ZMUX-122 is an E1 protection switching device which can automatically switch between one set of E1 signals (lines) with different routes to meet the four E1 lines to protect two important E1 lines transmission.

    ZMUX-124 is an E1 protection switching device which can automatically switch between two grounds of E1 signals (lines) with different routes to meet the eight E1 lines to protect four important E1 lines transmission

    ZMUX-128 is an E1 protection switching device which can automatically switch between two grounds of E1 signals (lines) with different routes to meet the 16channel E1 lines to protect 8channel important E1 lines transmission.

    ZMUX-1200 is a large-capacity centralized E1 protection switching device that can automatically switch between two sets of E1 signals (lines) with different routes,and meets the 112channel E1 line to  protect important 56 channel E1 lines transmission.