Tag Archives: MTP cassettes

Unveil Polarity of MTP/MPO Multi-Fiber Cable Solutions


With widespread deployment of 40G and 100G networks, high-density MTP/MPO cable solutions are also become more and more popular. Unlike traditional 2‐fiber configurations LC or SC patch cords, with one send and one receive, 40G & 100G Ethernet implementations over multimode fibers use multiple parallel 10G connections that are aggregated. 40G uses four 10G fibers to send and four 10G fibers to receive, while 100G uses ten 10G fibers in each direction. MTP/MPO cable can hold 12 or 24 fibers in a connector, which greatly facilitates the upgrade to 40G and 100G networks. However, since there are so many fibers, the polarity management of the MTP/MPO cable may be a problem.

Structure of MTP/MPO Connectors
Before explaining the polarity, it is important to learn about the structure of MTP/MPO connector first. Each MTP connector has a key on one side of the connector body. When the key sits on top, this is referred to as the key up position. In this orientation, each of the fiber holes in the connector is numbered in sequence from left to right. We will refer to these connector holes as positions, or P1, P2, etc. Each connector is additionally marked with a white dot on the connector body to designate the position 1 side of the connector when it is plugged in.


Structure of MTP/MPO Adapters
Since the MTP connectors can either key up and key down, there are two types of MPO adapters.

  • Type A: Key-up to key-down

Here the key is up on one side and down on the other. The two connectors are connected turned 180° in relation to each other.

  • Type B: Key-up to key-up

Both keys are up. The two connectors are connected while in the same position in relation to each other.


Two Polarity of Traditional Duplex Patch Cable
Classic duplex cables are available in a cross-over version (A-to-A) or a straight-through version (A-to-B) and are terminated with LC or SC connectors. Telecommunications Cabling Standard defines the A-B polarity scenario for discrete duplex patch cords, with the premise that transmit (Tx) should always go to receive (Rx) — or “A” should always connect to “B”. Therefore, A-B polarity duplex is very common in applications.


Three Polarity of MTP/MPO Multi-Fiber Cable
Unlike traditional duplex patch cables, there are three polarity for MTP/MPO cables: polarity A, polarity B and polarity C.

  • Polarity A

Polarity A MTP cables use a key up, key down design. Therefore, as shown in the figure below, the position 1 of one connector is corresponding to the position 1 of another connector. There is no polarity flip. Therefore, when we use polarity A MTP cable for connection, we must use A-B duplex patch cables on one end and A-A duplex patch cables on the other end. Since in this link, Rx1 must connect to Tx1. If we don’t use A-A duplex patch cable, according to the design principle of polarity A MTP cable, fiber 1 may transmit to fiber 1, that is to say Rx1 may transmit to Rx1, which may cause errors.


  • Polarity B

Polarity B MTP cables use a key up, key up design. Therefore, as shown in the figure below, the position 1 of one connector is corresponding to the position 12 of another connector. Therefore, when we use polarity B MTP cable for connection, we should use a A-B duplex patch cables on both ends. Since the key up to key up design help to flip the polarity, which makes fiber 1 transmit to fiber 12, that is the Rx1 transmits to Tx1.


  • Polarity C

Like the polarity A MTP cables, polarity C MTP cables also use a key up, key down design. However, within in the cable, there is a fiber cross design, which makes the position 1 of one connector is corresponding to the position 2 of another connector. As shown in the figure below, when we use polarity C MTP cable for connection, we should use a A-B duplex patch cables on both ends. Since the cross fiber design help to flip the polarity, which makes fiber 1 transmit to fiber 2, that is the Rx1 transmits to Tx1.


Different polarity MTP cables may have different connection methods. No matter which type cable you choose, remember its design principle and choose the right cabling infrastructure for your network. FS.COM provides a full range of MTP cables and MTP cassettes,  polarity A, B and C are all available.

Fiberstore MTP Product Specifications


Multi-fiber technology is has exploded as a result of today’s high fiber counts and limited space requirements which Data Centers demand. Fiberstore is today’s leader in the manufacturing of MTP cables and MTP Cassette. Fiberstore engineers unique MTP solutions utilizing 12, 24, 48 and even 72 fiber MTP ferrules. Now the following is the feature and benefits of MTP cassettes and cable assemblies.

MTP cassettes and cable assemblies take their name from the MTP MPO connector, designed and introduced as a performance version of MPO connectors. MTP fiber systems are truly an innovative group of products. Each MTP connector contains 12 fibers or 6 duplex channels in a connector that is smaller than most duplex connections in use today. A 72 fiber trunk cable can be terminated with six MTP connectors and MTP connectors are manufactured specifically for multifiber loose tube or ribbon cable.

