User manual 3COM 3C16441

[. . . ] S If installing the unit in a stack with SuperStack II units, it must be installed below the narrower units. Connect the unit to an earthed power supply to ensure compliance with safety standards. It is essential that the socket outlet is near to the unit and is accessible. You can only disconnect the unit by removing the appliance coupler from the unit. [. . . ] For other Transceiver Modules, the LED shows these states: Green Flashing green Off Transceiver Module fitted correctly and not partitioned. A Transceiver Module port connected to a coaxial cable segment may partition if the segment is incorrectly terminated. The Transceiver Module port may partition if the SQE test pulse is enabled on its transceiver. SQE test should be disabled on transceivers used to connect 802. To connect two Entry Hubs, connect port 12 or 24 on unit 1 to any port on unit 2. Ensure that the MDI switch on unit 1 is IN (MDI) and that if port 12 or 24 is used on unit 2, the MDI switch is OUT (MDIX). I 5 Packet LED The Packet LED flashes green whenever a packet is received on one of the twisted pair ports or the Transceiver Module port. If this LED does not flash, there are no packets being received by the unit. If the unit is receiving packets but the LED does not flash, the LED has failed. 6 Collision LED The Collision LED flashes yellow when a packet collision has been detected on a segment connected to one of the twisted pair ports or the Transceiver Module port. The probability of collisions increases during heavy activity on the network. To install a Transceiver Module, refer to the guide that accompanies it. If you subsequently remove the Transceiver Module, you must replace the blanking plate to aid the circulation of cooling air and prevent the entry of dust and debris.
Rack or Wall Mounting The Entry Hub can be mounted in a 19 inch equipment rack, or wall-mounted using the Mounting Kit. see “Mounting Kit Instructions”. CAUTION: Do not remove the Transceiver Module blanking plate while the hub is connected to a power source. Power Up Use the following sequence to power up the Entry Hub: s s Check the network connections and cables. Connect the power supply cable to the appropriate power socket on the rear panel of the unit, see 8 or 9. Connect the plug to the power supply outlet socket and switch on the power supply at the socket. If you are using a 3Com Redundant Power System, ensure that it is switched on. 11 Self-adhesive Pads The Entry Hub is supplied with four standard height and two reduced height self-adhesive rubber pads. Usage of the feet depends on where the Entry Hub is placed: s s Use the four standard height pads if the unit is to be placed on a flat surface or stacked with another SuperStack II product of the same dimensions. [. . . ] Customer assumes responsibility for the selection of the appropriate applications program and associated reference materials. 3Com makes no warranty or representation that its software products will work in combination with any hardware or applications software products provided by third parties, that the operation of the software products will be uninterrupted or error free, or that all defects in the software products will be corrected. For any third party products listed in the 3Com software product documentation or specifications as being compatible, 3Com will make reasonable efforts to provide compatibility, except where the non-compatibility is caused by a "bug" or defect in the third party's product. ELECTRO-MAGNETIC COMPATABILITY FCC Statement This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. [. . . ]