DS-SFP-FC8G-LW – 8G FC Longwave SFP+ – LC SMF – 10km Reach
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DS-SFP-FC8G-LW Description
DS-SFP-FC8G-LW is a Cisco MDS 9000 Series 2/4/8-Gbps Fibre Channel longwave SFP+ transceiver for SAN links that need single-mode fiber reach between supported MDS switch ports. It uses an SFP+ form factor with dual LC connectors, 1310 nm optics, 9.0-micron single-mode fiber, and 2/4/8-Gbps autosensing operation, with Cisco-documented cable distance up to 10 km and compatibility coverage in the MDS 8.x and 9.x support matrices.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
DS-SFP-FC8G-LW |
|
Product type |
8-Gbps Fibre Channel longwave SFP+ transceiver |
|
Ordering description |
2/4/8-Gbps Fibre Channel-Longwave, SFP+, LC |
|
Form factor |
SFP+ |
|
Connector type |
Dual LC |
|
Fiber type |
Single-mode fiber |
|
Core size |
9.0 microns |
|
Wavelength |
1310 nm |
|
Fibre Channel rates |
2/4/8-Gbps autosensing |
|
Maximum reach |
10 km |
|
Compatible platform family |
Cisco MDS 9000 Series |
Application Scenarios
DS-SFP-FC8G-LW fits Cisco MDS Fibre Channel ports when the cable plant is LC single-mode fiber and the route stays inside Cisco’s 10 km longwave distance.
Maintenance teams can keep this part number tied to installed 1310 nm longwave fiber paths. The similar DS-SFP-FC8G-SW and DS-SFP-FC8G-ER names map to different optical media or reach.
New SAN port orders can include DS-SFP-FC8G-LW when the target MDS platform and NX-OS release column list support for 2/4/8-Gbps Fibre Channel longwave SFP+ optics.
Product Comparison
|
Parameter |
DS-SFP-FC8G-LW |
DS-SFP-FC8G-ER | |
|---|---|---|---|
|
Product type |
2/4/8G Fibre Channel longwave SFP+ |
2/4/8G Fibre Channel shortwave SFP+ |
2/4/8G Fibre Channel extended-reach SFP+ |
|
Ordering description |
2/4/8-Gbps Fibre Channel-Longwave, SFP+, LC |
2/4/8-Gbps Fibre Channel-Shortwave, SFP+, LC |
2/4/8-Gbps Fibre Channel Extended Reach SFP+, LC |
|
Connector type |
Dual LC |
Dual LC |
Dual LC |
|
Fiber type |
Single-mode fiber |
Multimode fiber |
Single-mode fiber |
|
Wavelength |
1310 nm |
850 nm |
1550 nm |
|
Core size |
9.0 microns |
62.5 microns OM1 or 50.0 microns OM2/OM3/OM4/OM5 |
9.0 microns |
|
Fibre Channel rates |
2/4/8-Gbps autosensing |
2/4/8-Gbps autosensing |
2/4/8-Gbps autosensing |
|
Maximum documented reach |
10 km |
Up to 190 m at 8.5 GBd depending on multimode fiber grade |
40 km |
|
Minimum cable distance |
2 m |
2 m |
2 m |
|
MDS 8.x support columns |
8.1(x), 8.2(x), 8.3(x), 8.4(x), and 8.5(x) on listed products |
8.1(x), 8.2(x), 8.3(x), 8.4(x), and 8.5(x) on listed products |
8.1(x), 8.2(x), 8.3(x), 8.4(x), and 8.5(x) on listed products |
|
MDS 9.x support columns |
9.2(x), 9.3(x), and 9.4(x) on listed products |
9.2(x), 9.3(x), and 9.4(x) on listed products |
9.2(x), 9.3(x), and 9.4(x) on listed products |
- In a DS-SFP-FC8G-LW vs DS-SFP-FC8G-SW comparison, the confirmed difference is fiber media and distance: LW uses 1310 nm single-mode fiber for 10 km links, while SW uses 850 nm multimode fiber for shorter 8G paths.
- The DS-SFP-FC8G-LW difference from DS-SFP-FC8G-ER is reach and wavelength. DS-SFP-FC8G-LW is the 10 km 1310 nm longwave optic, while DS-SFP-FC8G-ER is the 40 km 1550 nm extended-reach optic.
- For buyers comparing which model to choose, keep DS-SFP-FC8G-LW on orders that require Cisco 2/4/8G Fibre Channel longwave LC SMF optics rather than shortwave MMF or extended-reach 40 km optics.
