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HP Netelligent 2008 User Manual: Interconnecting Repeaters; Repeater Expansion Port

Hp netelligent 2008: user guide.
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3-6
Installing the Repeater

Interconnecting Repeaters

Up to ten repeaters can be interconnected to form one logical repeater that
supports up to 80 Ethernet ports for the 8-port repeater and up to 160 Ethernet
ports for the 16-port repeater. Each repeater can be isolated from the rest of the
repeaters to reside on its own segment. See the "Segmenting Repeaters" section
of this chapter.
Compaq's unique Extended Repeater Architecture (ERA) allows for greater
distances between interconnected repeaters (up to 250 feet, 76.22 meters total).
ERA provides both Ethernet connectivity and inter-repeater communication.
Inter-repeater communication is a management protocol where data is
transferred from one repeater to the next and then repeated until it reaches the
destination repeater. This minimizes signal reflection at extended distances and
also provides a stack order and status signal to indicate the physical bottom
repeater in the stack. ERA also provides automatic detection of powered down
repeaters so that signals will pass through (bypass) those repeaters.

Repeater Expansion Port

The repeater has two Repeater Expansion Ports: the IN port and the OUT port.
Repeaters are interconnected via these ports using a standard, eight-wire (four
twisted pair) Category 3 (or higher) UTP/STP repeater expansion cable that
ends in standard RJ-45 plugs. One 6-inch (15 cm) Category 3 expansion cable
is supplied with the repeater.
To connect one repeater to an adjacent repeater in the stack, connect the lower
repeater's RJ-45 EXPANSION OUT port to the upper repeater's EXPANSION
IN port, as show in Figure 3-7.

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