Cabletron Systems CyberSWITCH CSX400 Installation Manual

Also see for CyberSWITCH CSX400: Setup guide Configuration guide User guide User guide User guide

Contents

Chapter 2: About the CSX4002-6CyberSWITCH CSX400 and CSX400-DC Installation GuideInverse Multiplexing (IMUX)Cabletron Systems Inverse Multiplexing (IMUX) feature provides enhanced throughput for usersby doing each of the following:• The IMUX function evenly distributes a data packet stream from the LAN interface through thetwo WAN interfaces on the CSX400. Since the data traffic is equally shared between the twoFull T1 interfaces, each with 1.5 Mbps throughput, the total throughput over the logical link is3 Mbps, or 6 Mbps full-duplex operation with the optional hardware compression module(CSX-COMP/ENCR) installed in the CSX400.• The IMUX function passes packet sequence information over the WAN using the Point-to PointProtocol (PPP) and a WAN Encapsulated Ethernet Frame Type to support data coherency onboth ends of the link.• Data packet streams received by the WAN Interfaces on the CSX400 at the other end of theWAN link are then recombined, ordered, and transmitted to the Ethernet 1 interface.• The IMUX function is fully configurable using QuickSET, which is discussed in theQuickSET Configuration Guide.HDLCCabletron Systems has provided the High-level Data Link Control (HDLC) protocol which is usedin conjunction with the Inverse Multiplexing (IMUX) feature and the WPIM-HDSL to conserve auser’s WAN bandwidth between two Cabletron Systems products, over a point-to-pointconnection. Cabletron Systems products such as the CSX400 must be in use on both ends of theWAN link for these functions to work. The HDLC (RAW) protocol reduces the amount ofoverhead information that needs to be contained within each data packet to direct it to itsdestination. This decreased packet overhead provides the IMUX and HDSL functions with morebandwidth to transfer user data.NOTECabletron Systems products that support IMUX, such as the CSX400, must exist onboth ends of the WAN link for the IMUX function to work.Both bridging and routing functions are disabled when using the IMUX function.