IRT produces a range of data distribution amplifiers
that operate at the 8, 34 & 45 Mb/s rates in
accordance with G.703. All incorporate a protection
switching facility for the switching in of signals from
a standby module when a fault is detected.
To facilitate this mode of operation, the
ZDA-3301RH provides all of the required signal and
logic interconnections between two modules.
The individual module alarms are also provided for
remote monitoring purposes.
Three switched outputs are provided at the rear of the
module with an additional output for monitoring
purposes on each front panel. The primary output is
controlled by relays to provide a bypass signal from
the input during a power failure. |
An Alarm Indication Signal (AIS) detected in the data
stream generates a changeover request for a
companion unit. In addition, the module may be
forced into bypass mode by an external signal.
Changeover-inhibit and changeover-request switches
are provided on the front panel for local manual
control. |
