AT&T MERLIN LEGEND Release 2.0 System Programming And Maintenance Manual page 88

Glossary
A sequence of bits (usually eight) processed together. "Octet" is used
byte
instead of "byte" in CCITT (International Telegraph and Telephone
Consultative Committee) documentation.
Call Accounting System (CAS)
A vendor-supplied application that monitors and manages
telecommunications costs.
Call Management System (CMS)
A DOS-based application that simulates the actions of a system
operator by answering and distributing calls. CMS also produces
management reports for call analysis.
communications system
The software-controlled processor complex that interprets dialing
pulses, tones, and/or keyboard characters and makes the proper
interconnections both inside and outside the system. The
communications system itself consists of a digital computer, software,
a storage device, and carriers with special hardware to perform the
actual connections. A communications system provides voice and/or
data communications services, including access to public and private
networks, for telephones and data terminals on a customer's
premises.
control unit
The housing, carriers, power supply, processor, and modules of a
communications system.
display buttons
The buttons on an MLX display telephone used to access the
telephone's display.
DOS disk operating system
endpoint
The final destination in the path of an electrical or telecommunications
signal.
FCC Federal Communications Commission
Glossary GL-3