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7 Operation on xDSL accesses
75
ARGUS 165
ARGUS determines the following SHDSL connection parameters:
SHDSL connection parameters:
SNR margin
Signal-to-noise ratio margin in dB. The SNR margin is a measure of
how much additional noise the transmission can stand and still
maintain a bit error rate (BER) of 10
-7
. This value is considered a
reserve against interference signals.
SNR
Signal-to-noise ratio in dB.
Attenuation (dB)
Attenuation on a line over the entire length in dB.
Output Power
Output power in dBm with reference to 1 mW.
CRC
Cyclic Redundancy Check
Number of CRC anomalies (CRC6 checksum errors), also known as
code violations (CV). The sums of the one-second periods are
totalled by ARGUS.
LOSWS
Loss of sync word seconds
Number of seconds containing one or more erroneous sync words.
ES
Errored seconds
Number of seconds containing one or more erroneous sync words
and/or one or more CRC anomalies.
SES
Severely errored seconds
Number of seconds containing one or more erroneous sync words
or at least 50 CRC anomalies.
US
Unavailable seconds
Number of seconds in which the SHDSL link was unavailable. The
connection is considered unavailable at 10 consecutive SESs at the
latest. The 10 SESs are added to the time that the connection is
unavailable. If the connection is unavailable, it only becomes
available when no SESs occur in 10 consecutive seconds. The 10
SES-free seconds are added to the time that the connection is
unavailable.
Содержание 165
Страница 26: ...4 Quick start guide 26 ARGUS 165 ...
Страница 37: ...5 Configuring accesses ARGUS 165 37 Test parameter settings are described starting on page 124 ...
Страница 170: ...15 IP tests 170 ARGUS 165 ...
Страница 235: ...19 Parallel tests ARGUS 165 235 ...
Страница 284: ...23 Copper tests 284 ARGUS 165 ...