This paper describes the implementation and evaluation of the switching network equipment of a 620-Mb/s circuit-switching system, which will economically provide both 4-MHz bandwidth television and high-definition television services. A bit-synchronization LSI capable of handling 52-Mb/s, 155-Mb/s, and 620-Mb/s input signals was developed for this equipment. This LSI together with a 1.5-Gb/s space-division switch LSI and high-speed physical design technology were used in constructing a prototype. A feature of this prototype is that it is designed with multiple printed circit boards which plug into a back panel. Although a switching board that can deal with over 620 Mb/s has previouly been developed, such an implementation is new. Evaluation of the prototype shows that it satisfies the system objectives.