HP 100BaseT Guide de l'utilisateur télécharger pdf (Page 30)

HP 100Base-T Hubs Installation and Reference Guide

1-10 Product Overview

Data Switching with the Switch Port Modules

Switching Technology

The Switch Port Modules that plug into the Expansion Slot on

the front panel of the AdvanceStack Hub-12TX/Hub-12TXM

use advanced switching techniques to provide a high-speed

network backbone. Each Switch Port Module acts as a two-port

Ethernet switch that segments the stack from the extended

network.

The module scans the destination address from the packet

header, searches the routing table provided for the incoming

port and forwards the packet only if required, often before fully

received. A learning function stores the address and corre-

sponding segment identifier of each incoming and outgoing

packet in a routing table. This information is subsequently

used to filter packets whose destination address is on the same

segment as the source address. This confines network traffic to

its respective domain, reducing the overall load on the network.

Configuration Options for the Switch Port Modules

The 10/100Base-TX and

100Base-FX media both support

full-duplex operation.

The Switch Port Modules can be connected to a subnetwork, or

directly to a server or key workstation, or to an isolated hub in

the stack. In addition to partitioning an overloaded network,

they provide a connection between legacy 10Base-T networks

and the newer generation 100Base-TX, and can be configured

to operate in either full-duplex or half-duplex data transfer

mode to support the interconnection requirements of other

high-speed devices.

These modules perform cut-through switching, which can direct

a packet according to the destination address scanned from the

packet header. This technique results in packet transmission at

near-zero latency.

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HP 100BaseT Guide de l'utilisateur Page 30