Billion Electric Company BiPAC 7300(G) RA - Manual (Page 8)

Quick Start Guide
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4. Splitter/ Micro-filter Connection
Splitter / Micro-filter are important for ADSL installation. High-frequency signals
are directed to the ADSL modem, and low-frequency signals are directed to the
telephone or other analog voice-channel device to prevent inter-modulation
distortion and also to get good speed and stable ADSL sync rate.
a) Splitter connection
If the installation has only a single telephone and a single ADSL modem, then a
splitter can be employed.
b) Micro-filter connection
If the installation has several telephones or other analog devices, then an
internal micro-filter can be employed at each analog device.