![]() ![]() Speak to a specialist to get the details on Cisco Cloud Protection. Simplify complexity and make better decisions to secure your enterprise.This requires a mix of TDM and IP as the Rolm PBX is phased out and the HiPath phased in, says Elwyn Hull, telecommunications director at Southwestern Medical Center. The facility, which occupies a dozen buildings across a two-mile campus, is replacing an old Rolm 9000 PBX (Siemens bought Rolm from IBM in 1992). The University of Texas Southwestern Medical Center in Dallas runs a HiPath 4000. HiPath 4000 chassis also can be fitted with a back-up call-processor blade for an extra layer of redundancy. Calls would be temporarily routed and processed through the branch-office IP PBX until the main-site HiPath was brought back up. If the central-office HiPath 4000 is unavailable, centralized call control across the network can fail over to an AP 3700 in one of the branches. The HiPath 4000 and AP 3700s also can back up each other during hardware failures. This can let a HiPath 4000 switch trunk lines over to a TDM, or a back-up IP network if WAN congestion exceeds a user-determined level, or fails completely. The IP PBX also runs a quality-of-service monitoring function that measures latency across a WAN. The ComScendo software provides call control (via Siemens’ proprietary CorNet IP protocol) features and system management functions. ![]() The HiPath 4000 runs Siemens’ ComScendo software on top of an embedded Unix operating system. ![]()
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