• DVB-ASI Compliant.
• ASI carrier frequency measurement.
• TS data rate measurement.
• TS Sync Byte error detection.
• TS Sync pulse jitter measurement with alarming on user-defined window.
• Data byte spacing measurement with minimum and maximum stuffing characters.
• Null packets bite rate measurement.
• Copper or Fibre Optic (optional extra) inputs.
• LCD screen display.
• RS232 Control.
• Optional Ethernet 10-BaseT interface.

Signal Status

Indicates one of the following 3 states, OK, LOSS, or ERRORS. The latter is shown when the signal is bad or disconnected and the received ASI characters are invalid. OK and LOSS are used to indicate a TS sync condition.

ASI Carrier Frequency

Typically 270MHz, is measured to an accuracy of 1ppm and a resolution of 10 Hz

TS Datarate

Is the number of data characters per seconds. All special 'K' characters are discarded as these are used as stuffing. This measurement is independent whether or not a valid TS is being transmitted. The error in part per million (ppm) from the expected datarate is also calculated.

Byte Mode / Burst Mode Packet Counts

Are sorted into byte mode or burst mode and measured as packets per second. A faulty ASI TS may consist of either combination of these modes due to multiplexers trying to insert packets in a TS in the wrong format. Byte mode is when each ASI data character is seperated by 2 or more special 'K' stuffing characters. Burst mode is when all 188, 204 or 208 data bytes are sent continuously with 2 or more special 'K' stuffing characters after the last data character and before the next sync byte data character.

Sync Byte Jitter

Consists of a 4 byte header, the first of which is a 0x47 synchronisation byte. This is often used for Phase Lock Loops (PLLs) in clock recovery circuits. Ideally these sync bytes should be regular, but even one missing packet will make the sync byte arrive twice as late.

Data Byte Jitter

Contains data bytes which may be sequential in burst mode or stuffed with special 'K' characters as in byte mode. This measurement wil show the minimum and maximum number of special 'K' characters found between data bytes.

Null Packet Bitrate

In a TS are identified by a PID or 0x1FFF. These are used to stuff a TS when there is insufficient video, audio or other data to be transmitted to fill the required data rate.

Character Violations

Are any received ASI characters either special or data bytes that are not valid 10 bit ASI codes will cause an increase in the character violation counter. This can indicate whether an ASI feed has errors due to bad signal levels and not by a multiplexer or encoder.

Windows GUI

Software application allows monitoring and logging capability.

Alarms

Are provided by a comprehensive multi level alarm signalling for critical alarm status.