Nera WILINK I User guide

System Manual
WILINK I Modular Base Station
SW Version 2.0February 2006P/N 214360

Document Control
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Document Control
No. Topic Description Version/Date Issued
1 General Base Station, Micro Base Station and
CPE have been divided to separate
manuals
SW Version 2.0,
January 2006
2 New Radio Bands
Sections 1.1, 1.5.1
New ODUs that support 3.3g, 3.6a
and 3.6b frequency bands
SW Version 2.0,
January 2006
3 Monitor/Telnet access
Sections 4.2.1, 4.5.2.1
3 access levels: Administrator,
Installer, Monitor
SW Version 2.0,
January 2006
4 Per Trap Configuration
Section4.4.3.4
Per trap configuration of Admin
Status, Severity and Suppression
Interval
SW Version 2.0,
January 2006
5 Multi Channels
Sections 4.4, 4.6, 4.7, 4.8
Support of Multi-Channels AU. Radio
Cluster, ODU, AU and Channel
entities, including new and modified
parameters.
SW Version 2.0,
January 2006
6 Frequency Bands File
Section 4.7.5
Separating availability of radio bands
(new HW) from SW releases.
SW Version 2.0,
January 2006
7 Cumulative Power On
Time
Sections 4.5.1, 4.8.4.1
Display of the cumulative power on
time for NPU and AU modules.
SW Version 2.0,
January 2006
8 Additional Back-Up Files
Section 4.5.2.5
Create/download Back Up Files for
Filtering parameters (including MAC
Address Deny List) and for Trap
Configuration.
SW Version 2.0,
January 2006
9 Performance Monitoring
Sections 4.5.4, 4.8.5,
4.9.6.4, 4.10.4.3.2
Improved counters for NPU, AU, SU
and Service
SW Version 2.0,
January 2006
10 SU Service Fault Status
Section 4.9.1
Indication of reason for service
denial: Loop problem or SU Duplicate
Name
SW Version 2.0,
January 2005
11 Configurable SU Name
Section 4.9.6.3.1.1
To enable a solution to situations with
Duplicate SU Names
SW Version 2.0,
January 2006
12 SU Estimated Distance
Section 4.9.1
Displaying for each SU its estimated
distance from the Base Station
SW Version 2.0,
January 2006

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No. Topic Description Version/Date Issued
13 MAC Addresses Behind
SU
Section 4.9.6.5
Displaying the list of MAC Addresses
(and VLAN IDs if applicable) of
devices behind SU
SW Version 2.0,
January 2006
14 Filtering
Sections 4.10.2, 4.10.4.8,
4.10.4.9, 4.10.4.10
Controlling traffic by
forwarding/discarding packets
according to a set of rules. Support of
L2 and L3/L4 filters. Filtering is per
interface (from either network or
wireless side)
SW Version 2.0,
January 2006
15 MAC Address Deny List
Sections 4.10.2, 4.10.4.11
Controlling traffic by discarding
packets to/from specific MAC
Addresses
SW Version 2.0,
January 2006
16 Hybrid VLAN Mode
Sections 4.10.1.5,
4.10.4.3.1.6
Enabling classification of both tagged
and untagged frames
SW Version 2.0,
January 2006
17 VLAN Transparency
Mode
Sections 4.10.1.5,
4.10.4.4.3
Defining the method of transferring
packets to the operator’s upstream
network
SW Version 2.0,
January 2006
18 Multicast VLAN
Sections 4.10.1.5,
4.10.4.5.6
Modified functionality. The feature is
needed only to support multiple
VLANs behind SUs that use a SW
version below 2.0. In SW version 2.0
and higher the SU handles multiple
VLANs by properly duplicating
messages.
SW Version 2.0,
January 2006
19 DRAP TTL Retries
Section 4.5.3.5
Parameter added in formal release of
SW version 1.5, defining the
maximum time before “dropping” the
gateway.
SW Version 2.0,
January 2006
20 Bridge Aging Time (Micro
Base station)
Section 4.5.3.4
Option of No Aging Time (null entry)
added
SW Version 2.0,
January 2006

