HP 100BaseT Podręcznik Użytkownika Pobierz pdf (Strona 43)

HP 100Base-T Hubs Installation and Reference Guide

Installing the System 2-11

address is in the local collision domain, or forwarded if the

destination is in a remote collision domain).

Note: Devices connected to the Switch Port Module exist in a separate

collision domain, and cannot be controlled by a management agent in

the stack.

Switching Functions -

These modules also provide functions

commonly found on an Ethernet switch. The scheme used to

process data packets is automatically adjusted to optimize

system performance. Cut-through, fragment-free cut-through,

or store-and-forward processing may be used depending on the

current error rate. (Refer to

'DWD6ZLWFKLQJZLWKWKH6ZLWFK3RUW

0RGXOHVLQ

Chapter 1 for a detailed discussion of these processing

methods.)

In addition to the features listed above, the Switch Port

Modules also use back pressure to eliminate frame loss when its

port buffers fill, by “slowing” the traffic received from end

stations connected directly to this port. This prevents packets

being dropped due to full buffers.

Interconnecting Stack Segments - Any hub can be completely

isolated from others in the stack (an isolated collision domain).

Only when the hub is attached to the stack’s collision domain

can it communicate with all hubs in the stack. (Refer to the

discussion on

&RQILJXULQJ+XE3DUDPHWHUV in Chapter 4.)

The best way to interconnect isolated hubs in a stack is to

connect a 10/100TX Switch Port Module on one hub to a port

on an isolated hub, using an MDI to MDI-X connection.

Switch Port Modules can be used in this way to interconnect all

isolated hubs in a stack. Refer to Chapter 3 for various

interconnection examples.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 156 157

Brak uwag

HP 100BaseT Podręcznik Użytkownika Strona 43