A$.2$ An ISDN customer has offices at a number of sites. A typical office is served by two $1\mathrm{.}544-$Mbps digital pipes. One provides circuit$-$switched access to the ISDN; the other

A$.7/$ PROBLEMS

$769$

is a leased line connecting to another user site. The on$-$premises equipment consists of a PBX aligned with packet$-$switching node logic. The user has three requirements:

Telephonc service

A private packet$-$switched network for data

Video teleconferencing at $1\mathrm{.}544Mbps$

How might the user allocate capacity optimally to meet these requirements?