Service manual

EDH control commands in the S
TELLAR
C-3
C
◆
EDH control commands in the S
TELLAR
General EDH is as default enabled in the S
TELLAR
so that it outputs EDH data received from
the encoder.
EDH commands You may, however, control EDH in the S
TELLAR
by using the ROSA control and
management system where the following modes exist:
The S
TELLAR
generates a correct CRC-word and outputs it together with the EDH
flags.
Example When the SDI input signal has CRC errors in the active picture, the P
OLARIS
sets the
EDH flag for the “AP” group, and issues the message “EDH flag activated here” to
ROSA. The S
TELLAR
forwards the EDH data in the SDI output signal with the EDH
flag set indicating that the codec detected an error. A new, correct CRC-word is
inserted by the S
TELLAR
, and the SDI signal may now continue in a chain of SDI
equipment with EDH support.
Parameter Explanation
OFF The S
TELLAR
does not analyze the EDH data and
does not output EDH on the SDI output.
Transparent The received EDH data is retransmitted without
changes. In that case the encoder and S
TELLAR
together are one EDH entity. If no EDH data is
received, either due to a Transport Stream loss or
when EDH is disabled in the encoder, the S
TELLAR
sets the UES flags active and clears all other flags.
This is the default mode of the S
TELLAR
.
Internal The S
TELLAR
does not analyze the incoming EDH,
but outputs an SDI signal with all flags cleared. The
status flags from the P
OLARIS
, if any, are ignored.
This is used for applications where the S
TELLAR
is
the first node in an SDI chain, which could be the
case if the P
OLARIS
has a composite input.