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CHAPTER 4: Operation
This chapter describes the LEDs and operating features of the 9-Port
Personal MiniHubs. The 9-Port Personal MiniHubs are fully compliant with
the Ethemet Version 2/IEEE 802.3 Repeater Specification for CSMA/CD
10-Mbps operation and will function accordingly.
4.1 LED Indicators
Power On (PWR) LED:
Shines GREEN to show functional DC power.
Link Status (LINK) LEDs:
9-Port Personal MiniHubs have a LINK LED for
each port, which shines GREEN when the MiniHub detects that a
10BASE-T segment is properly connected to that port. Each LINK LED will
turn OFF independently if either end of the segment’s cable comes loose or
if the MiniHub or the device at the other end loses power.
NOTE
When the rear port is physically uplinked (cabled) to another hub, the
LINK LED will normally be ON when the Up-Link switch is set to the
“
=
x
=
” position. If you isolate the MiniHub for full-bandwidth local
operation by moving the Up-Link switch to the “=== ” position, the LINK
LED will be OFF because the up-link is logically disabled.
Receive Packets (RX) LEDs:
The RX LEDs, one for each RJ-45 port, flicker
GREEN to show that data packets are being received from the segment
connected to that port. These LEDs provide reassurance of normal network
activity and help you diagnose abnormal activity.
4.2 Operating Features
Partitioning and Reconnection:
Personal MiniHubs will automatically
partition any port where 32 consecutive collisions occur or after 6.5 ms of
continuous transmissions. Network integrity is checked every 800 ms and
segment reconnection occurs after one 512-bit packet is transmitted without
an error.
4. Operation