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Before connecting to a network the IMG 1010 or IMG 1004 must be synchronized to a T1/E1 loop timing source such as a T1 or E1 DS-1. The IMG will allow up to four different clock sources to be connected to various inputs on the rear of the unit. Within the Clientview application, an object labeled Timing Synchronization Priority List can be configured. This list allows the IMG to set a priority on which clock source will get highest priority and which clock source will get lowest priority. For example, the default Timing Synchronization Priority List is configured so the IMG first determines if the Primary Reference Clock Port has a loop timing source on it. If it is does not, the IMG determines if the Secondary Reference Clock Port has a loop timing source on it. The IMG continues to check each configured clock in succession until it finds an available source.

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