24-Fiber Trunk Cabling Solution for 40 Gigabit Ethernet

Year by year, the amount of data transmitted at data centers is skyrocketing as networks need to support more devices and advanced applications than ever before. Typical transmission speeds in the data center are also increasing from 10Gbps to 40Gbps, to 100Gbps or beyond, and in 2010, the IEEE ratified the 40 and 100 gigabit Ethernet (GbE) standard.

Data centers, at the heart of tremendous amount of data to be transmitted, need fiber optic links greatly to provide high bandwidth and low latency for data operation. The 24-fiber trunk cables, one type of fiber optic links, are able to deliver higher data transmission speed and bandwidth, better performance and more efficient scalability. 24-fiber trunk cables are considered as the suitable solution for 40GbE transmission. This text mainly introduces one 40GbE cabling solution: 24-fiber trunk cables.

What Does the 40GbE Standard Define?

The efforts aimed to support speeds of 40Gbps led to the ratification of the 802.3ba standard. This standard for 40Gbps uses parallel optics, or multiple lanes of fiber transmitting at the same speed. Most 40GbE infrastructure uses a 12-fiber MPO connector, requiring 8 fibers, with each 4 fibers transmitting at 10Gbps and the other 4 fibers receiving at 10Gbps, while the inner 4 optical fibers are left unused. According to IEEE 802.3ba standard, multi-mode fiber (MMF) supports 40GbE with link lengths up to 100m over OM3 optical fiber and up to 150m over OM4. Single-mode fiber (SMF)supports 40GbE with link lengths up to 40km when applied for longer distance transmission. Besides, copper cable is is also capable of supporting 40GbE when very short distance is required, such as EX-QSFP-40GE-DAC-50CM and QFX-QSFP-DAC-3M. Take QFX-QSFP-DAC-3M for example, Fiberstore compatible Juniper QFX-QSFP-DAC-3M establishes 40GbE with the link lengths of 3m.

QFX-QSFP-DAC-3M establishes 40GbE with the link lengths of 3m

Here introduces a better standards-based 40GbE cabling solution with 24-fiber trunk cables.

The use of 24-fiber trunk cables between switch panels and equipment is a wise solution. In this approach, 24-fiber trunk cables with 24-fiber MPOs on both ends are used to connect from the back of the switch panel to the equipment distribution area. This solution is appropriate for 40GbE owing to its following advantages.

Reduced Cable Congestion

Another advantage of using 24-fiber trunk cables comes to the reduced cable congestion. Data centers’ priority is the space in infrastructure, since congested cables would make cable management more difficult. 24-fiber trunk cables are only appreciably larger than 12-fiber trunk cables at 3.8 mm in diameter, compared to 3 mm. That means the 24-fiber trunk cables provide twice the amount of fiber in less than 21% space. For a 40GbE application, it takes three 12-fiber trunk cables to provide the same number of links as a single 24-fiber trunk cable.

24-fiber trunk  cableS reduce cable congestion

Maximum Fiber Utilization

As mentioned previously, 40GbE uses eight fibers of a 12-fiber MPO connector, the remaining four fibers unused. When using a 12-fiber trunk cable, those same four fibers are also unused. But with the use of 24-fiber trunk cables, all the fibers are actually used. The use of all the 24-fiber trunk cables create three 40GbE links. This recoups 33% of the fibers that would be lost with 12-fiber trunk cables, providing a much better return on investment.


24-fiber trunk cabling solution delivers high bandwidth to data-hungry applications along with low end to end latency, enabling data centers to operate with high performance and efficiency. Fiberstore supplies a large number of 24-fiber trunk cables, and other cables for 40G solution, including EX-QSFP-40GE-DAC-50CM and QFX-QSFP-DAC-3M mentioned above. Besides, Fiberstore also offers other 40G solution products, like 40G QSFP+ transceivers which are fully compatible with major brand, such as Cisco, HP and Dell (eg. Dell QSFP+), You can visit Fiberstore for more information about 40G solution.

Introducing Juniper 40G QSFP+ Transceivers

It’s no doubt that 10Gbps speeds for individual streams have been routinely reached under today’s networking environment. And for better network performance, the existing bandwidth has been generated to 40Gbps. Among various network devices designed for 40 Gigabit Ethernet (GbE) links, 40G QSFP+ transceiver are of vital importance in driving the bandwidth to a mounting point. Here this publication puts its focus on the Juniper 40G QSFP+ transceiver, which ensure high density and low latency, as well as small power consumption.

