Protected muldem with interchangeable circuits of different data rates

摘要

A muldem (100) has a monitor (101) for testing data path failures and standby data protective switching means (108, 109) providing an alternate data path in the event of a malfunction. The system accepts up to fifty-six standard low speed T1 LS lines (1.544 Mb/s), up to fourteen standard intermediate speed T2 lines (6.312 Mb/s), or any combination of T1 and T2 lines to generate to standard HS lines (44.736 Mb/s). The T1 circuitry is replaceably interchangeable with the T2 circuitry.