IQUDC30/IQUDC31/IQUDC32/IQUDC33
Operation Using the RollCall Control Panel
Issue 1 Rev 4
Page 87
© 2016 SAM
5.15 Ancillary Bridge-Ch1,Ch2
The Ancillary Bridge allows detection of packet based ancillary data and re-insertion on the
output (unaltered). This should not be used for packet types already processed (708, RDD08,
SMPTE2016, SMPTE2031, ATC) by the ancillary data block. The exception is in processing
SD-ATC, where you should use the bridge.
You can select the ANC packet type to be transferred and the line number at the output on
which the transferred packet is to appear, then the bridge operates automatically when
enabled.
5.15.1 Operation
1.
Select the ANC packet type to be transferred using the DID and SDID Input Controls.
2.
Select the output line using the Output Control (default is 11).
3.
Check the Enable box in Output Control (default is enabled).
5.15.2 Warnings
•
The ANC bridge can only transfer up to seven different ANC packet types.
•
For each of the seven ANC types, only one packet can be handled at a time. When a
packet has been read from the input, until its nominated output line occurs and the
packet is read from the store, any other packets of the same type are ignored. No line
number is reported for a packet which has been ignored.
•
No changes can be made to the ANC packets; they are forwarded exactly as
received.
•
There is no control to reset the stores. When not in use they should left reading DIDs
which never occur such as 0 or 255 so that old packets aren't transmitted when the
output line numbers are programmed.
•
There is no check of remaining ancillary space at the start of a packet transmit. ANC
packet length is from 4 to 259 words but the packet lengths are not reported to the
CPU. Errant packets are corrupted by the syncs they try to overwrite.
