Mastergroup and supermastergroup carrier multiplex equipment

Telephone carrier systems of 2700-channel capacity are presently being used in increasing quantities on main communication arteries linking important traffic centers. The mastergroup and supermastergroup equipment is in conformity with International Standard Equipment Practice (ISEP), and designed to accord with the CCITT-recommended frequency-translating scheme 1. That is, higher-order modulation stages of the terminal multiplex system may comprise 300-channel mastergroups and 900-channel supermastergroups. The equipment completes, with the existing ISEP versions of channeling, group and supergroup equipments, a whole range of transistorized equipments designed to cover a variety of carrier multiplex systems up to 2700 channels. It takes into account as many as possible of the requirements of the various telephone administration and operating companies.