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QSFP+ 40G LX4 Optical Transceiver Modules

QSFP+ 40GBASE-LX4 over Multimode and Singlemode Fibre

QSFP+ 40G Transceiver Module

Complete Connect offers a hot pluggable QSFP+ 40GBASE-LX4 transceiver module. It has been designed for use in 40 Gigabit Ethernet links over both MMF and SMF with transmission distances of up to 150m on MMF (OM3) and 2km on SMF.

The LX4 40G transceiver transmitter DFB array converts 4 inputs channels 10Gbps electrical data to 4 CWDM optical signals and multiplexes them into a single channel for 40Gbps optical transmission.

The receiver optically de-multiplexes a 40Gbps input into 4 CWDM channels signals and converts them to 4 channels of output electrical data from the 40GBASE-LX4 transceiver.

The 40G QSFP+ LX4 transceiver’s central wavelengths of the 4 CWDM channels are 1271nm, 1291nm, 1311nm and 1331nm as CWDM wavelength grid defined in ITU-T G694.2.

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Digital diagnostics functions are available via an I2C interface, as specified by the QSFP+ MSA. The transceiver is RoHS compliant and lead free.

Specification Summary

Data Rate 44.8 Gbps
Data Rate per Channel 44.8 Gbps over 4 wavelengths
Transmission Distance 150m on OM3 and 2km on Singlemode
Form Factor Hot Pluggable QSFP+
Port Type MPO (MTP) / LC
Transmitter Uncooled 4 x 10 Gbps CWDM
Electrical Interface XLPPI
Power Consumption < 3.5W
Temperature Range -0 to +70°C
Product Warranty 25 year fully covered

Compliance / Standards / Applications

QSFP+ MSA Compliant SFF-8436
IEC IEC/EN 61000-4-2, IEC-60825
FDA 21 CFR 1040.10 and 1040.11
IEEE Compliant IEEE 802.3ba
Common Model Logic Compatible
RoHS-6 Compliant
Ethernet 40GBASE-SR4 and 10GBASE-SR
InfiniBand QDR, DDR and SDR
Digital Diagnostics Via I2C interface

Required Cabling

Direct Connection M400 Series Patch Cords
Breakout to Separate Channels M400 Series Breakout Cables
Port Cleaning MPO / MTP Cleaning Tool


In stock Yes – same day dispatch
CC Price Promise Yes – on a like for like product and service
Technical Support Yes – qualified technicians on tap
Compatibility Assured

All our transceivers are coded with the correct EEPROM (electrically erasable programmable read-only memory) to match your manufacturers codes. Not all manufacturers require a code, only the ones that try to tie you into buying their optics at inflated prices. Complete Connect have a professional team who are able to engineer code and new firmware releases from manufacturers to ensure we offer up to date compatibility with all major OEM, switch, router and storage device vendors.

Compatible to these brands

A – D

Brand XXX Code
3Com 3CX
Arista ARX
Aditran ADX
Alcatel Lucent ALX
Allied Telesis ATX
Broadcom BOX
Brocade BRX
Ciena CNX
Cisco CIX
Dell DEX
D-Link DLX

E – H

Brand XXX Code
Emulex EUX
Enterasys ENX
Ericsson ERX
Extreme EXX
F5 F5X
Finisar FIX
Force10 F1X
Fortinet FOX
Foundry FUX
Huawei HUX

I – P

Brand XXX Code
Intel INX
Juniper JUX
Linksys LIX
Marconi MRX
McAfee MCX
Moxa MOX
NetGear NGX
NokiaSiemens NSX
Nortel NOX
PacketFront PFX
Planet PLX

Q – Z

Brand XXX Code
Qlogic QLX
Redback RBX
Riverstone RSX
Sixnet SNX
Telco TLX
Transition TNX
Trendnet TDX
Vixel VXX
Complete Peace of Mind

UK Supplied

Purchase from a UK company with all the benefits this offers.

Performance Warranty

We are very confident in the performance and reliability of our entire range of optical transceivers that we offer a lifetime performance warranty. This is combined with our outstanding service and support levels to ensure complete peace of mind.

DDM (Digital Diagnostic Monitoring)

Full DDM and reporting functionality is available via an I2C interface in real time, these parameters include; optical output power, optical input power, temperature, laser bias current and transceiver supply voltage.

Laser Safety

This is a Class 1 Laser Product according to IEC 60825-1:2007. This product complies with 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007).

MSA Compliant

All our QSFP+ optical transceivers are built to MSA (Multi Source Agreement) standards and are extensively tested to ensure 100% compatibility with a huge range of leading switch and device manufacturers. Our eSR4 optics are fully compliant with:

QSFP+ MSA 8436.
SFF-8472 DDM monitoring
IEEE 802.3ba 40GBASE-SR4.
RoHS and lead-free as per directive 2011/65/EU.

Why choose optical transceivers from Complete Connect?

Complete Connect is a leading supplier of quality, high performance SFP, SFP28, QSFP+, QSFP28 and CFP optical transceivers. All our transceivers are built to MSA (Multi Source Agreement) standards and are extensively tested. 100% compatibility is assured with a huge range of leading switch and device manufacturers. Each transceiver offers performance and reliability and comes with an extensive warranty.

This is combined with our outstanding service and support levels to ensure complete peace of mind.


+44 (0)20 8286 6529

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