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Fiber Transport System Modular Panel-mount Connectivity7/7/2014

The most obvious benefit of the structured trunking system is the large reduction in the number of fiber optic cables under the raised floor. The smaller number of cables makes documenting what cables go where much easier. Better documentation means that tracing a fiber-optic link is much easier during problem determination and when planning for futrue growth.

A less apparent and often overlooked benefit of a structured system is its ability to make future data center growth implementation much easier. With a structured system installed, channels, and control unit I/O ports are connecte by MTP Trunk Cable to patch panels in the CPL. All the connetions between the equipment are made with short jumper cables between the patch panels in the CPL. When new equipment arrives. It is connected to patch pannels in the CPL also. Then, the actual reconfiguration takes place in the CPL by moving short jumper cables between the patch panels, not by moving long jumper cables under the raised floor.

The first FTS implementation solution is called modular panel-mount connectivity. This uses MPO TO MPO Cable to connect to the CPL.

The modular panel-mount boxes are designed so that you can changes the port type in the panel-mount box by unplugging the trunk and changing the modular inserts in the box.


* MTP-to-MTP trunks connect quickly to the panel-mount box.
* The connector type in front of the panel-mount can be easily changed.
* Panel mount capacity can be customized.

The second FTS implementation solution is called coupler plates connetivity. It uses MTP-LC duplex trunk cables to connect to the CPL.

The LC duplex small from factor optical connector is the standard for FTS connectivity, eliminating the need for multiple connector types at patch panels and for patch cables. By standardizing on a connector with a proven history of reliability, the different optical fiber connectors used in equipment do not create a management problem when a system configuration used in equipment do not create a management problem when a system configuration must change. The LC-duplex supports termination of both sizes of multimode fiber and single mode fiber. As a result, CPL patch panel connections and patch cables are easily mangaged and differentiated by their color. There are two key benefits:

* CPC port order at the panel mount is independent of the harness that plugs in at the CPC.
* Single connector type at the CPL

The MTP coupler brackets provide the mechanical support to connect the harness MTP connectors to the MPO Connector. They are directly mounted on CPC frames.

The maximum density of fiber trunk cables is 144 fiber, which use 12 Fiber MTP connectors on the CPC trunk cable end. The Trunk cables run under the raised floor and connect the harnesses in the CPC to the panel-mount box in the Central Patching Location.

Fiberstore manufactures and distributes a wide range of MTP MPO products including single mode or multimode MPO and MTP fiber cable, MPO Fiber Cassette and MTP Cassettes.High density MTP/MPO trunk cables with up to 288 fibers in a single cable. Fiberstore provides a very supportive customer service program for our clients when using our wide selection of products.

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Signal Crossover in Fiber Optic Systems With MPO Cables4/7/2014

Ribbon cables terminated with MPO connetors present some challenges when it comes to maintaining the correct signal crosssover in a segment consisting of multipe fiber optic srands. The ANSI/TIA-568-C.3 standard provies a set of "Guidelines for Maintaing Polarity Using Array Connetors" that decribe three types of MPO-to-MPO array cables, defined as Types A, B, and C. These cables are used to provide three different methods for maintaining a crossover connection. Method A is prefferred method, and is based on Type A MPO Fiber cables.

Figure 17-6 shows a Type A straight through ribbon cable with 12 fibers terminated in MPO connetor. A Method A backbone link is cabled "straight through", terminating in the cabling system patch panel. One end of the link will have a straight through patch cable, connetion from the patch panel to the Ethernet interface. The other end of the link will have a crossover cable connecting to the Ethernet interface. The guidelines recommend keeping all of the crossover patch cables at one end of the link, to keep the system as simple as possible and help the installer to avoid connecting the wrong type of patch cale.

MPO Fiber

The guidelines also show Method B and Method C, which are two methods for providing a crossover patch built into the MPO backbone cables themselves. Given the complexity of these approaches and the difficulty of implementing them correctly, they are both rarely used.

As you can see, there are a variety of approaches to managing the signal crossover for the 12-fiber and 24-fiber systems needed to support 40 and 100 Gb/s Ethernet. For the best results, make sure you know which method your site is using in the cabling system, and order the correct MPO cable types to make the connections and achieve the signal crossover. Note that some vendors provide special MPO connectors that make it possible to change connector gender and polarity(crossover) in the field, which coulde be a handy way to resolve MPO-to-MPO connectivity issues.

To provide an introduction and basic information to readers, this section begins with a presentation of the components needed for a parallel optical MPO connection.

MPO connectors contact up to 24 fibers in a single connection. A connection must be stable and its ends correctly aligned. These aspects are essential for achieving the required transmission parameters. A defec-tive connection may even damage components and or cause the link to fail altogether.

MPO cables are delivered already terminated. This approach requires greater care in planning in advance but has a number of advantages: shorter installation times, tested and guaranteed quality and greater reli-ability.

Fiber trunk cables serve as a permanent link connecting the MPO modules to each other. Trunk cables are available with 12, 24, 48 and 72 fibers. Their ends are terminated with the customer's choice of 12-fiber or 24-fiber MPO connectors.

trunk fiber optic cables

Harness cables provide a transition from multi-fiber cables to individual fibers or duplex connectors.The 12-fiber harness cables available from R&M are terminated with male or female connectors on the MPO side, the whips are available with LC or SC connectors.

Harness cable

Fiberstore supply MTP MPO fiber cables, MTP Cassette and MPO Cassette. MTP MPO cables are available in 4,8,12, 24, and 48 fiber array configurations. Many additional options and combinations are available. All fiber optic cables are customizable

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