dial backup meaning in English
拨号备份
Examples
- Chongqing expressway networking toll data communication network cotains 2 - ring and 8 - ray network structure based on expressway physical structure , setting up a trasmission trunk layer of sdh stm - 4 ( can be up - graded to stm - 16 ) , and channel protection business entry layer consisting of sdh onu / olt stm - 1 ( can be up - graded to stm - 4 ) . data exchange layer , through ip route exchange network above sdh network , forms 3 - level computer network structure of account settlement center - road section management company - toll station . to ensure obtaining original and reliable toll data from communication network , 2m circuitous chain is established between each toll station , accountsettlement center and road section management company , and also pstn dialing backup chain is set up between toll station and account settlement center . in order to maintain clock synchronization of the whole communication network , a proposal of sub - stage clock sychrononization signal network for differet network construction scale has been put forward in this design . in view of sensitivity and importance of toll data , this design particularly gives considerations of network safety and information safety for external and internel of network . therefore , communication safety , smoothness and reliability of networking toll system can be able to maintained in many ways
重庆高速公路联网收费数据通信网的结构是根据高速公路的物理结构构筑了2环8射的网状结构，建立了以sdhstm - 4 （可升级到stm - 16 ）的传输主干层，以sdhonu / oltstm - 1 （可升级到stm - 4 ）组成的通道保护业务接入层。数据的交换层是在sdh网之上的ip路由交换网，形成了结算中心-路段管理公司-收费站之间的3级计算机网络结构。为从通信网络上保证收费数据的原始性和可靠性，每个收费站和结算中心、路段管理公司之间建立了2m迂回链路，同时在收费站和结算中心之间建立了pstn的拨号备份链路。