Work should be accomplished on a clear day when lightning strikes are less likely to occur. The importance of proper installation cannot be stressed enough. This shelf is a central part of the isolation device. It is where the CO and the station cables are kept separate by the isolation gap. The station cable is connected to the upper right hand side of the shelf, and feeds through a secondary protector before going on to the local services.
Power is supplied to the shelf, when needed.
This describes the bones of the system. The meat of the system is how to get the telecommunication signals across the isolation gap. The isolation circuit cards accomplish this. They are the heart of the system. These cards plug into the shelf and are the telecommunication bridge between the CO and station sides of the assembly.