Multiplexing; Vpi And Vci; Wizard Setup Configuration: First Screen - Telkom ADSL 5100 Instruction Manual

3.2.4 RFC 1483
RFC 1483 describes two methods for Multiprotocol Encapsulation over ATM Adaptation Layer 5
(AAL5). The first method allows multiplexing of multiple protocols over a single ATM virtual circuit
(LLC-based multiplexing) and the second method assumes that each protocol is carried over a
separate ATM virtual circuit (VC-based multiplexing). Please refer to the RFC for more detailed
information.

3.3 Multiplexing

There are two conventions to identify what protocols the virtual circuit (VC) is carrying. Currently
Telkom only use LLC multiplexing (Par. 3.3.2)
3.3.1 VC-based Multiplexing
In this case, by prior mutual agreement, each protocol is assigned to a specific virtual circuit; for
example, VC1 carries IP, etc. VC-based multiplexing may be dominant in environments where
dynamic creation of large numbers of ATM VCs is fast and economical.
3.3.2 LLC-based Multiplexing
In this case one VC carries multiple protocols with protocol identifying information being contained
in each packet header. Despite the extra bandwidth and processing overhead, this method may
be advantageous if it is not practical to have a separate VC for each carried protocol, for example,
if charging heavily depends on the number of simultaneous VCs.

3.4 VPI and VCI

Be sure to use the correct Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI)
numbers assigned to you. For Internet over ADSL use VPI – 8 & VCI – 35. The valid range for the
VPI is 0 to 255 and for the VCI is 32 to 65535 (0 to 31 is reserved for local management of ATM
traffic). Please see the appendix for more information.

3.5 Wizard Setup Configuration: First Screen

On the Main Menu screen click Wizard Setup to display the first wizard screen.
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