User manual 3COM SUPERSTACK II ENTRY HUB_24 PORT TP

[. . . ] 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. This unit operates under SELV conditions (Safety Extra Low Voltage) according to IEC 950, the conditions of which are maintained only if the equipment to which it is connected is also operational under SELV. [. . . ] The ports can be MDIX ports (to connect directly to DTE like the other ports), or MDI ports (to connect to other repeaters using a normal ‘straight through’ TP cable). Out MDIX In this position you can connect port 12 or 24 to a workstation or any other DTE using a normal ‘straight through’ TP cable. In this position you can connect port 12 or 24 to any MDIX port on another 10BASE-T repeater using a normal ‘straight through’ TP cable. If these checks do not identify the cause of a problem, it may be that the Entry Hub or the device connected to the port is faulty. 4 Transceiver Module STATUS LED In MDI If a Twisted Pair or Fiber Transceiver Module has been fitted, the LED behaves the same as the TP STATUS LEDs, see 3. 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. 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.
Rack or Wall Mounting The Entry Hub can be mounted in a 19 inch equipment rack, or wall-mounted using the Mounting Kit. 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. Use the two reduced height pads and two of the standard height pads if the unit is to be stacked on a SuperStack II unit of different dimensions — Line up the front of the units, and use the two standard height pads at the front (to fit the recess of the unit beneath) and use the two reduced height pads at the back. Spot Checks At frequent intervals you should visually check the Entry Hub. Regular checks can give you an early warning of a possible failure; any problems can then be attended to when there will be least effect on users. [. . . ] SOFTWARE: 3Com warrants that the software programs licensed from it will perform in substantial conformance to the program specifications therefor for a period of ninety (90) days from the date of purchase from 3Com or its Authorized Reseller. 3Com warrants the media containing software against failure during the warranty period. 3Com's sole obligation with respect to this express warranty shall be (at 3Com's discretion) to refund the purchase price paid by Customer for any defective software products, or to replace any defective media with software which substantially conforms to 3Com's applicable published specifications. Customer assumes responsibility for the selection of the appropriate applications program and associated reference materials. [. . . ]