Figure 4-18
UPEUb panel
(1) BBU power switch
Figure 4-19
UPEUc panel
(1) BBU power switch
NOTE
The UPEUa and UPEUb are differentiated by the silkscreens on the panels, which display
-48 V
and
+24
V
respectively. The UPEUc has
UPEUc
label, which is different from the UPEUa.
Functions
The UPEU performs the following functions:
l
Converts -48 V DC or +24 V DC power into +12 V DC, which is the operating voltage of
the boards.
l
Provides two RS485 signal ports with each transmitting one RS485 signal and two Boolean
signal ports with each transmitting four Boolean signals.
LED
The UPEU has one LED, which indicates the operating status of the UPEU.
the LED.
4 BTS3900 Components
BTS3900
Hardware Description
4-26
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Issue 04 (2011-02-15)