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QMultiFlex-400™ Installation and Operating Handbook
6.2.8.1 BUC Interface
BUC FSK
This indicates that a BUC is fitted that has FSK communications to the
modem.
BUC
no
This indicates that a BUC is fitted but has no communications to the
comms
modem.
No BUC
This indicates that no BUC is connected.
6.2.8.2 BUC LO Frequency
Range:
-99.999GHz to 99.999GHz; step size: 0.0000001GHz (i.e. 100Hz)
Description:
This is the local oscillator frequency of the BUC.
6.2.8.3 BUC Attenuation
Range:
0dB to -15.0dB; step size: 1dB
Description:
This varies the front-end attenuation applied by the BUC. This is used
when there is a low level of signal loss between the modem and BUC in
order to prevent the modem output from saturating the BUC. FSK control
required.
6.2.8.4 DC to BUC
This is an On/Off control used to enable and disable the DC power supply from the modem
to the BUC. Voltage depends on what BUC PSU is installed (i.e. 24V or 48V).
6.2.8.5 10MHz to BUC
This is an On/Off control used to enable and disable the high-stability 10MHz reference
from the modem to the BUC.
6.2.8.6 Mute BUC Services in Standby
This is an On/Off control used to enable and disable the transfer of BUC DC and 10MHz
services from a failed modem to a backup modem in a 1:1 or 1:N redundancy system.
Setting the checkbox causes the services to switch over from the online modem to the
backup modem on a failure. Note that FSK communications will always be switched over.
Table 6-23 BUC Interface
Table 6-24 BUC LO Frequency
Table 6-25 BUC Attenuation
6-31
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