论文部分内容阅读
1.前言 903机属用户小交换机,具有内部通话自动接续性能外,另配有出、入中继电路与电话局连接通话。本机用户向自动局用户呼叫时,主叫用户摘机听拨号音,拨“0”,交换机用标将主叫用户接到一条空闲的出中继上,此时主叫再听到自动局送来的拨号音后,就可拨所需的号码。本机1978年10月装于名山县局作市话自动接续用,入中继作为长途呼入,出中继未利用。区乡农话经磁石农话台转接,占用14条用户电路门子。为了充分发挥该机效能,可利用出中继为本机至农话磁石台的出口,节省所占用户门子的数量。
1. Preface 903 machine is a small user switch, with internal call auto-continuity performance, the other with out, into the trunk circuit connected with the telephone exchange. When a local user calls an automatic station user, the calling user picks up the dial tone and picks “0”. The switch will dial the calling user to an idle outgoing trunk, and the caller then hears the auto station Send the dial tone, you can dial the required number. The machine was installed in Mingshan County Bureau in October 1978 for local automatic connection, into the relay as a long-distance incoming, out of the relay is not used. District Township agricultural transfer by magneto-rheological Taiwan, occupying 14 user circuit door. In order to give full play to the performance of the aircraft, the relay can be used as a local outlet to the magneto-agrarian Taiwan, saving the number of users of the door.