Patton electronic 2720 user manual Switch S2-6 and S2-7 Clock Mode, Switch S2-8 Reserved Switch S1

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	S2-7	Clock Mode
Off	Off	Network Clock. Transmitter timing is
		derived from the received line signal.
On	Off	Internal Clock. Transmitter clock is
		derived from an internal oscillator.

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

3.1.2 Switch S1

The chart below shows the default configurations for Switch S1. A description of all S1 options follows this table.

S1 SUMMARY TABE

Position	Function	Factory Default	Selected Option
S1-1	RDL Type	On		V.54 RDL
S1-2	Reserved	On
S1-3	Tx Clock Invert	Off			Normal
S1-4	Line Build Out	Off
					0dB
S1-5		Off
S1-6	Reserved	Off
S1-7	Reserved	Off
S1-8	Reserved	Off

Switch S1-1: RDL Type

Switch S1-1 selects the type of Remote Digital Loopback that the 2720 will initiate when the RDL is initiated from this unit. The 2720 will respond to both the V54 and the CSU loopback regardless of the setting of S1-1

S1-1	RDL Type
On	Initiate a V.54 RDL loop when selected
Off	Initiate a CSU loopback when selected

Switch S1-2: Reserved

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