100G-ER4LT-QSFP40KM Extreme Compatible 100G QSFP28 40KM Transceiver
Extreme compatible 100G-ER4LT-QSFP40KM - Key Features
- Compatibility: Extreme
- Media Type: Single-Mode Fiber (SMF)
- Connector: Double LC/UPC
- Fiber Count: Duplex
- Maximum Distance: 40 km
- Average Link Budget: 22 dB
- Tx Wavelength: 1310 nm
- Supported Data Rate: 112 Gbps
- DDM/DOM: Supported
- Forward Error Correction (FEC): Host FEC Supported
- Temperature Range: Standard 0°-70°C
Extreme 100G-ER4LT-QSFP40KM Price
In Stock - Ships Next Business DayExtreme compatible 100G-ER4LT-QSFP40KM 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 | 40 km |
Average Link Budget | 22 dB |
TX Wavelength | 4-channel LAN WDM (1295.56/1300.05/1304.58/1309.14 nm) |
RX Wavelength | 4-channel LAN WDM (1295.56/1300.05/1304.58/1309.14 nm) |
Supported Data Rate | 112 Gbps |
Supported Ethernet Applications | 100G Ethernet (103.125 Gbps) |
Supported Fiber Channel Applications | 4x 32G Fiber Channel (112.2Gbps) |
Optical Transport Network (OTN) Applications | OTU4 (112 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 | -2 dBm |
Average Launch Power (Max) Each Lane | 4 dBm |
Extinction Ratio (Min) | 4 dB |
Receiver Type | APD 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 | -21 dBm |
Average Receiver Sensitivity (Max) Each Lane | -18 dBm |
Receiver Overload | -1 dBm |
Temperature Range | Standard 0°-70°C |
Storage Temperature | -40° to 85°C |
Relative Humidity | 5 to 85% |
Power Consumption (Max) | 4.5 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-ER4 Lite, 128GFC Gen 6, OTN OTU4, QSFP28 MSA, SFF-8636 (Management Interface for 4-lane modules), SFF-8665 |
Extreme compatible 100G-ER4LT-QSFP40KM Datasheet
v2Complete technical specifications and product details
Extreme compatible 100G-ER4LT-QSFP40KM Description
100G-ER4LT-QSFP40KM is Extreme Networks' part number for a 100GBASE-ER4 Lite QSFP28 transceiver. The “ER4LT” in the SKU designates ER4 Lite, and “40KM” indicates the rated reach over single-mode fiber. EdgeOptic's compatible replacement is built on our 100G-QSFP28-40 platform, matching the original optical and electrical specifications.
Extreme Networks uses descriptive SKU naming where each segment encodes a specification: 100G for the line rate, ER4LT for the ER4 Lite optics class, QSFP for the QSFP28 form factor, and 40KM for the fiber reach. This part appears in Extreme's optics compatibility matrix for the ExtremeSwitching X690 (X690-48x-2q-4c), X695, and VSP 7400 platforms. The module also appears in documentation for the older Summit X670-G2 series under backward-compatibility notes, though X670-G2 100G port counts are limited to the stacking/uplink ports only.
The optical interface transmits four 25G NRZ lanes on LAN WDM wavelengths (1295.56, 1300.05, 1304.58, 1309.14 nm) through duplex LC/UPC connectors over G.652 single-mode fiber. Four EML transmitters on the Tx side and four PIN photodiodes with TIA stages on the Rx side handle the electro-optical conversion. Per-lane launch power is approximately -2.9 dBm minimum, with receiver sensitivity around -20.9 dBm under FEC. The ER4 Lite specification relies on host-side FEC to close the 40 km link budget, distinguishing it from the full 100GBASE-ER4 standard that achieves 40 km without error correction assistance.
Extreme's EXOS and Fabric Engine (formerly VOSS) operating systems perform transceiver vendor validation during module insertion. EdgeOptic's compatible is programmed with Extreme-recognized EEPROM identifiers, so the module passes validation on X690, X695, and VSP 7400 without 'configure ports slot/port vendor-metrics off' or other bypass commands. DDM telemetry is reported through 'show ports transceiver information detail' on EXOS. On Fabric Engine platforms, the equivalent command is 'show interfaces gigabitEthernet pluggable-optical-modules'. Both operating systems expose DDM values via SNMP for NMS integration.
For campus or metro backbone links requiring 40 km 100G between Extreme switches, the 100G-ER4LT-QSFP40KM provides the reach without external amplification or dispersion compensation. Verify that both endpoints use the same ER4 Lite module type or a compatible ER4 optic. Pairing with a 10 km LR4 module on the far end is outside the supported link budget for distances beyond 10 km. For volume pricing on Extreme-compatible optics, contact our sales team
Frequently Asked Questions
Which Extreme switches support the 100G-ER4LT-QSFP40KM?
The 100G-ER4LT-QSFP40KM is supported on ExtremeSwitching X870 (32 QSFP28 ports), X690 (QSFP28 uplinks), and 5520 series. Verify compatibility at optics.extremenetworks.com for your specific model and ExtremeXOS version.
What does the LT suffix mean on 100G-ER4LT-QSFP40KM?
The LT stands for extended temperature support. This module is rated for a wider operating temperature range than the standard commercial variant, making it suitable for environments with less controlled cooling.
Do I need a license for third-party optics on Extreme switches?
Some Extreme platforms require a 3rd Party Optics Feature license to recognize non-Extreme modules. Check your ExtremeXOS version and platform documentation. Our module is coded with Extreme-compatible EEPROM values.
Does the 100G-ER4LT-QSFP40KM require FEC for 40 km?
Yes. Without host FEC, the module reaches approximately 30 km. With FEC enabled, reach extends to 40 km. Configure FEC at the interface level and ensure the remote end matches.