Southwestern Bell Telephone's ISDN experience

摘要

Southwestern Bell Telephone's (SWBTs) integrated services digital network (ISDN) experience has been heavily influenced by the realization that from a customer perspective, the most important aspects of ISDN are its applications. The authors describe the following ISDN applications that SWBT has been exploring: desktop conferencing; asynchronous protocol conversion to SNA/SDLC; VTAM INN link replacement; asynchronous protocol conversion to SNA/SDLC with multiplexing; remote 3174 multiplexing via B channel packet; remote 3174 multiplexing via B channel packet and NPSI; 327X emulation via SIMPC, SIM-VTAM, and NPSI; 327X emulation with QLLC and NPSI; asynchronous access to private packet-switched networks; asynchronous access to UNIX host; asynchronous access to UNIX host via PAD and X.25 multiplexing; 327X coaxial cable elimination; extended local area network with passive bus; asynchronous access to Ethernet terminal server; dedicated line replacement (64 kb/s); asynchronous modem pooling (out-dial); asynchronous modem pooling (in-dial); ISDN wide-area networking; ISDN data gateway; gateway to AppleTalk network; application processor features; circuit-switched compressed video; and Ethernet LAN bridging.