Adtec digital YUV2QAM (version 01.02.01) Manual - Manual (Page 33)

How to Connect via FTP
FTP connections can be made to the adtec device using any ftp client.
Host:
Default Username: adtec
Default Password: none
Port: 21
FTP is only useful for collecting logs from the device.
How to Use API Commands
The Adtec YUV2QAM device is unique in that it handles two physical encoders. To
accommodate commands for controlling both encoders, you will need to specify which
encoder you are working with for each command you issue.
Please make the following adjustments:
● Instead of using *.ECMD as noted the API descriptions, you will need to use.
○ *.ECMD0 to specify the first encoder.
○ *.ECMD1 to specify the second encoder.
Example: (*.ECMD0 TRA) will give you the transport status of the first encoder.
How TMR is Configured
TMR (Transport Stream Mux Rate) is controlled by the modulator’s clock.
When in Annex B mode, the rates listed below will be configured and can not be changed.
Annex B QAM 256 the TMR is set to 38.810671 bps.
Annex B QAM 64 the TMR will be set to 26.970186 bps.
When in operating in Annex A mode, the symbol rates are adjustable and that in turn
affects the configured TMR. The higher the symbol rate, the higher the data rate.
How Video Rates are Configured
Video rates can be configured manually or automatically. The factory default is to
automatically set the video rate based on TMR. This option is referred to as VAF (Video
Autofill). VAF determines what the TMR is. It reserves 3.5% for null packets. It detects
the video input resolution for each channel. It automatically calculates the required
headroom for audio pids. It sets the video bit rate for each channel accordingly to maximise
available bandwidth.
SD encode bitrate = 1.00 to 15.00 Mbps
HD encode bit rate = 7.00 to 60.00 Mbps
Example:
TMR is set to 40 Mbps.
Channel 1 has a SD 720x480i source.
Channel 2 has a HD 1920x1080i source.