Zhone 6218 用户手册

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6218-I2 Wireless Router User’s Guide

6218-A2-ZB23-10

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. 

   

Verify the following values with your ISP before you change them.

z

VPI (Virtual Path Identifier) – The valid range is 0 to 255.

z

VCI  (Virtual Channel Identifier) – The valid range is 32 to 65535.

z

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.