GarrettCom Magnum ST80 manual Functional Operation, Use of LED Indicators

Stackable Personal Hubs Installation and User Guide (04/01)

4.0OPERATION

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.

4.1Functional Operation, Use of LED Indicators

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.

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