| 摘要 |
To eliminate the necessity of providing a special heat insulating structure or heat resisting properties and to simplify wiring. A modulation/demodulation unit, transmission/reception units of active and standby transmission systems, branching units of active and standby transmission systems, and a line switching and monitor control unit are accommodated in one casing. The modulation/demodulation unit and the line switching and monitor control unit, commonly used in the active and standby transmission systems, are incorporated in the lower part of the casing, and the transmission/reception units and the branching units of the active and standby transmission systems are incorporated in the upper part of the casing. The transmission/reception units and the branching units of the active and standby transmission systems are arranged in parallel such that the branching units are positioned at the center thereof.
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