255-700-261
B-21
PacketStar
®
8-Port Voice 2-Wire Station Module User Guide
, Issue 1
Release 8.0.0
Appendix B Reference Information
Quality of Service (QOS) Tables
based on your network applications supported by the PSAX system. The flex-
ibility of the PSAX system allows you to tailor the system based on the
required service applications by selecting the appropriate priority levels.
Table B-10. Cell Loss and Cell Delay Characteristics of ATM Service Classes
ATM Classes of Service
QoS Classes
Supported by
the PSAX
System
Cell Loss
Tolerance
Cell Delay
Tolerance
Internal
Priority
Constant Bit Rate (CBR)
Class 1
High
Very Low
CBR-1
Class 1
High
Very Low
CBR-2
Class 1
High
Low
CBR-3
Class 1
High
Low
CBR-4
Variable Bit Rate (VBR)
Variable Bit Rate—Real
Time (VBR-RT)
Class 2
Very Low
Very Low
VBR-1
Class 2
Low
Low
VBR-2
Class 2
Low
Low
VBR-3
Variable Bit Rate—Non-
real Time (VBR-NRT)
Classes 3, 4
Low
Medium
VBR-4
Classes 3, 4
Low
High
VBR-5
Unspecified Bit Rate (UBR) Class 5
Very High
Very High
VBR-6
Table B-11. Mapping ATM Service Classes to PSAX System Priority Levels
ATM Classes of Service
Internal
Priority
PVC Connection
Configuration
Selections
Service Examples
Constant Bit Rate (CBR)
CBR-1
CBR1
911 calls
CBR-2
CBR2
Preferred customers
CBR-3
CBR3
Standard
CBR-4
CBR4
Cellular
Variable Bit Rate (VBR)
VBR-1
VBR-express
Network management
Variable Bit Rate—Real
Time (VBR-RT)
VBR-2
VBR-RT1
Real-time videos
VBR-3
VBR-RT2
MPEG 1-2/JPEG
Variable Bit Rate—Non-
real Time (VBR-NRT)
VBR-4
VBR-NRT1
Frame relay data
VBR-5
VBR-NRT2
FTP/e-mail transfer
Unspecified Bit Rate (UBR) VBR-6
UBR
Internet Protocol data