D-Link DSL-2640U User Manual download pdf (Page 19)

Find out the following values from your ISP before you change them.

• 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.

• Quality of Service: Can be enabled only for UBR without PCR, UBR with

PCR, and Non Realtime VPR.

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D-Link DSL-2640U User Manual Page 19