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