Question about 3Com OfficeConnect Dual Speed Networking Hub

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Have a 3Com Office Connect Dual Speed Hub 8 that Flashes all lights on and off consistently. After unplugging and restart it does nothing but flash all lights.

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Mine did that and it required a return for repair, 3Com has a great warranty program but you must contact them to schedule the return.
www.3com.com/repair

Posted on Jul 30, 2009

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  • Unplug the printer cable from the computer.
  • Unistall the printer drivers from Device manager and also unistall the all the printer appications
  • restart the computer
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  • after installing drivers and software it will ask you to connect the printer.
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3com 8 port hub not connecting to 2nd pc


Be sure that when you say its a hub that is indeed a layer 1 device which is just passing the signal and data along to all ports. Be sure to check the cable on the second device. At this point it must a straight cable you use to connect the PCs to the Hub. PCs transmit on pins 1 & 2 and Receive on 3 & 6. Hubs are the opposite. So a crossover will not work. You need PC pin 1 & 2 Tx to Hub Pin 1 & 2 Rx and over to PC pin 3 & 6 Rx to Hub pin 3 and 6 Tx. Tx = transmit and Rx = Receive. Also assign an IP address on each machine that is in the same subnet as each other. Such as PC1 192.168.1.100 mask 255.255.255.0 and PC2 IP address as 192.168.1.101 Subnet Mask 255.255.255.0 This way the 192.168.1 is the same for 8 PCs and the only change is the last number (octet). Also keep the speeds at either 10/100/1000 what ever the product is rated for but always keep the duplex half. Half is good because on a layer 1 hub, everyone is broadcasting at the same time. So you have to have half of all the ports listening at all times.

I hope this helps. My advice is to buy a layer 2 switch.

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Here is the link tothe Officeconnect Hub8 (PN 3C16700):

http://support.3com.com/infodeli/tools/hubs/off-con/3c16700/manual.a03/dua1670_0aaa04.pdf

Thisdevice is unmanagable meaning you can not define addressing on hub nor can you configure routing on the hub.

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Maybe a problem with 10/100 or Full/half duplex settings? Try changing them

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1 Answer

Anyone seen ths before?i


when it flashes it usily means its connected if it dosent work at all you should get a new hub

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