User Manual

Chapter 2 - Installation Installing the Base Transceiver Station (BTS) Equipment
4Motion 76 System Manual
2.3.4 HOT SWAP Support
The NPU, AU, and PIU modules includes a blue HOT SWAP LED and a
micro-switch in the injector/ejector handle to support hot-swap control. After
releasing the ejector's button, the HOT SWAP LED should turn on, indicating that
power to/from the back-panel is disconnected and the module can be removed
safely.
2.3.5 Power Interface Unit (PIU)
The single Euro PIU module serves as the interface between the BTS site's DC
power source and the BTS Chassis Power Supply Units and external ODUs, which
receive power via the IDUs.
The PIU filters and stabilizes the BTS input power and protects the system from
power problems such as over voltage, surge pulses, reverse polarity connection
and short circuits. It also filters high frequency interference (radiated emissions)
and low frequency interference (conducted emissions) to the external power
source. Each BTS chassis contains two slots for an optional 1+1 PIU redundancy.
One PIU is sufficient to support a fully populated chassis. Two PIU modules
provide redundant power feeding (two input sources) while avoiding current flow
between the two input sources.
6 AUs, each AU connected to four 1x1 ODUs 2
6 AUs, each AU connected to two 2x1 2.5 GHz ODUs 1
Table 2-8: Power Feeder Requirements
Configuration Number of Power Feeders