D-Link DSL-2320B - 24 Mbps DSL Modem User Manual page 24

Section 7 - Home
Note: The Following settings are ISP dependant. For information regarding proper configuration, contact your ISP.
VPI: Virtual Path Identifier. The valid range is 0 to 55.
VCI: Virtual Channel Identifier. The valid range is 3 to 65535.
Service
Five classes of traffic are listed:
Category:
UBR Without PCR
(Unspecified Bit Rate
without Peak Cell Rate):
UBR With PCR
(Unspecified Bit Rate with
Peak Cell Rate):
CBR (Constant Bit Rate):
Non Realtime VBR
(Non-Real-time
Variable Bit Rate):
Realtime VBR (Real-time
Variable Bit Rate):
Quality of
Can be enabled only for UBR without PCR, UBR with PCR, and Non Realtime VPR.
Service:
D-Link DSL-30B ADSL+ Ethernet/USB Modem User Manual
(Unspecified Bit Rate without Peak Cell Rate) UBR
service is suitable for applications that can tolerate
variable delays and some cell losses. Applications
suitable for UBR service include text/data/image
transfer, messaging, distribution and retrieval
and also for remote terminal applications such as
telecommuting.
(Unspecified Bit Rate with Peak Cell Rate ) UBR
service is suitable for applications that can tolerate
variable delays and some cell losses. The Peak Cell
Rate is a determining factor in how often cells are
sent in an effort to minimize lag or jitter caused by
traffic inconsistencies.
(Constant Bit Rate) Used by applications that require a fixed data rate that is continuously available
during the connection time. It is commonly used for uncompressed audio and video information such as
videoconferencing, interactive audio (telephony), audio / video distribution (e.g. television, distance learning,
and pay-per-view), and audio / video retrieval (e.g. video-on-demand and audio library).
(Non-Real-time Variable Bit Rate) Can be used for data transfers that have critical response-time
requirements such as airline reservations, banking transactions, and process monitoring.
(Real-time Variable Bit Rate) Used by time-sensitive applications such as real-time video. Rt-VBR service
allows the network more flexibility than CBR.
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