Selection Guide
1. Match the link to single-mode fiber
Choose DS-SFP-FC8G-LW when the SAN path uses LC OS2 single-mode fiber and the route fits Cisco’s documented 10 km longwave specification.
2. Keep SW optics for multimode cabling
DS-SFP-FC8G-SW belongs on shortwave MMF paths. It should not replace DS-SFP-FC8G-LW on an existing single-mode fiber route.
3. Reserve ER for longer optical spans
DS-SFP-FC8G-ER is the adjacent extended-reach 40 km part. Select it only when the Cisco-supported design needs that distance instead of the 10 km LW profile.
4. Validate the supported MDS row
Check the Cisco MDS compatibility matrix for the exact switch, module, and NX-OS release before adding DS-SFP-FC8G-LW to a service spare order or expansion quote.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Purchase line label |
The BOM requests DS-SFP-FC8G-LW exactly |
Separates the 10 km LW optic from SW, ER, 4G, 10G, and 16G lookalike part numbers |
|
Receiving hardware |
The port is on an MDS product or module covered by Cisco’s support matrix |
Avoids treating a generic SFP+ cage as confirmed Fibre Channel support |
|
Software family |
The installed NX-OS train matches a supported 8.x or 9.x column for that hardware |
Keeps service spares and expansion optics inside the documented matrix |
|
Fiber handoff |
The patch path is duplex LC OS2 SMF with 9.0-micron core |
Confirms the order is for a longwave single-mode route rather than an MMF shortwave link |
|
Distance window |
The measured run is at least 6.5 ft and no more than 6.2 miles |
Maps the field cabling length to Cisco’s 2 m minimum and 10 km maximum |
|
Link partner |
The remote transceiver is a compatible 1310 nm 2/4/8G longwave Fibre Channel optic |
Prevents a wavelength, media, or Fibre Channel speed mismatch at turn-up |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | DS-SFP-FC8G-LW | Product type | 2/4/8-Gbps Fibre Channel longwave SFP+ transceiver |
| Ordering description | 2/4/8-Gbps Fibre Channel-Longwave, SFP+, LC | Spare ordering description | 2/4/8-Gbps Fibre Channel-Longwave, SFP+, LC, Spare |
| Form factor | SFP+ | Connector type | Dual LC |
| Compatible platform family | Cisco MDS 9000 Series | Fibre Channel connectivity | 2/4/8-Gbps ports |
| Fiber type | Single-mode fiber | Core size | 9.0 microns |
| Wavelength | 1310 nm | Fibre Channel rates | 2/4/8-Gbps autosensing |
| Baud rates | 2.125, 4.250, and 8.500 GBd | Maximum cable distance | 10 km |
| Minimum cable distance | 2 m | SMF requirement | ISO/IEC OS2 compliant single-mode fiber |
| Average transmit power | -11.7 to -3 dBm at 2G; -8.4 to -1 dBm at 4G; -8.4 to 0.5 dBm at 8G | Average receive power maximum | -3 dBm at 2G; -1 dBm at 4G; 0.5 dBm at 8G |
| Fiber-loss budget | 7.8 dB at 2G and 4G; 6.4 dB at 8G | Module dimensions | 8.5 x 13.55 x 56.5 mm |
| Operating temperature | 0 to 70 degrees C | Storage temperature | -40 to 85 degrees C |
| Laser class | Class I 21CFR1040 | MDS 8.x support matrix releases | 8.1(x), 8.2(x), 8.3(x), 8.4(x), and 8.5(x) |
| MDS 9.x support matrix releases | 9.2(x), 9.3(x), and 9.4(x) | Compatible MDS products in 9.x matrix | DS-X9448-768K9, DS-X9334-K9, DS-X9648-1536K9, MDS 9220i, MDS 9250i, MDS 9148S, MDS 9396S, MDS 9132T, MDS 9148T, and MDS 9396T |
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Quality Certifications
Customer Reviews
Questions & Answers
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What is DS-SFP-FC8G-LW?
-
How is DS-SFP-FC8G-LW different from DS-SFP-FC8G-SW?
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Which fiber type fits DS-SFP-FC8G-LW?
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When is DS-SFP-FC8G-LW still useful?
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Can DS-SFP-FC8G-LW be used during SAN upgrades?
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What problem appears with DS-SFP-FC8G-LW on poor fiber?
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Is DS-SFP-FC8G-LW an Ethernet optic?
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What spare policy fits DS-SFP-FC8G-LW?
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