and receive wavelength range | 1290 to 1335 nm |
| Operating distance | 40,000 m over G.652 SMF | Maximum channel insertion loss | 18 dB over G.652 SMF |
| Transmit power range | +3 to -1 dBm | Receive power range | +1 to -22 dBm |
| Connector | Dual LC/PC | Patch-cord rule | PC or UPC connectors supported |
| 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 | Back-to-back attenuation | 5 dB inline attenuator at each end |
Get More Information
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Customer Reviews
Questions & Answers
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What is GLC-EX-SMD used for?
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How far can GLC-EX-SMD run?
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Can GLC-EX-SMD connect to GLC-ZX-SMD?
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Which fiber connector does GLC-EX-SMD use?
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Why does GLC-EX-SMD need optical power review?
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Does GLC-EX-SMD provide DOM readings?
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Where is GLC-EX-SMD a poor replacement for LX?
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What platform check matters for GLC-EX-SMD?
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