HP 10BASE-T Guia do Utilizador descarregar pdf (Página 14)

1-8

Switching Hub Features

How the Hub Works

Switching Hub Features

How the Hub Works

The HP AdvanceStack Switching Hubs are multiport repeaters that conform

to the IEEE 802.3 repeater specification. Data signals coming into the hub

from any of its ports are automatically regenerated and transmitted to all the

other network ports on the same segment in the hub stack. The hub regener-

ates the data without interpreting the contents, so it can be used in either IEEE

802.3 or Ethernet networks and with any upper-level protocol.

The following illustration shows communication when there is no Manage-

ment Module in the stack.

If users are distributed on the different segments via a Management Module,

then data received on a segment is only transferred out the same segment.

Collision Detection

The hub performs collision detection. A collision occurs when two nodes try

to transmit at the same time. When the hub detects this, it stops repeating the

colliding transmissions and starts transmitting a jamming signal. The jamming

signal tells the transmitting nodes that a collision has occurred. The colliding

nodes then stop transmitting for a random amount of time before attempting

to retransmit the data. Once the collision condition is removed, the hub stops

transmitting the jamming signal and normal operation is resumed.

Data comes in Port 11

Example: John is connected to port 11 and transmits data out of his PC. Data is

repeated out of all ports in this stack because they are all on segment 1.

Hub A

Hub B

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 43 44

Sem comentários

HP 10BASE-T Guia do Utilizador Página 14