MTP connectors allow high-density connections between network equipment in telecommunication rooms. They use a simple push-pull latching mechanism for easy and intuitive insertion and removal. The ends of MTP brand connectors may be polished flat or at an 8° angle. An MTP brand connector is about the same size as a SC connector however it can accommodate 12 fibers, which provides up to 12 times the density, thereby requiring much less card and rack space.

MTP Cable

A standard MTP cassette has one port in the back with a MTP coupler awaiting connection of an MTP cable assembly that has 12 fibers in the connector. The MTP cable plugs into the back and through the adaptor. The cable connects to another MTP assembly inside the cassette that “fans out” to 12 SC or LC connections. One MTP cable can connect up 12 different ports. From there you simply plug in your patch cables.


* Suitable for high-density switch to patching and distribution in Data Center Applications (based on 72 fiber MTP ferrule)
* Used in optical transmitters and receivers, MTP brand connectors offer up to 36 times the density of standard connectors, providing significant space and cost savings.
* Compact design addresses high fiber count applications, with small and lightweight cables ideal for use with installation space limitations.
* MTP brand cable trunks offer flexibility in changing the connector style in the patch panels. New cassettes can be installed with the new connector style on the cross-connect side of the patch panel without having to change the connector on the cable trunk.
* The MTP brand connector is the standard for delivery of 40G (in its 12 fiber version) and 100G (in either a duplexed 12 fiber cable or 24 fiber ferruled cable) using QSFP transceivers.

Multi-fiber technology will eventually replace the standards for fiber optics as we know it. Even now people are tearing out their existing infrastructure and placing MTP cassettes in their patch panels to route data for thousands of network electronics. MTP cassettes, cables, connectors and adapters are essential to backbone infrastructure. The high fiber count in one connector creates endless possibilities. Imagine a 1U rack mount patch panel that can supply data to run an entire 288-port switch. With today’s increasing demand for higher through-put, ST, SC, MTRJ, LC, FC, etc, will all be a thing of the past.

MTP Fiber Optic Cables are multi-fiber patch cords suitable for high-density back plane and PCB solutions. MTP patch cords offer up to 36 times the density (based on a 72 fiber ferrule) of traditional patch cords, providing significant space and cost savings. There are several configurations for MTP brand cable assemblies. The most popular is a MTP connector to MTP connector patch or trunk cable that connects an MTP brand cassette to another MTP brand cassette. If an MTP adapter panel is installed in a patch panel, then an MTP cable to MTP brand can be used as well.

Another configuration is MTP connectors to LC or SC fiber connector. These can be used in different applications for both back end and front end adapter panels, for instance, plug one MTP connector into the back and plug an MTP cable to LC cable into the front and have the 12 LC connections go to other equipment. If there is an MTP cassette that needs to be lit up by using a 12-fiber LC adapter panel, plug each of the 12 LC connections in the LC adapter panel. The MTP side then plugs into the back of the cassette. Increase the transfer speed with 10 Gig 50 Micron multimode cable or increase the distance the signal can travel using singlemode. Cables may be constructed of ribbon fiber, small form factor loose tube assembly cable, or subgrouped trunking cable. The options are only limited by the application.

MTP/MPO Cassettes are specially designed to reduce installation time and cost for an optical network infrastructure in the premises environment. MTP/MPO Cassettes provide secure transition between MTP/MPO and SC, LC, ST, or FC connectors. They are used to interconnect MTP/MPO backbones with LC/SC/ST/FC patching. Fiberstore MTP cassettes come in a variety of connector styles and modes. From Multimode to Singlemode, from SC to LC, MTP brand solutions can be the solution to save space, time, and energy.

MTP Trunk Cable

By plugging an MTP brand cable into the back, 12 or 24 (with quad LC) connections are being lit up . For the 24-fiber application, either one 24-fiber MTP brand cable or two 12-fiber MTP brand cables can be used. The cassette can be snapped into any standard fiber optic patch panel including both rack mount and wall mount. A RAC-1X holds three of these cassettes which could potentially contain 72 active LC connections using only three (or six) MTP brand cables. Clean up the clutter and increase your possibilities using MTP brand cassettes.

We supply MPO/MTP fiber optic cables, such as MPO MTP trunk cable, MPO/MTP breakout cable. These are available in Female to female or a male to male and male to female configurations. The male version has MTP pins. These can be made with 12 fiber MTP connectors, 24 Fiber MTP connectors, 48 Fiber MTP connector variations. We use USConec MTP fiber optic connectors for all of our MTP and MPO terminations so that the highest performance is accomplished. Many additional options and combinations are available. All multi fiber optic cables are customizable.