Ericsson MINI-LINK TN R3 ETSI Technical Description page 16

MINI-LINK TN R3 ETSI
3.1.2 PCI Bus
The Peripheral Component Interconnect (PCI) bus is a high bandwidth
multiplexed address/data bus used for control and supervision. Its main use is
for communication between the NPU software and other plug-in units' software
and functional blocks
3.1.3 SPI Bus
The Serial Peripheral Interface (SPI) is a low speed synchronous serial
interface bus used for:
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3.1.4 Power Bus
The external power supply is connected to a PFU (or NPU2/NPU3 B for AMM
2p/AMM 2p B). The internal power supply is distributed via the Power bus to
the other plug-in units. When using two PFUs in an AMM, the bus is redundant.
3.1.5 BPI Bus
The Board Pair Interconnect (BPI) bus is used for communication between two
plug-in units in a protected (1+1) configuration, for example when using two
LTU 155 units in a Multiplexer Section Protection (MSP)1+1 configuration.
It also interconnects groups of four plug-in units, enabling board protection
schemes including three and four plug-in units.
3.1.6 PTP Connection
The Point-to-Point (PTP) connection joins services to services (for example
Ethernet over VCs dropped by ADM) and services to line interfaces (for example
Ethernet over modem or ATM over SDH modem), see Figure 8 on page 11.
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Unit status control and LED indication
Board Removal (BR) button used for unit replacement
Inventory data
Temperature and power supervision
User I/O communication
Reset of control and traffic logic
4/1555-CSH 109 32/1-V1 Uen B 2007-09-14