User's Manual

NOTE: External encoder required for bit rates in yellow highlight.

Other factors that impact the total available bit rate are the code rate

and the guard interval settings.

Coding Rate Setting: This setting determines the amount of forwa rd

error correction used to reduce video data loss under adverse conditions .

If the code rate is set to ½, this means that half of the available data rate

is being used for error correction, while the rest is available for video. A

code rate of 1/2 uses the most bandwidth for error correction, but

provides the highest degree of protection against video breakup.

Guard Interval: The primary purpose of the guard interval is to provide

resistance to multipath and co-channel interference. Longer guard

intervals are used in dense metro areas, where high levels of multipath

are expected. A guard interval of 1/4 is the longest, while 1/32 is the

shortest.

NOTE: W hen programming an HDX-1100, a good rule of thumb is to

program several presets with varying amounts of error correction to be

able to quickly switch quickly from a very robust, low data rate setting, to

a less robust but higher-speed setting.

6.5 VIDEO AND AUDIO INPUT SETUP

The video and audio inputs must be configured for each preset. To initiate this procedure,

click on MPEG-2 or MPEG-4 in the bar at the top of the screen, and then click on Video on

the left side of the screen. Two dialogue boxes will appear: Video In, and, Encryption.

See next graphic for details.

IMPORTANT: When equipped with the MPEG-2 encoding option, HDX-1100 presets may

be programmed all in MPEG-2 mode, all in H.264/MPEG-4 mode, or as a mix of the two. For

example, the first five presets may be programmed for MPEG-2 encoding, while the

remaining four are programmed for H.264/MPEG-4 encoding.

Video Settings: Click on Video In and select the desired parameters from the drop

down table. Available parameters include the input configuration, such as composite or

SDI, as well as video resolution. MPEG-2 settings differ from MPEG-4 settings, and

require additional choices to be made, including

NOTE: Input A is the normal video input and must always be set up. When using the