19MN024-010
2.3. The ION-B Master Unit
The ION-B Master Unit is a widely-fl exible system. Its modular feature allows it to be developed
both for simple installation-friendly, unobstrusive applications to complex installations, involving
a virtually unlimited number of subracks, and distributed through several fl oors of a building or
through a 20km distance.
The following text presents a brief overview of the components of these units.
The TPRF31 Fast MiniRack is a 19” x 1HE fast-
MiniRack housing 2 slots: it can therefore
accommodate 2 of the single-slots (7TE x 4HE)
ION-B cards presented in the following. Thanks to
its turnable brackets, the TPRF31 is suitable both
for wall and rack-mounting, and can therefore be used both as a stand-alone unit (for simple
ION-B installations) and as an integration of a bigger and more complex ION-B system .
The TPRN sub-rack is a 19”x 4HE subrack with 12
slots, each one sized 7TE x 4HE. As each ION-B
module takes up one or two slots, each Master
Unit can host up to 12 modules, depending on
the design confi guration and requirements.
The Master Optical TRX (TFLN): in downlink, it provides an RF-to-optical
conversion of the signal coming from the BTS, and transmits it to 4 optical
outputs, so as to feed 4 TFAx. In uplink, it provides optical-to-RF conversion for
4 optical signals coming from the RUs, and it combines them into a single RF
output, while providing automatic gain control in order to balance the fi bre
losses. Module dimensions:
Width = 7TE, Height = 4HE (one slot in the master unit sub-rack).
The Duplexer (TDPN): it combines the downlink (DL) and the uplink (UL)
paths into a single one, while maintaining the required isolation. The module
dimensions are: Width = 7TE, Height = 4HE
Fig. 2.4 TPRN subrack
Fig. 2.5 TFLN card
Fig. 2.6 TDPN card
Fig. 2.3 TPRF31 subrack
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