DSL filter overcomes capacitance limits

Edited by the Electronicstalk editorial team Nov 19, 2004

Pulse has introduced a new dynamic customer premises equipment (CPE) filter designed to improve digital subscriber line (DSL) broadband services in Europe.

Pulse has introduced a new dynamic customer premises equipment (CPE) filter designed to improve digital subscriber line (DSL) broadband services in Europe.

The Excelsus Z-Blocker Z-471TJA45 patented filter provides the highest possible voice quality and data rates for DSL broadband subscribers using three or more filters on the same phone line.

It can be used in Europe, Australia, South Africa, or any region requiring an ETSI POTS filter.

The Z-471TJA45 dynamically activates only when the phone is in use, minimising capacitance.

Whereas capacitance can prevent Caller ID (CID) from functioning after several filters are installed, the Z-471TJA45 keeps CID working with up to ten filters installed.

These filters also effectively block radio-frequency (RF) interference from cordless phones and other wireless sources, enabling uninterrupted video/audio streaming and games.

"With conventional DSL phone filters, each additional filter degrades voice quality, CID performance, digital subscriber line data rates and other services", explained Millard Schewe, Marketing Manager of the Excelsus product group.

"The Z-471TJA45 eliminates interference between DSL and plain old telephone service, allows a clear signal, and enables CID when you have multiple filters".

"I know of no other device that gives DSL subscribers such high performance with more than three filters".

The Z-471TJA45 can be mixed and matched with up to four conventional, nondynamic filters with no need to replace the original ones.

It can also be used when only one or two phone jacks are in use.

Up to ten Z-471TJA45 filters can be connected to one line with no noticeable performance degradation.

The dynamic filters meet the demanding ETSI TS 101 952-1-5 performance requirements for distributed filters, and are compatible with multiple types of DSL including ADSL Full Rate (ITU-T G.992.1), ADSL G.Lite (ITU-T G.992.2), ADSL2 (ITU-T G.992.3 and.4), ADSL2+ (ITU-T G.992.5 in analogue mode), ADSL2++, and VDSL (ITU-T G.993.1).

The Z-471TJA45 filter is designed to be installed into every telephone jack in the DSL subscriber's premises that contains voice-band equipment devices, including corded/cordless telephones, answering machines, fax machines, 56Kbit/s and lower-rate modems, automatic diallers and recorder connectors.

A DSL convenience jack is provided for connecting a DSL modem or home phone line network (HPN) device.

This means both a phone device and a DSL modem can be connected to a single phone jack, enabling easy broadband access.

For RJ11 installations, the Z-471TJA45 includes RJ45-to-RJ11 adapter inserts for the phone, line, and DSL ports.

The filters also provide line-2 connections for compatibility with two-line phones and are certified for CE Mark (Europe) and A-Tick (Australia).

Excelsus DSL filters and splitters incorporate unique, industry-leading Z-Blocker technology that demonstrates high performance voice and data characteristics with regard to insertion loss, return loss, and stop-band isolation.

In addition, the technology allows utilisation of manufacturing techniques that ensure low cost and high performance.