GRASS VALLEY Concerto, Instruction Manual

Page: 28 / 174

28 Concerto — Instruction Manual
Section 1 — System Description
Mixed Module Matrices
The Analog Audio module has Analog to Digital and Digital to Analog
converters built into the module. This allows the configuration of physical
matrices that contain Analog Audio modules and Digital Audio modules.
These mixed audio matrices work the same as regular matrices with all
inputs available to all outputs.
When configuring a level or matrix that contains both Analog Audio
modules and AES Digital Audio modules use settings for AES Digital
Audio for all the modules in the grouping.
The Digital Video modules SD and HD can be combined into a physical
matrix. All SD video signals can be routed through either module making
SD video available to all inputs and outputs. The HD signal (1.485 Gbs) can
only be routed through the HD module.
CAUTION The maximum number of HD modules that can be in a 7 RU Concerto frame
is three in which case the fourth slot has to remain empty. If two HD modules
are used then the other two slots can be loaded with any of the non HD mod-
ules.
When configuring a level or matrix that contains both SD and HD Digital
Video modules use settings for SD Digital Video for all the modules in the
grouping. The Analog Video module can not be mixed with Digital Video
modules in the same level but can be in the same frame as a separate level.
The Port module can be used as either a TimeCode module or a Port
module. TimeCode and Port cannot be mixed in the same level.
Controller Module Identification
Controller (CM) modules are designed to work in pairs (one primary, one
backup) to provide failure resistance. The primary CM provides all
required functions; the backup is ready to take over should the primary
unit fail. Control logic facilitates the orderly change of control between the
two modules and ensures that only one module at a time controls the
external serial busses.
Control consists of the messages created and sent to the CM to set matrix
crosspoints, and the return messages from the CM containing true tally
status back to the control system.
The CMs can be inserted into a powered frame. To ensure that the system
power supply is not disturbed, a pre-charge resistor is connected in series
with one of the rear connector pins. The corresponding pin on the back-
plane connector is longer than any of the other power pins. This allows the
pre-charge pin to make connection before the others.