Dynamode M-ADSL-FILTER Leaflet
M-ADSL-FILTER
INTRODUCTION
The M-ADSL-Filter has been specifically designed to implement the functionality of a low
pass filter using G.Lite Technology. This technology is similar to full rate ADSL but operates at
a lower data rate of up to 1.5Mbps downstream and 512Kbps upstream, depending on line
conditions and lengths. M-ADSL-Filter is a lower speed alternative version of ADSL that will
eliminate the need for telecom to install and maintain a premises based POTS splitter. It was
found necessary to include one or more, low pass filters in series with the POTS terminals in
order to reliably achieve maximum data rates. For POTS voice band service, the M-ADSL-
Filter provides protection from ADSL signals, which may impact through non-line or other
remote devices (handset, fax, voice band modem etc) and central office operations. For ADSL
signals, it also provides protection from the high frequency transient and impedance effect that
occur during POTS operations (ringing transients, on-hook, off-hook transient and so on).
Because the POTS splitter in the M-ADSL-Filter connects directly to the subscriber loop media,
it also provides some protection for externally induced line hits or faults which could damage
any attached equipment or endanger people interacting with the installed equipment. The
circuit protection will be provided mostly by standard central office line protection means and
additional protection measures built into the POTS splitter to protect against line overstress,
which could damage the splitter itself.
pass filter using G.Lite Technology. This technology is similar to full rate ADSL but operates at
a lower data rate of up to 1.5Mbps downstream and 512Kbps upstream, depending on line
conditions and lengths. M-ADSL-Filter is a lower speed alternative version of ADSL that will
eliminate the need for telecom to install and maintain a premises based POTS splitter. It was
found necessary to include one or more, low pass filters in series with the POTS terminals in
order to reliably achieve maximum data rates. For POTS voice band service, the M-ADSL-
Filter provides protection from ADSL signals, which may impact through non-line or other
remote devices (handset, fax, voice band modem etc) and central office operations. For ADSL
signals, it also provides protection from the high frequency transient and impedance effect that
occur during POTS operations (ringing transients, on-hook, off-hook transient and so on).
Because the POTS splitter in the M-ADSL-Filter connects directly to the subscriber loop media,
it also provides some protection for externally induced line hits or faults which could damage
any attached equipment or endanger people interacting with the installed equipment. The
circuit protection will be provided mostly by standard central office line protection means and
additional protection measures built into the POTS splitter to protect against line overstress,
which could damage the splitter itself.
Microfilter & Splitter for ADSL Lines
DC CHARACTERISTICS:
All requirements of this specification can be met in the presence of all POTS loop currents from 0 mA to
100 mA. This Single In-Line filter can pass POTS tip-to-ring DC voltages of 0 V to 105 V and ringing
signals of 40 Vrms to 150 Vrms at any frequencies from 15.3 Hz to 68 Hz superimposed on DC voltages
in the range from 0 V to 105 V. The DC resistance from tip-to-ring at the line port interface with the
phone interface shorted, shall be less than or equal to 50 ohms for one filter. The DC resistance from tip-
to-ground and from ring-to-ground at the Phone interface with the Line interface open shall be greater
than or equal to 10 Megohms. The ground point shall be local building or green wire ground. As an
objective,
100 mA. This Single In-Line filter can pass POTS tip-to-ring DC voltages of 0 V to 105 V and ringing
signals of 40 Vrms to 150 Vrms at any frequencies from 15.3 Hz to 68 Hz superimposed on DC voltages
in the range from 0 V to 105 V. The DC resistance from tip-to-ring at the line port interface with the
phone interface shorted, shall be less than or equal to 50 ohms for one filter. The DC resistance from tip-
to-ground and from ring-to-ground at the Phone interface with the Line interface open shall be greater
than or equal to 10 Megohms. The ground point shall be local building or green wire ground. As an
objective,
the DC resistance should exceed 10 MW.