User's Manual

2 Introduction
Page 13
2 INTRODUCTION
2.1 PURPOSE
Cellular telephone systems transmit signals in two directions between base
transceiver station (BTS) and mobile stations (MS) within the signal coverage area.
If weak signal transmissions occur within the coverage area because of indoor
applications, topological conditions or distance from the transmitter, extension of the
transmission range can be achieved by means of an optical distribution system.
Such a system contains an optical master unit and several remote units. The number
of the remote units depends on the hardware and software configuration. The remote
units are connected to the master unit with optical links. The optical loss must be less
than 10 dB inclusive optical couplers or splitters.
The master unit is the connection to the base transceiver stations. The configuration
of a master unit depends on the number of the remote units and the frequency range.
The optical transmission uses WDM-systems with a wavelength of 1550 nm in the
Uplink and 1310 nm in the Downlink.
2.2 ION-M17P/17P/17P
Andrew Solutions ION-M17P/17P/17P is a 3 sector single-box remote unit. It is used
in conjunction with a master unit in the ION optical distribution system. This system
transports 3 sectors (3 x 1700/2100 MHz) simultaneously, providing a cost-effective
solution for distributing capacity from one or more base stations.
The ION-M17P/17P/17P transports signals on the RF layer in a very inexpensive
manner. This means that multiple operators and multiple technologies are moved
simultaneously from a cluster of base stations to a remote location over the same
fibre.
The ION optical distribution system is a cost-effective coverage solution for dense
urban areas, airports, high-rise buildings and other locations where physical
structures increase path loss or provide limited space for installation. It has been
specifically designed to reduce zoning problems and to provide homogeneous
coverage. The compact, mechanical design is specifically architected to mount inside
of or on poles and along side structures in such a way that it has a minimal visual
impact.
The ION-M platform has been specifically tested and optimized for CDMA2000.
Furthermore it is provisioned for future improvements to the modulation and
frequency bands.