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Unity 4650 User's Manual
Automated
If unable to deliver required services to predetermined standards, or if unable
recovery
to detect a required network control stream (COMPEL ), the U4650 attempts
to resume normal operation through a process called Automated Recovery.
Referring to an internal, non-volatile list of "presets", the U4650 will attempt
to restore either services or network control, depending on what caused the
recovery. A "preset" is a list of unit settings, and the list of these presets is
called the Preset Table. Automated Recovery will attempt to restore the unit
according to each preset (one at a time) in the order in which they are listed in
the table. The process continues (repeating attempts if necessary) until the unit
successfully resumes normal operation or is halted by local user command. If
successful with a preset, the settings in that preset become the permanent unit
settings. Later, the local user (or the network, if available) may abort the results
of the Automated Recovery and force the unit back to its last commanded set-
ting.
Several user- or network-programmable objects control the Automated Recov-
ery. In addition to the contents of the Preset Table, these objects include the
Services Recovery Timeout, the Network Recovery Timeout, the Recovery
Iteration Time, and the Local Control Re-enable Timeout. The first two time-
outs control how long the unit will wait after loss of services or network con-
trol, respectively, before entering Automated Recovery. The Recovery
Iteration Time sets the maximum time the unit will spend attempting recovery
at each preset. The last is a special timeout for disaster recovery, such as loss of
a satellite, where units whose local control was previously disabled by the net-
work are re-enabled so that local users may implement more complex recovery
plans.
Monitoring
Most routine U4650 operations can be performed over Wegener's COMPEL
and control
Network Control System. Control is "broadcast" to individual units through a
"ghost-PID" data component of the incoming transport stream. The U4650 is
considered disconnected from the network at any time this special stream is not
being received.
In addition to the remote COMPEL network control, three methods are pro-
vided for "local" monitoring and control of the U4650: a web browser interface
(later release), a terminal interface, and a front-panel interface.
NOTE: Local control may be limited by COMPEL command.
The remainder of this chapter details these local monitor and control interfaces.
800034-01 Rev. A
38
wegener.com
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