100G QSFP28 Cables Types You Must Know About

Two types of QSFP28 cables are available: one is a high-speed cable with QSFP28 connectors on either end that can send and receive 100Gbps data over a thin twinax cable or a fiber optic cable, and the other is a breakout cable that can divide a single 100G signal into four 25G or two 50G signals (QSFP28 to SFP28). This allows network devices with different speed ports to be connected while utilizing all available port bandwidth.

 

Many 100G passive DAC types

The two main types of 100G DAC cables are 100G Active DAC and 100G Passive DAC. Additionally, there are three different types of 100G passive DAC: 100G QSFP28 to 100G QSFP28 Passive DAC, 100G QSFP28 to 4 25G SFP28 Passive DAC, and 100G QSFP28 to 2x 50G QSFP28 Passive DAC.

 

Passive DAC 100G QSFP28 to 100G QSFP28

A 4-channel parallel passive copper connection called the 100G QSFP28 to 100G QSFP cable, integrates four 28 Gbps SFP channels into a single high-density cable. It provides a cost-effective method of establishing a 100-Gigabit link between QSFP-100G ports of switches within racks and across adjacent racks, making it ideal for data centers, high-end servers, and enterprise wiring closets. It offers 4 independent data transmitting channels and 4 independent data receiving channels via copper cable.

 

4x 25G SFP28 passive DAC cables, 100G QSFP28

A breakout cable called a 100G QSFP28 to SFP28 Passive DAC Cable offers a hybrid transition from four separate SFP28s at one end to a QSFP28 at the other. It provides four parallel, bi-directional channels, each with a maximum 25Gbps speed. The 100G to 25G breakout cable satisfies the rising need for increased channel densities with high-level signal integrity in high-performance computing, top-of-rack switching, and network storage installations thanks to its minimal crosstalk, short bend radius, and low power consumption.

 

2x 50G QSFP28 passive direct attach cables, 100G QSFP28

A 4-channel parallel copper direct attach cable that offers 4 separate data transmission channels and 4 independent data receiving channels is known as a 100G QSFP28 to 2x 50G QSFP28 breakout DAC. This gadget can transmit data at a total rate of 100Gbps across a 5m distance. This QSFP28 cable is appropriate for the Infiniband EDR and 128G Fiber Channel and was created for usage in a cost-effective 100GbE to 2 x 50GbE Ethernet connection solutions to fulfill the rising requirements for increased bandwidth in data centers.

Follow our Facebook and Twitter for more information about our product.

Tips to select an optical fiber link and an SFP module

We visualize kilometers of optical fiber networks connecting highly remote locations when we come across a notion of fiber optics or optical fiber links like SFP cable. And, many questions arise when it comes to building a network:

• What is the distance between SFP modules?
• Difference between a single-mode and a multi-mode cable?
• Which type of cables suits an SFP module?
• Which type of fiber optics to select?

The major benefits of optical fiber networks include high interference immunity, protection against unauthorized access, and an increase in transmission distance.

The principle behind it is based on the light that is used for the signal transmission. At the connection boundary of the DAC cable, the light is transferred through the core made from a special polymer with transceivers.

Within a type of optical fiber, the main difference between various SFP modules lies. That is the reason why while selecting a module, it is required to decide on a fiber optics type first.

Single-Mode optical modules

They are mainly used with a single-mode (SM) cable, typically, of 9/125 standard. Here there is the use of another technology, the laser is used as a light source, and radiation spreads along with the optical fiber in one mode, so that the data transmission distance reaches 120 km.

With a WDM technology, there also exist SFP modules, in which the signal receipt and delivery are done through a single core (using one connector), but at different wavelengths. While building networks this either reduces the number of cores or saves money in projects where the number of cores is limited by the budget. In this technology, there is the use of only a single-mode optical fiber. For organizing a connection, there is the use of two paired modules with each having different (opposite) wavelengths of a receiver or a transmitter.

Multi-mode optical modules

They are specifically designed for application with a multi-mode (MM) cable or AOC cable, typically of 50/125(ОМ2) standard or 62,5/125 standard. Modules provide support to data transmission at a rate of up to 10 Gb on waves with a thickness of 850 nm or 1320 nm. For data transmission, the energy of light is used and a light-emitting diode serves as a source. Several radiation modes spread along with the optical fiber, each at its unique angle. The main disadvantage is that there is a data transmission distance of up to 550 meters.

Few Facts about optical switching

In telecommunications switching is necessary, but few times it can be confusing as it operates at two distinct levels. Many big, expensive boxes called switches are included in the telephone network, which consists of dedicated special-purpose computers so that they can direct the operation of small components called an optical switch. The big box is the switch to a network engineer, but a switch is a component inside the big box to an optical engineer. Optical switching can be performed by both the big box and the component, but sophisticated electronic control systems are contained in the big box inevitably with the help of current technology.

If you see then in practice many optical switches are optoelectronic, with input optical signals converted to electronic form for switching, and the switched electronic signals are then driving an optical transmitter. In the light all-optical switches manipulate signals form and, by redirecting all signals in fiber, it can be done either by selecting signals at certain wavelengths in wavelength-division multiplexed (WDM) systems. You will find few switches that can isolate individual wavelengths, but typically their input is individual optical channels that are separated by demultiplexing optics. That indicates that they operate at the optical-channel level, without regard to what data stream the optical channel is carrying. To manipulate the data stream transmitted on each optical channel fiber adapter or optoelectronic switches are still required.

By an externally applied field or by some other external influence, optical transmission properties can be changed in an optic switch. For this purpose electric, magnetic, and surface acoustic wave techniques are used. By such means, from a detector light may be deflected away, thus switching the beam.

From one phone or computer to another when a fiber-optic network carries a light signal, it may be required to move the signal between different fiber paths. To perform this, a switch is needed that can transfer the signal with a minimum loss of voice or data quality. Future switching applications will need to push the technology further. True optical routers or optical amplifiers are one target that would direct the headers on Internet packets to their destinations.