The BT Home Hub 3 (HH3) can be used as a secondary Wireless Access Point (WAP). This means adding a second wireless network onto you existing (primary) wireless hub/router. This allows the HH3 to be placed (using a wired connection) at the other end of your house or garden, providing improved Wi-Fi coverage. Devices connected to this secondary wireless network will appear to be connected to your primary hub/router and will have local area network and Internet access.
HH3 Configuration
Before you can use a BT HH3 as a WAP there are a few configuration changes required:
To configure your HH3, remove all cables apart from the power supply. Using a standard Ethernet cable (RJ45 to RJ45 connector), connect your computer to one of four ports (labelled 1, 2, 3 & 4).
Once connected, your computer should be allocated a valid IP address, using the DHCP service on the HH3. You will not have access to the Internet at this point.
Using a web browser, open the following URL: http://192.168.1.254/. This is the address of the web interface of the BT HH3.
This should now show the HH3 management interface.
Login as admin to the HH3.
Note: For each of the changes below, you must ‘apply’ the changes before they will take effect.
SSID, Security & Password
This is found under ‘Settings’ : ‘Wireless’.
Set your chosen SSID for this secondary WAP, e.g. we called ours 'Patio'. This is the name of the network as seen by your devices. Note that this should be different to the one used on your primary router.
Leave the security set to WPA & WPA2 and then change the WAP password to something secure. If you are going to use this WAP for guests, you can also make it something memorable. This is the password you will be asked for, when you try to connect a device to this secondary wireless network.
It is possible to use the same SSID and password on both your primary and secondary WAP but, the connection and authentication behaviour of devices can be unpredictable if this configuration is used. If you do this, you should ensure the primary and secondary WAPs operate on different channels.
This is found under ‘Settings’ : ‘Wireless’.
By default, BT Home Hubs use an automatic method to select the best Wi-Fi channel to use. Whilst this makes things easy for users, it doesn’t work well in all environments and is not desirable when using a secondary WAP.
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Choosing the best channel to use is not obvious as there are many external factors that can affect Wi-Fi. This includes other nearby networks and interference from electrical devices in the home.
I use an Android app called Wi-Fi Analyzer as a tool to help determine which channels are best to use: https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer&hl=en
The process is basically one of trial and error though, so try different channels to see which work best. It is preferable to use channels 1, 6 or 11 as the frequency bands used have no overlap. WAPs using the same channel will share the bandwidth and this is preferable to a partial overlap of channels and the associated interference.
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Ensure the Wi-Fi channel is set to a fixed channel and is not using 'automatic' channel selection. You should also configure your primary router/hub to also not use automatic channel selection.
802.11.x
This is found under ‘Settings’ : ‘Wireless’.
Set the HH3 to use 802.11n only. This prevents older devices connecting and reducing wireless performance. Leave it set at 802.11b/g/n if you want to connect devices that use older Wi-Fi technology.
IP Address
This is found under ‘Settings’ : ‘Home Network’ : ‘IP Addresses’.
Change the IP address used by the HH3 to a free (fixed) IP address on your home network, e.g. 192.168.1.240. This is done because 192.168.1.254 and 192.168.1.255 will be used by your primary hub/router.
DHCP
This is found under ‘Settings’ : ‘Home Network’ : ‘IP Addresses’.
In the advanced settings, turn off the DHCP service on the HH3. The DHCP service on your primary router/hub will now be used to assign IP addresses to your devices (unless they have a fixed IP address).
3-Port Switch
As well as wireless connectivity, the other 3 ports on the HH3 can be used to connect wired devices. In this respect it is acting as a 3-port switch.
Connecting the HH3
Note: You must use port 1 for the HH3 to work correctly as a WAP and switch.
Ethernet Cable
The easiest way to connect this new HH3 WAP to your current router is using a standard Ethernet cable from a spare port on your primary router, to the port marked '1' on the HH3.
It is possible to use ‘powerline’ adapters, which use the mains power network in your home to carry data. This approach introduces another networking technology, along with its associated reliability and performance issues though. I do not recommend this approach but, I realise that in some cases it is the only available option.
It has been shown that BT Vision will work when connected to the HH3 using this technology but, I have yet to prove that multicast-IP TV channels work when this configuration is used.
Fibre Optic Ethernet
For longer (e.g. 100m+) distances, it is possible to use an ‘Ethernet over fibre’ kit, which presents an Ethernet port at each end but uses optical fibre between two adapters. The HH3 has a USB port which can be used to power the adapter at the HH3 end.
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