Nortel Networks NB5PLUS4/W User Manual

Do I need a Micro filter?  

Micro filters are used to prevent common telephone equipment, such as phones, 

answering machines and fax machines, from interfering with your ADSL service.  If 

your ADSL enabled phone line is being used with any other equipment other than 

your ADSL Modem then you will need to use one Micro filter for each phone device. 

Splitters may be installed when your ADSL line is installed or when your current 

phone line is upgraded to ADSL.  If your telephone line is already split you will not 

need to use a Microfilter - check with your ADSL service provider if you are unsure.

Each micro filter is connected in-line with your telephone or fax machine so that all 

signals pass through it.   Telephones and/or facsimiles in other rooms that are using 

the same extension will also require Microfilters. The following diagram gives an 

example of connecting your ADSL Modem/Router using a Microfilter.