I'm confused about the PBX & external infrastructure.

Spud1200

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England, UK
I curious to know more about the basics that if we have a central office or exchange for a public telephone system, that I think these Exchanges are connected to one another by the physical medium of a wired telephone line from say my house to my grans house. I'm thinking that the actual phone system being routed by the cabling runs threw several exchanges or just one exchange in order to reach its destination.

Based on the actual telephone number from the area code to the sets of digits on in the number then thats how the phone is connected threw the public telephone system. Yes? No?

If we have a PBX sitting out side my block of flats and someone rings my house phone, this actual box will route the call up and threw my line that I rent off my Service provider.

Telephone lines being called trunks.

What is the Job of the PBX internally as in if we have 5 trunk lines coming to my block that are under ground or say 10 lines, how does the PBX route these calls.

Is Digital safer than analogue.
 
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