Figure 3.16 Example of distribution of time slots in an SHDSL frame at a line rate of 89x64 kbit/s
in the mode when both E1 interfaces 1280 kbps of V.35 and both internal WAN1 and WAN2
ports are used for the termination device.
3.2.4 Test Loops
The possibility to activate test loops on E1 or SHDSL line interface simplifies the device start-and-
adjustment.
Figure 3.17. Test loops
Test loops can be activated for the Master and Slave devices as well as for the Regenerator.
The LOOP1 ON/OFF N command is used to activate/deactivate LOOP1, where N is the number
of the network interface.
LOOP2 M:N, where M is the number of the line interface and N is the number of the Regenerator,
can be activated only remotely. This command allows activating remotely a loop back to the
device, from which the command was sent. It means that if LOOP2 is activated remotely by the
Master device, the data will be looped back by the Slave device to the Master device side, and
vice versa.
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