Pros and con of fiber-to-the-desk

Sept. 1, 1997
Q: I attended the "Do we need zone cabling?" panel discussion at the bicsi conference in June. I left with the message that individual 4-pair drops were a better design choice than a 25-pair Category 5 cable. Comments?

4-pair vs. 25-pair cabling

Q: I attended the "Do we need zone cabling?" panel discussion at the bicsi conference in June. I left with the message that individual 4-pair drops were a better design choice than a 25-pair Category 5 cable. Comments?

Ross Bedbrook, RCDD

Bell Canada

Moose Creek, ON, Canada

A: Ah, yes, as moderator of that session, I remember it well. Brian Moffitt of Lucent Technologies presented a slide depicting a "600-Pair Consolidation Point," which George Weller of Steelcase later described as a "King Kong" consolidation point. amp`s Ken Hall concluded that "bicsi should drive zone cabling practices to ensure [that they are] designed and installed properly." Terry Cobb of Datacom Technologies explained that in a 4-pair cable, near-end crosstalk is measured from pair to pair, but in a 25-pair cable, near-end crosstalk is measured using a power-sum technique. Bob Jensen of dbi then reminded the group that there are no 25-pair connectors recognized in the tia/eia-568a standard; no field-test instruments available to test power-sum near-end crosstalk on 25 pair-cable; and no cabling install-ation requirements provided on how to break out the 25-pair into 4-pair bundles while minimizing crosstalk.

As for me, I am sticking to my closing statement at the session: "It sounds as if we still have some work to do on this one."

Donna Ballast is a communications analyst at the University of Texas

at Austin and a bicsi registered communications distribution designer (rcdd). Questions can be sent to her at Cabling Installation & Maintenance or at PO Drawer 7580, University of Texas, Austin, TX 78713; tel: (512) 471-0112, fax: (512) 471-8883, e-mail: [email protected].

Sponsored Recommendations

Cat 6A Frequently Asked Questions

April 29, 2024
At CommScope we know about network change and the importance of getting it right. Conclusion Category 6A cabling and connectivity.

Revolutionize Your Network with Propel Fiber Modules

Oct. 24, 2023
Four sizes of interchangeable Propel fiber modules provide the breadth of capabilities for virtually any configuration.

Elevate Your Network with Propel High-Density Panels

Oct. 24, 2023
Propel Series Sliding Fiber Optic Panels

Constellation™ - Explore power and data products

Oct. 24, 2023
Discover the Essentials for Building Your Power and Data System!