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5. Advanced Setup
5-2 September 2005 6212-A2-GB23-00
Add Function – ATM PVC Configuration
If you want to add a new rule for the WAN interface, click on the Add button. The
ATM PVC Configuration screen appears. The ATM PVC Configuration screen
allows you to configure an ATM PVC identifier (VPI and VCI) and select a service
category.
Figure 5-2. ATM PVC Configuration Screen
Verify the following values with 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 defined are defined:
— UBR Without PCR (Unspecified Bit Rate without Peak Cell Rate)
— UBR With PCR (Unspecified Bit Rate with Peak Cell Rate) – UBR service
is suitable for applications that can tolerate variable delays and some cell
loss, such as data transfer, messaging, distribution, and retrieval, and
remote terminal applications such as telecommuting.
— 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), and audio and video
distribution and retrieval.
— 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.
— Realtime VBR (Real-time Variable Bit Rate) – Used for time-sensitive
applications such as real-time video. Rt-VBR service allows the network
more flexibility than CBR.