5E pretty much nailed it on the head. The CFA tells you on which facility and channel a particular circuit will be located.

For example, I might need to order a DS1 for a new customer. The customer is in Verizon's territory. I have a bunch of DS3 circuits to Verizon.

The CFA will identify which DS3 the circuit will be used to get the circuit from me to Verizon. The CFA will also tell us which channel of the DS3 the circuit will be assigned to.

So, if I need to install a circuit, 95/HCGS/1234556/NE I can tell Verizon, "I want to use the following CFA: 4502/T3/BSTNMACOK32/CMBRMABEK31/ channel 20 (A muxed DS3 can support up to 28 DS1s).

I Love FEATURE 00