Cabletron Systems HSIM-W6 Guía de instalación descargar pdf (Pagina 16)

Chapter 2: About the HSIM-W84

2-4 HSIM-W84 Installation Guide

Inverse Multiplexing

Cabletron Systems Inverse Multiplexing (IMUX) feature provides enhanced throughput for users

by doing each of the following:

• The IMUX function evenly distributes a data packet stream from the LAN interface through the

two, three, or four Full T1 WAN interfaces on the HSIM-W84. Since the data trafﬁc is equally

shared between the interfaces, each with 1.5 Mbps throughput, the total throughput over the

logical link is 3, 4.5, or 6 Mbps full-duplex. When running IMUX, the T1 interfaces that are not

included in the IMUX group cannot be used.

• The IMUX function passes packet sequence information over the WAN using the Point-to-Point

Protocol (PPP) to support data coherency on both ends of the link.

• Data packet streams received by the WAN interfaces on the other end of the WAN link are then

recombined, ordered, and transmitted to the LAN interface.

• The IMUX function is fully conﬁgurable using QuickSET, which is discussed in the QuickSET

Configuration Guide, and the MIB Navigator command set discussed in the Local

Management Guide for CSX400, HSIM-W6, and HSIM-W84.

Firmware Data Compression

The STAC Electronics Stacker LZS Compression algorithm provides up to 4:1 ﬁrmware data

compression for the HSIM-W84 over PPP and Frame Relay. Firmware data compression is

supported in software on each T1 WAN interface for line speeds of up to 256 Kbps per interface,

which is equivalent to four DS0 channels. To use data compression, compatible equipment, (such

as the HSIM-W84, HSIM-W6, CSX400, and CSX200 or other vendors’ equipment which

conforms to the applicable standards), must be in use at both ends of the WAN link. This ﬁrmware

method of data compression is used as the default if the hardware compression module is not

installed.

NOTE

Cabletron Systems products that support Inverse Multiplexing (IMUX), such as the

HSIM-W84, HSIM-W6, CSX400, and CSX200, must exist on both ends of the WAN

link for the IMUX function to work.

Both bridging and routing functions are disabled when using the IMUX function.

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Cabletron Systems HSIM-W6 Guía de instalación Pagina 16