L-4 System: Terminal arrangements

New terminal equipment has been developed to provide the six-mastergroup signal that the L-4 repeatered line is capable of carrying. A major component of this equipment is the MMX-2 mastergroup multiplex, which translates six basic 600-channel mastergroups to their line frequency assignments in the range 0.564 to 17.548 MHz. Another component is the line connecting equipment, which contributes to shaping the line signal frequency characteristic and provides for blocking mastergroups. The purpose of this blocking is to provide dropping and branching with recovery of the spectrum for transmission of other mastergroups. Mastergroup connectors are available for flexible interconnection of basic mastergroups without demodulation to supergroups. Finally, existing line protection switching equipment has been modified for use with the L-4 Coaxial System.