Grass Valley 8977AP-4B - Manual (Page 12)

12 8977AP-4B/4U — Instruction Manual
Installation
8900GEN-SM Genlock Submodule Installation
Conditions
Before installing the 8977AP module, you will first need to determine if and
how you want to use a genlock reference or the available frame reference
buses. The genlock timing from an 8900GEN-SM submodule can be uti-
lized in several ways. Refer to 8900GEN-SM GeckoFlex Genlock Instruction
Manual available online for a complete overview of using the genlock ref-
erence.
In addition to the capability of providing a local external reference to this
specific 8977AP module with an 8900GEN-SM submodule installed, slots 1
and 3 of the GeckoFlex Frame have been specifically designed to distribute
an independent frame bus reference transmitted from the 8900GEN-SM
submodule mounted on another GeckoFlex module with this capability
configured for this purpose.
If another module with a genlock submodule installed has already been
configured and installed for frame bus distribution, you may configure this
module’s output timing to lock to the Frame Bus 1 or Frame Bus 2 reference
from the other 8977AP module. In this case, the 8977AP module does not
require the use of an additional 8900GEN-SM submodule.
The use of the genlock reference is determined by the setting of the Output
Timing on the System Config web page of the module and module place-
ment in the frame and jumper configuration as summarized below:
• Local Reference – the 8977AP with an 8900GEN-SM submodule can
have a local external reference connected to the corresponding Refer-
ence In BNC. This external timing reference will be fed to this specific
8977AP module only.
• Frame Reference 1 or 2 – when an 8977AP with an 8900GEN-SM sub-
module is installed in slot 1 and/or slot 3, a frame timing bus can be
enabled to distribute the external reference connected to the corre-
sponding Reference In BNC on the rear module to all modules in the
frame that can accept a genlock reference. Slot 1 provides Frame Bus 1
and slot 3 provides Frame Bus 2.
• Internal – when no 8900GEN-SM submodule is installed on the 8977AP
module, the Output Timing can be set to Internal so the output timing
will be in an internal freerun mode (delivered by a local oscillator).
Note The internal mode is mainly implemented for test and debug purposes during
the system setup of the module or in a standalone configuration where no
timing reference is required.