Thanks for all the insight. With this info and some Google research, let me see if I have this right:
From what y'all have said, it appears that a dedicated T1 line goes from the central office where the DC exchange is to my local central office here in Virginia.
At the local office, the T1 is divided and one channel is connected to my telephone.
Dumbed down to layperson understanding (that's me), is this the general idea?
General idea is close... Yup.
There probably is NOT a dedicated T1 from the DC switcher to your serving office. Telco’s maintain inter-office T1 capacity (and higher of course) between exchanges/central-offices. Part of the process of building your FX (foreign exchange) circuit when you first ordered it, was picking the dedicated path over various channelized T1 facilities o get from A (your serving switch in DC) to your serving wire center.
