Zhone IMA CS-200 System Reference Manual page 293

User port
A Voice port, Data port, or Alarm port.
VBR
Variable Bit Rate
VC
Virtual Channel
VCL
Virtual Channel Link
VP
Virtual Path
VPC
Virtual Path Connection
WAN
Wide Area Network
WAN port
Wide Area Network port (one of the ports 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.
ZCS
Glossary -19