rom under 1000 to over 100,000 subscribers.The typical digital switch has four components: the central processor, the switch matrix, a range of peripherals, and input/output controllers.Central Processor - The central processor controls call processing activities. Examples of some activities are assigning time slots and administering special calling features such as call forwarding. The central processor is also responsible for directing system-control functions, system maintenance, and the loading and downloading of software. The central processor is usually duplicated within a switch to ensure reliability. If the "hot" processor should develop a problem while a call is being processed, the system automatically shifts to the standby processor - without the caller noticing any interruption of serviceSwitch Matrix - This is also referred to as the network. It handles the actual connection of calls to their destinations. Peripherals - These convert incoming voice and data signals into the digital format used by the switch and perform some low-level call processing tasks. There are usually a range of peripheral modules to interface the range of lines and trunks coming in from the network. Input/Output Controller - This system provides access to the switch for billing, maintenance, loading of software, and routine operations and administration.The primary function of a switch is Picture - lucent.com/netsys/5ESS/familyto establish connections between telephones and data equipment for the transmission of voice or data. When a local call is placed, a digital switch performs multiple call processing functions. These functions are: Call Detection - Detection that the telephone receiver is off the hook. Dial Tone Provided - Provides dial tone to the caller. Digit Collection - Collects the dialed digits. Digit Translation - Translates dialed digits into a call number. Call Routing - Routes the call to its destination. Call Connec...
