Virtual Private-Line Performance and Customer Cost Impacts
Diane D. Sheng · AT&T Technical Journal · 1988
There has been considerable activity in the data networking area to develop architectures for virtual private-line networks as alternatives to private-line networks. This paper provides a comparative performance report of virtual private-line networks and private-line networks for SNA™/SDLC and 3270 BSC applications. (SNA is a trademark of IBM Corporation.) In particular, we discuss the effects on end-to-end performance of various virtual private-line protocol-handling capabilities in terms of the degree to which they produce better or worse network performance levels than private-line networks. Beyond performance optimization, it is also important to understand the customer's view of the economic impact of the various protocol-handling capabilities of virtual private-line networks. So, we also discuss the effects of these virtual private-line networking capabilities and suggest that they can lower a customer's facilities, modem, and data service unit costs.