Broadband matrix switching and terminating equipment

This paper discusses the design of a switching matrix that is a combination of relays and diode crosspoints, and the design of line and trunk termination equipment associated with it. This switching matrix and termination equipment will have, in addition to normal telephone design parameters (long life, low cost, ease of replacement, etc.), a frequency-range capability of 15 times the 0-4,000-cycle-per-second range normally used in telephone systems today.