User's Manual

Repeater Design
The repeater is housed in a cast aluminium chassis that is waterproof,
class IP65, for outdoor use. The chassis has a design suited for outdoor
use as well as indoor use.
The chassis consists of a cabinet and a cover joined with hinges. The
cabinet contains the repeater circuitry. The cover can either be a thin
cover or a large cover. The latter consists of another cabinet which can
be used as an empty cover or be equipped as an independent repeater
system.
The cover has two external LEDs for operation and alarm indication.
The cabinet as well as a large cover can be equipped for channel selective
operation or band selective operation. A combined repeater is normally
equipped for channel selective operation in the cabinet and band selective
operation in the cover.
Different amplifier boards are used to get the various operations (see
below). The amplifier boards are individually shielded and located under
metal cover sheets which can be folded out.
Channel selective GSM amplifier boards
Channel selective GSM repeaters can handle up to eight repeater channels
(four if the CU part number is K103/1). For every even number of
repeater channels, two CHA amplifier boards are required in the repeater,
one CHA board for uplink signaling and one board for downlink signaling.
Each repeater channel is allocated to a radio channel or switched off. In a
GSM type TDMA system (GSM, EGSM, DCS1800 or PCS1900), one
repeater channel can handle eight calls (sixteen if half-rate encoding is
used).
Channel selective CDMA amplifier boards
Current CDMA repeaters can handle two CDMA repeater channels. For
every even number of repeater channels, two CSA amplifier boards and
two PA amplifier boards are required in the repeater, one pair of CSA/PA
boards for uplink signaling and one pair for downlink signaling. Each
repeater channel is allocated to a radio channel or switched off.
Band selective amplifier boards
Band selective repeaters can handle one wide band repeater channel. The
band width is either fixed or adjustable (fixed for 900MHz repeaters only).
A band selective repeater channel requires two BSA boards and two PA
amplifier boards in the repeater. One pair of BSA/PA boards for uplink
signaling and one pair for downlink signaling.
ALLGON System AB AR Repeaters & OMT32 Hardware – Functional Description
User’s Manual VD202 90/EN Rev. 1A 1999-07 5 - 2