What is maximum length of CAT5e cable that HH3 can...

The wireless signal is weak in our home office in the garden so I installed a CAT5e cable to give me a LAN connection to the computer.  The cable is 30 m long and I have checked the connections (from the LAN connection lead into the router to the connection lead into the computer) with a suitable meter which gave me green lights throughout.  However there is no signal at the computer.  I have tried all 4 connections at the HH3. I have connected my laptop into the HH3 using the same lead that connects from the hub to the socket in the wall that connects to the CAT5e cable to the office and it works fine.  I take the laptop to the office and but there it says there is no signal.  According to BT website a CAT5e cable can be up to 100m and phone up to 150m.  I cannot find any way of contacting BT that gets me to someone who might know (I did try their "typing conversation", with someone telling me it was 10 m and then eventually admitting they did not know anything about networks!).
Is the HH3 not man enough for the job or is there something wrong with it and I need to use snail mail to write to Mr Warren Buckley to complain?

Maximum cable segment length:
According to the ANSI/TIA/EIA standard for category 5e copper cable (TIA/EIA 568-5-A), the maximum length for a cable segment is 100 meters (328 feet). If longer runs are required, the use of active hardware such as a repeater or switch is necessary.
I have a cable run of 50mtrs and it works no problem from a Homehub 2.
Are you using a patch cable or a crossover cable.Cables come in two flavors, straight through, also called a patch cable and a crossover cable. Normally when you connect Ethernet stuff like connecting a PC to a hub you would use a patch cable.
If you connect two like things together, PC to PC or Hub to Hub you need a crossover cable.

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