Operation; Functional Operation, Use Of Led Indicators - GarrettCom magnum Installation And User Manual

Magnum Personal Hubs
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 10Mbps 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 proper
connectivity on the 10BASE-T network segment is established. Each LINK LED
will turn off independently if connectivity or power is lost on the port's twisted pair
segment.
Note: When the switchable port is wired for up-link to another
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
bandwidth.
Receive Packets (RX) LED (per port): Illuminates intermittently in GREEN to
indicate that data packets are being received from the segment. This provides a
visual indication of network activity for re-assurance of normal operation, and is
also useful in troubleshooting.
Note: Blinking indicates activity. The rate at which the RX LED blinks is
associated with the data transfer intensity on some models, and is a fixed
rate on other models.
Partitioning and Re-connection: Personal Hubs will automatically partition a
port when 32 consecutive collisions occur or after 6.5 ms of continuous
transmission. Network integrity is checked every 800 ms and segment re-
connection occurs after one 512-bit packet is transmitted without an error.
Preamble Regeneration: Personal Hubs add bits to the preamble so that the output
packet contains a minimum 64-bit preamble per the Ethernet standard.
Collisions: When carrier is 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 other ports.
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Installation and User Guide (09/01)
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