WT4 Millimeter Waveguide System: Protection Switching, Auxiliary Communication, and Maintenance

The WT4/WT4A system 1 is intended to interconnect major traffic nodes in the toll transmission network. Figure 1 is a layout of such a span. Main repeater stations are located at the ends of the span and a number of important functions must be provided by span terminating bays at these locations. An obvious one is the interface with the rest of the Bell System. This function is performed by the cross-connect bays and the 2103 o A r 500 km max- - 1 I m oo CO - CO H m 2 o X o > O c m a m O m S 00 m D O ·vl CD MAIN STATION ---H WAVEGUIDE REPEATER STATION ->) WAVEGUIDE [- MAIN STATION Fig. 1--Layout of protection span.