Grass Valley Python 3G - Manual (Page 6)

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About Python 3G
About the Python 3G System
About the Python 3G System
The Python 3G transmitter multiplexes a number of HD/SDI signals into a fiber optic
transport stream. The number of signals can be 4, 8, 12, or 16 – always in multiples of four.
Similarly, the Python 3G receiver de-multiplexes a corresponding number of fiber optic
signals into HD/SDI.
The method of fiber optic signal transmission can use one-for-one pass through conversion
of each HD/SDI signal or CWDM (course wavelength division multiplexing) for up to 16
HD/SDI signals combined into a signal fiber optic cable.
In addition to Python 3G transmitter and receiver models, Transceivers are also available
which allow various combinations of transmit and receive in the same unit. Please see
Available Models on page 8 for the model list.
Python 3G units accept electrical digital signals (via BNC), ranging from 19.4 Mbps up to
3Gbps-uncompressed HD/SDI.
Along with LEDs to indicate the presence of an HD/SDI signal at each BNC input and output,
the Python 3G features an integrated optical power meter for monitoring the received
power for each optical HD/SDI signal. Fiber optical power is measured only at the receiver
end of the signal path.
Figure 1-1 is a conceptual overview of an example Python 3G signal path.
Fig. 1-1: Python 3G Conceptual Overview
The Python 3G also features dual 12-18 VDC power inputs for electrical redundancy. Up to
3Gbps is supported on each optical channel.
The Python 3G handles a wide range of digital video rates. Supported formats include:
• 3 Gb/s HD/SDI: SMPTE 424M
• 1.5 Gb/s HD/SDI: SMPTE 292M
• 143 Mb/s: SMPTE 259M