C&C08 CC08 Switching System 128 Model

C&C08 CC08 Switching System 128 Model

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In terms of functions performed, the C&C08 Switching System can be divided into two parts: central Administration Module/Communication Module (AM/CM) and Switching Module (SM).A switching module itself can independently function as a switching system applicable to minor exchanges of small capacity.The maximum capacity of an SM is 6,688 L (lines).For a large-capacity exchange as illustrated in Figure 3-1, stacking of SMs becomes necessary, and these are interconnected through AM/CM.

It is through AM that the switching tasks among multiple SM modules are performed.AM can be considered as a large-capacity and zero-subscriber interface exchange.It has a 16K×16K TS switching network working as the switching center for the signaling and speech channels among the various C&C08 modules.

AM/CM is mainly for interconnecting the various modules like USM, TSM, UTM, RSA, and RSM through the 40.96Mbit/s fiber interface and standard USM E1 interface when establishing a single-SM C&C08 exchange.It is applicable to DC1--DL/TM trunk exchange, local exchange and toll-local-rural combined exchange with a capacity less than 200,000L, as well as various special networks.It provides the synchronous and timing clock reference source for the exchange to get synchronized with its parent exchange.It also provides a centralized alarm system for the entire exchange, and through BAM, the remote maintenance and network administration interfaces.

This decentralized control architecture of one AM supporting multiple SMs guarantees the system safety.In the case of any one module becoming faulty, only the subscribers of this module are affected, and the other SMs continue to work normally.For this reason, in a multi-module exchange, the capacity of a single SM is not supposed to be too large, and each module should be configured with the average switching module capacity of the office.Therefore, the capacity of an AM can be measured in terms of the number of standard SM that can be connected.Here, a standard SM refers to a communication functional module which can provide AM with 512 timeslots and one 2.048 Mbit/s HDLC common channel signaling protocol.

Figure 3-1   Location of AM/CM in C & C08