Protected terminals | 153
11. Protected terminals
Monitored Hot Stand By (MHSB)
This section describes configuring the protected terminal in MHSB mode. A protected terminal in
MHSB mode comprises two radios interconnected using the tributary and RF switches as shown
below:
The MHSB switch protects terminals against any single failure in one radio. It also monitors the alarm
output of each radio and switches between radios if major radio link alarms occur.
The MHSB switch uses a CPU to monitor the alarm status received from both the connected radios'
alarm ports. When a relevant major radio link alarm is detected on the active radio (that is, transmitter,
receiver, power supply or modem), the CPU switches a bank of relays that switches all the interfaces
and the transmit port from the main radio to a functioning stand-by radio. The stand-by radio now
becomes the active radio.
The tributary switch and the RF switch are both a 19-inch rack-mount 1U high chassis. The total rack
space required is 6U. The MHSB switch option is available for the following bands: 300, 400, 700, 900,
1400, 2000, and 2500 MHz.
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