Radio Frequency Interference Statement
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Radio Frequency Interference Statement
The Subscriber Unit equipment has been tested and found to comply with the
limits for a class B digital device, pursuant to ETSI EN 301 489-1 rules. These
limits are designed to provide reasonable protection against harmful interference
when the equipment is operated in a residential environment notwithstanding
use in commercial, business and industrial environments. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and
used in accordance with the instruction manual, may cause harmful interference
to radio communications.
The Base Station equipment has been tested and found to comply with the limits
for a class A digital device, pursuant to ETSI EN 301 489-1 rules. These limits are
designed to provide reasonable protection against harmful interference when the
equipment is operated in commercial, business and industrial environments. This
equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will
be required to correct the interference at the user’s own expense.
R&TTE Compliance Statement
This equipment complies with the appropriate essential requirements of Article 3
of the R&TTE Directive 1999/5/EC.
Safety Considerations - General
For the following safety considerations, “Instrument” means the WILINK I units’
components and their cables.
Grounding
Base Station chassis and outdoor units are required to be bonded to protective
grounding using the bonding stud or screw provided with each unit.
Safety Considerations – DC Powered Equipment
CAUTION ATTENTION
Risk of electric shock and energy hazard.
Disconnecting one Power Interface Unit (PIU)
disconnects only one PIU module. To isolate the
Base Station completely, disconnect both PIUs.
Risque de décharge électrique et
d'electrocution.
La déconnection d'un seul module
d'alimentation (PIU) n'isole pas complètement la
Station de Base. Pour cela, il faut
impérativement débrancher les deux modules
d'alimentation (PIU).
Restricted Access Area: The DC powered equipment should only be installed in
a Restricted Access Area.

Lithium Battery
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Installation Codes: The equipment must be installed according to the latest
edition of the country national electrical codes. For North America, equipment
must be installed in accordance with the US National Electrical Code and the
Canadian Electrical Code.
Overcurrent Protection: A readily accessible Listed branch circuit overcurrent
protective device, rated 40A, must be incorporated in the building wiring.
CAUTION: This equipment is designed to permit connection between the earthed
conductor of the DC supply circuit and the grounding conductor at the
equipment. See installation instructions.
The equipment must be connected directly to the DC Supply System
grounding electrode conductor.
All equipment in the immediate vicinity must be grounded in the same way,
and not be grounded elsewhere.
The DC supply system is to be local, i.e. within the same premises as the
equipment.
There shall be no disconnect device between the grounded circuit conductor
of the DC source (return) and the point of connection of the grounding
electrode conductor.
Lithium Battery
The battery on the NPU card is not intended for replacement.
Caution
To avoid electrical shock, do not perform any servicing unless you are qualified to
do so.
Line Voltage
Before connecting this instrument to the power line, make sure that the voltage of
the power source matches the requirements of the instrument.
Radio
The instrument transmits radio energy during normal operation. To avoid
possible harmful exposure to this energy, do not stand or work for extended
periods of time in front of its antenna. The long-term characteristics or the
possible physiological effects of radio frequency electromagnetic fields have not
been yet fully investigated.

Outdoor Units and Antennas Installation and Grounding
WILINK I MODULAR BASE STATION SYSTEM MANUAL
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Outdoor Units and Antennas Installation and Grounding
Ensure that outdoor units, antennas and supporting structures are properly
installed to eliminate any physical hazard to either people or property. Make sure
that the installation of the outdoor unit, antenna and cables is performed in
accordance with all relevant national and local building and safety codes. Even
where grounding is not mandatory according to applicable regulation and
national codes, it is highly recommended to ensure that the outdoor unit and the
antenna mast (when using external antenna) are grounded and suitable lightning
protection devices are used so as to provide protection against voltage surges and
static charges. In any event, The Supplier is not liable for any injury, damage or
regulation violations associated with or caused by installation, grounding or
lightning protection.
Disposal of Electronic and Electrical Waste
Disposal of Electronic and Electrical Waste
Pursuant to the WEEE EU Directive electronic and electrical waste must not be disposed of with
unsorted waste. Please contact your local recycling authority for disposal of this product.

About This Manual
This manual describes the WILINK I Base Station equipment Release 2.0 and
details how to install, operate and manage the system components.
This manual is intended for technicians responsible for installing, setting and
operating the WILINK I Base Station equipment, and for system administrators
responsible for managing the system.
This manual contains the following chapters and appendices:
Chapter 1 – System description: Describes the WILINK I system and its
components.
Chapter 2 – Installation: Describes how to install the Base Station system
components.
Chapter 3 – Commissioning: Describes how to configure basic parameters
and validate units’ operation.
Chapter 4 – Operation and Administration: Describes how to use the
Monitor application for configuring parameters, checking system status and
monitoring performance.
Appendix A – Software Upgrade: Describes how to load new software files
using TFTP, and how to switch to a new software version in WILINK I units.
Appendix B – Defining Service Profiles for Generic VoIP Gateways:
Describes the principles of defining Service Profiles for 3rd party generic
(non-DRAP-based) VoIP devices.

