Grass Valley Python 3G - Manual (Page 38)

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Python 3G Components
Python 3G Rear Panel Operation
Python 3G Rear Panel Operation
The Python 3G illustration is repeated for ease of use of this Guide. Note that all Python 3G
units operate in the same manner: the only difference is in whether the Fiber Optic ST
connectors are inputs or outputs.
Fig. 3-21: Python 3G Rear Panel
Area A - Rear Panel Power Connectors
The Python 3G provides for the use of redundant 12-18 Volts DC power supplies. A battery
backup option is not provided for the Python 3G unit.
Power can be supplied to the unit by either a 4-pin XLR connector from an external power
supply such as a ADAP-AC-04 or with direct wiring from a 12-18 Volt DC power supply
connected to the provided terminal block.
The main power supply can be of one type (XLR or direct wire) while the Aux power supply
is of the other type.
Fig. 3-22: Rear Panel Power Connectors
• 1 & 2 – Connectors for the Main 12-18 VDC power supply (XLR and Direct wire
terminal block)
• 3 & 4 – Connectors for the Main 12-18 VDC power supply (XLR and Direct wire
terminal block)
• 5 – MAIN/AUX Indicator LEDs:
• The LED for each power supply will be Green if power is being applied to the
Python 3G.
• If both Main and Aux are connected to a power source, both LEDs will be Green.
• A lit LED is not an indication of which power source is being used at the time; only
that the power source is good.
Redundant Power Supply Usage
The Python 3G power supply contains circuitry to detect which of the power sources (Main
or Aux) is producing the highest voltage and then uses that source to power the unit. If the
power sources are about the same, the Python 3G uses power from both.