For cross-building SAN extensions, what realistic reach and optical budget should I plan when using the DS-SFP-FC8G-LW long-wave transceiver on single-mode fiber?

Design for ~10 km on standard SMF with a clean splice map and proper connector quality. Validate end-to-end loss with an OTDR, and add margin for seasonal temperature variations and patch-panel maintenance events.

If I already standardized on DS-SFP-FC8G-SW inside the DC, when should I justify switching to DS-SFP-FC8G-LW rather than adding repeaters or FCIP tunnels?

Move to LW when distance or patch loss exceeds SW limits, or when adding repeaters complicates availability. FCIP is useful over IP WANs, but for dedicated dark fiber, native 8G LW keeps latency predictable and operations simpler.

Are there operational gotchas when mixing DS-SFP-FC8G-LW links with short-wave links on the same Cisco MDS 9148T or 9396T chassis?

No functional conflict exists. Treat each port individually: keep LW to LW, SW to SW. Maintain separate optic spares and document which trunks are distance-sensitive to avoid accidental SW patching onto SMF runs.

How should buffer-to-buffer credits be sized for long DS-SFP-FC8G-LW inter-switch links to avoid throttling storage replication traffic?

Estimate round-trip latency by fiber distance (roughly 5 μs/km) and add switch delays; size credits so the wire never starves. Cisco calculators or vendor guides provide exact formulas—test with synthetic IO before production.

What cleaning and handling disciplines are mandatory on single-mode DS-SFP-FC8G-LW to prevent chronic CRCs and intermittent fabric flaps?

Use SMF-rated cleaning sticks, inspect every LC under a scope, cap ports when idle, and avoid touching ferrules. Even tiny dust particles can push power below receiver thresholds across long distances.

In a dual-fabric design, how can I build path diversity for DS-SFP-FC8G-LW to survive construction cuts or campus fiber maintenance?

Run diverse conduits and geographically separate patch routes. Terminate on different panels and trays, and avoid common-mode failure points like shared risers or manholes. Test failover during off-peak windows.

Can DS-SFP-FC8G-LW interoperate with third-party single-mode 8G optics in mixed vendor environments if procurement constraints arise?

Often yes, but support and DOM accuracy vary. Lab-test the exact pair, confirm wavelength/power compatibility, and document any quirks. For production, matched Cisco optics simplify TAC engagement and diagnostics.

What’s the recommended monitoring profile for long-wave 8G ports during seasonal temperature swings that affect outdoor fiber?

Increase polling frequency for DOM, log power trends, and set adaptive alerts. Correlate errors with temperature sensors where available, and schedule proactive cleaning following storms or maintenance.

If we are planning migration to 16G, does investing in DS-SFP-FC8G-LW now risk early obsolescence for our campus spans?

Not necessarily. Single-mode cabling remains. You can later replace optics with DS-SFP-FC16G-LW or FC32G-LW as equipment upgrades arrive, keeping the same fiber routes and diversity design intact.

DS-SFP-FC8G-LW – 8Gbps Fibre Channel LW SFP+

Name: DS-SFP-FC8G-LW Price & DataSheet - Cisco Optics Modules
SKU: DS-SFP-FC8G-LW
Price: 39.00 USD
Availability: InStock
Rating: 5.00 (3 reviews)

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DS-SFP-FC8G-LW

Rated 5.00 out of 5 based on 3 customer ratings

(3 customer reviews)

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DS-SFP-FC8G-LW Description

The Cisco DS-SFP-FC8G-LW is an 8 Gbps Fibre Channel longwave SFP+ transceiver for Cisco MDS 9000 Series switches and enterprise storage platforms. It is backward-compatible with 4 Gbps and 2 Gbps Fibre Channel, ensuring investment protection in mixed SAN environments.Operating at 1310 nm over single-mode fiber, the DS-SFP-FC8G-LW supports distances up to 10 km, making it suitable for campus networks, metro storage interconnects, and long-distance enterprise SAN deployments.With its hot-swappable form factor, Digital Optical Monitoring (DOM), and low power consumption (~1 W), the module delivers reliable performance and simplifies network management. It fully complies with Fibre Channel standards (FC-PI-4, SFF-8431, SFF-8472) for seamless interoperability.

Product Highlights

Data Rate

Maximum Reach

Wavelength

Product Comparison

Parameter	DS-SFP-FC8G-SW	DS-SFP-FC8G-LW
Form Factor	SFP+	SFP+
Data Rate	2/4/8 Gbps autosensing	2/4/8 Gbps autosensing
Wavelength	850 nm (Shortwave)	1310 nm (Longwave)
Media	MMF (OM2/OM3/OM4/OM5)	SMF (G.652)
Max Reach	150 m (OM4), 100 m (OM3)	10 km
Connector	Dual LC	Dual LC
Tx Power (dBm)	-7.5 to -1.0	-5.0 to +2.0
Rx Power (dBm)	-12.0 to 0	-12.0 to +2.0
DOM Support	Yes	Yes
Power Consumption	1 W	1 W
Operating Temperature	0°C to 70°C	0°C to 70°C
Standards	FC-PI-4, SFF-8431, SFF-8472	FC-PI-4, SFF-8431, SFF-8472

DS-SFP-FC8G-LW Device Compatibility Reference

DownloadDS-SFP-FC8G-LW-Device-Compatibility.pdf

Specifications

Parameter	Specification	Parameter	Specification
Product ID	DS-SFP-FC8G-LW	Form Factor	SFP+
Standard	8G Fibre Channel LW	Data Rate	2/4/8 Gbps autosensing
Wavelength	1310 nm	Connector	LC duplex
Fiber Type	SMF (G.652)	Maximum Reach	10 km
Transmit Power	-5.0 to +2.0 dBm	Receive Power	-12.0 to +2.0 dBm
DOM Support	Yes	Power Consumption	≤1 W
Operating Temp	0°C to 70°C	Storage Temp	-40°C to 85°C
Dimensions	8.5 × 13.55 × 56.5 mm	Weight	22.5 g
Warranty	5 years	Standards	FC-PI-4, SFF-8431/8472

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A smooth deal. No complications. Equipment arrived in perfect shape.

