Main Station, Line Interconnection, and Signal Administration

The L5 line connecting equipment fulfills several functions, including the routing of jumbogroup signals for through, branched, or terminal connections of the message service on the line. Any combination of three jumbogroup signals may be sent along the through route, branched directly to another route, or dropped locally to a multiplex terminal. Line pilots for dynamic equalization, temperature regulation, and office synchronization, as well as tones for fault location and protection switch control, are also administered in the line connecting equipment. The multiplex equipment separates the line signal into three basic lumbogroup signals which may be connected directly to other cable or radio facilities in any combination of up to six contiguous mastergroups through the basic jumbogroup trunk bay. The basic jumbogroups may also undergo further demultiplexing locally for lower forms of circuit administration, such as basic mastergroup, supergroup, group, or even voice frequency.