Basic Node
3.6.2.1 Functional Blocks
This section describes the internal and external functions of the LTU 155,
based on the block diagram in Figure 28 on page 31.
6663
SPI
TDM
TDM Bus
PCI Bus
SPI Bus
Power
Power Bus
Secondary
voltages
VC-12
STM-1
MS/RS
VC-4
SDH
Equipment
Clock
BPI (MSP 1+1)
Control and
Supervision
Figure 28 Block diagram for LTU 155
3.6.2.1.1 TDM
This block interfaces the TDM bus by receiving and transmitting the traffic
(nxE1) and DCN channels (nx64 kbit/s).
3.6.2.1.2 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.
3.6.2.1.3 SPI
This block interfaces the SPI bus and handles equipment status. Failure is
indicated by LED’s on the front of the unit.
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12/221 02-CSH 109 32/1-V1 Uen A 2008-03-14
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