6 Operation on an ADSL Access
ARGUS 145
PLUS
59
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.
