GarrettCom Magnum ST80 用户手册

Stackable Personal Hubs 

 Installation and User Guide   (04/01)

 
 

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This section details the various operational features of Magnum ST80 Personal 

Hubs, including a description of the LED indicators.  Stackable 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. 

Power On (PWR) LED:  Illuminates GREEN to show proper DC power. 

Collision (COL) LED: Illuminates YELLOW whenever a transmit collision 

occurs on a port within the hub. 

Link Status and Transmit (LINK/TX) LED: Per port LEDs detect and 

indicate by illuminating GREEN that there is proper connectivity on a 10BASE-

T network segment.  The LED will turn off intermittently when the port 

transmits a packet.  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, the LED is 

turned off. 

 

Note:  When port 8 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 (“==”), LINK is off as the up-link is disabled. This permits 

local operation of the ST80 Personal Hub with full bandwidth. 

Polarity and Receive (POL/RX) LED:  Per port LEDs intermittently 

illuminate 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 helpful in troubleshooting.  If reversed polarity 

is detected, the LED becomes steady GREEN (the ST80 automatically 

compensates for the reversed polarity and resumes normal operation). 

Partitioning and Re-connection:  Stackable Personal Hubs will automatically 

partition any port where 32 consecutive collisions or 6.5 ms of continuous 

transmissions occurs.  Network integrity is checked every 800 ms and segment 

re-connection occurs after one 512-bit packet is transmitted without error.  The 

status LEDs of a partitioned port indicate the partitioned state by blinking 

alternately.