Ericsson MINI-LINK TN R4 ETSI, Technical Description

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Technical Description
3.5.3.2 Functional Blocks
This section describes the internal and external functions of the LTUs with E1
interfaces, based on the block diagram in Figure 26 on page 28.
10033
SPI
TDM TDM Bus
PCI Bus
SPI Bus
Power
Power Bus
Secondary
voltages
Line
Interface
12xE1,
16xE1 or
32xE1
Control and
Supervision
Figure 26 Block diagram for LTU 32/1, LTU 16/1 and LTU3 12/1
3.5.3.2.1 TDM
This block interfaces the TDM bus by receiving and transmitting the traffic
(nxE1).
3.5.3.2.2 Control and Supervision
This block interfaces the PCI bus and handles control and supervision. Its main
functions are to collect alarms, control settings and tests.
The block communicates with the NPU over the PCI bus.
3.5.3.2.3 SPI
This block interfaces the SPI bus and handles equipment status. Failure is
indicated by LED’s on the front of the unit.
3.5.3.2.4 Power
This block interfaces the Power bus and provides secondary voltages for the
unit. All plug-in units have a standard power module providing electronic soft
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