The DDA-3312 is a data distribution amplifier that
may be used with either ASI or SMPTE SDI 270
Mb/s signals.
Four outputs are provided at the rear of the module
with an additional output for monitoring purposes on
the front panel. The primary output is controlled by
relays to provide a bypass signal from the input
during a power failure.
The DDA-3312 incorporates a protection facility for
switching two outputs to signals from a companion
DDA-3312 when a fault is detected.
In SDI mode a loss of input or EAV is used to
indicate failure.
In ASI mode a loss of input or absence of 188/204
byte packet sync is used.
In both modes an overriding changeover request may
be made either locally or by remote control. |
Indicators are provided on the front panel for:
SDI signal detected
ASI signal detected
ASI signal inverted
Data loss
Module in service
Module in standby
External alarm signals are also available on the rear
of the module.
Changeover-inhibit and changeover-request switches
are provided on the front panel for use where
modules are linked in pairs for redundancy.
For this configuration, a special double width rear
assembly (type ZDA-4311RH) is required to link the
signal and logic sections of two modules. |
