Ensemble Designs 4500 ASI and SMPTE 310M Converter and MPEG Transport Processor - Manual (Page 4)

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Model 4500 MPEG Stream Processor
MODULE OVERVIEW
DVB-ASI and SMPTE 310M Converter and MPEG Transport Processor
The 4500 MPEG Transport Stream Processor processes DVB-ASI and SMPTE 310M bitstreams. It
provides stream content analysis with support for Priority 1 and Priority 2 test protocols of the ETR 290
DVB measurement guidelines. As a converter, it can translate ASI to 310M or 310M to ASI. Using the
reference input, the output bitstream can be synchronized to a video or 10 MHz reference signal.
The 4500 module is useful in broadcast and transmission applications. Set the output of the 4500
module to the desired signal type, either ASI or 310M. The module auto-senses what type of signal is
on the input and converts as needed. Advanced configuration in the Avenue Control System allows
choosing which services on the input are passed on to the output.
The built-in transport stream analyzer detects whether the input constitutes a valid signal by checking
for PAT, PMT, and PID packets. In addition to the ETR 290 test protocols, you can configure tests to
define the minimum number of video and audio packets expected per second in a given service.
Alarms can be generated via SNMP, Avenue PC, and contact closure outputs.
The 4500 acts as a Time Base Corrector to remove jitter and adjust transport streams to the precise,
desired bit rate. The reference input to the 4500 allows the use of either analog video or a 10
MHz signal to synchronize the output of the module. This is of particular importance in broadcast
applications where the quality of the symbol clock – both jitter and accuracy – bears directly on the
modulation process.
Reference to the 4500 can be supplied from an Avenue 7400 or 9400 SPG with GPS Option in order to
provide the ultimate clock accuracy. In this configuration, the 4500 is an ideal solution to frequency
coordination for multi-transmitter systems like Single Frequency Networks (SFN) and mobile/handheld
transmission services.
A CRC and Data Checksum packet can be inserted into the stream by the 4500 to provide data path
integrity testing at downstream points. Monitoring of these special packets can be performed by
a second 4500 or an Avenue 4450, 4455, or 7455 ASI/310 Protection Switch. Data Integrity history
is carried forward through the system to facilitate fault finding. These CRC packets provide an
unequivocal test of data integrity on a transmission link by transmission link basis.