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The E10GSFPSR is a dual-rate SFP+ transceiver that supports both 10GBASE-SR and 1000BASE-SX over multimode fiber, using LC Duplex connectors and an 850 nm VCSEL. Intel validates it specifically for the X520 and X710 adapter families. Other SFP+ modules, even electrically identical ones, can be blocked at link-up by Intel's firmware validation routine.
Intel specifies a maximum link distance of 300 m for SR optics on 2000 MHz-km multimode fiber. OM4 cable has higher bandwidth-distance capacity, so it may extend reach somewhat beyond that ceiling, but 300 m is the figure Intel publishes. The module does not work over single-mode fiber; the 850 nm wavelength and multimode launch aperture are incompatible with SMF.
Intel firmware enforces strict module validation to keep the bit error rate below 10⁻¹², and an unqualified part can leave the port in a disabled state rather than degrading gracefully. That behavior is why host compatibility is the first thing to resolve, not the last.
Before you search for a part number, record the exact model of every NIC and line card at both ends of the link. Intel firmware validates module identity at link-up to maintain a bit error rate below 10⁻¹², so the adapter model determines which part numbers will actually train. Get this wrong and nothing else matters.
lspci output on Linux.allow_unsupported_sfp flag differently than current ones.If both ends are Intel X520 or X710, the OEM E10GSFPSR is the safest choice. If one end is a third-party switch, confirm that switch vendor's qualified optics list separately.
SR optics require multimode fiber. Intel specifies 300 m as the maximum distance for the E10GSFPSR on 2000 MHz-km multimode fiber, which corresponds to OM3. OM4 offers higher bandwidth-distance capacity and may support longer runs, but use that published figure as your planning ceiling unless you have tested data for your specific plant.
Use these steps to confirm your fiber plant before ordering:
The 10GBASE-SRL designation appears in some vendor documentation as a shorter-reach variant of SR on legacy OM1 or OM2 fiber. If your plant uses older cable, check whether the module is rated for SRL distances rather than full SR before ordering.
SR optical modules like the E10GSFPSR draw well within the standard SFP+ power budget. The cage power concern applies specifically to 10GBASE-T copper SFP+ modules: according to LINK-PP's 2026 report, those modules typically consume 2.5 W, which exceeds the 1.5 W cage specification on many Intel adapters. Do not apply that figure to SR optics.
For SR deployments, power matters most at the switch level. High-density line cards with 48 SFP+ ports can hit aggregate power limits when every port is populated. Check your switch's per-slot and per-chassis power budget against the module's rated consumption before filling all ports. If your rack runs hot, look at the extended-temperature E10GSFPSRX variant, which is rated for a wider operating temperature range than the standard module.
SR, LRM (sfp lrm), and LR cover three distinct physical scenarios. Picking the wrong one means either buying fiber you don't need or getting a module that won't reach.
| Variant | Wavelength | Fiber Type | Max Distance | Typical Use Case |
|---|---|---|---|---|
| SR (E10GSFPSR) | 850 nm | Multimode OM3/OM4 | 300 m (OM3) | Intra-building, top-of-rack to aggregation |
| LRM (sfp lrm / sfp 10g lrm) | 1310 nm | Multimode OM1/OM2/OM3 | 220 m | Legacy multimode plants with older cable grades |
| LR | 1310 nm | Single-mode OS1/OS2 | 10 km | Campus or inter-building runs |
LRM fills a specific gap: buildings wired with OM1 or OM2 cable that can't support standard SR at 10G. If your plant already runs OM3 or OM4, SR is the better pick. It costs less and delivers more headroom. LR is the answer only when the run exceeds what multimode can support, or when the fiber plant is single-mode throughout.
When Intel firmware rejects a module, the port logs an "Unsupported SFP+ Module" message and stays down. The standard workaround on Linux is to load the ixgbe driver with the allow_unsupported_sfp=1 parameter, which tells the driver to skip the OEM validation check and bring the link up.
