GLC-LX-SM-RGD – 1000BASE-LX/LH 1310nm – 10 km SMF / 550 m MMF – Industrial Temperature SFP
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GLC-LX-SM-RGD Description
The GLC-LX-SM-RGD is the Cisco 1000BASE-LX/LH long wavelength rugged SFP module, the industrial-temperature member of the Gigabit Ethernet SFP family and the optic ordered when a 1G fiber link has to survive an uncontrolled enclosure. It is compatible with the IEEE 802.3z 1000BASE-LX standard, transmits at 1310 nm across a 1270 to 1355 nm window, and runs on standard single-mode fiber spans of up to 10 km or on any multimode fiber up to 550 m, with a 2 m minimum fiber distance at the short end. Over legacy multimode fiber the transmitter should be coupled through a mode conditioning patch cable, and on multimode the 550 m figure applies to 62.5 micron fiber at 500 MHz-km as well as 50 micron fiber at 400 or 500 MHz-km. What separates this PID from the rest of the 1000BASE-LX/LH line is its IND temperature rating of -40 to 85 degrees C rather than the extended range other long-wavelength SFPs carry, matched by a -40 to 85 degrees C storage range. Transmit power runs -3 to -9.5 dBm against a -3 to -20 dBm receive window, maximum channel insertion loss is 6 dB on G.652 single-mode fiber and 2.4 dB on any multimode fiber, digital optical monitoring is supported, and the module keeps the standard 8.5 x 13.4 x 56.5 mm SFP body at 75 grams or less.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
GLC-LX-SM-RGD |
|
Optical standard |
1000BASE-LX/LH, compatible with IEEE 802.3z 1000BASE-LX |
|
Wavelength |
1310 nm, with a 1270 to 1355 nm transmit and receive range |
|
Reach |
Up to 10 km on single-mode fiber and up to 550 m on any multimode fiber, minimum 2 m |
|
Transmit and receive power |
-3 to -9.5 dBm transmit, -3 to -20 dBm receive |
|
Maximum channel insertion loss |
6 dB on G.652 single-mode fiber and 2.4 dB on any multimode fiber |
|
Operating temperature |
Industrial range IND, -40 to 85 degrees C (-40 to 185 degrees F) |
|
Digital optical monitoring |
Supported |
|
Power consumption |
Up to 1W per SFP port |
Application Scenarios
Installed in unheated roadside, trackside and utility cabinets where the enclosure follows ambient temperature across the full -40 to 85 degrees C band rather than a conditioned range.
Deployed on factory and process-plant fiber spans where the run crosses between buildings at up to 10 km and the equipment sits in cabinets exposed to process heat.
Used on single-mode links between substations, signalling huts and trackside equipment rooms, positions that combine long fiber runs with wide ambient swings.
Related Ordering Boundary
Temperature Class Against The Standard Long-Wavelength SFP
GLC-LX-SM-RGD and GLC-LH-SMD are both 1000BASE-LX/LH optics with the same wavelength, reach and optical power figures; the rugged PID carries the IND range of -40 to 85 degrees C while GLC-LH-SMD carries the EXT range of -5 to 85 degrees C, so the 35 degrees C at the cold end is the whole difference between the two order lines.
Reach And Fiber Type Against The Other Rugged Optics
Within the rugged group the split is by distance and fiber: GLC-SX-MM-RGD runs 850 nm on multimode only and reaches 220 m on FDDI-grade fiber up to 1000 m on OM3, OM4 or OM5, while GLC-ZX-SM-RGD runs 1550 nm on single-mode for approximately 70 km depending on link loss. A span between 550 m and 10 km on single-mode fiber is the band this PID covers.
Host Platform Support Sits Outside The Data Sheet
The Cisco SFP data sheet lists a generic platform table rather than a per-SKU support matrix, so host platform and software support for this optic is confirmed through the Cisco transceiver module device support tables instead.
Selection Guide
1. When The Cold End Justifies The Rugged PID
An enclosure that stays above -5 degrees C gets identical optical behaviour from GLC-LH-SMD, which shares the wavelength, the 10 km single-mode reach and the -3 to -9.5 dBm transmit window; the IND rating on GLC-LX-SM-RGD only earns its place where the ambient actually reaches down toward -40 degrees C.
2. The 550 m To 10 km Band On Single Mode
Spans under 550 m over multimode fiber are already covered by GLC-SX-MM-RGD at the same IND rating and a shorter, cheaper 850 nm optic, and spans beyond 10 km move to GLC-ZX-SM-RGD at approximately 70 km; this PID owns the middle band where single-mode fiber is installed but the run stays inside 10 km.
