Microfilters When a telephone line has been broadband-enabled, a micro-filter needs to be plugged into each telephone socket. Each microfilter has two connections, one for analog devices (telephone, fax, etc.) and the other for connecting to broadband. The function of the microfilter is to separate the signals of analog devices from the higher frequency ADSL broadband signals. We have suggested making a survey of all telephone sockets and connected analog devices (telephones, fax, etc) to determine the number of microfilters required and where they will be fitted. (see, e.g. http://www.adslguide.org.uk/guide/connections.asp) If one buys broadband hardware "packages" from Internet Providers, these sometimes include a certain number of microfilters. The prices of different microfilters vary over a wide range. Prices range from more than ten pounds down to as low as one pound for the Tehkal microfilter from ebuyer (together with a message about how to modify it.) And it's not clear whether performance will necessarily improve directly according to price - the more expensive filters should be the "active" type (including diodes) and more effective than the lower-priced "passive" filters. If you would like to see details of construction of different microfilters, go to the page: http://www.adslnation.com/support/filters.php |
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