User's Manual

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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.
WDM (Wave Division Multiplex) filters are integrated in the optical modules. For the
UL, a wavelength within 1546 nm – 1550 nm is used. For the DL, a wavelength of
1310 ±10 nm is used. The maximum output power for the UL and DL is 5.7 mW.
2.2. THE ION – M 19P/19P/19P SINGLE SOURCE / 3-SECTOR
The ION-M19P/19P/19P is a three-sector remote unit (RU). It is used in conjunction
with a master unit in the ION optical distribution system. This system transports 3
sectors simultaneously 3 x 1900 MHz, providing a cost-effective solution for
distributing capacity from one or more base stations. Beside 3 – sector mode the
system can be switched to single source operation. In this operation mode no
frequency conversion is used, but one input signal (single source) is split to 3 output
signals. Purpose of this mode is to support the possibility of quasi omni directional
radiation. Together with a phase detection box the system is able to detect phase
differences between the RF feeder cables to the antennas and to adjust phases
such, that the phase differences are compensated, i.e. phase differences are 0° after
phase adjust. This process is running automatically, when initiated by a “button to
push”
The ION-M19P/19P/19P 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
fiber.
The ION-M (I
ntelligent Optical Network) optical distribution system is a cost-effective
coverage solution for dense urban areas, airports, campus, 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