GarrettCom Magnum ST80 User Manual

Page 24

Stackable Personal Hubs

Installation and User Guide (04/01)

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4.0 OPERATION

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.

4.1 Functional

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.