Enterasys csx400 Manuel De Montage
Chapter 2: About the CSX400
2-6
CyberSWITCH CSX400 and CSX400-DC Installation Guide
Inverse Multiplexing (IMUX)
Cabletron Systems Inverse Multiplexing (IMUX) feature provides enhanced throughput for users
by doing each of the following:
by doing each of the following:
•
The IMUX function evenly distributes a data packet stream from the LAN interface through the
two WAN interfaces on the CSX400. Since the data traffic is equally shared between the two
Full T1 interfaces, each with 1.5 Mbps throughput, the total throughput over the logical link is
3 Mbps, or 6 Mbps full-duplex operation with the optional hardware compression module
(CSX-COMP/ENCR) installed in the CSX400.
two WAN interfaces on the CSX400. Since the data traffic is equally shared between the two
Full T1 interfaces, each with 1.5 Mbps throughput, the total throughput over the logical link is
3 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 Point
Protocol (PPP) and a WAN Encapsulated Ethernet Frame Type to support data coherency on
both ends of the link.
Protocol (PPP) and a WAN Encapsulated Ethernet Frame Type to support data coherency on
both ends of the link.
•
Data packet streams received by the WAN Interfaces on the CSX400 at the other end of the
WAN link are then recombined, ordered, and transmitted to the Ethernet 1 interface.
WAN link are then recombined, ordered, and transmitted to the Ethernet 1 interface.
•
The IMUX function is fully configurable using QuickSET, which is discussed in the
QuickSET Configuration Guide.
QuickSET Configuration Guide.
HDLC
Cabletron Systems has provided the High-level Data Link Control (HDLC) protocol which is used
in conjunction with the Inverse Multiplexing (IMUX) feature and the WPIM-HDSL to conserve a
user’s WAN bandwidth between two Cabletron Systems products, over a point-to-point
connection. Cabletron Systems products such as the CSX400 must be in use on both ends of the
WAN link for these functions to work. The HDLC (RAW) protocol reduces the amount of
overhead information that needs to be contained within each data packet to direct it to its
destination. This decreased packet overhead provides the IMUX and HDSL functions with more
bandwidth to transfer user data.
in conjunction with the Inverse Multiplexing (IMUX) feature and the WPIM-HDSL to conserve a
user’s WAN bandwidth between two Cabletron Systems products, over a point-to-point
connection. Cabletron Systems products such as the CSX400 must be in use on both ends of the
WAN link for these functions to work. The HDLC (RAW) protocol reduces the amount of
overhead information that needs to be contained within each data packet to direct it to its
destination. This decreased packet overhead provides the IMUX and HDSL functions with more
bandwidth to transfer user data.
NOTE
Cabletron Systems products that support IMUX, such as the CSX400, must exist on
both ends of the WAN link for the IMUX function to work.
both ends of the WAN link for the IMUX function to work.
Both bridging and routing functions are disabled when using the IMUX function.