Tandem Tie-Trunk Network - AT&T MERLIN LEGEND System Reference Manual

System Overview
T a n d e m
The tandem tie-trunk network has a station on one system connected to a station
on a third system via a tie-trunk connection in a second system. The tandem
network also can be used to connect to an external facility in the third system,
but the grade of service will be fair to poor if one or both tie trunks are analog
(see Figure 1-6).
Figure 1-6 Tandem Tie-Trunk Network
Capabilities 1-19