Ericsson MINI-LINK TN R3 ETSI Technical Description page 32

MINI-LINK TN R3 ETSI
3.4.2.2 Functional Blocks
This section describes the internal and external functions of the LTUs with E1
interfaces, based on the block diagram in Figure 29 on page 26.
Figure 29
3.4.2.2.1 TDM
This block interfaces the TDM bus by receiving and transmitting the traffic
(nxE1).
3.4.2.2.2 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.
3.4.2.2.3 SPI
This block interfaces the SPI bus and handles equipment status. Failure is
indicated by LED's on the front of the unit.
3.4.2.2.4 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
start and short circuit protection, filter function, low voltage protection, DC/DC
converter and a pre-charge function.
26
TDM Bus
PCI Bus
SPI Bus
Power Bus
Block diagram for LTU 16/1 and LTU3 12/1
TDM
Interface
Control and
Supervision
SPI
Secondary
Power
voltages
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
12xE1 or
Line
16xE1
6662