QSFP-100G-LR4-S Cisco Compatible 100G 10KM SMF QSFP28 module
Cisco compatible QSFP-100G-LR4-S - Key Features
- Compatibility: Cisco
- Media Type: Single-Mode Fiber (SMF)
- Connector: Double LC/UPC
- Fiber Count: Duplex
- Maximum Distance: 10 km
- Guaranteed Link Budget: 6.3 dB
- Tx Wavelenght: 1310 nm
- Supported Data Rate: 112 Gbps
- DDM/DOM: Supported
- Forward Error Correction (FEC): Host FEC Supported
- Temperature Range: Standard 0°-70°C
Cisco QSFP-100G-LR4-S Price
SKU:100G-QSFP28-10-CI
In Stock - Ships Next Business DayCisco compatible QSFP-100G-LR4-S Specifications
Form Factor | QSFP28 |
Modulation | NRZ (Non-Return to Zero) |
Media Type | Single-Mode Fiber (SMF) |
Connector | Double LC/UPC |
Fiber Count | Duplex |
Maximum Distance | 10 km |
Guaranteed Link Budget | 6.3 dB |
TX Wavelenght | 4-channel LAN WDM (1295.56/1300.05/1304.58/1309.14 nm) |
RX Wavelenght | 4-channel LAN WDM (1295.56/1300.05/1304.58/1309.14 nm) |
Supported Data Rate | 112 Gbps |
Supportet Ethernet Applications | 100G Ethernet (103.125 Gbps) |
DDM/DOM | Supported |
Forward Error Correction (FEC) | Host FEC Supported |
Transmitter Type | EML Laser |
Tx Wave Bandwidth | 4 LAN WDM Seperated 1310 nm Lanes (15.66 nm 1294.53 – 1310.19nm) (L0 Tx center 1295.56nm, L1 Tx center 1300.05nm, L2 Tx center 1304.58nm, L3 Tx center 1309.14nm) |
Average Launch Power (Min) Each Lane | -4.3 dBm |
Average Launch Power (Max) Each Lane | 4.5 dBm |
Extinction Ratio (Min) | 4 dB |
Receiver Type | PIN photodiode |
RX Wave Bandwidth | 4 LAN WDM Seperated 1310 nm Lanes (15.66 nm 1294.53 – 1310.19nm) (L0 Tx center 1295.56nm, L1 Tx center 1300.05nm, L2 Tx center 1304.58nm, L3 Tx center 1309.14nm) |
Average Receiver Sensitivity (Min) Each Lane | -10.6 dBm |
Average Receiver Sensitivity (Max) Each Lane | -8.6 dBm |
Receiver Overload | 5.5 dBm |
Temperature Range | Standard 0°-70°C |
Storage Temperature | -40° to 85°C |
Relative Humidity | 5 to 85% |
Power Consumption (Max) | 3.5 W |
Power | +3.3V single power supply |
Compliance | CE, RoHS, Class 1 FDA and IEC60825-1 Laser Safety Compliant, IEEE 802.3ba, IEEE 802.3bm, 100GBASE-LR4, QSFP28 MSA, SFF-8636 (Management Interface for 4-lane modules), SFF-8665 |
Cisco compatible QSFP-100G-LR4-S Datasheet
v2Complete technical specifications and product details
Cisco compatible QSFP-100G-LR4-S Description
QSFP-100G-LR4-S is Cisco’s part number for a 100GBASE-LR4 QSFP28 optical transceiver. Our compatible version uses the same base module as our 100G-QSFP28-10 product, built to MSA specifications with Cisco-specific EEPROM programming. It is functionally and optically equivalent to the Cisco original.
The module transmits 100GbE over single-mode fiber using LAN WDM technology. Four wavelength channels at 1295.56, 1300.05, 1304.58, and 1309.14 nm each carry 25.78125 Gbps with NRZ modulation, for an aggregate line rate of 103.125 Gbps. The transmitter uses an EML (Electro-absorption Modulated Laser) array and the receiver a PIN photodiode array. The four channels are multiplexed within the 1310 nm window and carried over a single duplex fiber pair — two fibers instead of the eight required by parallel-fiber standards like 100GBASE-SR4.
The module provides a minimum optical link budget of 6.3 dB per IEEE 802.3ba, which supports distances up to 10 km over OS2 (G.652.D) single-mode fiber. Distance depends on actual fiber attenuation and connector losses in your specific plant — 10 km is calculated from the minimum link budget and typical cable attenuation values. The dual LC/UPC connector interface is compatible with standard SMF patch cords and structured cabling.
Digital diagnostic monitoring (DDM/DOM) gives real-time readings of transmitted and received optical power, module temperature, laser bias current, and supply voltage through the SFF-8636 management interface. The module has no internal FEC engine, but it is fully transparent to host-side RS-FEC (IEEE 802.3bj Clause 91). If your Cisco switch has RS-FEC enabled on the port, the module works normally. The module conforms to the QSFP28 MSA (SFF-8665) and presents a CAUI-4 host electrical interface (4x25G NRZ lanes per IEEE 802.3bj Clause 83). Operating temperature range is 0 to 70°C with maximum power consumption of 3.5W.
