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OCR: ATM BACKBONE FOR INTEROPNET '96 Network Operations Center 3Com router Fore ATM switch Internet Bay router 0012 Fore ATM switch Bay ATM switch (3Com router 3Com router 3Com router 3Com router: 3Com router 3Com router Bay router Bay router Bay router Bay router Bay router Bay router Connections to exhibitor booths Connections to exhibitor booths Figure 1. Anatomy of an ATM Champion. Based on RFC 1483 permanent virtual circuits (PVCs), the 1996 Interop Net's ATM backbone features a diverse collection of equipment from various vendors. As the InteropNet becomes ever larger, one of the biggest challenges in maintaining this portion of the network has been harness- ing the complex mesh of PVCs.