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To: jas cooper who wrote (8412)	5/4/1998 6:35:00 AM
From: Asymmetric	Read Replies (2) \| Respond to of 12559

Our WAN Backbone Connects Two Data Processing Centers, We have two data centers, one which backs up the other. Each DPC contains IBM 390 mainframes (several) with EMC data storage devices. The centers are connected through multiple DS-3 circuits which are connected to our ATM and then run over Sonet OC-48. Since the OC-48 is ring configured (it is as they say "mission critical"), the bandwidth is actually split and in event of fiber breakage, all circuits are rerouted in opposite direction. One of the problems is that even though we run multiple DS-3 DASD mirroring circuits (ie disk array storage devices where mirroring is an overnight updating process that ensures both data centers/databases have exactly the same data) they are barely able to finish their task prior to start of business day. Server farms are also tied together using multiple DS-3 circuits over ATM, as well as engineering & drafting which are using Catia (Dassault) PDM software and connected together via ATM DS-3 circuits. There's other stuff but much of it I'm not sure of the logic behind why they were chosen to be placed on a ATM vs an IP backbone. Hope this helps. Peter.