Our module is programmed with Cisco-specific EEPROM data and has been compatibility-tested on Nexus 9000 series switches, Catalyst 9500 series, and ASR 9000 series routers. The module works in any Cisco platform that lists QSFP-100G-LR4-S in its supported optics table — check Cisco’s transceiver compatibility matrix for your specific line card. We can also supply the module coded for other vendors; contact our engineering team if you need alternative platform coding.
The transceiver meets IEEE 802.3ba and IEEE 802.3bm 100GBASE-LR4 requirements and conforms to the QSFP28 MSA (SFF-8665, IEEE 802.3ba 100GBASE-LR4). It is CE/RoHS certified and compliant with Class 1 FDA and IEC 60825-1 laser safety standards. We measure optical parameters and inspect connectors on every unit before shipment. EEPROM data is validated against the target platform configuration. If you need technical consultation or a volume price for your project - contact our sales team.
Frequently Asked Questions
What is QSFP-100G-LR4-S price?
Our QSFP-100G-LR4-S compatible module is priced from €181.44 per unit. Volume discounts are available for project orders. The module ships from stock with typical lead time of 1-3 business days.
Where I can find QSFP-100G-LR4-S datasheet?
The QSFP-100G-LR4-S compatible module datasheet is available for download on this product page. It includes full optical and electrical specifications, pin assignments, and mechanical drawings based on the 100GBASE-LR4 QSFP28 MSA standard.
What is QSFP-100G-LR4-S compatibility?
The module is coded for Cisco QSFP-100G-LR4-S and works in any platform that accepts this PID. This includes Nexus 9000 and 9500 series switches, Catalyst 9500 and 9600 series, ASR 9000 and NCS 5500 routers, and other Cisco equipment with QSFP28 ports supporting 100GBASE-LR4. The base module can also be reprogrammed for other vendor equipment.
Is QSFP-100G-LR4-S eol?
As of March 2026, Cisco has not announced end-of-life for the QSFP-100G-LR4-S. The module remains in Cisco’s active product catalog. Our compatible version will continue to be available regardless of Cisco’s EOL decisions.
What is difference QSFP-100G-LR4-S vs QSFP-100G-LR-S?
QSFP-100G-LR4-S uses four LAN WDM wavelength channels around 1310 nm with NRZ modulation, requiring a duplex single-mode fiber pair. QSFP-100G-LR-S uses a single wavelength lane with PAM4 modulation on the same duplex SMF. Both reach 10 km. LR4-S works on more Cisco platforms since it uses the older CAUI-4 electrical interface. The LR-S design is newer and draws less power but requires a PAM4-capable host ASIC.
What is difference QSFP-100G-LR4-S vs QSFP-100G-LR4 ?
QSFP-100G-LR4-S is the part number of the Cisco part, while in the industry modules with this specification are often called QSFP-100G-LR4.
What is QSFP-100G-LR4-S COB vs BOX difference?
COB (Chip on Board) and BOX (Bare Die in Open Cavity) refer to different packaging methods for electronic components. Our compatible module will have COB packaging. Some time ago 100G LR4 modules had BOX packaging, but currently COB packaging is more mainstream.
Can QSFP-100G-LR4-S work in 40G QSFP+ port?
No, QSFP28 modules don’t work in QSFP+ ports.
Can you connect QSFP-100G-LR4-S with CFP/CFP2/CFP4 LR4?
Yes, you can connect QSFP-100G-LR4-S with CFP/CFP2/CFP4 LR4 as long as the Tx/Rx wavelengths match on both ends.
Can you use QSFP-100G-LR4-S in 400G QSFP-DD port?
Yes, QSFP+ and QSFP28 can work in QSFP-DD ports, as long as the port supports a lower data rate.
What are the differences between QSFP-100G-LR4-S vs QSFP-100G-SR4-S?
QSFP-100G-LR4-S uses Single-Mode Fiber (SMF) that can reach up to 10Km distances. QSFP-100G-SR4-S uses Multi-Mode Fiber (MMF) and can reach up to 100m distances over OM4 cable.
Does QSFP-100G-LR4-S use FEC?
The module has no internal FEC engine. However, it is fully compatible with host-side RS-FEC (IEEE 802.3bj Clause 91), which runs in the switch ASIC, not in the transceiver. If your Cisco platform has RS-FEC enabled on the port, the module will work correctly. For a module with internal FEC support for OTU4 applications, see our 100G-QSFP28-12.
Does QSFP-100G-LR4-S support OTU4?
No, OTU4 is not supported. For a module that supports OTU4, please see our 100G-QSFP28-12 module.
Which Cisco platforms support QSFP-100G-LR4-S?
QSFP-100G-LR4-S is supported on Nexus 9000 and 9500 series, Catalyst 9500 and 9600 series, ASR 9000 series, and NCS 5500 and 5700 series. Check Cisco’s transceiver compatibility matrix for your specific platform and line card PID, as support varies by line card.
What is difference between QSFP-100G-LR4-S and QSFP-100G-LR4-S=?
The "=" suffix in Cisco part numbers is an ordering designation for spare or standalone units, used when ordering separately rather than as part of a system bundle. QSFP-100G-LR4-S and QSFP-100G-LR4-S= are the same module with identical hardware. Our compatible module works for both PIDs.
What lead time should I expect for QSFP-100G-LR4-S?
Standard orders ship within 1-3 business days from our European warehouse. For large project quantities, contact us for availability and scheduling.