Grass Valley DHP v.1.1 - Manual (Page 14)

6
Introduction
DHP Summary
8500H-IP-3G-DEM-CX (disembedding, input)
8500H-OP-3G-EMB-CX (embedding, output)
8500H-OPX-3G-EMB-CX (embedding, expansion output)
[There are no fiber-optic hybrid cards at this time.]
Note: ports belonging to the DHP core cannot be used as routable inputs or outputs. Panel
operators cannot route to them or from them directly.
Other DHP Considerations
Tielines
The NV8500 router that DHP is servicing might involve some tielines. You must identify the
inputs and outputs of all tielines in a DHP configuration (initialization) file.
Force Embedder Off
The DHP configuration allows you to specify, for some inputs, that when they are routed to
embedder outputs, the embedder is forced off (i.e, the embedder is bypassed). In such a case,
the audio from the input is kept intact and passed through the output without change. This
option is controlled by “EO” commands in DHP’s port configuration files.
It might be a point of confusion that, in MRC, there is just the opposite function: some inputs in
the router are configured to force any embedding output to use its embedder, rather then let
the router follow switching rules to determine the embedder state.
If your router uses DHP, it is imperative that you do not ever use the “force embedder ON” func-
tion in MRC.
ASI Signals
You must identify ASI inputs and ASI outputs in a DHP initialization file.
See ‘HybridPorts’ Files on page 16 for detail.