GLC-ZX-SMD – 1000BASE-ZX SFP – 70km SMF – EXT DOM
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GLC-ZX-SMD Description
GLC-ZX-SMD is a Cisco 1000BASE-ZX SFP optical transceiver for 1G Ethernet long-reach links over single-mode fiber. It uses a 1550 nm wavelength, dual LC/PC connectors, and DOM support, with Cisco listing operation over ITU-T G.652 SMF to approximately 70 km depending on link loss. The extended-temperature rating of -5 to 85 C and ZX optical budget details make it a BOM-matching optic for Cisco host platforms where compatibility and operating-system support are checked against Cisco transceiver documentation.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
GLC-ZX-SMD |
|
Product type |
1000BASE-ZX SFP transceiver |
|
Ethernet rate |
1 Gigabit Ethernet |
|
Fiber type |
Single-mode fiber |
|
SMF reference |
ITU-T G.652 SMF |
|
Wavelength |
1550 nm |
|
Operating distance |
Approximately 70 km depending on link loss |
|
Connector |
Dual LC/PC |
|
DOM support |
Yes |
|
Temperature range |
Extended temperature range -5 to 85 C |
|
Maximum channel insertion loss |
21 dB over single-mode fiber |
Application Scenarios
GLC-ZX-SMD fits Cisco SFP ports that need documented 1000BASE-ZX reach over single-mode fiber instead of a 10 km LX/LH or 40 km EX optical path.
The DOM-supported ZX module is useful when the receiving platform must expose optical monitoring data for a long 1-Gigabit fiber span.
Keep GLC-ZX-SMD separate from GLC-EX-SMD, GLC-LH-SMD, GLC-ZX-SM, and GLC-ZX-SM-RGD because those choices change reach, wavelength, temperature rating, or the exact ordering line.
Product Comparison
|
Parameter |
GLC-ZX-SMD |
GLC-ZX-SM-RGD | |
|---|---|---|---|
|
Product type |
1000BASE-ZX SFP transceiver |
1000BASE-EX SFP transceiver |
1000BASE-ZX rugged SFP transceiver |
|
Ethernet rate |
1 Gigabit Ethernet |
1 Gigabit Ethernet |
1 Gigabit Ethernet |
|
Fiber type |
Single-mode fiber |
Standard single-mode fiber |
Single-mode fiber |
|
Wavelength |
1550 nm |
1310 nm |
1550 nm |
|
Operating distance |
Approximately 70 km depending on link loss |
40,000 m over G.652 SMF |
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 |
Industrial temperature range |
|
Maximum channel insertion loss |
21 dB over single-mode fiber |
18 dB over G.652 SMF |
21 dB over single-mode fiber |
|
Link-loss review |
Minimum attenuation check for shorter ZX spans |
EX link budget and short-span attenuation check |
Minimum attenuation check for shorter ZX spans |
|
Ordering description |
1000BASE-ZX extended distance with DOM |
1000BASE-EX long-wavelength with DOM |
1000BASE-ZX extended distance rugged |
- In a GLC-ZX-SMD vs GLC-EX-SMD comparison, the main difference is optical reach and wavelength: GLC-ZX-SMD is the 1550 nm ZX option for about 70 km depending on link loss, while GLC-EX-SMD is the 1310 nm EX option for 40,000 m over G.652 SMF.
- The GLC-ZX-SMD vs GLC-ZX-SM-RGD difference is temperature positioning. GLC-ZX-SMD is the EXT DOM model, while GLC-ZX-SM-RGD is the industrial-temperature rugged ZX model.
- For a GLC-ZX-SMD comparison, which model to choose should start with required SMF distance, temperature rating, DOM requirement, Cisco host compatibility, and the link-loss result.
Selection Guide
1. Choose it for long 1G SMF reach
Select GLC-ZX-SMD when the BOM requires Cisco 1000BASE-ZX optics for a single-mode 1-Gigabit link where the Cisco reach note points to about 70 km depending on link loss.
2. Keep EX optics on 40 km designs
Use GLC-EX-SMD instead when the fiber design is a 1310 nm EX link up to 40,000 m over G.652 SMF.
3. Reserve rugged ZX for industrial temperature requirements
Move the order to GLC-ZX-SM-RGD only when the official BOM needs the industrial-temperature rugged ZX part rather than the extended-temperature DOM model.
4. Validate host support and optical loss
Confirm the Cisco platform, operating-system support, far-end optical type, LC/PC patching, DOM visibility, and minimum attenuation before approving the GLC-ZX-SMD line.
Ordering Checklist
|
Check Item |
What to Confirm |
Procurement Risk Controlled |
|---|---|---|
|
Cisco host support |
Platform, SFP slot, and operating-system support in Cisco compatibility documentation |
Keeps the optic tied to Cisco support data |
|
Fiber plant |
Single-mode fiber with enough link loss for a ZX optical budget |
Aligns the order with Cisco’s long-reach cabling table |
|
Far-end optic |
Matching 1000BASE-ZX 1550 nm optical type at the other end |
Avoids wavelength and reach mismatch |
|
Connector plan |
Dual LC/PC patch cords and clean LC connector end faces |
Reduces installation risk on long optical spans |
|
Attenuation review |
Minimum attenuation and possible inline attenuator for short ZX spans |
Helps avoid receiver overload during staging or short-distance deployment |
|
DOM requirement |
DOM support is needed and visible on the target Cisco host |
Aligns monitoring expectations with the exact SFP model |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | GLC-ZX-SMD | Product type | 1000BASE-ZX SFP transceiver |
| Ordering description | 1000BASE-ZX extended distance with DOM | Ethernet rate | 1 Gigabit Ethernet |
| Fiber type | Single-mode fiber | SMF reference | ITU-T G.652 SMF |
| Nominal wavelength | 1550 nm | Transmit and receive wavelength range | 1500 to 1580 nm |
| Operating distance | Approximately 70 km depending on link loss | Maximum channel insertion loss | 21 dB over single-mode fiber |
| Transmit power range | +5 to 0 dBm | Receive power range | -3 to -23 dBm |
| Connector | Dual LC/PC | DOM support | Yes |
| Temperature rating | EXT | Operating temperature range | -5 to 85 C |
| Storage temperature range | -40 to 85 C | 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 | Minimum ZX attenuation | 8 dB between TX and RX on shorter SMF spans |
| Standard Cisco warranty | 5 years |
Get More Information
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Quality Certifications
Customer Reviews
Questions & Answers
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What is GLC-ZX-SMD used for?
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How far can GLC-ZX-SMD reach?
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Can GLC-ZX-SMD connect to GLC-EX-SMD?
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Why does GLC-ZX-SMD need attenuation checks?
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Does GLC-ZX-SMD support digital monitoring?
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What fiber type does GLC-ZX-SMD require?
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When is GLC-ZX-SMD excessive?
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What platform check matters for GLC-ZX-SMD?
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