User Manual
Chapter 4 - Operation and Administration Using the CLI NPU Configuration
4Motion 429 System Manual
4.3.14 Configuring the 4Motion Shelf
The 4Motion shelf comprises the following components:
NPU card: Serves as the shelf controller that manages and monitors all the
shelf components. In addition, it provides backbone Ethernet connectivity via
a 10/100/1000 Base-T network interface. The shelf contains one active and
one redundant NPU card.
AU: Is responsible for wireless network connection establishment and for
bandwidth management. The shelf contains six active and one redundant AU.
PSU: Accepts 48V DC input and provides 5, 3.3, +/-12V DC output. There are
four PSUs in the shelf and work in load-sharing mode.
PIU: Serves as a 48V power source for PSU. One active and one redundant PIU
are provided in the shelf.
GPS: An external GPS receiver is used to synchronizes the air link frames of
Intra-site and Inter-site located sectors to ensure that in all sectors the air
frame will start at the same time, and that all sectors will switch from transmit
(downlink) to receive (uplink) at the same time. In addition, the GPS
synchronizes frame numbers that are transmitted by the AU.
AVU: Includes a 1U high integral chamber for inlet airflow and a 1U high fan
tray with an internal alarm module. The AVU comprises 10 brush-less fans,
where 9 fans are sufficient for cooling a fully loaded chassis.
Power Feeder: The PIU can support a maximum current of 58 A (@-40.5 VDC).
In certain installations with a relatively high number of ODUs this current
may not be sufficient to power the shelf and all the ODUs. In such
installations the ODU Power Feeder is used as an additional power source
providing power (-48 VDC) to ODUs. It transfers transparently all signals
between the AU and the ODU, while injecting DC power received from an
external source. Each ODU Power Feeder unit can serve up to four ODUs.
This section describes the commands to be used for:
IMPORTANT
NPU redundancy is not supported in the current release.