Patton electronic user manual Operating Line Loopback LL, NTU Model 2707/I Mbps G.703, Device

6.3 OPERATING LINE LOOPBACK (LL)

The Line Loopback (LL) test checks the operation of the local Model 2707/I, and is performed separately on each unit.

			G.703 NTU
			Model 2707/I
2 Mbps G.703				Network	Ethernet
	Network			Clocking	Device
		Cable Span
	Clock/
	Data			Data
	Clock/
	Data			Model
				2707/I

Figure 12. Line loopback for a network termination application

To perform an LL test, set DIP switch S1-2 to On. The TM LED will be lit while the unit is in loopback test mode.

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