Kramer Electronics SD-7108 - Manual (Page 13)

KRAMER ELECTRONICS LTD. 12
7 INSTALLATION
8 CONNECTING TO DIGITAL VIDEO DEVICES
Digital video sources and output devices may be connected to the SDI distributors through the BNC
type connectors on the back panel. SDI signals are very high frequency carrying signals, and are sensitive
to cable quality and length. SDI signals suffer from the “cliff effect” - where the signal might look good
after traveling a certain cable length, but when the line is extended with a few inches more - the signal
might crash completely, without any warning. Keep the length of the cables at the absolute minimum
required!
The machines described in this manual have built in provisions to minimize signal loss and
distortions. The SDI inputs have built-in cable equalization circuitries to compensate for high frequency
cable losses, as well as “time-base correction” - reclocking circuitries, which eliminate signal jitter
accumulated along the cables. The reclocking circuitry regenerates the signals, eliminating signal
instability and potential “cliff-effects”. With the built in equalization and reclocking circuitries, the
distributors can be operated using cable lengths of hundreds of meters, provided high quality cables are
used.
9 CONNECTING TO DIGITAL AUDIO DEVICES
Digital audio sources and output devices may be connected to the Digital Audio Distributors
through the detachable terminal block connectors or the BNC type connectors on the back panel. Digital
Audio signals have high frequency components, and are thus sensitive to cable quality and length, similar
to the SDI signals. Keep the length of the cables at the absolute minimum required! The machines
described in this manual have built in provisions to minimize signal loss and distortions. They have built-
in cable equalization circuitries to compensate for high frequency cable losses, as well as “time-base
correction” - reclocking circuitries, which eliminate signal jitter accumulated along the cables. The
reclocking circuitry regenerates the signals clock pulses, eliminating signal instability and potential “cliff-
effects”. The SD-7816 should be used if the digital audio system uses differential (balanced, 110Ω)
signals. The SD-7816B should be used if the system uses single-ended (unbalanced, 75Ω) signals.
10 TURNING ON THE MACHINE
NOTES
1) The machine should only be turned on after all connections are
completed and all source devices have been turned on. Do not
attempt to connect or disconnect any video signal to the
machine while it is turned on.
2) The socket-outlet should be near the equipment and should be
easily accessible. To fully disconnect equipment, remove the
power supply adapter from the mains socket.
1) Connect the machine's mains socket to the wall socket using the power cord (provided with the
machine).
2) Operate the source and the acceptors.