Specifications

UNI
User Network Interface
User card
A Voice card, Data card, or Alarm card.
VBR
Variable Bit Rate
VC
Virtual Channel
VCL
Virtual Channel Link
VP
Virtual Path
VPC
Virtual Path Connection
WA N
Wide Area Network
WAN Card
Wide Area Network Card (one of the cards for this system).
wideband
A bandwidth equal to many individual channels
X.50
CCITT (ITU) standard data transmission protocol.
yellow alarm
Remote alarm on a T1 line. A major failure has occurred at a remote location.