Ericsson MINI-LINK TN R3 ETSI Technical Description page 102

MINI-LINK TN R3 ETSI
5.2.1.4 Power
The external power supply, –48 V DC, is connected to the unit.
This block provides secondary voltages for the unit and a stable voltage for the
RAU, distributed in the radio cable. It also provides input low voltage protection,
transient protection, soft start and electronic fuse to limit surge currents at
start-up, or overload currents during short circuit.
5.2.1.5 Multiplexer/Demultiplexer
This block interfaces the Line Interface and the Ethernet blocks by receiving
and transmitting the traffic.
It performs 2/8 and 8/34 multiplexing, depending on the traffic capacity, for
further transmission to the Radio Frame Multiplexer.
In the receiving direction, it performs 34/8 and 8/2 demultiplexing, depending
on the traffic capacity. The demultiplexed traffic is transmitted to the Line
Interface and the Ethernet blocks.
5.2.1.6 Control and Supervision
This block handles system control and supervision. Its main functions are to
collect alarms, control settings and tests. It also holds an IP router for DCN
handling.
For the traffic over the hop it handles BER collection and communicates with
processor in the RAU through the RCC.
Exchange of control and supervision data over the hop is made through the
HCC.
5.2.1.7 Radio Frame Multiplexer
The Radio Frame Multiplexer handles multiplexing of different data types into
one data stream, scrambling and FEC encoding.
The following data types are multiplexed into the composite data stream to
be transmitted over the radio path:
•
•
•
Traffic
The transmit traffic data is first sent to the multiplexer to assure data rate
adaptation (stuffing). If no valid data is present at the input, an AIS signal is
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Traffic
Data Communication Channel (DCC)
Hop Communication Channel (HCC)
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