Electronic Telephone Exchange / Stored Program Control / Digital Telephone Exchange:

Electronic Telephone Exchange / Stored Program Control / Digital Telephone Exchange:

Switching Network:

The switching Network provides means of connection for telephone lines and trunk lines under directions provided by CPU with stored program in it’s semi-permanent memory.

Memory:

Temporary Memory	Semi- Permanent Memory
CPU stores information regarding calls in operation from scanner to temporary memory.	It consists of Operating Program and application program along with fixed data relating to telephone lines and trunk.

CPU:

It is the interface between software and hardware. It operates hardware according to instructions given by programs stored in semi-permanent memory.

Scanner:

CPU gets to know status of telephone lines and trunk by continuously scanning once in 100ms carried out by scanner.

CPU writes information about lines after each scan in temporary memory.

Each line and trunk is equipped with sensing device.

Distributer:

Signaling over lines and trunks are provided by the distributer under direction from CPU.

CPU tells distributer when to start and stop signaling.

Operator Console:

It is used by operating personal to control and observe overall process.

The operating personal can also write or erase data related to lines and trunk in semi-permanent memory.

Operator Console are used for:

 1. Alarm

 2. Line and trunk task facility            

 3. Display      

 4. Maintenance

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