Telephony

ADM's Eve.(Add/drop multiplexers )

Byline: Ed Gubbins

Add/drop multiplexers have been a building block of the nation's telecom network for years, dutifully marshalling Sonet traffic in untold numbers. But with the rise of next-generation multi-service provisioning platforms, ADMs are slowly and steadily being put out to pasture, and the vital work they do will soon be performed by individual microchips.

Measured in sales of new equipment, next-generation MSPPs seem to have spread like wildfire, rising from zero to about 42% of global metro optical equipment sales in just a few years, according to Infonetics Research. Sales of legacy Sonet metro networking equipment are declining fast, and worldwide sales will essentially fade out by 2007. As components in live networks, however, the ADM-to-MSPP migration appears much more gradual.

When Grand River Mutual, an independent operating company with about 26,000 access lines in Missouri and Iowa, outgrew the OC-12 backbone in the eastern part of its network, the company decided to replace it with an OC-48. To enable the change, GRM narrowed its choice of system vendors to three leading candidates: Nortel Networks, Cisco Systems and lesser-known vendor Turin Networks. …

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