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Questions & Answers

For cross-building SAN extensions, what realistic reach and optical budget should I plan when using the DS-SFP-FC8G-LW long-wave transceiver on single-mode fiber?
Design for ~10 km on standard SMF with a clean splice map and proper connector quality. Validate end-to-end loss with an OTDR, and add margin for seasonal temperature variations and patch-panel maintenance events.
If I already standardized on DS-SFP-FC8G-SW inside the DC, when should I justify switching to DS-SFP-FC8G-LW rather than adding repeaters or FCIP tunnels?
Move to LW when distance or patch loss exceeds SW limits, or when adding repeaters complicates availability. FCIP is useful over IP WANs, but for dedicated dark fiber, native 8G LW keeps latency predictable and operations simpler.
Are there operational gotchas when mixing DS-SFP-FC8G-LW links with short-wave links on the same Cisco MDS 9148T or 9396T chassis?
No functional conflict exists. Treat each port individually: keep LW to LW, SW to SW. Maintain separate optic spares and document which trunks are distance-sensitive to avoid accidental SW patching onto SMF runs.
How should buffer-to-buffer credits be sized for long DS-SFP-FC8G-LW inter-switch links to avoid throttling storage replication traffic?
Estimate round-trip latency by fiber distance (roughly 5 μs/km) and add switch delays; size credits so the wire never starves. Cisco calculators or vendor guides provide exact formulas—test with synthetic IO before production.
What cleaning and handling disciplines are mandatory on single-mode DS-SFP-FC8G-LW to prevent chronic CRCs and intermittent fabric flaps?
Use SMF-rated cleaning sticks, inspect every LC under a scope, cap ports when idle, and avoid touching ferrules. Even tiny dust particles can push power below receiver thresholds across long distances.
In a dual-fabric design, how can I build path diversity for DS-SFP-FC8G-LW to survive construction cuts or campus fiber maintenance?
Run diverse conduits and geographically separate patch routes. Terminate on different panels and trays, and avoid common-mode failure points like shared risers or manholes. Test failover during off-peak windows.
Can DS-SFP-FC8G-LW interoperate with third-party single-mode 8G optics in mixed vendor environments if procurement constraints arise?
Often yes, but support and DOM accuracy vary. Lab-test the exact pair, confirm wavelength/power compatibility, and document any quirks. For production, matched Cisco optics simplify TAC engagement and diagnostics.
What’s the recommended monitoring profile for long-wave 8G ports during seasonal temperature swings that affect outdoor fiber?
Increase polling frequency for DOM, log power trends, and set adaptive alerts. Correlate errors with temperature sensors where available, and schedule proactive cleaning following storms or maintenance.
If we are planning migration to 16G, does investing in DS-SFP-FC8G-LW now risk early obsolescence for our campus spans?
Not necessarily. Single-mode cabling remains. You can later replace optics with DS-SFP-FC16G-LW or FC32G-LW as equipment upgrades arrive, keeping the same fiber routes and diversity design intact.

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Resources Downloads

DS-SFP-FC8G-LW Datasheet

Product Tag

SFP

DS-SFP-FC8G-LW – 8Gbps Fibre Channel LW SFP+

DS-SFP-FC8G-LW Description

Product Highlights

Product Comparison

DS-SFP-FC8G-LW Device Compatibility Reference

Specifications

Get More Information

Quality Certifications

Customer Reviews

Questions & Answers

For cross-building SAN extensions, what realistic reach and optical budget should I plan when using the DS-SFP-FC8G-LW long-wave transceiver on single-mode fiber?

If I already standardized on DS-SFP-FC8G-SW inside the DC, when should I justify switching to DS-SFP-FC8G-LW rather than adding repeaters or FCIP tunnels?

Are there operational gotchas when mixing DS-SFP-FC8G-LW links with short-wave links on the same Cisco MDS 9148T or 9396T chassis?

How should buffer-to-buffer credits be sized for long DS-SFP-FC8G-LW inter-switch links to avoid throttling storage replication traffic?

What cleaning and handling disciplines are mandatory on single-mode DS-SFP-FC8G-LW to prevent chronic CRCs and intermittent fabric flaps?

In a dual-fabric design, how can I build path diversity for DS-SFP-FC8G-LW to survive construction cuts or campus fiber maintenance?

Can DS-SFP-FC8G-LW interoperate with third-party single-mode 8G optics in mixed vendor environments if procurement constraints arise?

What’s the recommended monitoring profile for long-wave 8G ports during seasonal temperature swings that affect outdoor fiber?

If we are planning migration to 16G, does investing in DS-SFP-FC8G-LW now risk early obsolescence for our campus spans?

Warranty

Standard Services

Resources Downloads

Product Tag

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