Steps to apply the workaround on Linux:
sudo modprobe -r ixgbesudo modprobe ixgbe allow_unsupported_sfp=1options ixgbe allow_unsupported_sfp=1 to /etc/modprobe.d/ixgbe.conf.On Windows, the equivalent is a registry key change documented in Intel's driver release notes. On VMware ESXi, you set the parameter through the esxcli system module parameters command. This workaround may not function on every firmware version or driver release, so test it before deploying across a fleet.
OEM modules like the E10GSFPSR carry Intel's validation and need no driver workarounds on supported adapters. Compatible modules from third-party suppliers meet the same IEEE 802.3ae electrical and optical specs but are programmed with the vendor ID the host firmware expects, so they train without the allow_unsupported_sfp flag. The practical difference is cost and lead time: OEM parts carry a premium tied to brand validation, while compatible modules from qualified suppliers cost less and are often available faster, which matters when you need to populate a 48-port line card.
HYTOPTODEVICE is a global e-commerce supplier of optical transceiver modules and networking hardware, covering a wide range of speeds and form factors (SFP, SFP+, QSFP+, QSFP28, QSFP-DD, OSFP), with OEM/ODM and white-label solutions for data centers, ISPs, enterprises, and telecoms worldwide. Their compatible 10G SFP+ transceivers for switches and data centers include modules coded for Intel X520 and X710 adapters. For context on where optical module suppliers sit in the broader market, see this overview of top optical module leaders in co-packaged optics.
The right choice depends on your risk tolerance and procurement process. If your organization requires OEM parts for support contract reasons, the E10GSFPSR is the answer. If you need cost efficiency at scale and can validate a compatible module in your lab first, a qualified third-party option is a reasonable path.
A:Yes. The E10GSFPSR supports both 10GBASE-SR at 10 Gbps and 1000BASE-SX at 1 Gbps over multimode fiber. This dual-rate capability is useful when connecting to older gigabit switches during a phased upgrade. Speed negotiation depends on the host adapter and switch configuration, so confirm both ends support auto-negotiation or manually set the link speed to match.
A:The E10GSFPSRX is designed for environments where ambient temperatures exceed the commercial-grade operating range of the standard E10GSFPSR. The optical and electrical specs are the same: 850 nm, multimode fiber, LC Duplex, 10GBASE-SR. The distinction matters in industrial enclosures, outdoor cabinets, or poorly cooled data halls. If your rack temperatures stay within normal data center ranges, the standard module is sufficient.
A:The E10GSFPSR follows the IEEE 802.3ae 10GBASE-SR standard, so it will physically work in any SFP+ port that accepts multimode SR optics. Cisco, Arista, Juniper, and most other vendors support standard SR modules, though some enforce their own qualified optics lists. Check the switch vendor's compatibility matrix for your specific platform before ordering, especially on Cisco Catalyst or Nexus gear where the unsupported-module error also appears.
A:No. The E10GSFPSR uses an 850 nm VCSEL with a multimode launch aperture. Connecting it to single-mode fiber produces high insertion loss and will not achieve a working link at 10G distances. For single-mode runs, you need a 10GBASE-LR module operating at a longer wavelength. See the 10G SFP+ LR single-mode transceiver options for compatible alternatives.
A:10GBASE-SRL is a shortened-reach variant of the SR standard for legacy OM1 or OM2 multimode fiber. Standard 10GBASE-SR reaches its rated maximum on OM3 fiber. SRL modules are used when the fiber plant predates OM3 deployment and replacing the cable is not practical. If your building uses OM3 or OM4, standard SR gives you more distance headroom at comparable cost.
Q6: How far can the E10GSFPSR reach on OM3 and OM4 fiber?
A: 300 m on OM3, and possibly more on OM4. Intel publishes 300 m for 10GBASE-SR on 2000 MHz-km multimode fiber, which corresponds to OM3. OM4 has higher bandwidth-distance capacity, so it may support longer runs, but plan to the published ceiling unless you have tested data. Measure the total path including patch panels and slack loops before ordering. HYTOPTODEVICE lists reach by fiber grade on every 10G SFP+ module in its catalog.
Q7: Why does the E10GSFPSR use an 850 nm VCSEL?
