Message-ID: <28493495.1075842462305.JavaMail.evans@thyme> Date: Fri, 27 Oct 2000 02:31:00 -0700 (PDT) From: mnewsletter@mtlnh.com To: dfossum@enron.com Subject: Surge Protection for Telephone Modems Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-From: MTL NewsLetter X-To: dfossum@enron.com X-cc: X-bcc: X-Folder: \Drew_Fossum_Dec2000_June2001_1\Notes Folders\Discussion threads X-Origin: FOSSUM-D X-FileName: dfossum.nsf If you have missed any of the Newsletters on IS Barriers in Div 2, Zener Barriers, Ground Monitoring Systems, Surge Protection, Process I/O, Rotational Speed Application, or Intrinsically Safe Pneumatic Valves, please click your reply button and note same. Surge Protection for Telephone Modems The proliferation of modems in electronic equipment is widespread today and makes them susceptible to damage by surges. The cause of this damage is the potential voltage difference between the ground at the modem and the ground at the telephone exchange. When protecting telephone modems from surges, it is important to note that the Telephone Company provides a gas discharge tube at its demarcation point to protect the user from being shocked. Since a gas discharge tube does not fire until the voltage exceeds 700 Volts, the potential voltage difference is already 700 Volts. Added to that amount is the increase of voltage difference that results from a ground wire length of at least 3 feet, and thus the potential voltage difference before the discharge tube fires and the device being protected is closer to 1200 Volts -- enough power to destroy the device. MTL's solution is the ZB24501 surge suppressor, a DIN rail mount model with RJ45 connections. It is UL listed, is only available in connector fashion, and is easy to install -- the grounding connection is through the DIN rail. The price for this unit is an inexpensive $32.00 -- considering the business impact of damage to a modem, such a sum is money well spent. To find out more on how you can benefit from an MTL solution in a variety of applications, visit us at www.mtlnh.com, www.mtl-inst.com, and/or www.telematic.com. You may call MTL at (800) 835-7075 for the location of the MTL Representative nearest to you. To unsubscribe, please use your REPLY button and write "Unsubscribe" in the subject line.