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ANNEXE 1
3.3
SHDSL MIB (HDSL2-SHDSL-LINE-MIB)
This MIB contains information relative to the SHDSL connections. It is published by the IETF in RFC4319.
3.3.1
Table HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndPointCurrTable :
This table contains information about how the line is working.
At least the Attenuation and SNR margin should be monitored.
The attenuation gives an indication about the length of the line and the insertion losses of the connectors.
The SNR margin tells how much noise the receiving modem can bear without causing transmission errors or
disconnects.
The number of erroneous seconds should also be monitored. It indicates the availability of the line. A number
near zero indicates a noise free operation. A high number indicates noise or signal distortion somewhere on the
line. Usual causes include crosstalk, inadequate surge protectors and EMI disturbances caused by other
equipment.
OID HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrAtn: Line attenuation
•
•
OID HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrSnrMgn: SNR margin
OID HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointrrActivationState: Line status, connected or not
•
(Warning, the other fields are invalid when this parameter value is not « data »
OID HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCRCAnomalies: CRC errors on the line
•
OID HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointLOSWS: Seconds with one or more synchronization
•
loss
OID HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointES: Erroneous seconds. A second is « erroneous » if
•
there are one or several CRC errors or synchronization loss
OID HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointSES: Severely erroneous seconds . A second is
•
« severely erroneous » if there are at least 50 CRC errors or one or several synchronization loss.
•
OID HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointUAS: Unavailable seconds. A second is
« unavailable » after 10 consecutive severely erroneous seconds. It is necessary to have 10 seconds
with no « severely erroneous » seconds to leave this state.
For more information, refer to ITU-T standard G.991.2 (G.SHDSL.bis).
The other fields are not supported.
Example
mc@ubuntu:~$
snmpwalk
MIB::hdsl2ShdslEndpointCurrTable
HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrAtn.12.0.networkSide.wirePair1
INTEGER: 0 dB
HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrAtn.13.0.networkSide.wirePair1
INTEGER: 0 dB
HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrAtn.14.0.networkSide.wirePair1
INTEGER: 0 dB
HDSL2-SHDSL-LINE-MIB::hdsl2ShdslEndpointCurrAtn.15.0.networkSide.wirePair1
INTEGER: 0 dB
...
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HDSL2-SHDSL-LINE-
DOC_DEV_XS_Guide de configuration_C
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