A: Because 850 nm VCSELs are the low-cost laser for short-reach multimode links. The 850 nm wavelength pairs with OM3/OM4 fiber, which keeps SR optics affordable for intra-building runs. That same physics is why the module cannot work on single-mode fiber. If your run needs single-mode, step up to a 1310 nm LR module instead — HYTOPTODEVICE's 10G SFP+ range covers both.
Q8: Which Intel adapters are the E10GSFPSR validated for?
A: Intel validates it for the X520 and X710 adapter families. Intel firmware checks module identity at link-up, and sub-models differ within each family, so pull the exact NIC model and check Intel's compatibility matrix. A module that trains on one X520 variant may not train on another. That is why host compatibility is the first decision, not the last.
Q9: How do you fix the unsupported SFP+ module error on an Intel NIC?
A: Reload the ixgbe driver with allow_unsupported_sfp=1. First confirm the module is electrically compatible, then unload the driver with modprobe -r ixgbe, reload it with modprobe ixgbe allow_unsupported_sfp=1, and persist the setting in /etc/modprobe.d/ixgbe.conf. Note that older ixgbe releases handle this flag differently, so test on one port before fleet deployment.
Q10: When should you pick a 10G LRM module instead of SR?
A: Only when your plant is legacy OM1 or OM2 that cannot run SR at 10G. The 10G LRM module (sfp 10g lrm) uses 1310 nm and reaches 220 m on OM1/OM2/OM3 multimode. If your plant is already OM3 or OM4, SR is the better pick: lower cost and more distance headroom. LRM is the bridge for old buildings, not the default choice.
Q11: When do you need a 10GBASE-LR module?
A: Any run beyond multimode reach, or any link over single-mode fiber. 10GBASE-LR uses 1310 nm and reaches 10 km on OS1/OS2 single-mode, which is why campus and inter-building runs are LR territory. The E10GSFPSR cannot cover single-mode at all. Match wavelength to fiber grade first, then distance, then host.
Q12: How much power does the E10GSFPSR draw?
A: Well within the standard 1.5 W SFP+ cage budget. The 2.5 W figure that causes cage problems belongs to 10GBASE-T copper modules, not SR optics. Power matters at the switch level: dense 48-port line cards can hit aggregate limits when every port is populated. If your rack runs hot, check the extended-temperature E10GSFPSRX variant instead.
Q13: Can a compatible module work in an Intel X520 without the OEM E10GSFPSR?
A: Yes, if it is coded with the Intel vendor ID. Compatible modules meet the same IEEE 802.3ae specs and are programmed so they train without the allow_unsupported_sfp flag. The OEM premium buys brand validation; compatible parts cost less and are often available faster for a 48-port build-out. HYTOPTODEVICE's 10G SFP+ collection includes modules coded for X520 and X710 adapters, with EEPROM programming on request.
Q14: How do you apply the unsupported-module workaround on Windows or ESXi?
A: Registry key on Windows, esxcli on ESXi. Windows uses a registry change documented in Intel's driver release notes; ESXi sets the parameter through the esxcli system module parameters command. The workaround does not work on every firmware version, so validate it in your lab before rolling out across a fleet.
Q15: What connector does the E10GSFPSR use, and can it work with SC or MPO?
A: LC Duplex, and only LC Duplex. SC or MPO panels need an adapter or re-termination before the module can link. Confirm connector type together with fiber grade, because a clean 300 m link still fails at the connector. Check both ends of the run, then order.
The E10GSFPSR is a dual-rate 10G/1G SFP+ module for Intel X520 and X710 adapters, running at 850 nm over multimode fiber with LC Duplex connectors. Getting the right module means confirming your adapter model, fiber grade, path length, and power budget before you place an order. Firmware validation on Intel NICs makes host compatibility non-negotiable.
Start by pulling your NIC model number and checking it against Intel's compatibility matrix. Then measure your fiber run, confirm the cable grade, and decide whether the OEM part or a qualified compatible module fits your budget and support requirements. If you hit the unsupported-module error after installing a compatible part, the allow_unsupported_sfp driver parameter is the first thing to test on Linux before assuming the module is faulty.
