DSL devices such as DSL modems and routers share a common telephone line with conventional analogue telephones, fax machines answering machines and other analogue telephony devices.

It is necessary to install a low pass filter to block the higher frequency channels used to deliver DSL services for every telephone or POTS (Plain Old Telephone Services) devices that share the line with the ADSL equipment.

Designed to exceed the the BT SIN 346 v2.2 guidelines for UK microfilters the Z-420 offers complete compatibility with BT services such as CLI (Caller ID).

The Z-420UK-A is designed for maximum compatibility with even the most complex telephone equipment.

Fully compatible with DECT cordless phones and PABX systems.