chris@yarra.oz.au (Chris Jankowski) (09/13/89)
My TrailBlazer manual lists the following options to select guard tones
apparently used by V22 and V22bis modems during call establishment:
S91=0 - no guard tone
S91=1 - use 1800 Hz guard tone
S91=2 - use 550 Hz guard tone
Questions:
-What are the guard tones for?
-Why you have three options here and are they mutually exclusive?
-Is there any indication what modem may use which option - by country
of manufacturing perhaps?
-m------- Chris Jankowski - Senior Systems Engineer chris@yarra.oz{.au}
---mmm----- Pyramid Technology Australia fax +61 3 820 0536
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