Contents
Chapter 1 - System Description.............................................................. 1
1.1 Introducing WILINK I.............................................................................................................. 2
1.2 Base Station Equipment........................................................................................................ 5
1.3 Networking Equipment .......................................................................................................... 9
1.4 Management Systems ........................................................................................................... 9
1.5 Specifications ...................................................................................................................... 12
Chapter 2 - Installation Guidelines....................................................... 23
2.1 Installing the AU-ODU.......................................................................................................... 24
2.2 Installing the Base Station Equipment................................................................................ 31
Chapter 3 - Commissioning .................................................................. 49
3.1 Configuring Basic Parameters of Base Station.................................................................. 50
3.2 Operation Verification.......................................................................................................... 52
Chapter 4 - Operation and Administration............................................ 57
4.1 WILINK I System Management ............................................................................................ 58
4.2 The Monitor Program........................................................................................................... 59
4.3 The NPU’s Main Menu.......................................................................................................... 62
4.4 Base Station Menu............................................................................................................... 64
4.5 NPU Menu............................................................................................................................. 71
4.6 Radio Cluster Menu ............................................................................................................. 86
4.7 ODU Menu ............................................................................................................................ 89

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4.8 AU Menu ...............................................................................................................................94
4.9 SU Menu..............................................................................................................................110
4.10 Services Menu ....................................................................................................................127
4.11 NPU Parameters Summary ................................................................................................166
Appendix A - Software Upgrade ..........................................................181
A.1 Before you Start .................................................................................................................182
A.2 File Loading Procedure......................................................................................................183
A.3 Completing the Software Upgrade (Switching Versions) .................................................184
Appendix B - Defining Service Profiles for Generic VoIP Gateways ...185
B.1 Introduction ........................................................................................................................186
B.2 1 POTS Basic VoIP G.729 Service Profile..........................................................................188
B.3 1 POTS Advanced VoIP G.729 Service Profile ..................................................................190
B.4 1 POTS Basic VoIP G.711 Service Profile..........................................................................192
B.5 1 POTS Advanced VoIP G.711 Service Profile ..................................................................194
Glossary ..............................................................................................197
Index ...................................................................................................209

Figures
Figure 1-1: WILINK I System Architecture ................................................................................................ 4
Figure 2-1: ODU Pole Installation Using Special Clamps........................................................................ 27
Figure 2-2: ODU Pole Installation Using Metal Bands............................................................................. 28
Figure 2-3: Bottom Panel of the AU-ODU............................................................................................... 29
Figure 2-4: WILINK I-BST-SH Chassis Slot Assignments ....................................................................... 32
Figure 2-5: PIU Module Front Panel....................................................................................................... 34
Figure 2-6: PSU Module Front Panel ..................................................................................................... 37
Figure 2-7: AU-IDU Module Front Panel................................................................................................. 38
Figure 2-8: NPU Module Front Panel ..................................................................................................... 40
Figure 2-9: AVU Drawer Front Panel...................................................................................................... 46
Figure 4-1: NPU Monitor’s Main Menu ................................................................................................... 62
Figure 4-2: Base Station Chassis Slot Assignments ............................................................................... 65
Figure 4-3: Uplink and Downlink Scheduled Transmissions.................................................................. 125
Figure 4-4: Filtering Functionality ......................................................................................................... 134

