G-18
DL3800 DS1 Inverse Multiplexer User Guide—February 1999
G
TRAP
A mechanism by which a device automatically sends an alarm for certain
network events to a management station. The management station can initiate
a polling sequence to the device to determine the cause of the problem.
U
UAS (Unavailable Seconds)
Number of seconds elapsed after 10 consecutive SES events are received (ESF
framing only).
V
V.35
A CCITT standard for the trunk interface between a network access device and
a packet network. It deÞnes signaling for data rates greater than 19.2 Kbps.
V.52
Terminal emulation standard. CCITT standard (1976) for various loopback
tests that can be incorporated into modems for testing the telephone circuit and
isolating transmission problems. Operating modes include local and remote
digital loopback and local and remote analog loopback.
V.54
A CCITT standard for loop test devices in modems. It deÞnes local and remote
loopbacks.
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