40G QSFP+ Module for High-speed Connection Networks

Are you still worrying about your network speed? Actually, there is no need to worry about this. The dramatic growth in bandwidth requirements has led to the increasing worldwide use of higher-performance optical products. Like 40G QSFP module, they support 40G network and allow data rates of 4×10 Gbit/s to be enjoyed by users in better-performance data transmission. This article introduces 40G QSFP+ module in details, which include 40G QSFP+ module and 40G QSFP+ cables.

40G QSFP+ Module Introduction

40G QSFP+ module is a compact, hot-pluggable transceiver used for data communications applications. QSFP+ transceivers are designed to carry Serial Attached SCSI, 40G Ethernet, QDR (40G) and FDR (56G) Infiniband, and other communications standards. QSFP+ modules increase the port-density by 3x-4x compared to SFP+ modules.

Main Features of 40G QSFP Module
  • Support for 40GBASE Ethernet;
  • Flexibility of interface choice;
  • Interfaces available in various form factors;
  • Certified and tested on QSFP 40G ports for superior performance, quality, and reliability;
40G QSFP Module Overview

40G QSFP module are high-density interfaces addressing deployment of high-performance computing in data center clouds. 40GBASE QSFP+ modules in this article are mainly introduced in two different flavors: 40G LR4 QSFP+ transceiver, and 40G SR4 QSFP+ transceiver.

40G LR4 Transceiver—40GBASE-LR4 (“long range”) is a port type for single-mode fiber and uses 1300nm lasers. 40G LR4 QSFP+ transceiver supports 40GBASE Ethernet rate. The 40 Gigabit Ethernet signal is carried over four wavelengths. Multiplexing and demultiplexing of the four wavelengths are managed within the device.

40G SR4 QSFP+ Transceiver—40GBASE-SR4 (“short range”) is a port type for multi-mode fiber and uses 850nm lasers. Take HP 720187-B21 transceiver for example, Fiberstore compatible HP 720187-B21 enables high-bandwidth 40G optical links and support link lengths of 100m and 150m respectively, on OM3 and OM4 multimode fibers at a wavelength of 850nm.

40G QSFP+ Cable Details

Just like 10GbE optics, there are also direct attach cables(DAC) available for 40GbE modules when short distance (within the same rack) is needed. A variety of short-reach copper options are made available to enable 40GbE connection networks.

Direct Attach Copper Cable Reaches for 40GbE

Direct attach copper cables are designed in either active or passive versions. Both are widely used for 40G QSFP+ module solutions. For example, Juniper JNP-QSFP-DAC-7MA runs over active copper cable for very short distances. And Fiberstore compatible Juniper JNP-QSFP-DAC-7MA offers a very cost-effective way to establish a 40gigabit link between QSFP ports of Juniper switches within racks and across adjacent racks.

There are also active optical cables available for 40GbE, like FCBG410QB1C10. This transceiver runs over active optical cable for 40GBASE Ethernet.


40GbE ports are capable of running in a 4x 10GbE mode, allowing for easy 10GbE/40GbE mixed media deployments. Fiberstore offers a broad selection of 40G QSFP modules for high-speed network connections, including the above-mentioned HP 720187-B21 and Juniper JNP-QSFP-DAC-7MA. For more information about 40G QSFP+ transceivers and 40G QSFP+ cables, you can visit Fiberstore.