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This section details the various
operational features of the 10BASE-
T MiniHub, including a description
of the LED indicators. The 10BASE-
T MiniHub is fully compliant with
the Ethernet Version 2/IEEE 802.3
repeater specification for CSMA/CD
10 Mbps operation and will function
accordingly.
• Power On (PWR) LED—lights
green to show functional DC
power.
• Link Status (Link) LED—The
10BASE-T MiniHub includes a
Link LED for each port. It
indicates by illuminating in
green that there is proper
connectivity on its 10BASE-T
network segment. The Link LED
will turn off if connectivity is lost
between the ends of the segment
or a loss of power occurs in the
unit at either end.
• Receive Packets (RX) LED—The
RX LEDs, one for each
RJ-45 port, illuminate
intermittently in green to
indicate that data packets are
being received from the
segment. This provides a visual
indication of network activity,
and is also helpful in
troubleshooting.
4. Operation
• Partitioning and re-connection—
• Preamble regeneration—The
• Collisions—When carrier is
• Fragment extension—The
CHAPTER 4: Operation
The 10BASE-T MiniHub will
automatically partition any port
where 32 consecutive collisions
occur or after 6.5 milliseconds of
continuous transmissions.
Network integrity is checked
every 800 milliseconds and
segment re-connection occurs
after one 512-bit packet is
transmitted without an error.
10BASE-T MiniHub will add bits
to the preamble so that the
output packet contains at a
minimum a 64-bit preamble
per the Ethernet standard.
detected simultaneously on
multiple ports, a jam pattern is
generated on each port to create
a collision condition. When a
collision signal from one port
is detected, it generates a jam
pattern to the other ports.
10BASE-T MiniHub will
automatically add bits to a
received data packet of less than
96 bits (a "fragment") so that the
minimum output packet to the
other port is 96 bits long.
17
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