Grass Valley DHP v.1.1 - Manual (Page 12)

4
Introduction
DHP Summary
Expansion output cards provide 9 outputs. Expansion output backplanes have 9 connectors and
two 28-pin expansion connectors. Expansion filler cards provide no outputs, but support the
expansion connections. Cables connect the 2 router frames on the expansion connectors.
DHP Summary
DHP (dynamic hybrid pathfinding) allows the NV8500 router to perform hybrid routing with
relatively few hybrid cards. With DHP, the router passes standard inputs through an internal pool
of hybrid disembedder cards and embedder cards after which the audio from the standard
inputs can be recombined and re-embedded on output.
The point of DHP is that it allows you to populate the router with many relatively inexpensive
standard I/O cards and a few hybrid cards and still have the benefits of hybrid routing (that is, to
allow audio from standard inputs to be disembedded and re-embedded for standard outputs,
all within the router).
DHP is a service that resides in the NV9000. The NV9000 control software treats the DHP service
as if it were a hybrid router.
The DHP service then communicates with the router directly. All takes to a hybrid router go
through the DHP service, transparently. All status from the router also goes through the DHP
service.
DHP is licensed software (EC9540) that ships with the NV9000. The purchase of the license
allows you to activate the DHP service in the NV9000. See
Activation on page 7.
 If you have an older version of the NV9000 software that does not include DHP, you will need
to obtain an updated version of the NV9000 software.
Figure 1-1 shows a fairly typical route using DHP:
Fig. 1-1: DHP Scenario — Recombining Audio from Standard Input
Control System
Software
DHP
Hybrid
Router
NV9000
Std In
Std Out
Std In
Std Out
Std Out
Std In
DIS
DIS
DIS
Std In
EMB
Std Out
This scenario combines audio from 3 separate standard
inputs and routes the video from one of the inputs with
the combined audio on a standard output.
A disembedder port is required for each standard input
port from which audio is to be extracted. An embedder
port is required for the output that is to receive the
recombined audio.
Further, an additional standard output port is required
for each standard input port from which audio is to be
extracted. An additional standard input port is also
required for the output that is to receive the recombined
audio.
The DHP service routes the signals through a pool of
available hybrid cards internally. External cabling is
required for every DHP path.