DekTec DTE-3114 IP to 4x QAM - Manual (Page 23)

DTE-3114 – Networked Quad QAM Modulator
USER MANUAL
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3.4.2 SNMP – Actual and desired settings
The DTE-3114 uses a special mechanism for dealing with erroneous combination of parameters,
using “actual” and “desired” settings.
Actual settings The set of parameters that is currently active.
By design, the actual settings are always valid , because invalid parameter
values are never propagated to the actual settings.
Desired settings SNMP read and write requests operate on the desired settings.
When – after an SNMP write – there are no errors in the desired settings,
they will be copied directly to the actual settings and become operational.
However, if changing a setting causes a settings error, the desired settings
are updated but the actual settings remain unchanged. Only when the
desired settings are consistent again, they will be copied to the actual
settings.
Note: Desired settings will be lost during a power cycle
It has to be emphasized that SNMP read actions operate on the desired settings. The actual settings
cannot be directly observed from SNMP. If the SNMP manager wants to observe the actual settings,
he can do so by writing a ‘1’ to object devSynchroniseSettings in the DTE-MIB. This will copy the
actual settings back to the desired settings.
An NMS can force a certain parameter set by writing the required values to all MIB objects that
represent a writeable parameter. Doing this will not interrupt the operation of channels which had
the right settings already.
3.4.3 SNMP – Traps
The DTE-3114 supports two SNMP traps. To become operational, the traps have to be enabled and
a destination IP address and trap community must be set.
Temperature trap Generated if the temperature rises above a given value.
The temperature threshold can be set via SNMP in the DTE-MIB.
RF level trap Generated if the difference in dB between the device's target and measured
RF level exceeds a given threshold. Under normal circumstances this trap
will not occur unless the DTE-3114 is defective.
The maximum RF level difference can be set in the DTE-QAMMOD-MIB;
this value can safely be left at its default value.
3.5 Settings errors
To avoid invalid user settings a settings error mechanism in both web interface and SNMP is active.
The tables below provide a list of all settings errors. Note that the settings-status field reports only
the first error appearing on the list. When the error is removed, the next settings error, if any, will
appear.
Settings errors related to the “SMPTE Settings” webpage and DTE-MIB:
ID Settings error Description / Remarks
1. IP address is not valid The selected IP address cannot be used as source
address. The valid range for multicast addressing is
224.0.0.0 .. 239.255.255.255.