Operation Manual

System Description
12
Figure 7 BIU Interfaces
BIU
ALM
ON
DL/UL BTS 1
TP UL 1
EXTERNAL
ALARM
TP UL 2
DL OUT 1
UL IN 1
DL OUT 2
UL IN 2
DL/UL BTS 2


BIU
ALM
ON
DL/UL BTS 1
TP UL 1
TP UL 2
DL OUT 1
UL IN 1
DL OUT 2
UL IN 2
DL/UL BTS 2


Item Description
DL/UL BTS 1 / 2
Connection from the radio base station (RBS).
TP UL 1/2
Test port for the uplink of the DL/UL BTS port. The signal will be 3dB below
the DL/UL BTS port. Port is not valid on the simplex BIU.
DL OUT 1/2
Simplex downlink feed to the FOI.
UL IN 1/2
Simplex uplink from the FOI. The BIU will attenuate and/or amplify the signal
and then route to the DL/UL BTS port.
EXTERNAL ALARMS
Used for external alarm monitoring (DBI3xx, two slot version only).
ON/ALM LED
The LEDs indicate various states, see Table 7 .