Bird Technologies Manual 7-9570-1-1
(Rough Draft)
08/19/16 Page 11
RF downlink and uplink signals are found at the
four individual RF ports (N-type connector) shown
on the right side of the drawing. These are RF sig-
nals traveling to and from the users handheld units
via the DAS antennas. Uplink signals from the
handhelds are passed through the filter assembly
and are fed into the uplink side of the respective
VGA board. The signals are amplified by the VGA
board and combined as needed, with uplink signals
from other operating bands, using the 2-ways or 3-
way. After the signals are combined they are fed to
the input of the FOR board for conversion to optical
signals and sent to the master unit.
Downlink signals going to the handhelds enter the
DLL Remote Unit as optical signals from the mas-
ter unit at the FOR board. The FOR board converts
the optical signals into RF signals and outputs
them to the downlink 2-ways. The 2-ways split the
signals and apply them to the downlink amplifiers
on the VGA boards. The signals are amplified by
the VGA board, passed to the filter board, and out-
put through the RF connectors to the DAS antenna
elements.
OPERATION
Power is applied to the unit by plugging in the AC
power cord. There is no power on/off switch so the
unit will begin to boot-up immediately. The status of
the unit is indicated by the ON and ALM front panel
LED’s. Refer to
Table 3
for a detailed explanation
of the LED behavior.
The remote unit is software directed so control of
the unit is accomplished via a web based GUI
interface. The GUI interface is handled by the cen-
tral gateway computer connected to the master
unit. For convenience, access to the GUI interface
can be gained using the front panel LAN port on
the remote unit. However using this method for
interfacing is slower due to the speed of the optical
Figure 4:
DDL Functional block diagram.
