BORSCHT
BORSCHT is an acronym for:
Battery supply to subscriber line
Overvoltage protection
Ringing current supply
Supervision of subscriber terminal
Coder and decoder (codec)
Hybrid, 2 wire to 4 wire conversion
Testing[1]
The electronic functions collectively known as BORSCHT are used in plain old telephone service (POTS) telephony signaling, line supervision and telephone terminal operation. BORSCHT circuitry is typically located on a telecommunications network line card and is increasingly integrated into a chipset by several semiconductor companies for low-cost implementation of a standard POTS telephone interface for non-traditional telephony networks such as cable television networks, fiber optic, VoIP and wireless local loop.
Some first generation digital Class 5 telephone switches or end office switches reduced the termination costs by using analog switching (concentrators) to a common codec.