Tables
Table 1-1: 3.3 GHz Frequency Bands ...................................................................................................... 3
Table 1-2: 3.5 GHz Frequency Bands ...................................................................................................... 3
Table 1-3: 3.6 GHz Frequency Bands ...................................................................................................... 3
Table 1-4: PSU Requirements, Configurations with one NPU (excluding PSU redundancy)..................... 8
Table 1-5: PSU Requirements, Configurations with two NPUs (excluding PSU redundancy) ................... 8
Table 1-6: Radio Specifications.............................................................................................................. 12
Table 1-7: Base Station Antennas, Electrical Specifications ................................................................... 14
Table 1-8: AU-IDU to AU-ODU Communication ..................................................................................... 15
Table 1-9: Data Communication (Ethernet Ports) ................................................................................... 15
Table 1-10: Configuration and Management .......................................................................................... 16
Table 1-11: Standards Compliance, General.......................................................................................... 16
Table 1-12: Environmental Specifications............................................................................................... 17
Table 1-13: Services.............................................................................................................................. 18
Table 1-14: Mechanical Specifications, Base Station Equipment ............................................................ 19
Table 1-15: Electrical Specifications, Base Station Equipment ............................................................... 19
Table 1-16: Connectors, Base Station Equipment .................................................................................. 20
Table 1-17: Base Station Antennas, Mechanical Specifications.............................................................. 21
Table 2-1: AU-ODU Types..................................................................................................................... 24
Table 2-2: IF Cables Requirements........................................................................................................ 26
Table 2-3: Maximum IF Cable Length (Double Shielded Cables)............................................................ 26
Table 2-4: AU-ODU LEDs...................................................................................................................... 29
Table 2-5: AU-ODU Connectors............................................................................................................. 29
Table 2-6: Power Requirements, Base Station Equipment ..................................................................... 33
Table 2-7: PIU LEDs.............................................................................................................................. 35

Tables
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Table 2-8: PSU Requirements, Configurations with one NPU (excluding PSU redundancy) ...................36
Table 2-9: PSU Requirements, Configurations with two NPUs (excluding PSU redundancy)..................36
Table 2-10: PSU LEDs...........................................................................................................................37
Table 2-11: AU-IDU LEDs ......................................................................................................................39
Table 2-12: NPU Connectors..................................................................................................................41
Table 2-13: NPU LEDs...........................................................................................................................42
Table 2-14: AVU LEDs...........................................................................................................................46
Table 3-1: Basic NPU Parameters..........................................................................................................50
Table 3-2: AU-ODU LEDs ......................................................................................................................52
Table 3-3: AU-IDU LEDs ........................................................................................................................53
Table 3-4: NPU LEDs.............................................................................................................................54
Table 3-5: PIU LEDs ..............................................................................................................................55
Table 3-6: PSU LEDs.............................................................................................................................55
Table 3-7: AVU LEDs.............................................................................................................................56
Table 4-1: COM Port Configuration ........................................................................................................59
Table 4-2: Default Passwords.................................................................................................................74
Table 4-3: Frequency Bands ..................................................................................................................92
Table 4-4: Automatic Association of Channel 1 Upon First Power-Up ...................................................103
Table 4-5: Rates (Modulation Schemes and Coding) ............................................................................105
Table 4-6: Hybrid VLAN Mode..............................................................................................................132
Table 4-7: Hybrid VLAN Mode..............................................................................................................138
Table 4-8: Priority Marking Values........................................................................................................145
Table 4-9: CT Values ...........................................................................................................................151
Table 4-10: Pre-Configured Data Service Profiles.................................................................................160
Table 4-11: Pre-Configured Forwarding Rules for Data Service ............................................................161
Table 4-12: Pre-Configured Priority Classifiers for Data Services..........................................................162
Table 4-13: Pre-Configured QoS Profiles for Data Services..................................................................162
Table 4-14: Pre-Configured Voice Service Profiles (for DRAP-based Gateways) ..................................163
Table 4-15: Pre-Configured Service Profiles for Generic (non-DRAP) VoIP Services ............................163

Tables
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Table 4-16: Pre-Configured Forwarding Rule for Voice Services .......................................................... 164
Table 4-17: Pre-Configured Priority Classifiers for Generic (non-DRAP) VoIP Services ........................ 164
Table 4-18: Pre-Configured BE and RT QoS Profile for Voice Services................................................ 165
Table 4-19: Pre-Configured CG QoS Profile for Generic (non-DRAP) VoIP Services............................ 165
Table 4-20: Pre-Configured Forwarding Rule for Transparent Services ................................................ 165
Table 4-21: Pre-Configured QoS Profile for Transparent Services........................................................ 165
Table 4-22: NPU Monitor Parameters Summary................................................................................... 166

1
1
Chapter 1 - System Description
In This Chapter:
Introducing WILINK I, page 2
Base Station Equipment, page 5
Networking Equipment, page 9
Management Systems, page 9
Specifications, page 12

