Cisco BPX-BXM-155-8DX Installation And Configuration Manual page 621

V
A CCITT interface standard often used for data transmission over modems.
V.21
A data communications interface standard adopted by the CCITT. Often used for data circuits
V.35
operating at 56 Kbps and above.
Used to statistically compress voice by not sending packets in the absence of speech.
VAD (Voice Activity
Detection)
Connection type for variable bit rate traffic such as bursty data. Compare with CBR and ABR.
VBR (Variable Bit
Rate)
ATM and Frame Relay traffic is carried in Virtual Channels which are set up between adjacent ATM
VC
or Frame Relay switches before data transmission occurs. An ATM link between switches may
support up to 2
Each VC within a specific Virtual Path on a link has a unique Virtual Channel Identifier, which is a
VCI
16-bit number .
A component of a Service Class Template which contains platform-specific VC configurations that
VC Descriptor
are indexed primarily by service type. Together with a Class of Service Buffer (CoSB) descriptor
Template
template, it defines a Service Class Template (SCT).
Frame relay buffer allocation parameter that specifies the maximum queue size reserved in the FRP
VC_Q
card for the FR connection.
A circuit that acts like it is an individual transmission path but is actually shared with other circuits
virtual circuit
over a single transmission path. Compare with PVCs.
A Virtual Trunks is a Virtual Path Connection which appears to VSI masters as ordinary trunk (except
Virtual Trunks
that the trunk supports 64k VCs at most). In a VSI platform, a virtual trunk endpoint has its own
logical interface.
The adjunct processor used in the INS Voice Network Switching application. The VNS is co-located
VNS
with and connected to an IGX switch.
An INS application used to provide voice or data switched virtual circuits over a Cisco WAN
Voice Network
Switching switching network for PBXes using either QSIG or DPNSS signalling.
A Virtual Path is a bundle of 2
VP, VPC, VPI
first 12 bits of the VPCI. Most ATM switches can switch VPs using only a single cross-connect
(instead of up to 2
is a Virtual Path Connection.
Each VC on a link has a unique Virtual Path and Channel Identifier, which is a 28-bit number. The
VPCI
VPCI consists of a 12-bit VPI concatenated with a 16-bit VCI.
Virtual Switch Interface: this is a proposed common control interface to all Cisco MSSBU switches.
VSI
It embodies both connection management and switch configuration discovery capabilities.
Virtual Switch Interface, Protocol Version 2: this is revision 2 of a proposed common control interface
VSI 2
to all MSSBU switches. It embodies both connection management and switch configuration discovery
capabilities.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
28
different VCs, although a small number of VCs is reserved for special purposes.
16
Virtual Connections with the same Virtual Path Identifier, that is, the
16
). An end-to-end sequence of VPs cross-connected at the intermediate switches
Cisco BPX 8600 Series Installation and Configuration
Glossary
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