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In 2008 BT came up with a new idea – the “iPlate” or Interstitial Plate (from mid 2009 also known as BT Broadband Accelerator) which fits between the old type NTE5A frontplate and the backplate
The pdf version of the instructions can be found here
The iplate is believed to comprise a choke on the bellwire (3) plus some sort of common mode choke on the speech wires (2 and 5) to reduce RF interference on the speech wires as well as the bellwire.
In the third photo, the bellwire filter is the small black cylindrical component on the right, and the common mode choke is the square iron component on the left with the copper wire windings on one side.
Thanks to James G. who wrote to me and sent photographs and the BT instruction sheet . The pics seem to confirm that the BT version has the extra common mode choke on the voice wires to increase filtering over-and-above the bellwire isolation.
In trials, James found that with the straight Bellwire disconnection, broadband profile speed went from
2000kbps to 6000kbps. The use of the iplate (with the extra common mode choke) made similar improvement but no more than the original bellwire fix.
However for people who are nervous of pulling out wires, the iPlate is a cost effective means (now available at around £9 in the BT shop) of bringing your system up to the standard of the new Openreach NTE5A (2007) master sockets.
| BT iPlate / BT Broadband Accelerator: Available from the BT Shop: iPlate at BT Shop |
A BT Wholesale document had these two interesting pages regarding the bellwire problem, and a summary, both in a presentation announcing the iPlate to their retail partners
However the iPlate only isolates bellwires that connect directly to the master such as hard extensions or extension reels plugged into the front of the master.
Because ADSL filters recreate the bell capacitors locally to the phone they also potentially recreate the bellwire problem anywhere you have a filter with a 3-wire cable connected to it. So keep the wires that connect your phones to the filters away from TVs and mains cables and never plug flexible extensions or extension reels between the phone and a filter.
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