Chapter 1 - System Description
WILINK I MODULAR BASE STATION SYSTEM MANUAL
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1.1 Introducing WILINK I
WILINK I is a WiMAX platform for the 3 – 4 GHz licensed frequency bands. It
leverages the market-leading knowledge of Broadband Wireless Access (BWA),
industry leadership, proven field experience, and core technologies including
many years of experience with OFDM technology.
Built from the ground up based on the IEEE 802.16/ETSI HIPERMAN standards,
WILINK I is designed specifically to meet the unique requirements of the wireless
Metropolitan Area Network (MAN) environment and to deliver broadband access
services to a wide range of customers, including residential, SOHO, SME and
multi-tenant customers. Its Media Access Control (MAC) protocol was designed
for point-to-multipoint broadband wireless access applications, providing a very
efficient use of the wireless spectrum and supporting difficult user environments.
The access and bandwidth allocation mechanisms accommodate hundreds of
subscriber units per channel, with subscriber units that may support different
services to multiple end users.
The system uses OFDM radio technology, which is robust in adverse channel
conditions and enables operation in non line of sight links. This allows easy
installation and improves coverage, while maintaining a high level of spectral
efficiency. Modulation and coding can be adapted per burst, ever striving to
achieve a balance between robustness and efficiency in accordance with
prevailing link conditions.
WILINK I supports a wide range of network services, including Internet access
(via IP or PPPoE tunneling), VPNs and Voice over IP. Service recognition and
multiple classifiers that can be used for generating various service profiles enable
operators to offer differentiated SLAs with committed QoS for each service profile.
WILINK I products are currently available in the 3.3 GHz, 3.5 GHz and 3.6 GHz
frequency bands, as shown in the following tables. The actual operating
frequencies used by the system can be configured according to applicable radio
regulations, license conditions and specific deployment considerations.

Introducing WILINK I
WILINK I MODULAR BASE STATION SYSTEM MANUAL
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Table 1-1: 3.3 GHz Frequency Bands
Series (band) Duplex Separation Uplink Frequency Downlink Frequency
3.3e 50 MHz - MHz - MHz
3.3f 50 MHz - MHz - MHz
3.3g -76 MHz 3300-3324 MHz 3376-3400 MHz
* The 3.3 GHz CPE supports the full range of the 3.3e and 3.3f bands. The
3.3 GHz g CPE supports the 3.3g band. The Base Station’s radio (ODU) supports
a single band: 3.3e, 3.3f or 3.3g.
Table 1-2: GHz Frequency Bands
Series (band) Duplex Separation Uplink Frequency Downlink Frequency
3.5a -100 MHz 3399.5 to 3453.5 MHz 3499.5 to 3553.5 MHz
3.5b -100 MHz 3450 to 3500 MHz 3550 to 3600 MHz
* The 3.5 GHz CPE supports the full range. The Base Station’s radio (ODU)
supports either band 3.5a or band 3.5b.
Table 1-3: .6 GHz Frequency Bands
Series (band) Duplex Separation Uplink Frequency Downlink Frequency
3.6a -100 MHz 3600 to 3653.5 MHz 3700 to 3753.5 MHz
3.6b -100 MHz 3646.5 to 3700 MHz 3746.5 to 3800 MHz
* The 3.6 GHz CPE supports the full range. The Base Station’s radio (ODU)
supports either band 3.6a or band 3.6b.
A WILINK I system comprises the following:
Customer Premise Equipment (CPE): WILINK I Subscriber Units and
Voice/Networking Gateways.
Base Station (BST) Equipment: WILINK I Base Station equipment, including
the modular Base Station and its components and the stand-alone Micro Base
Station.
Networking Equipment: Standard switches/routers and other networking
equipment, supporting connections to the backbone and/or Internet.

