User manual

DTS Broadcast PDH Microwave Digital Radio User Manual
-17-
3 Options
3.1 Protection Systems
The L54 Digital Microwave Radio linking is operated in protected
configuration by the addition of an indoor rack-mounted protection switching shelf and another standby
radio terminal.
The ODU arrangements may use either one antenna with a waveguide coupler or two antennas.
The switching protection shelf may be operated in one of three modes:
Hot-Standby
Only one transmitter is on-line at any one time. Both main and standby terminals are tuned to the
same frequency.
A fault detected in the on-line radio terminal results in a switch of traffic to the off-line radio
terminal.
The ODU arrangements may use either one antenna with a waveguide coupler or two antennas.
Frequency Diversity
The main and standby radios are transmitting simultaneously and are tuned to different
frequencies to avoid interference. A fault detected in a traffic-carrying radio terminal results in a switch
of customer traffic to the standby radio link.
The ODU arrangements may use either one antenna with a waveguide coupler or two antennas.
Space Diversity
The main and stand-by radios are set up in Hot Stand-by mode, but are connected to their own
antennas. The spatial separation of the antennas, combined with hitless receive switching, provides the
Space Diversity function on the receiving end of the link.