Andrew CommScope ION-M17P Advanced, Руководство пользователя

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2. Introduction
Manual MF0145AXA.doc Manual for ION-M17P/19P Advanced 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.
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 6.7 mW.
2.2. The ION-M17P/19P Advanced
The fibre-optic distribution system is designed for AWS 1700 / 1900 MHz services.
Each fibre is able to operate services of up to four providers. One master unit can
operate up to 124 remote units.
An auto-levelling function for compensating different fibre losses and a
comprehensive supervision concept are implemented. Auto-levelling in the DL works
with optical power measurement, in the UL a 10.7 MHz signal is used for measuring
the optical loss.
The remote unit ION-M17P/19P Advanced is connected to a central master unit via
optical fibre lines. Specific customer designs for lamp pole or wall mounting are
available. Thus, the system provides many advantages in view of easy site
acquisition.
The ION-M17P/19P Advanced is supported from ION-M MC SW V6.50 onwards.