Patton electronic 2707C, 2707D, X.21 Interfaces user manual SW1-6 and SW1-7 Clock Modes

SW1-6 and SW1-7 Clock Modes

Use Switches SW1-6 and SW1-7 to configure the 2707 for internal, external, or receive recover clock mode.

Table 3: SW1-6 and SW1-7 Clock Modes

SW1-6	SW1-7		Clock Mode
ON	ON		Network (Received Recovered)
ON	OFF		Internal
OFF	ON		External
OFF	OFF		Network (Received Recovered)
Network Clock		Transmitter timing is derived using
		the received line signal (received
		recovered) from the network.
Internal Clock		Transmitter timing is derived from
		an internal clock source.
External Clock		Transmitter timing is derived from
		DTE terminal timing.

SW1-8: Enable/Disable Loop Tests from DTE

Use Switch SW1-8 to allow Model 2707 to enter loopback tests when the DTE raises the appropriate loop request pin.

SW1-8	Setting
Off	Response to DTE Loopback Request Enabled
On	Response to DTE Loopback Request Disabled

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