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Press the [Setup] key to edit the selected tone.
Press the [Tab] key to select either Frequency or
the Level for editing.
Press the [Enter] key to accept the changes and
return to the Tone Menu screen.
Press the [Back] key to return without making
changes.
You may only change the frequency of the ID
Tone. The level is fixed at its maximum value.
You may not change the frequency or level of
the 40000 Hertz tone. Use the 40000 Hertz tone
in conjunction with Wideband Loss (see page
39) as a pre-qualification test for ISDN.
The 40000 Hertz tone is sent with a source
impedance of 135 Ohms. All other tones are
sent with a source impedance of 600 Ohms.