27 October 2011

How to configure your ADSL for Telkom VPI VCI and Encapsulation

Some DSL modems are pre-configured to work with Telkom.  Other need to be set up manually.

Here are the recommended settings:

  • Encapsulation required = PPPoE
  • Multiplexing = LLC based
  • VCI = 35
  • VPI = 8


To verify if your Telkom line is ADSL enabled check here:
https://secureapp.telkom.co.za/ADSLVERIFY_NEW/

Do do a speed test to see that you are getting the right kind of throughput run the test from here:
http://speedtest.net/


If you want to know what the settings are and what they mean read on...

Encapsulation
The Point-to-Point Protocol over Ethernet (PPPoE) is a network protocol for encapsulating Point-to-Point Protocol (PPP) frames inside Ethernet frames. It is used mainly with DSL services where individual users connect to the DSL modem over Ethernet.


Multiplexing
Logical Link Control (LLC) is the upper sublayer of the OSI data link layer. The LLC is the same for the various physical media (such as Ethernet, token ring, and WLAN).
The LLC sublayer is primarily concerned with:
Multiplexing protocols transmitted over the MAC layer (when transmitting) and demultiplexing them (when receiving).
Optionally providing flow control and detection and retransmission of dropped packets, if requested.


ADSL Options

VCI Stands for "Virtual Channel Identifier." The VCI, used in conjunction with the VPI (virtual path indicator), indicates where an ATM cell is to travel over a network. ATM, or asynchronous transfer mode, is a method that many ISPs (Internet Service Providers) use to transfer data to client computers. Because ATM sends packets over fixed channels, the data is easier to track than information sent over the standard TCP/IP protocol.

The VCI within each ATM cell defines the fixed channel on which the packet of information should be sent. It is a 16-bit field, compared to the VPI, which is only 8 bits. Since this numerical tag specifies the virtual channel that each packet belongs to, it prevents interference with other data being sent across the network.



The information was sourced from various sources on the internet so credit to them and all the other users that have contributed to the definitions above.

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