Cobalt Digital COMPASS 9220 Bidirectional ASI_MPTS Gateway - Manual (Page 9)

9 9220-UM V1.1
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Transport stream redundancy can be set to “Manual” or “Automatic”. In “Automatic”
mode, the unit will switch to the backup stream after a configurable timeout, if the
primary stream disappears. In “Manual” mode, the switch has to be performed by the
operator.
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Regardless of the Automatic/Manual mode, the operator always has the ability to instruct
the unit to switch to the other transport stream.
The 9220 offers two independent redundancy levels, which can be combined if desired:
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IP Input Address/Port Redundancy
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Connection Redundancy
IP Input Address/Port Redundancy
An IP Input receives a transport stream over UDP/IP, on a given IP Address/UDP Port
combination, with an optional Source IP address specification. For each IP Input, the unit allows
an optional backup IP Address/UDP Port/Optional Source IP Address combination to be
specified. If the transport stream disappears from the primary address/port combination, the port
can switch to the backup address/port combination (if configured for automatic redundancy).
The automatic switch timeout can be set to a value between 2 and 45 seconds.
This level of redundancy is available for all IP input ports, and is independent of any connections
that may exist to the port. It uses no internal resources in the 9220 (i.e., it does not “count” as an
input or as a connection), but it has the following limitations:
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It is only available for IP input ports.
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The primary and backup transport streams must be available on the same Ethernet port.
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The 9220 does not monitor the inactive stream. Therefore, if the active stream disappears
and the other stream not running either, the 9220 will be switching back and forth until
one of the two streams comes back.
The Connection Redundancy level does not have the above limitations, but it does use internal
resources in the 9220.
Connection Redundancy
In normal operation, an output port is connected to an input port. The 9220 offers the option of
having a backup input port for each connection. If the transport stream coming from the primary
input disappears, the connection can switch to the backup input if configured for automatic
redundancy. The automatic switch timeout can be set to a value between 2 and 45 seconds.
Connection redundancy does use resources – two input ports must be created and available, and
two connections are used (counting against the 8-connection maximum per input). This mode of
operation offers the following features:
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Different port types can be used as primary/backup pairs. For example, an ASI input can
be configured as the backup for an IP input or vice-versa. Here are some examples of
configurations that can exploit this flexibility: