网络拓扑采用星形结构，所有机架向后连接到管理机架的主交换机。
The network topology takes a star shape, with all racks connecting back to a main switch in the management rack.
如果要创建冗余的解决方案，就一定要把主交换机和辅交换机分别放在机架的上半部分和下半部分。
If you are creating a redundant solution, it's important to split the primary and secondary switch between the upper half and lower half of the chassis.
大部分支持VIP的交换机也能支持主用系统或备用系统的策略，以便流量跑到主用系统那里，除非它不可用或验证失败。
Most switches that support a VIP can also support a policy of primary system or secondary system, so that traffic goes to the primary system unless it is unavailable or fails the validation.
业务网络层：业务网络采用成熟的以太网交换机冗余技术，比如堆叠或者主备模式。
Service network layer: the service network USES the mature Ethernet switch redundancy technology, such as the stack or main standby mode.
中心站与交换机的主配线架相连，并提供所有接口。
Central station connects MDF of exchangers and provides all interfaces.
专用综合服务网络交换（PINX）是在BRI语音应用中使用QSIG信令的专用分组交换机或主系统。
Private INtegrated services network eXchange(PINX) is a PBX or key system which, in a BRI voice application, uses QSIG signaling.
专用综合服务网络交换（PINX）是在BRI语音应用中使用QSIG信令的专用分组交换机或主系统。
Private INtegrated services network eXchange(PINX) is a PBX or key system which, in a BRI voice application, uses QSIG signaling.
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