ZyXEL Communications 642R Series Vpi & Vci, Multiplexing, Encapsulation, VC-based multiplexing

Prestige 642R Series ADSL Router

	space bar to enable IP Multicasting or select None to disable it.
IP Policies	Create policies using SMT Menu 25 (see the IP Policy Routing
	chapter in Part 3) and apply them on the Prestige LAN interface
	here. You can apply up to four IP Policy sets (from twelve) by
	entering their numbers here separated by commas, e.g., 2, 4, 7, 9.
Edit IP Alias	The Prestige supports three logical LAN interfaces via its single	Yes
	physical Ethernet interface with the Prestige itself as the gateway for	No (default)
	each LAN network. Press the [SPACEBAR] to toggle No to Yes,
	then press [ENTER] to bring you to menu 3.2.1

When you have completed this menu, press [ENTER] at the prompt [Press ENTER to Confirm…] to save your configuration, or press [ESC] at any time to cancel.

The following terminology may seem a little overwhelming at first to new users of broadband technology. Relax! This information should be either pre-configured on your Prestige or supplied by your ISP or telephone company. Think of them as the equivalent of “telephone numbers” on traditional dial-up PSTN and ISDN modems and routers.

3.9VPI & VCI

Be sure to use the correct Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) numbers supplied by the telephone company. The valid range for the VPI is 1 to 255 and for the VCI is 32 to 65535 (1 to 31 is reserved for local management of ATM traffic). Please see the Appendices for more information.

3.10 Multiplexing

There are two conventions to identify what protocols the virtual circuit (VC) is carrying. Be sure to use the multiplexing method required by your ISP.

3.10.1 VC-based multiplexing

In this case, by prior mutual agreement, each protocol is assigned to a specific virtual circuit, e.g., VC1 carries IP, VC2 carries IPX, etc. VC-based multiplexing may be dominant in environments where dynamic creation of large numbers of ATM VCs is fast and economical.

3.10.2 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, e.g., if charging heavily depends on the number of simultaneous VCs.

3.11 Encapsulation

Be sure to use the encapsulation method required by your ISP. The Prestige supports the following methods.

Internet Access 3-9