Andrew ION-B Series, User Manual

Page: 30 / 181

30 ION-B User Manual
3.1. Introduction
The Main Tasks of the TFAx Unit:
Downlink (DL):
• Optical-to-RF conversion of the input optical signal
• Automatic Gain Control (AGC) of each converted signal, in order to compensate optical
losses;
• RF amplifi cation: the converted RF signal is boosted in order to maintain a good signal-to-
noise ratio
• RF fi ltering: a proper fi lter rejects the spurious emissions
• RF duplexing and splitting: the boosted RF signal is conveyed to 2 antenna ports
Uplink (UL):
• RF amplifi cation: a low noise amplifi er boosts the signal received from antennas in order
to maintain a good signal-to-noise ratio
• RF fi ltering: the boosted signal is cleaned of the spurious emissions
Fig. 3.1.1: ION-B Remote Units: different cases for different solutions
(a)
(b)
(d) (e)
(c)