Chapter 1 - System Description
WILINK I MODULAR BASE STATION SYSTEM MANUAL
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Management Systems: SNMP-based Management, Billing and Customer
Care, and other Operation Support Systems.
Figure 1-1: WILINK I System Architecture

Base Station Equipment
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1.2 Base Station Equipment
The Multi Carrier, High Power, Full Duplex Base Station provides all the
functionality necessary to communicate with SUs and to connect to the backbone
of the Service Provider.
The Base Station comprises the following elements:
1.2.1 Base Station Chassis
The Base Station equipment is based
on an 8U high cPCI (compact
Peripheral Component Interconnect)
shelf designed for installation in a
19” or 21” (ETSI) rack. This chassis
has a total of nine double Euro (6U
high) slots and six single Euro (3U
high) slots. All the modules are hot
swappable, and high availability can
be provided through multiple
redundancy schemes.
The six single Euro slots are intended for one or two redundant Power Interface
Units (PIU) and up to four redundant Power Supply Units (PSUs).
One of the double Euro slots is dedicated to the Network Processing Unit (NPU)
module, supporting a central networking and management architecture. Another
double Euro slot is reserved for an optional redundant NPU (NPU redundancy
support is planned for a future release).
The remaining seven double Euro slots are dedicated mainly for Access Unit (AU)
indoor modules, thus enabling various future redundancy configurations.
Additionally, the Base Station chassis contains an air convection and ventilation
fan tray (AVU).
1.2.2 Network Processing Unit (NPU)
The Network Processing Unit is the “heart” of the WILINK I Base Station. The NPU
module serves as the central processing unit that manages the base station’s
components and the SUs served by it. It also aggregates the traffic from the AU
modules and transfers it to the IP Backbone through a dedicated Gigabit/Fast
Ethernet interface. The NPU main functions are:

Chapter 1 - System Description
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Aggregate backbone Ethernet connectivity via a 100/1000 Base-T network
interface.
Traffic classification and connection establishment
initiation.
Policy based data switching.
Service Level Agreements management.
Centralized agent in the Base Station to manage all cell
site’s AUs and all registered SUs.
Base Station overall operation control, including AU diagnostic and control,
PSU monitoring, AVU management and redundancy support.
Alarms management, including external alarm inputs and activation of
external devices (future option).
Synchronization, including GPS antenna interface (future option), clock and
IF reference generation and distribution to the Base Station modules as well
as to other collocated Base Station chassis.
An SNMP agent incorporated into the NPU enables extensive In Band (IB)
management of the Base Station and all its registered SUs. Out Of Band (OOB)
management is supported through a dedicated 10/100 Base-T interface. A serial
RS-232 port supports local configuration, monitoring and debugging.
Two NPU modules can be used to provide a 1+1 redundancy scheme. The
redundancy mechanism, to be supported in future releases, will be based on a
Master <-> Slave principle, where the slave is in passive mode and is constantly
updating all the learning tables and networking parameters of the master card.
1.2.3 Access Unit (AU-IDU)
The double Euro AU-IDU module contains the wireless
IEEE 802.16-2004 based MAC and modem and is responsible
for the wireless network connection establishment and for
bandwidth management. Each AU-IDU connects to the NPU via
the back plane. In addition, each AU-IDU connects to all other
AU/NIU slots via the back plane over a shared bus for future
support of TDM traffic connectivity.
Each AU-IDU includes two 3.5/1.75 MHz PHY channels that
can connect to one or two ODUs. The AU-IDU module connects
to the AU-ODUs via Intermediate Frequency (IF) cables carrying

Base Station Equipment
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full duplex data, control and management signals between the AU-IDU and the
AU-ODU, as well as power (48 VDC) and 64 MHz synchronization reference clock
from the AU-IDU to the AU-ODU. The IF Tx and Rx frequencies are 240 MHz and
140 MHz, respectively. IDU-ODU service channel at 14 MHz serves for
bi-directional control, status and management signaling.
1.2.4 AU-ODU
The AU-ODU is a high power, full duplex multi-carrier radio
unit that connects to an external antenna. It is designed to
provide high system gain and interference robustness
utilizing high transmit power and low noise figure. It
supports a bandwidth of up to 14 MHz, enabling future
options such as increased capacity through larger channels
(e.g. 7/14 MHz) or using an IF multiplexer.
1.2.5 Power Interface Unit (PIU)
The single Euro PIU module is the interface between the Base Station site’s DC
power source and the Base Station chassis PSUs and external AU-ODUs, which
receive power via the AU-IDUs.
The PIU filters and stabilizes the Base Station 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 Base Station 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.
1.2.6 Power Supply Unit (PSU)
The single Euro PSU module is a 48 VDC power supply unit. Each
Base Station chassis can contain up to four PSU modules providing
N+1 redundancy configurations.
Table 1-4 displays the number of PSU modules (excluding
redundant units) required for various Base Station configurations
without NPU redundancy (one NPU):