HP 100BaseT Guide de l'utilisateur télécharger pdf (Page 111)

HP 100Base-T Hubs Installation and Reference Guide

Hardware Reference 5-7

pseudo-random wait period. Because wait periods differ among

devices, successive collisions become increasingly improbable.

The

&ROOLVLRQ LEDs assist the network manager in monitoring

the percentage of packet collisions occurring relative to the total

packets received by the stack (or hub, if isolated). Similar to

8WLOL]DWLRQ LEDs, the &ROOLVLRQ LEDs have five numbers

representing collision percentage. When collisions reach a level

marked on the LED display, the corresponding LED lights up.

For example, if packet collisions reach 1%, the LED labeled 1

will light up. However, if collisions go beyond 1% (e.g., 15%),

the LED labeled 15

and all the other LEDs before it (i.e., 1, 3,

5, and 10) will also light up in rapid succession.

When more than 64 consecutive collisions occur on the cable

segment connected to a port, that port is automatically partitioned by

the hub. The hub automatically reconnects this port when a data

packet longer than 512 bits (normal) is transmitted or received by the

partitioned port without collision. This applies to all STP station ports

and the cascade port.

Port Status Indicators

There are 12 or 24 pairs of port status indicators. Each pair

consists of a

/LQN7UDIILF LED (in the bottom row) and

3DUWLWLRQ'LVDEOH LED (in the top row). The last pair displays status

for both the 12MDI-X/24MDI-X and 12MDI/24MDI port,

either of which is currently in use. Also note that port status

for the Switch Port Module is displayed directly on the module

as described in the section on

6ZLWFK3RUW0RGXOH,QGLFDWRU earlier in

this chapter.

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HP 100BaseT Guide de l'utilisateur Page 111