To: KYA27 who wrote (8018 ) 6/2/1999 6:21:00 PM From: bill c. Respond to of 21876
[ LU/USWest/5ESS/7RE/ASND ]....The fact that most service providers are already deploying ATM in their backbones means that ATM will be part of the PSTN for years to come. Once you put it in, it takes years to get it all out. A stunning example of this truth is that US West (Denver) recently bought 41 Lucent 5ESS Class 5 voice switches to replace aging analog switches that are still running in its network. "Ten years ago, we all talked about how SNA [simple network architecture] would be dead in two years," says Mitch Auster, PathStar technical marketing manager at Lucent. "Things don't go away fast, especially things that are expensive to deploy." US West bought the Class 5 switches despite the fact that all kinds of new, alternative hybrid packet/circuit switches are being touted by venture capital-funded companies out to render Class 4 and 5 switches obsolete. The regional Bell operating company's (RBOC's) decision was likely influenced by the fact that Lucent and Nortel have introduced strategies for evolving the thousands of existing Class 4s and 5s that are installed in the network so they can handle packet and circuit-switched traffic simultaneously. Nortel's Succession product and Lucent's recently introduced R/Evolutionary Networking portfolio will further entrench the embedded network. US LEC (Charlotte, N.C.) will use the 7R/E Packet Driver to interface with its planed ATM network. Wireless provider Omnitel and competitive local exchange carrier (CLEC) e.spire (Annapolis Junction, Md.) have announced plans to use this device to evolve their 5ESS switches to provide voice and data services over ATM networks. The 7 R/E Packet Driver converts calls from circuit format into packets. The 7 R/E device could be used to support IP-only transmissions across a network consisting of a single vendor's IP switches, such as the PacketStar 6400, Auster says. "But once traffic gets out into the Internet or starts on one vendor's network and terminates on another's, QoS supported by Lucent's HWFQ algorithm is lost and you are back to the only standard, multivendor way to get QoS — and that is ATM," Auster says. "IP-only solutions are available today, but it is a matter of when multiple vendors implement the same interpretation of them. It's going to take time." "My best guess is three to five years," Lynch adds. "We clearly believe there is a lot of life left in ATM, that's why we bought Ascend." americasnetwork.com