Ovrrbu-bts. Pdf

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BASE TRANSCEIVER STATION

AirLink 8000 1/30/00 BASE TRANSCEIVER STATION Release 1.00 2 - 22 1.11 GENERAL FUNCTIONS 1.11.2.1 Protocol between RBU and SU
1.11.2.2 Antenna

AirLink 8000
1/30/00
BASE TRANSCEIVER STATION
Release 1.00
2 - 21
1.10.2 Modifying System Configuration
All modification of the system configuration is done through the EMS and must occur without disruption
or impact to the service of current users. The EMS interface allows for the addition or deletion of DSCOs,
RBUs, and SUs. In the case of the SUs, additional modifications may be made to change the randomizing
code (unique to a single cell or sector) or change the frequency of operation to another of the four sub-
band frequencies within the same 14 MHz F.283-5 channel. The RBU is also capable of temporarily
discontinuing service to an SU for equipment repair or other reasons.
The over the air commands to the SUs may be made either individually, group addressed to a subset of the
deployed SUs, or to all SUs in a cell or sector. The code or frequency change procedures will utilize a
secure key system to ensure that unauthorized RBUs or imitators cannot instruct a change. Additionally,
before the final command for a change is sent out by the controlling RBU, the RBU requires each SU to
acknowledge that it has received the new code or frequency details and that a change is imminent. This
allows the genuine RBU to raise an alarm if it receives this acknowledgment unexpectedly from any SU.

AirLink 8000
1/30/00
BASE TRANSCEIVER STATION
Release 1.00
2 - 22
1.11 GENERAL FUNCTIONS
1.11.2.1 Protocol between RBU and SU
Command and status communication between the RBU and SU is provided via overhead control bytes
contained in the active channel frame or in a frame sent on a 32 kbps side channel.
1.11.2.2 Antenna
An antenna with an N-type female connector should be located as close to the Base Transceiver Station as
possible. This antenna may be mounted on a tower, pole, building or suitable structure.

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