Telephony

In: Computers and Technology

Submitted By swapfilez
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1) What is the significance of a digital switch and when was it first introduced?
First introduced in 1979 by Nortel Networks, the digital switch is a faster and more efficient way to handle calls. It provides functions such as routing, converting analog to digital signals or offering features on per line basis. It provides a 99.999 uptime.
Most switches are built on five functional areas, the stored program control system(scps), the line module, the trunk module, the ancillary controls and the maintenance controls.

2) Define the following modules
• CPS – central processing system: the brains of the switch: Main functions are global call processing, network control, signaling control, maintenance and administration. It is responsible for system recovery, upgrades and billing.

• NCP – Network control processor: mini brains of the switch: The NCP is connected to the CPS and the line and trunk modules. The NCP receives questions from the line and trunk units regarding call routing, features requests, and so forth. The NCP holds all subscriber line information and refers to it when the line module requests a path through the switching fabric.

• ICS – Interface controller: The IC sits between the switching fabric(NCP) and the line or trunk modules and is used to connect the two. It also talks directly to the NCP. The IC can be considered the highway that is used to pass messages between the different modules.

• TRUNK MODULE – The portion of the switch where the trunk circuits terminate

• LINE MODULE – The portion of the switch where the individual POTS lines terminate

4) Explain the difference between a tandem switch and a class 5 switch:
A class 5 switch is responsible for all line-side terminations. Also called end office switch because it sits at the central office. Tandem switches (class 4 switches) are used to connect class 5…...

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