Prestige 660RU-Tx Series User’s Guide

Figure 73 Menu 11 Remote Node Setup

Menu 11 - Remote Node Setup

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18.2.2 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.

18.2.2.1 Scenario 1: One VC, Multiple Protocols

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

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

Selecting RFC-1483encapsulation with VC-basedmultiplexing 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.

18.2.2.3 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-basedmultiplexing.

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Chapter 18 Remote Node Configuration