ZyXEL Communications 792H - Manual (Page 272)

Prestige 791R G.SHDSL Router
24-2 Remote Node TCP/IP Configuration
Figure 24-1 Remote Node Setup
24.2.1 Encapsulation and Multiplexing Scenarios
For Internet access you should use the encapsulation and multiplexing methods used by your ISP. For
LAN-to-LAN applications, for example, between a branch office and corporate headquarters, prior
agreement on methods is necessary because encapsulation and multiplexing cannot be automatically
determined. What method(s) you use 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.
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.
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.
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.
Menu 11 - Remote Node Setup
1. MyISP (ISP, SUA)
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