ADTRAN DSU III ARdc User Manual page 123

tail circuit
A feeder circuit, which may be digital or analog, that provides an access line to a digital or
analog network.
UL
Underwriters Laboratories. A laboratory established by the National Board of Fire
Underwriters that tests equipment, materials, and systems that may affect insurance risks,
with special reference to fire dangers and other hazards to life.
V.25 bis
Automatic calling and answering command set including the ability to work with async,
bisync, and HDLC devices. Provides a small subset of the functions of the Hayes Stan-
dard AT Command Set.
V.35
CCITT standard for trunk interface between a network access device and a packet net-
work that defines signaling for data rates greater than 19.2 kbps.
VT 100
A non-intelligent terminal or terminal emulation mode used for asynchronous communi-
cations. Used to configure the ADTRAN SMART 16 Shelf.
61200270L1-1 DSU III ARdc User Manual
Glossary
Glossary-11