Black Box MC115A User Manual page 19

CHAPTER 4: Level Switch
Setting 2 is the highest level. Use this setting if you
connect your Mobile Linc-Up to a telephone that has
a carbon microphone. Older residential telephones
and some hotel telephones use carbon microphones.
Setting 4 is the lowest level. Setting 3 is the most
common position; it is used for electronic
telephones.
If you set the Level switch too high, you will hear
feedback such as a buzz or loud squeal through the
modem speaker when your modem is off-hook. If
you hear feedback, set the Level switch to the next
lower setting—using the sequence 2, 3, 1, 4—until
the feedback disappears.
For example, if the Level switch is set to 2 and you
hear feedback, set it to 3. If you still hear feedback,
set it to 1. If feedback continues, set it to 4.
Table 4-1 shows the Level switch settings to use for
various telephone models. If the telephone you want
to use does not appear in Table 4-1, set the level as
described in the previous section. If feedback occurs
for all four levels, contact your supplier.
A "Yes" in the Autodial column indicates that
autodialing is supported with that telephone model.
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