EXPRESS DAS
Installation and Operations Manual
18
EXPRESS DAS Installation and Operations Manual – Version 2.2 November 2013
3.2.1
Main Drive BTS Unit (MDBU)
The MDBU delivers downlink signals from the base station or BDA to mobile devices, and it delivers
uplink signals from the devices to the BTS or BDA. The unit monitors downlink input levels and can
automatically adjust input attenuation (ATT) using an Automatic Gain Control (AGC) function. It also uses
attenuation to adjust the uplink gain.
A green LED on the front panel indicates power to the unit as well as power to the individual modules. A
red LED indicates an alarm condition, meaning the module is connected to a signal source but there is an
abnormal signal level.
Figure 3.4 – MDBU at a glance
The MONITOR SMA ports seen at the MDBU front panel enable you to check the current
levels of the downlink input and uplink output signals in current service without affecting the
main service signals.
THESE PORTS ARE USED FOR TESTING PURPOSES ONLY.
All
signal source connections are done on the back of the MDBU.
Содержание EXPRESS Single-Carrier DAS
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