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Configuring the SHDSL line interfaces
Diagnostic internal, external, and bit error-rate tests
Parameter
snr
stur-loop-attenuation
stur-snr
Diagnostic internal, external, and bit error-rate tests
You can use the internal diagnostic test to identify problems that might occur during
data transfer between the internal control module hardware and the line interface. If
the internal diagnostic test (IDT) feature is enabled for a line, the system generates a
data stream from the internal control module hardware and sends it to the specified
line. The line loops the data back to the internal control module hardware. The unit
then analyzes the data and reports the statistics in the line-diag-stat profile.
You can run a bit-error-rate test (BERT) to check the data integrity of the interface or
connection. While a BERT is running, normal data transmission is interrupted on the
line.
The line-diag profile contains the parameters that you use to configure a line for an
IDT and a BERT. Following is a listing of the profile, shown with default values:
[in LINE-DIAG/{ shelf-1 slot-1 1 }]
physical-address* = { shelf-1 slot-1 1 }
bert-timer = 1 minute
bert-enable = no
idt-enable = no
idt-num-of-msg = 1000
8-16
Indicates
Signal-to-noise ratio on the line, in decibels. The
signal-to-noise ratio defines a relationship between
the noise floor and the signal. For an SHDSL interface,
a reading of 24dB or higher is required for reliable data
transfer.
Indicates the current signal reduction in the loop, in
decibels. The stur-loop-attenuation parameter value
is received by the central office equipment (COE) from
the customer premises equipment (CPE), and thus
characterizes how the loop attenuation looks from the
CPE's perspective.
Signal-to-noise ratio on the line (in decibels). For an
SHDSL interface, a reading of 24dB or higher is
required for reliable data transfer. The stur-snr
parameter value is received by reported message from
the customer premises equipment (CPE) as a direct
request from the central office equipment (COE), and
thus is the CPE's snr reading.
Stinger® MRT Getting Started Guide
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