Glossary
GL-22
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
usage parameter
control
See
UPC.
USART
universal synchronous/asynchronous receiver transmitter.
A single-chip device used in certain applications that allows microprocessors to communicate with
input/output (I/O) devices.
user-to-network
interface
See
UNI.
V
V.21
A CCITT interface standard often used for data transmission over modems.
V.35
A data communications interface standard adopted by the CCITT. Often used for data circuits
operating at 56 Kbps and above.
VAD
voice activity detection.
Used to statistically compress voice by not sending packets in the absence of speech.
variable bit rate
See
VBR.
VBR
variable bit rate.
Connection type for variable bit rate traffic such as bursty data. Compare with CBR and ABR.
VC
ATM and Frame Relay traffic is carried in Virtual Channels which are set up between adjacent ATM
or Frame Relay switches before data transmission occurs. An ATM link between switches may support
up to 2
28
different VCs, although a small number of VCs is reserved for special purposes. A circuit
that acts like it is an individual transmission path but is actually shared with other circuits over a single
transmission path. Compare with PVCs.
VC descriptor
template
A component of a Service Class Template which contains platform-specific VC configurations that
are indexed primarily by service type. Together with a Class of Service Buffer (CoSB) descriptor
template, it defines a Service Class Template (SCT).
VCI
virtual channel identifier.
Each VC within a specific Virtual Path on a link has a unique VCI, which is a 16-bit number.
VC_Q
Frame relay buffer allocation parameter that specifies the maximum queue size reserved in the FRM
card for the FR connection.
virtual channel
identifier
See
VCI.
virtual circuit
See
VC.
virtual path and
channel identifier
See
VPCI.
virtual
source/virtual
destination
See
VS/VD.
Summary of Contents for BPX 8650
Page 49: ...P A R T 1 The BPX Switch ...
Page 50: ......
Page 159: ...P A R T 2 Installation ...
Page 160: ......
Page 273: ...P A R T 3 Initial Configuration and Network Management ...
Page 274: ......
Page 311: ...P A R T 4 Configuring Connections ...
Page 312: ......
Page 487: ...P A R T 5 Troubleshooting and Maintenance ...
Page 488: ......
Page 533: ...P A R T 6 BPX Specifications ...
Page 534: ......
Page 555: ...P A R T 7 Appendices ...
Page 556: ......