User manual

1–2 • Introduction ASI-310 User Manual (Iss. 03)
Overview
The ASI-310 accepts a DVB-ASI input containing an MPEG 2 Transport Stream, and produces a
SMPTE 310M Transport Stream output at one of two standard frequencies: 19.392659 or
38.785317 Mbps. It also simultaneously accepts a 310M Transport Stream at either of the
standard frequencies and produces a DVB-ASI signal.
The ASI-310 provides a number of innovative tools to simplify your workflow. For example:
• It allows user setup of the 310M input and output rates to either of the two available
frequencies.
• It has an accurate on-board temperature-compensated crystal oscillator that generates a
free-running output frequency which meets the specified tolerance of ± 2.8ppm.
• For applications requiring even tighter frequency tolerance, or to ensure frequency
coherence with house sync, the user can provide a 310 input and set the ASI-310 to lock
its output bit rate to it.
• The ASI-310 accepts a Transport Stream having a rate much higher or lower than the
selected output 310 rate, provided that the net input rate (input rate not including null
packets) is less than or equal to the selected 310 rate. If the average input rate is too low,
the ASI-310 adds null packets as needed to maintain the output rate; if the input rate is
too high, it deletes null packets as needed.
• The ASI-310 provides selectable PCR re-stamping to correct timing errors caused by the
insertion or deletion of null packets to achieve the desired 310M output bit rate.
• The included 310-to-ASI converter allows independent simultaneous conversions in both
directions.
• The combination of a second 310M output and the 310-to-ASI converter allows
in-service monitoring of the 310M output with ASI-based equipment such as the Ross
Video TSM-100.
• Error conditions such as loss of input, or a net input rate exceeding the output rate, are
reported through the GUI and can be assigned to GPI/O outputs for connection to an
external alarm or monitoring system.
• The ASI-310 tolerates any single occurrence of an invalid sync character before declaring
loss of sync. Upon loss of sync, caused for example by asynchronous switching of ASI
signals, it recovers sync rapidly.
Features
The following features make the ASI-310 the solution of choice for converting MPEG Transport
Streams in DVB-ASI format to SMPTE 310M as commonly used in ATSC systems:
• ASI input and two 310 outputs on 75ohm BNC jacks located on the rear module.
• 310M input and ASI output on 75ohm BNC jacks located on the rear module.
• Independently selectable 310M input and output rates: 19.392659 or 38.785317 Mbps.
• Selectable clock source: on-board temperature-compensated crystal oscillator or 310M
input.
• Rate conversion and PCR re-stamping
• Cards are hot-pluggable for ease of configuration and maintenance.
• Compatible with the openGear frame’s SNMP option, allowing monitoring with
third-party SNMP software systems
• Fits openGear DFR-8300 series frame