3. Legacy Multimode Adds A Cable Line Item
Running this long-wavelength optic over legacy multimode fiber requires the transmitter to be coupled through a mode conditioning patch cable, which turns a single-optic order into an optic plus cable order; a plant still on legacy multimode with runs inside 550 m avoids that entirely by taking the short-wavelength GLC-SX-MM-RGD.
4. Two Budgets Have To Close, Not One
Link distance is bounded by both optical power budget and channel insertion loss, and the loss ceiling is 6 dB on G.652 single-mode fiber against 2.4 dB on any multimode fiber; a 10 km span carrying several splices and patch panels can exhaust the insertion loss budget well before it reaches the published distance.
5. Monitoring Comes Built In
Digital optical monitoring is supported on this PID, so transmit power, receive power and temperature can be read from the host without an inline tap; deployments that depend on remote fiber diagnostics in unattended cabinets get that visibility without a separate instrument.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Host platform support |
Confirm the target switch or router appears in the Cisco transceiver module device support tables for this optic. |
The SFP data sheet lists only a generic platform table, so support has to be read from the compatibility tables rather than assumed from the form factor. |
|
Fiber type at both ends |
Confirm the installed plant is single-mode for spans beyond 550 m and that both ends terminate the same fiber type. |
The optic reaches 10 km only on single-mode fiber and drops to 550 m on any multimode fiber. |
|
Mode conditioning patch cable |
Confirm a mode conditioning patch cable is on the order when the run uses legacy multimode fiber. |
Cisco states the transmitter should be coupled through that cable on legacy multimode, and omitting it leaves the link unreliable. |
|
Insertion loss budget |
Confirm the measured span loss stays inside 6 dB on G.652 single-mode fiber or 2.4 dB on any multimode fiber. |
Distance alone does not guarantee operation, since both the power budget and the insertion loss ceiling must be met. |
|
Minimum span length |
Confirm the shortest link is at least 2 m of fiber. |
Cisco publishes a 2 m minimum fiber distance, and a shorter patch can overdrive the receiver. |
|
Ambient at the cold end |
Confirm the enclosure ambient actually falls below the -5 degrees C floor of the extended-range alternative. |
Paying for the IND rating adds nothing where the standard extended-range optic already covers the site. |
|
Matching optic at the far end |
Confirm the far-end optic is also 1000BASE-LX/LH at 1310 nm. |
A wavelength mismatch against an 850 nm or 1550 nm optic will not establish a link regardless of fiber type. |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | GLC-LX-SM-RGD | Cisco ordering description | 1000BASE-LX/LH long wavelength; rugged, spare part number GLC-LX-SM-RGD= |
| Optical standard | 1000BASE-LX/LH, compatible with the IEEE 802.3z 1000BASE-LX standard | Form factor | SFP |
| Wavelength | 1310 nm | Transmit and receive wavelength range | 1270 to 1355 nm |
| Single-mode fiber reach | Up to 10 km (32,821 ft) | Multimode fiber reach | Up to 550 m (1,804 ft) on any multimode fiber |
| Multimode fiber detail | 550 m on 62.5 micron fiber at 500 MHz-km, and 550 m on 50 micron fiber at 400 or 500 MHz-km | Minimum fiber distance | 2 m (6.5 feet) |
| Legacy multimode requirement | The transmitter should be coupled through a mode conditioning patch cable when used over legacy multimode fiber type | Transmit power range | -3 to -9.5 dBm |
| Receive power range | -3 to -20 dBm | Maximum channel insertion loss | 6 dB on G.652 single-mode fiber and 2.4 dB on any multimode fiber |
| Link distance limits | Bounded by both optical power budget and channel insertion loss, and both must be met for guaranteed operation | Digital optical monitoring | Supported |
| Operating temperature | Industrial temperature range IND, -40 to 85 degrees C (-40 to 185 degrees F) | Storage temperature | -40 to 85 degrees C (-40 to 185 degrees F) |
| Dimensions (H x W x D) | 8.5 x 13.4 x 56.5 mm | Weight | 75 grams or less |
| Power consumption | Up to 1W per SFP port | Safety certifications | Laser Class I 21CFR1040 LN#50 7/2001 and Laser Class I IEC 60825-1 |
| Standards compliance | IEEE 802.3z, IEEE 802.3ah, GR-20-CORE, GR-326-CORE, GR-1435-CORE and IEC 60603-7:2000 | Host compatibility reference | Host platform and software support is published in the Cisco transceiver module device support tables rather than in the SFP data sheet |
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