本文着重介绍市话局用户呼叫小交换机用户的全自动接续的各种接口电路方案。

This Paper introduces the interface circuits schemes of the PABX that realizes the local office subscribers to call the subscribers of PABX.

youdao

本文着重介绍市话局用户呼叫小交换机用户的全自动接续的各种接口电路方案。

This Paper introduces the interface circuits schemes of the PABX that realizes the local office subscribers to call the subscribers of PABX.

youdao