Ericsson MINI-LINK TN R3 ETSI Technical Description page 36

MINI-LINK TN R3 ETSI
TDM Bus
PCI Bus
SPI Bus
Power Bus
Figure 32 Block diagram for LTU 155
3.5.2.1.1 TDM
This block interfaces the TDM bus by receiving and transmitting the traffic
(nxE1) and DCN channels (nx64 kbit/s).
3.5.2.1.2 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.
The block holds a Device Processor (DP) running plug-in unit specific software.
3.5.2.1.3 SPI
This block interfaces the SPI bus and handles equipment status. Failure is
indicated by LED's on the front of the unit.
3.5.2.1.4 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.
30
TDM
Control and
Supervision
SPI
Equipment
Secondary
Power
voltages
BPI (MSP 1+1)
MS/RS
VC-12
VC-4
SDH
Clock
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14
STM-1
6663