Do I Need A Micro Filter; Filters And Multi-Purpose Gateways - NetComm NB9 User Giude

Do I need a micro filter?
Micro filters are used to prevent interference between phones and fax machines, and your ADSL
service. If your ADSL-enabled phone line is being used with any equipment other than your ADSL
Modem then you will need to use one Micro filter for each phone device in use. Telephones and/or
facsimiles in other rooms that are using the same line will also require Microfilters. The following
diagram gives an example of connecting your ADSL Modem/ Router using a Microfilter. A suitable
Microfilter can be purchased from NetComm or your Service Provider, if required.
A central splitter may be installed with your ADSL service 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 on
each device.- Check with your ADSL or phone service provider if you are unsure as to whether a
splitter is installed at your premises.

Filters and Multi-purpose Gateways

The multi-purpose ADSL/VoIP gateway uses a different filter configuration to an ADSL modem/
router. With the NB9/NB9W, an in-line splitter is placed between a non-filtered telephone outlet
and the NB9/NB9W. One RJ11 cable is then connected from the splitter's 'Line' port TO the NB9/
NB9W LINE port. Another is connected from the splitters 'ADSL' port to the NB9/NB9W ADSL
port. This is to allow the 'pass-through' line to connect via the POTS if necessary.
If the premises into which the NB9/NB9W is to be used already has a central line-splitter installed,
then one line should be connected from the LINE port of the NB9/NB9W to an unfiltered, POTS
telephone point, and another line should be connected from the ADSL port to and ADSL-ready
telephone point.
8
YML790 Rev1
NB9/NB9W ADSL2+ VoIP Router