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Stinger®
SHDSL 48-Port and 72-Port Line Interface Modules (LIM) Guide
Configuring the SHDSL LIM
Diagnostic internal, external, and bit error-rate tests
Analog loopback
When the line is enabled for analog loopback, the data passes from the digital
circuitry to analog circuitry and is then looped back, as shown in Figure 1-6. Analog
loopback tests more circuitry.
Figure 1-6. Analog loopback
The following example puts a line into analog loopback mode:
admin> read shdsl {1 1 1}
SHDSL/{ shelf-1 slot-1 1 } read
admin> set loop-back = analog
admin> write
DSL loop
Analog
(hybrid)
circuitry
Digital
circuitry
DSL loop