ADTRAN SMART/RG SR506n, Руководство пользователя

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Field Name Description
Super Frame Errors The number of xDSL OH Frames transmitted/received with errors.
RS Words The number of Reed-Solomon-based Forward Error Correction (FEC) codewords trans-
mitted/received.
RS Correctable Errors The number of Reed-Solomon-based FEC codewords received with errors that have
been corrected.
RS Uncorrectable Errors The number of Reed-Solomon-based FEC codewords received with errors that were not
correctable.
RS Codewords Received (
Visible only for gateways connected via DSL
) Total number of Reed-Solomon Code-
words received.
RS Codewords Corrected (
Visible only for gateways connected via DSL
) Total number of Reed-Solomon Code-
words corrected.
RS Codewords Uncor-
rected (
Visible only for gateways connected via DSL
) Total number of Reed-Solomon Code-
words Uncorrected
HEC Errors A count of ATM HEC errors detected. As per ITU-T G.992.1 and G.992.3, a1-byte HEC is
generated for each ATM cell header. Error detection is implemented as defined in ITU-
T I.432.1 with the exception that any HEC error shall be considered as a multiple bit
error, and therefore, HEC Error Correction is not performed. [1],[2]
OCD Errors Total number of Out-of-Cell Delineation errors. ATM Cell delineation is the process
which allows identification of the cell boundaries. The HEC field is used to achieve cell
delineation. [4] An OCD Error is counted when the cell delineation process transitions
from the SYNC state to the HUNT state. [2]
LCD Errors Total number of Loss of Cell Delineation errors. An LCD Error is counted when at least
one OCD error is present in each of four consecutive overhead channel periods and SEF
(Severely Errored Frame) defect is present. [2]
Total Cells The total number of cells (OAM and Data cells) transmitted/received.
Data Cells The total number of data cells transmitted/received.
Bit Errors The total number of Idle Cell Bit Errors in the ATM Data Path. [3]
Total ES Total number of Errored Seconds. This parameter is a count of 1-second intervals with
one or more CRC-8 anomalies. [4]
Total SES Total number of Severely Errored Seconds. An SES is declared if, during a 1-second
interval, there are 18 or more CRC-8 anomalies in one or more of the received bearer
channels, or one or more LOS (Loss of Signal) defects, or one or more SEF (Severely
Errored Frame) defects, or one or more LPR (Loss of Power) defects. [4]
Total UAS
Total number of Unavailable Seconds. This parameter is a count of 1-second intervals
for which the xDSL line is unavailable. The xDSL line becomes unavailable at the onset
of 10 contiguous SESs. These 10 SES’s shall be included in the unavailable time. Once
unavailable, the xDSL line becomes available at the onset of 10 contiguous seconds
with no SESs. These 10 seconds with no SES’s shall be excluded from unavailable time.
[4]
References
[1] ITU-T Recommendation G.992.1 (1999), Asymmetric digital subscriber line (ADSL) transceivers.
[2] ITU-T Recommendation G.992.3 (2005), Asymmetric digital subscriber line transceivers 2 (ADSL2).
[3] ITU-T Recommendation G.997.1 (2006), Physical layer management for digital subscriber line (DSL) transceivers.