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Private Line covers what has occurred, is occurring, and will ocurr in telecommunications. Since communication technology constantly changes, you can expect new content posted regularly.

Consider this site an authoritative resource. Its moderators have successful careers in the telecommunications industry. Utilize the content and send comments. As a site about communicating, conversation is encouraged.

Writers

Thomas Farely

Tom has produced privateline.com since 1995. He is now a freelance technology writer who contributes regularly to the site.

His knowledge of telecommunications has served, most notably, the American Heritage Invention and Technology Magazine and The History Channel.
His interview on Alexander Graham Bell will air on the History Channel the end of 2006.

Ken Schmidt

Ken is a licensed attorney who has worked in the tower industry for seven years. He has managed the development of broadcast towers nationwide and developed and built cell towers.

He has been quoted in newspapers and magazines on issues regarding cell towers and has spoke at industry and non-industry conferences on cell tower related issues.

He is recognized as an expert on cell tower leases and due diligence processes for tower acquisitions.

« Advice for grads | | More musings on hiring in the wireless trade »

May 22, 2004

Posted by Tom Farley & Mark van der Hoek at 12:14 AM

Switchroom layout

Q. Do you have a photograph of a modern central office switchroom?

A. No. How about a diagram instead? The Nortel DMS-100 SuperNode is an older design but still the most widely used telephone switching system in North America. I can't explain all the acronyms but here are some of them:

I0E: Input/Output equipment frame, containing a tape drive, frame supervisory panel, disk drive, and an input/output controller.

LCE: Line concentrating equipment. LCE frame contain line concentrating modules which in turn house line cards.

MAP: Maintenance and Administration Position

PM: Peripheral Module. The interface between the switch and the outside world. All PMs terminate customer lines.

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