Back of the Hub
Expansion Slot
The Expansion Slot is used to add an HP Ethernet SNMP Module
(HP J2603A or B). See the “Optional Accessories” section later in this
chapter for more information on the HP Ethernet SNMP Module.
Redundant Power Supply Connector
The back of the Hub-24 and Hub-48 has a Redundant Power Supply
(RPS) connector to add the HP J2962A Redundant Power Supply.
How the Hubs Work
The HP AdvanceStack 10Base-T 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 hub network ports. The hub regenerates 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.
Collision Detection
The hub also 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.
Hub Reference
Hub Reference
3-5
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