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7 Operation on xDSL accesses
73
ARGUS 165
Data
transmission
units (DTU)
Retransmission is performed before the CRC
mechanism. As long as the retransmission
mechanism requests and and transmits the
erroneous DTUs in corrected form, no CRC errors
(data losses) occur. If the retransmission
mechanism cannot correct faulty transmissions,
e.g. due to sustained interference, CRC errors
(data losses) occur.
- Retransmi. Multiple retransmitted DTUs due to a
transmission problem. Is also displayed in the
overview page 59 as "Retransmi".
- Correct: Successful retransmission of a DTU
- Uncorrect: Unsuccessful retransmission of a DTU
INP REIN
In ARGUS, interference immunity (DSLAM setting)
is displayed with respect to REIN INP. This
describes the quality of the protection against
pulse interference. REIN (Repetitive electrical
impulse noise) describes periodic interference
pulses, usually caused by 230 V AC voltage from
the supply mains. The value indicates the number
of consecutive DMT symbols that can be
completely distorted without causing errors in
higher layers (1 DMT symbol = ~250 µs).
INP SHINE
In ARGUS, interference immunity (DSLAM setting)
is displayed with respect to SHINE INP. This
describes the quality of the protection against
pulse interference.SHINE (single high impulse
noise event) describes random, unpredictable,
non-periodic interference pulses. The value
indicates the number of consecutive DMT symbols
that can be completely distorted without causing
errors in higher layers (1 DMT symbol = ~250 µs).
ETR
The expected throughput rate (ETR) in kBit/s is the
minimum data rate that can be provided through
complete error correction through retransmission.
Elec.length@1MHz
Indication of the electrical length for a frequency of 1 MHz in dB.
R: VTU-R side
C: VTU-C side
Vendor far
VTU-C vendor.
Version
Vendor-specific information, contains the software version of the
VTU-C side (DSLAM).
Vendor near
Manufacturer of the ARGUS chipset (VTU-R).
Version
Vendor-specific information, contains the software version of
ARGUS.
Summary of Contents for 165
Page 26: ...4 Quick start guide 26 ARGUS 165 ...
Page 170: ...15 IP tests 170 ARGUS 165 ...
Page 235: ...19 Parallel tests ARGUS 165 235 ...
Page 284: ...23 Copper tests 284 ARGUS 165 ...