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What is DSL ATM VC & VPI
Name: bbmak Date: September 14, 2007 at 11:02:27 Pacific OS: Windows 2003 CPU/Ram: 1024
Comment:
I want to know what is the ATM setting in the DSL modem mean?
Name: StuartS Date: September 14, 2007 at 12:05:21 Pacific
Reply:
ATM stand for Asynchronous Transfer Mode. It is a Point-to-Point protocol which is used to connect to your ISP, usually abbreviated to PPPoATM. The other common method is PPPoEthernet.
VPI stand for Virtual Path Identifier and define how an ATM cell it routed. Used in conjunction with VCI; Virtual Channel Identifier.
VC stand for Virtual Circuit. It is a circuit that is defined by the VPI/VCI pair You can define as many Virtual circuits as you like, but only one can be active at any one time. So you usually define just one and give it number one.
Non of the parameters you have any choice over. They are determined by your ISP and you have to use what they tell you. Most ATM routers will determine these settings automatically.
In the UK where PPPoATM is the norm it is usually 0 for VPI and 38 for VCI. Other countries will vary.
Stuart
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Response Number 2
Name: bbmak Date: September 14, 2007 at 13:40:03 Pacific
Reply:
i have 0 for VPI and 32 for VCI
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Response Number 3
Name: StuartS Date: September 14, 2007 at 14:01:43 Pacific
Reply:
If it works leave it. If not try 0/38 if you are in the UK
The only country I know of that uses 32 for VCI is Spain but they also use a VPI of 8 or 1.
Its not a case of which is best, but which one works.
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