The jacks commonly used in patch panels in the U.S. conform to Western Electric standard dimensions. The number of insertion cycles a jack can endure should be rated in the tens of thousands. The factors affecting the life and reliablility of a jack include contact wear and failure of the termination switch. Descirable features include the following:

● Contacts fully isolated from the panel.
● Sealed metal housing to keep out contaminants and provide EMI protection.
● Easy replacement from the front of the panel.
● Low VSWR (below 600 MHz)
● High signal isolation (40 dB)
● 75 Ω characteristic impedance.
● Wide designation strips, making it easier to label the field and to allow more flexibility in selecting names that will fit on the lables.

If a patch cable is inserted in the signal path of a timed video system, it will delay the signal by an amount determined by its length and physical properties. The patch thereby alters the timing of the signal path. This can be avoided by using phase-matched normal-through fiber patch panels. The design of these patch panels anticipates the delay caused by a fixed length of Fiber Optic Jumpers by including that length in the loop-through circuit.

With phase-matched panels, the normaling connection in each connector module includes a length of cable that provides a fixed delay through the panel, usually 3 ft (0.914m). If a patch cord of the same length as the internal cable is used to make connections between patch points, the delay will be the same as that of the normal-through panel. When a fiber optic patch cord is plugged in, it is substituted for the loop cable through the swiching mechanism normally used in normalled patch conncetors. Thus, critical timing relationships can be maintained. Figure 6.21 shows a phase-matched patch panel.

In a normal uncompensated fiber patch panel, when a cable is used to patch between two points on the panel, the length of the patch cord is added to that of the cables connected to the patch. The additional cable length delays the signal by approximately 1.52 ns/ft (5 ns/m). To avoid the delay probles associated with conventional patch panels, phase-matched normal-through video patch panels should be used.

If phase-matched patch panels are used, all of the patch cord must be the same length as the delay built into the patch panel. Obviously, if all of the patch cords must be the same short length for the phase-matched panel, it would not be possible to patch between panels that are separated by a longer distance than the cord can reach. This limitation should be considered when laying out patch panels in a rack.

Color-coded cables can be specified. When different-length patch cords are specified, different colors can be used to distinguish one length from another.

Fiberstore specializes in fiber optic patch cable assemblies and fiber optic network devices manufacturing since 1995, we are known as the fiber optic cable manufacturer for the excellent products quality, competitive prices, fast delivery and good service. We not only offer OEM fiber optic patch cord assemblies to some world leading companies in this industry, but we also cooperate with many other companies from all over the world and support these partners to win in the market.

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An optical fiber connector terminates the end of an optical fiber. A variety of optical fiber connectors are available. The main differences among the types of connectors are dimensions and methods of mechanical coupling. Generally, organizations standardize on one kind of connector, depending on the equipment that they commonly use, or they standardize per type of fiber (one for MMF, one for SMF). Taking into account all the generations of connectors, about 70 connector types are in use today.

As shown Figure 4-12, the most popular network fiber-optic connectors inclued

● Straight-tip (ST): An older bayonet style connector widely used with multimode fiber, as well as single-mode.

● Subscriber connector (SC): Sometimes referred to as square connector or standard connector. It is a widely adopted LAN and WAN connector that uses a push-pull mechanism to ensure positve insertion. This connector type is used with multimode and single-mode fiber.

● Lucent connector (LC): Sometimes called a little or local connector, it is quickly growing in popularity because of its smaller size. It is used with single-mode fiber and also supports multimode fiber.

Because light typically only travels in one direction over optical fiber, two fibers are usually required to support full-duplex operation. Therefore, fiber-optic patch cables bundle together two optical fiber cables and terminate them with a pair of standard single fiber connectors. Some fiber connectors accept both the transmitting and receiving fibers in a single connector known as a duplex connector, also shown in Figure 4-12.

Fiber Optic Patch Cables are required for interconnecting infrastructure devices. Some of the common Fiber Optic Patch Cord are

● SC-SC multimode patch cord
● LC-LC single-mode patch cord
● ST-LC multimode patch cord
● SC-ST single-mode patch cord

LC LC fiber optic cable from Fiberstore

● LC-LC Connectors
● Multimode Duplex fiber optic cable
● Micron: 62.5/125um
● Complete with Lucent Technologies aqua jacket
● Bandwidth transmitting rates up to 10 gigabits
● All of our fiber optic patch cables feature the high degree connectors
● Fiber class: OM1
● Color: Orange

Fiber cables should be protected with a small plastic cap when not in use. The color of the fiber jacket is often used to distinguish between single-mode and multimode fiber patch cables. This is because of the TIA-598 standard, which recommends the use of yellow jacket for single-mdoe fiber cables and orange (or aqua) for multimode fiber cables.

Fiberstore provide various types of fiber patch cords including single mode, multimode, multi core, and armored versions. You can aslo find fiber optic pigtails and other special patch cables here. For most of them, the SC, ST, FC, LC, MU, MTRJ, E2000, APC/UPC connectors are all available, even we supply MPO/MTP fiber cables.

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