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Configuring the SHDSL line interfaces
Diagnostic internal, external, and bit error-rate tests
[in SHDSL/{ shelf-1 slot-1 1 }:line-config]
loop-back = none
You configure a line for external diagnostic testing by putting it into loopback mode,
as shown in the following example:
admin> read shdsl {1 1 1}
SHDSL/{ shelf-1 slot-1 1 } read
admin> set loop-back = analog
admin> write
Digital loopback
When a line is enabled for digital loopback, data is looped only at the digital circuitry
of the modem. Data does not reach the analog circuitry, as shown in Figure 8-1.
Figure 8-1. Digital loopback
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 8-2. Analog
loopback tests more circuitry.
Figure 8-2. 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
8-20
Digital
circuitry
DSL loop
Digital
circuitry
DSL loop
Analog
(hybrid)
circuitry
DSL loop
Analog
(hybrid)
circuitry
DSL loop
Stinger® MRT Getting Started Guide
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