Ericsson MINI-LINK TN R4 ETSI Technical Description page 32

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.
Figure 26
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
28
TDM Bus
PCI Bus
SPI Bus
Power Bus
Block diagram for LTU 32/1, LTU 16/1 and LTU3 12/1
TDM
Interface
Control and
Supervision
SPI
Secondary
Power
voltages
12/221 02-CSH 109 32/1-V1 Uen A 2008-03-14
12xE1,
Line
16xE1 or
32xE1
10033