User's Manual

Chapter 1 - System Description The Base Transceiver Station
4Motion 19 System Manual
 Context client/server
 ID to IP address resolution for ASN entities
 IP and Ethernet convergence sublayers
 Keep-alive signaling towards the relevant ASN-GWs for enhanced management
of service availability
The AU design is based on Alvarion's programmable, off-the-shelf, cutting-edge
components, in order to provide a future-proof solution with excellent cost and
performance.
The AU card interfaces with the NPU card for R6/R8 functionality, as well as
control, synchronization and management between the NPU and AU.
The AU implements four receive and transmit channels, each of them is HW-ready
for up to 20 MHz bandwidth.
1.3.1.4 PIU
The single-Euro Power Interface Unit module serves as the interface between the
DC power source and both the PSU modules and external ODU radio transceivers.
The PIU filters and stabilizes the input power, and protects the system from power
problems such as over-voltage, surge pulses, reverse polarity connection, and
short circuits. It filters high-frequency interference (radiated emissions) and
low-frequency interference (conducted emissions) at the external power source.
Each shelf contains two slots for optional 1+1 PIU redundancy. One PIU is
sufficient to support a fully populated shelf, and two modules provide redundant
power feeding (i.e. from two input sources), while avoiding current flow between
the two input sources.
1.3.1.5 PSU
The single-Euro Power Supply Unit module is a -48 VDC power supply unit that
generates low-voltage DC output to comply with PICMG 2.x standard
requirements. Each shelf can contain up to four PSU modules supporting N+1
redundancy configuration scheme.
Table 1-2 displays the number of PSU modules (excluding redundant units)
required for various Base Station configurations without NPU redundancy (one
NPU):