ASI-310 User Guide (v5.0)
Configuration • 23
Configuration
This chapter explains how to use the options in DashBoard to set up the ASI-310. This discussion is based on the
use of DashBoard through a network connection. The order of sections in this chapter follows the work-flow
required to setup the ASI-310 for operation. It is recommended that you proceed through the following sections in
order to achieve the best possible understanding of the product.
ASI-to-310 Converter Settings
The
ASI to 310
tab provides options for configuring the ASI-to-310 converter feature.
To set up the ASI-to-310 converter
1. Select the
ASI to 310
tab.
2. Use the
310 Output Bit Rate
options to set the output data rate.
3. Use the
Output Packet Size
options to specify the number of bytes per packet in the 310 output.
This is normally 188 bytes, but you can set it to 204 or 208 bytes if needed for your application. If the input
packet size is different from the output size you specify, the converter adjusts the number of dummy
error-correction bytes appended to the basic 188-byte payload to achieve the desired total packet length.
4. Configure the
PCR Restamping
option.
It should normally be left at the
On
setting, since this minimizes PCR error and jitter in the output. It does this
by adjusting the PCR values to account for the slightly variable packet processing delays caused by adding or
deleting null packets to maintain the specified output data rate and/or modify the packet size.
5. Set the
310 Output Clock
to either Free-running or Lock to 310 Input.
If you have a high-accuracy high-stability 310 signal available, you can connect it to the 310 Input jack, and set
this variable to Lock to 310 Input. Otherwise, it should be set to Free-running which uses an accurate on-board
frequency reference to generate the output data rate.
6. Use the
310 Input Bit Rate
to set the 310 reference input data rate. This must be set to the correct value if you
have selected Lock to 310 Input as the 310 Output Clock setting, or if you are using the 310-to-ASI converter
as discussed in the next section.
When the 310-to-ASI converter is active and its input is from the ASI-to-310 converter, it is essential that you set
the 310 Output Clock to Free-running. If you set it to Lock to 310 Input, the converter would effectively lock its
310 clock to itself, which would produce unspecified and possibly non-compliant output signals..
310-to-ASI Converter Settings
There are two modes for the 310-to-ASI converter:
•
Packet Mode
— All the bytes of each TS packet are output consecutively, and fill characters (K28.5) are
inserted between packets. When there are no bytes ready for transmission, K28.5 characters are transmitted.
•
Byte Mode
— Each SMPTE 310 byte that arrives at the converter input is transmitted on the ASI output as soon
as it is ready. The timing and packet size present in the 310 input are preserved exactly in the ASI output. 310
Input Bit Rate sets the 310 input data rate to either 19.39 or 38.78Mbps. This must be set to the correct value if
you are using the 310-to-ASI converter. This same variable is available on the
ASI to 310 Settings
tab, since this
input can also be used as a frequency reference for the 310 output.
To set up the 310-to-ASI converter
1. Select the
310 to ASI
tab.
2. Use the
Output Packet Size
to adjust the number of bytes per packet in the ASI output.
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Страница 18: ...18 Hardware Overview ASI 310 User Guide v5 0 ...
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