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Archived — Cable Management

 

What is Zone Cabling and is it supported by standards?

Zone Cabling is a generic term that means different things to different people. To some, it means an “active consolidation point (CP)” or an “active Multi-User Telecommunications Outlets Assembly (MUTOA)” since the CP and MUTOA are covered in the “zone” clauses of the Pathways & Spaces Standard, TIA-569B. However, active devices in the “zone” are beyond the scope of TIA-568B, Commercial Building Cabling.

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Is OTDR testing necessary for premise cabling?

While there has been some “buzz” about Optical Time Domain Reflectometer(OTDR)testing for premises cabling since the publication of TSB-140, Additional Guidelines for Field-Testing Length, Loss and Polarity of Optical Fiber Cabling Systems, many agree that the test is usually not necessary for the relatively short links found in a customer-owned network, and may merely add unnecessary expense and complexity. When testing an optical premises network, the key measurement criterion is insertion loss, or attenuation. This is effectively measured by using a power meter and light source. If the attenuation is within the limits of the allotted power budget, the system

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I’ve read about the new 50-micron laser optimized multimode fiber. When should I specify that instead of standard 50-micron or 62.5 micron fiber?

Companies that are installing fiber today should consider the new 50-micron laser-optimized multimode fiber as it will fully support 10 Mbps or 100 Mb/s legacy applications as well as provide 1 and 10 Gb/s future-proofing. In addition, laser optimized 50-micron multimode fiber supports low-cost multimode opto-electronics and low-cost, easy-to-install connectors. However, if your company already has 62.5 micron or standard 50-micron installed in its network there’s no need to panic — or to pull out the fiber and recable. Both of these fiber types offer the ability to support application up to Gigabit levels and are likely to meet your

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Fiber Duct Utilization

What is the recommended fill ratio for pulling long lengths of fiber cables through duct or conduit? The simple answer: Less than 50% fill ratio by cross-sectional area is recommended. Multiple fiber optic cables can be pulled all together. The only requirement is to apply tensile load equally to all fiber cables. Especially for difficult fiber optic cable pulls, putting in extra fibers for later termination is the most cost-effective way for future bandwidth expansion.

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How much pulling force for fiber optic cable and copper cable?

Almost all fiber optic cable has a maximum pulling force of 50 lbs., and some types of fiber optic cable are rated for pulling force up to 200 lbs. or more. The maximum rating for four-pair UTP copper cable is only 25 lbs. That’s because excessive pulling force can easily take the twist out of the copper pairs and create cross talk.

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