Tektronix MTM400 - Manual (Page 116)

Stream View
3-68 MTM400 MPEG Transport Stream Monitor User Manual
Template
Simply monitoring the syntax of a Transport Stream according to TR101 290 is not
enough to guarantee that the correct information is being delivered to the viewers'
receiver. Ensuring that the contents of the Transport Stream are correct requires the
monitoring equipment to have prior knowledge of what the broadcaster plans to
transmit. A template in which the operator enters the values expected to be present
in a Transport Stream can be compared with a transport stream to verify its
content, and made to indicate any discrepancy.
The composition of a transport stream may vary during the day as daytime
programming is replaced by the evening primetime and then the late night
programs. You can schedule template changes to coincide with changes in the
program content.
Among the items that can be checked using a template are the following:
ƒ
Transport stream identifier
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Services - presence, name
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PIDs in services
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PID types and scrambling state
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Service regional ratings
The template feature allows you to create a template can be applied to a stream (or
streams) that is being monitored. If the stream does not conform to the template,
the associated icon changes color (in the same way as the error icons) and an entry
is made in the error log.
Initially, templates are stream-specific, that is, a template will be created and
applied to a specific stream. However, a template can subsequently be uploaded to
any device.
In Figure 3-28, the presence of two services (Service 28129 and 28132) in
transport stream 1101 is being checked. In addition, details of the service and
associated PIDs are checked.