Why use T1 lines?

A: The cable impedance is 100 ohms plus or minus15 ohms, and the maximum distance is less than 6000 feet between repeaters. Check with your local access provider for the exact distance they will support from the demarcation point. It is usually 600 feet.

Q: What is the impedance on shielded T1 cable and the maximum distance?

James Rauser

Basin Electric Power Coop

Bismarck, ND

A: The cable impedance is 100 ohms plus or minus15 ohms, and the maximum distance is less than 6000 feet between repeaters. Check with your local access provider for the exact distance they will support from the demarcation point. It is usually 600 feet.

In addition to the significant cost savings, T1 1.554-megabit-per-second services provide other benefits, including increased bandwidth (in lan-to-lan connections), digital performance, expansion capabilities, and the flexibility to use existing capital equipment (see "Realizing savings with T1," page 10).

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, the University of Texas, Austin, TX 78713; tel: (512) 471-0112, fax: (512) 471-8883, e-mail: ballast@utexas.edu.

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