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Switch S2-6 and S2-7: Clock Mode
Set Switch S2-6 and S2-7 to determine the 2720's transmitter tim-
ing.
S2-6
Off
On
NOTE 1: When using the Model 2720 as a high-speed short
range modem, one unit of the link must be configured in Internal
Clock mode, and the opposite end unit must be configured for
Network Clock mode.
If the ERR LED on the front of the unit is flashing (or on) it could
be an indication of a clocking problem. Double check your clock
mode settings and Tx Clock Invert S1-3 settings.
Switch S2-8 Reserved
S2-7
Clock Mode
Off
Network Clock . Transmitter timing is
derived from the received line signal.
Off
Internal Clock . Transmitter clock is
derived from an internal oscillator.
10
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