Service Manual

GSM-205-323
RF equipment detail
31st Oct 01
Technical Description: Horizon macro indoor
68P02902W07-B
CONTROLLED INTRODUCTION
Tech. 5–1
RF equipment detail
Overview of RF
equipment
This chapter describes the functional operation of radio frequency (RF) modules
used in the cabinet. All descriptions are presented at a block diagram level.
RF modules described
The following equipment is described:
 Compact Transceiver Unit (CTU).
 Sectorized Universal Receiver Front-end (SURF) module (for receive
path), both single and dual band variants.
 Several types of transmit block (Tx block). Tx blocks are used for various
configurations of transmit path, depending on number of antennas, CTUs
and functionality, including potential shared receive path.
 Cavity combining block CCB, used to combine three CTU transmit paths in
conditions where Synthesizer Frequency Hopping (SFH) is not required.
Two CCBs can combine up to six CTU transmit paths on to a single Tx
antenna.
RF general information and loopback test function
The following additional information is presented in this chapter:
 General definition of transmit and receive functions in this RF equipment
detail section.
 An RF overview and RF test function description in the next section.
 An explanation of CTU frequency hopping in a section immediately after
the CTU section.
These descriptions are intended to assist the reader in understanding the
information on the RF modules.
RF
specifications
All equipment meets or exceeds ETSI regulations. Frequency information is
listed in the Specifications part of this manual.