ZyXEL P-663HN-51 User Guide - Page 53
WAN Setup, 5.1 WAN Overview, 5.1.1 VPI and VCI, 5.1.2 Multiplexing
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CHAPTER 5 WAN Setup 5.1 WAN Overview A WAN (Wide Area Network) is an outside connection to another network or the Internet. 5.1.1 VPI and VCI Be sure to use the correct Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) numbers assigned to you. 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. 5.1.2 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. 5.1.2.1 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. 5.1.2.2 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. P-663HN-51 User's Guide 53