2. • CPS – (central processing system) Brains of the system • NCP – (network control processor) mini brains, controls switching • ICS – (Interface control system) interface between the NCP and the trunks • Trunk module – portion of the switch where the trunks terminate • Line module – portion of the switch where the individual POTS line terminate
3. Explain the difference between a tandem switch and a class 5 switch.
Tandem switches route between trunks to the class 5 switches whereas the class 5 switches control thousands of lines
4. Explain the difference between a tandem switch and a long distance switch.
Tandem switches route to class 5 local trunks where long distance switches find available trunks in different regions
5. Explain the difference between a long distance switch and an international switch.
The long distance switch finds trunks in a different region whereas the international switches find switches in other countries and then performs a signal conversion for compatibility.
6. Explain how a class 5 switches routes a call traveling between two lines that are served from the same switch.
Routes from the end office to the tandem which would connect both through the class 5 switch which can handle the load of thousands of subscriber lines.
7. Explain how a call is routed between an end-office switch and the local tandem switch.
Routes from one end office to a LD switch then to another LD switch which is connected to the Tandem switch.
10. Why do business customers purchase private branch exchanges?
These are used in situations where the amount of processing power needed is not as great so that you can call other depts., within the business in a cost effective manner.
14. Define each part of the following number as defined by the North American numbering plan: 818-555-9877.
818 is the area code identifying the