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Mollifying ISDN delivery dilemmas. (Integrated Services Digital Network)
New switches let LECs fulfill their ISDN promises and fuel competitive fires.
Ubiquitos ISDN could become a reality, thanks to a new line of "ISDN only" switches introduced by Madge Networks Inc. (San Jose, Calif.) last month at Supercomm'97. The ESN 1000 and ESN 2000 edge-switching nodes act as ISDN front ends for central office (CO) switches that are not equipped with ISDN software.
For customers served by non-ISDN CO switches or located where demand for the service has not been high enough to justify the cost of deployment, carriers traditionally have had to provide ISDN by backhauling service via T1 trunks from the nearest ISDN-equipped CO.
Upgrading a Class 5 CO switch to support Integrated Services Digital Network capabilities costs about $500,000 - an expense that usually can be justified only at large serving offices with demand for 250 or more basic rate interface (BRI) lines, explains Ron Nash, director of product marketing at Madge …
