AVT MAGIC TH2, Hardware Manual

Page: 107 / 130

PAGE 107
E r r o r c o r r e c t i o n
A 2 E R R O R C O R R E C T I O N
TAB. 4 ERROR CORRECTION
Problem Possible cause and correction
On the analogue telephone line no
external connection can be estab-
lished.
If you operate the system with a private branch exchange, a
prefix number must be entered (see Page 42).
A radio signal is received in the
analogue operating mode.
Please check if the POTS line is twisted. The system must be
earthed via the earthing screw (see Page 21.)
There is a humming in the ana-
logue operating mode.
Please enable the 50 Hz filter. The humming is injected via the
POTS connection (see Page 41).
The Echo Canceller does not
work.
If you switch callers via a Call-In Center to the hybrid the Echo
Canceller is possibly adjusted incorrectly. Enable the Echo
Canceller permanently (see Page 44). Please notice that echoes
of more than 32 ms cannot be filtered out anymore.