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The symptoms of data loss caused by a noisy telephone
line are seen on the
printouts
of received
messages.
An
example is shown opposite. Note that lines
are missing from the page at the indicated
locations.
ECM (Error Correction
Mode) is
an effective
countermeasure
against
this
type of error; you have the choice of having
the ECM feature
switched
on or off. It is
switched on before the machine leaves the
factory.
(Refer
to
page
62 for more
information
about ECM).
The
line
condition
is affected
by the
Document
weather;
thunderstorms
can
cause
electrical noise on telephone lines.
In addition,
the quality
and condition
of
switching
equipment
used by your phone
company can affect fax communication.
Errors
d
Q
~ "''A'-"
'ransmit ~
: Received
~ Message
,
1
1
I
ix
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