Definitions
Central Office (C.O.)
- Telephone company facility where subscribers' lines are joined to switching equipment for connecting other subscribers to each other, locally and long distance.
CSU/DSU
- A device which terminates a digital channel on a customer’s premises
- Line coding/conditioning & loopback testing from C.O.
- Similar to a modem except it doesn’t perform dial-up
Channel Bank (Multiplexor)
- A multiplexor that merges several low-speed voice or data lines into one high-speed (typically T1) line and vice versa.