'Pulse b' presentation slideshows

INTRODUCTION TO PBX

INTRODUCTION TO PBX. PRIVATE BRANCH EXCHANGE. To international. Provincial Area. SC. ITSC. International telephone switching center. PC. LE. SC. SC. Secondary center. Tandem. GSP. TA Network. Tandem exchange. TE. TE. RCU. Subscriber. subscriber. LE. Local exchange. LE. LE.

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