Firstly let’s figure out what is the 40G QSFP+ transceiver.

What Is 40G QSFP+ Transceiver?

The Quad Small Form-factor Pluggable (QSFP) is a compact, hot-pluggable transceiver used for data communications applications. The 40G QSFP+ transceiver is a parallel fiber optical module, using four independent optical transmit and receive channels. It uses a 4 x 10Gb/s link configuration for a 40Gb/s port, offering users high-density 40 Gigabit Ethernet connectivity options for high-performance networks. QSFP+ transceivers can be applied in switches, routers and data center applications. Compared with SFP+ transceivers, QSFP+ transceiver increase the port-density by 3x-4x. Besides, they still enjoy the following features.

Juniper 40G QSFP+ Transceiver Features

Juniper QSFP+ is a Multi-Source Agreement (MSA) for high speed application, such as 40G-BASE, which provide four channels of data in one pluggable interface. Each channel is capable of transferring data at 10Gbps and supports a total of 40Gbps. Juniper 40G QSFP+ transceiver enjoy the following listed key features:

  • QSFP+ MSA, SFF-8436 Compatible;
  • Four Independently Addressable Transmit and Receive Channels;
  • Highly Compact and Electrically Hot-pluggable;
  • Digital Diagnostic Monitoring (DDM) Interface for Better Module Management;
  • Simplified Heat Management With Reduction in Power Consumption;
Two Type of Juniper 40G QSFP+ Transceiver

After discussion on several key features of Juniper 40G QSFP+ transceivers in general, here goes the detailed information about two types of Juniper 40G QSFP+ transceivers: Juniper 40G QSFP+ LX4 transceiver and Juniper 40G QSFP+ LR4 transceiver.

JNP QSFP 40G lx4 Transceiver

The jnp qsfp 40g lx4 transceiver has four 10 Gbps channels, each of which can transmit and receive simultaneously on four wavelengths over a multi-mode fiber (MMF) strand. The result is an aggregated duplex 40 Gbps link over a duplex of two MMF strands. Using duplex LC connectors, QSFP+ LX4 connections can reach 100 meters on OM3 MMF or 150 meters on OM4 MMF. What’s more, this Juniper QSFP+ LX4 transceiver (JNP-QSFP-40G-LX4) addresses the challenges of fiber infrastructure by providing the ability to transmit full-duplex 40Gbps traffic over one duplex MMF cable with LC connectors. In other words, the Juniper QSFP+ LX4 transceiver, a short-reach optical transceiver that delivers 40Gbps over duplex OM3 or OM4 MMF, allows 40Gbps connectivity to connect directly to the 10Gbps fiber and fiber trunk.

Juniper 40G QSFP+ LR4 Transceiver

For Juniper 40G QSFP+ LR4 transceiver, JNP-QSFP-40G-LR4 enables high speed 4 x 10G operations. It’s designed for use in 40 Gigabit Ethernet links over single mode fiber (SMF) with Duplex LC connectors. Compliant with the QSFP+ MSA and IEEE 802.3ba, JNP-QSFP-40G-LR4 is RoHS-6 compliant with built-in DDM interface. Fiberstore compatible Juniper JNP-QSFP-40G-LR4 is intended to support up to 10km over a standard pair of G.652 SMF.

Juniper 40G QSFP+ Transceivers Applications

The Juniper 40G QSFP+ transceivers are well suited for Infiniband, 40GBASE-SR4, 40GBASE-LR4 applications, suitable for short reaches among switches, routers and data center devices. Combined with right fanout cables, these modules can interface up to four SFP+ transceivers.


Juniper 40G QSFP+ transceiver boast of high-density features and provide users with 40Gbps connectivity for better network performances. Fiberstore supplies various Juniper 40G QSFP+ transceiver which are quality and performance assured, such as JNP-QSFP-40G-LX4 and JNP-QSFP-40G-LR4 mentioned above. Please feel free to contact us for more information about Fiberstore 40G QSFP+ transceiver compatible with Juniper.