Datasheet

6 Operation on an ADSL Access
46 ARGUS 141
The ARGUS determines the following ADSL connection parameters:
ADSL connection parameters
ATM The actual useable ATM bitrate in kBit/s.
Attainable ATM This is the theoretically attainable ATM bitrate in kbit/s.
Relative capacity Utilization of the line as a percentage
Latency mode Depending on the configuration of the DSLAM, the ARGUS will
display either Interleaved or Fast mode.
Attenuation The line’s attenuation in dB over its entire length and
bandwidth.
Output power Output power in dBm
SNR margin The signal-to-noise ratio in dB; the SNR margin is a measure
of how much additional noise the transmission can withstand
and still achieve a BER (Bit Error Rate) of 10
-7
.
Impulse noise prot. The Impulse Noise Protection is an indicator of the quality of
the protective mechanism as far as impulse noise is
concerned.
The number of DMT symbols, which can be completely
distorted in succession, without an error occurring on the
higher layers.
Interleave Delay The delay (in msec) caused by interleaving the data blocks.
FEC Forward Error Correction
The number of transmission errors corrected using the ATM
cell checkbytes.
f (far): Errors that the DSLAM has detected and informed
the ARGUS.
n (near): Errors which were detected by the ARGUS in the
blocks it received.
CRC Cyclic Redundancy Check
The superframe checksum sent from the opposing end does
not match the one calculated locally. Possible cause: Fault on
the line.
f (far): Errors that the DSLAM has detected and informed
the ARGUS.
n (near): Errors which were detected by the ARGUS in the
blocks it received.