Ericsson 1553-FGC 101 1010 Uen A Instrukcje Operacyjne Strona 74

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Output Bit Rate
The output rate of the transport packets are derived from the 27 MHz reference clock and are accurate to within 1 kbps of the
configured bit rate (transport rate).
The output video bit rate of the VCM is configurable within ranges dictated by operating mode. The configured video rate means
transport rate. The rate control operates on the transport rate.
The module supports bit-stuffing to maintain configured bit rate if the operating mode requires it.
The output of a module never exceeds the configured bit rate (or bit rate ceiling).
PCR Placeholders
The VCMs enable a PCR placeholder to be put in the adaptation field of every video PID stream. See Appendices > Clock and Timing
> Program Clock Reference (PCR).
Transport Packets
The VCMs support adaptation field stuffing of transport packets for the alignment of PES packets to transport packet boundaries.
Valid continuity counter values are inserted into the transport packet headers.
Audio Output
Encoding
The audio encoding supports encoding at 48 kHz only.
The audio output is formed of fully compliant MPEG-2 transport packets encapsulated into a transport stream packet. The module
runs in aligned mode where there are an integer number of audio frames fitted into a PES packet, therefore a PES packet will be the
start of an audio packet.
The audio output rate is derived from the 27MHz reference clock.
Lip Sync
The Video Encoding module ensures that lip sync is maintained between the limits of audio leading video by 10 ms to video leading
audio by 30 ms.
PID Assignment
The module enables a PID to be assigned to each audio channel separately, which includes the ability to assign separate PID’s to
every mono channel. The PID value is configurable.
PCR Placeholders
The module enables a PCR placeholder to be put in the adaptation field of every audio PID stream. See Appendices > Clock and
Timing > Program Clock Reference (PCR)
Audio Reference Output Signal
A 48 kHz digital output reference signal is provided to enable an external audio encoder to be locked.
Transport Packets
© Ericsson AB 2011. All rights reserved
© Ericsson AB 2011. All rights reserved
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