Cisco Unified Videoconferencing Solution Reference Network Design (SRND)
Glossary
Downloads: This chapterpdf (PDF - 352.0KB) The complete bookPDF (PDF - 2.74MB) | Feedback

Glossary

Table Of Contents


Glossary

Last revised on: October 30, 2009

 


Numerics
 
802.1P
802.1Q
802.1P and 802.1Q are the standards proposed by the inter-working task groups of the 802 standards committee. 802.1Q is the IEEE Standard for Local and Metropolitan Area Networks: Virtual Bridge Local Area Network (VLAN). 802.1P is the IEEE Standard for Local and Metropolitan Area Networks - Supplement to Media Access Control (MAC) Bridges: Traffic Expending and Dynamic Multicasting Filtering.


A
 
ARQ
Admission Request


B
 
Border Element
A device that is used in the periphery of the network to separate two different networks and to serve as a demarcation device
BRI
Basic Rate Interface


C
 
CAC
Call admission control
Cascade
The process of connecting two or more MCUs to create a larger conference.
Codec
Coder-decoder, for digitizing voice and video. Compression algorithms can also be used during the digitizing process.
CoS
Class of Service
cRTP
Compressed Real-time Transport Protocol


D
 
DID
Direct Inward Dialing
DSCP
Differentiated Services Code Point is an Internet Engineering Task Force (IETF) standard that uses six bits in the ToS (Type of Service) field of the IPv4 header to specify class of service for each packet.
DTMF
Dual Tone Multi-Frequency


E
 
E.164
Address format used for H.323 devices
EMP
Enhanced Media Processor


G
 
Gatekeeper
Used for H.323 registration, call routing, and admission control
G.711
G.711 pulse code modulation (PCM) encoding provides 64 kbps analog-to-digital conversion using mu-law or a-law.


H
 
H.261
Video codec protocol
H.263
Video codec protocol
H.323
Standard protocol for audio, video, and data communications across IP-based networks
H.323-ID
Alphanumeric identifier assigned to an H.323 video terminal
hopoff
Command added to a Cisco gatekeeper for static inter-zone routing
HSRP
Hot Standby Routing Protocol


I
 
IMUX
Inverse Multiplexer
IP
Internet Protocol
IP Precedence
IP Precedence uses the three precedence bits in the ToS (Type of Service) field of the IPv4 header to specify class of service for each packet.
ISDN
Integrated Services Digital Network
IVR
Interactive Voice Response


L
 
LAN
Local Area Network
LLQ
Low Latency Queuing is a QoS mechanism that ensures the timely queuing of critical, delay-sensitive traffic.
LRQ
Location Request


M
 
MC
Multipoint Controller
MCM
Multimedia Conference Manager
MCU
Multipoint Control Unit, used for video conferences containing more than two endpoints
MP
Multipoint Processor
MSN
Multiple Subscriber Number


P
 
PRI
Primary Rate Interface
Proxy
H.323-to-H.323 gateway used for assigning QoS and security access
PSTN
Public Switched Telephone Network


Q
 
QoS
Quality of Service


R
 
RAS
Registration, Admission, and Status protocol
RRQ
Registration Request
RSVP
Resource Reservation Protocol
RTCP
Real-time Control Protocol
RTP
Real-time Transport Protocol


S
 
SCCP
Skinny Client Control Protocol
Service Prefix
A digit string used to identify a service on an MCU or gateway
Stacking
Grouping MCUs to obtain a larger number of multipoint conferences


T
 
ToS
Type of Service


W
 
WAN
Wide Area Network
WRED
Weighted Random Early Detection
WRR
Weighted Round Robin


Z
 
Zone
A logical group of H.323 infrastructure components managed by a single gatekeeper
Zone Prefix
A digit string used to identify a group of H.323 devices