User's Manual

Sub Unit Overview AR Standard Repeater
044-05250 Rev A 1-7
Sub Unit Overview
A number of amplifier boards are individually shielded and located under a metal cover inside
the repeater. This cover can be opened outward for access. These amplifier PCBAs are of
different types depending on the supported system. All of the repeater types are built up with
a number of sub units which are described in the following paragraphs.
Channel Amplifier PCBA for GSM and EDGE (CHE)
The CHE is used for CSel operations. CSel GSM repeaters can handle up to eight channels.
For every even number of channels, two CHEs are required, one for the uplink and one for the
downlink. Numbered from left to right, positions 1 and 2 are used for two DL CHEs and 3 and
4 for two UL CHEs. Each repeater channel is allocated to a radio channel or switched off. In a
GSM system, each repeater channel can handle eight calls (sixteen if half-rate encoding is
used).
CDMA/WCDMA Segment Amplifier PCBA (CSA)
CSel CDMA/WCDMA repeaters can handle two CDMA or WCDMA repeater channels. The
CSA provides this capability. For every even number of channels, two CSAs and two PAs are
required; one pair of CSA/PAs for the uplink and one pair for the downlink. Each repeater
channel is allocated to a radio channel or switched off. Numbered from left to right, position 1
is used for a CSA, position 2 for a DL PA, position 3 for a CSA and position 4 for a UL PA.
Band Selective Amplifier PCBA (BSA)
The BSA is used for BSel operations. BSel repeaters can handle multi-carriers over a wide
band through the use of an adjustable bandwidth. Each repeater band requires two BSAs and
two PAs; one pair of BSA/PAs for the downlink and one pair for the uplink. Numbered from left
to right, position 1 is used for a DL BSA, position 2 for a DL PA, position 3 for an UL BSA and
position 4 for an UL PA.
Power Amplifier PCBA (PA)
The PA is used to amplify the output signal from a BSA and a CSA. Each PCBA contains one
path that can be used for either DL or UL amplification. Two PAs are thus required for one band
for the downlink and uplink.
Booster Amplifier (BA)
CDMA/WCDMA repeaters can be equipped with a BA on the DL path to boost the output gain
by 6dB (typically). The BA can operate with a maximum of 2 channels and occupies position
3 in the cabinet and position 7 in a high cover. It also requires an extra heat sink element on
the outside of the cabinet or high cover. Some configurations use the existing PSU while others
require a second PSU.
Distribution PCBA (DIA)
The DIA is a distribution PCBA on which all other PCBAs and units are connected to in the
cabinet. A shielded metal frame on the DIA provides the mounting location for the CU, ALI and
RCIs, if used.
Control Unit PCBA (CU)
The CU PCBA, illustrated in Figure 1-3, is the core microprocessor controller PCBA in the AR
repeater and connects to port P2 on the DIA. It contains a microprocessor, main memory,
flash memory for the CU software, EEPROM memory for parameters, memory for the event
log and statistics, a REFO reference oscillator, ports for local and remote communication,
battery powered real-time clock, and MAC identity circuit.
The CU supervises and controls operational parameters such as gain control and channel
handling, alarms, event log, password and logon. It is also a control interface for OM-Online
and OMS. Software for the CU can be downloaded from OM-Online, either locally or remotely,
or from OMS.