Encapsulation And Multiplexing Scenarios; Scenario 1: One Vc, Multiple Protocols; Scenario 2: One Vc, One Protocol (Ip); Scenario 3: Multiple Vcs - ZyXEL Communications ADSL 2+ Gateway P-660HW-T1 User Manual

P-660H/HW/W-T Series User' Guide

Figure 124 Menu 11 Remote Node Setup

24.2.2 Encapsulation and Multiplexing Scenarios

For Internet access you should use the encapsulation and multiplexing methods used by your
ISP. Consult your telephone company for information on encapsulation and multiplexing
methods for LAN-to-LAN applications, for example between a branch office and corporate
headquarters. There must be prior agreement on encapsulation and multiplexing methods
because they cannot be automatically determined. What method(s) you use also depends on
how many VCs you have and how many different network protocols you need. The extra
overhead that ENET ENCAP encapsulation entails makes it a poor choice in a LAN-to-LAN
application. Here are some examples of more suitable combinations in such an application.

24.2.2.1 Scenario 1: One VC, Multiple Protocols

PPPoA (RFC-2364) encapsulation with VC-based multiplexing is the best combination
because no extra protocol identifying headers are needed. The PPP protocol already contains
this information.

24.2.2.2 Scenario 2: One VC, One Protocol (IP)

Selecting RFC-1483 encapsulation with VC-based multiplexing requires the least amount of
overhead (0 octets). However, if there is a potential need for multiple protocol support in the
future, it may be safer to select PPPoA encapsulation instead of RFC-1483, so you do not
need to reconfigure either computer later.

24.2.2.3 Scenario 3: Multiple VCs

If you have an equal number (or more) of VCs than the number of protocols, then select RFC-
1483 encapsulation and VC-based multiplexing.
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Menu 11 - Remote Node Setup
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Chapter 24 Remote Node Configuration