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Magnum H80B and H80P Personal Hubs User Guide (07/95)
GARRETT
22
4.0 OPERATION
This section details the various operational features of
Magnum Personal Hubs, including a description of the LED
indicators. All Personal Hubs are fully compliant with the Ethernet
Version 2/IEEE 802.3 Repeater Specification for CSMA/CD 10
Mbps operation and will function accordingly.
4.1 Functional Operation, Use of LED Indicators
Power On (PWR) LED
: Illuminates GREEN to show functional
DC power.
Link Status (LINK) LED (per port):
Illuminates GREEN when
there is proper connectivity on the port's 10BASE-T network
segment. Each LINK LED will turn off independently in the event
that connectivity is lost between the ends of that segment or a loss of
power occurs in the segment at either end.
Note: When the switchable port is wired for up-link to another
hub, the LINK LED will normally be on when the up-link
switch is set to the X position. With the up-link switch off
(= position), the LINK LED is off as the up-link is
disabled. This permits local operation of the Personal
Hub with full bandwidth.
Receive Packets (RX) LED (per port):
Illuminates GREEN
intermittently to indicate that data is being received from the
segment. This provides a visual indication of network activity for re-
assurance of normal operation, and is helpful in troubleshooting.
Partitioning and Re-connection:
Personal Hubs 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 re-connection occurs after one 512-bit packet is
transmitted without an error.