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4-Port ADSL Router Lynx L-325
User Manual
23
Version 1.0
Document #: BD-AU0007-10
• VPI: Virtual Path Identifier. The valid range is 0 to 255.
• VCI: Virtual Channel Identifier. The valid range is 32 to
65535.
• Service Category: Five classes of traffic are listed—
o UBR Without PCR
(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.
o UBR With PCR
(Unspecified Bit Rate with Peak Cell
Rate)
--
o CBR
(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).
o Non Realtime VBR
(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.
o Realtime VBR
(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.
Enabling QoS for a PVC improves performance for selected
classes of applications. However, since QoS also consumes
system resources, the number of PVCs is reduced. If you want to
enable QoS service, click on the Enable Quality Of Service check
box.