Tait International Limited
P.O. Box 1645
Christchurch
New Zealand
For the address and telephone number of regional
offices, refer to our website: www.taitradio.com
Copyright and Trademarks
All information contained in this document is the
property of Tait International Limited. All rights
reserved. This document may not, in whole or in part,
be copied, photocopied, reproduced, translated, stored,
or reduced to any electronic medium or machinereadable form, without prior written permission from
Tait International Limited.
The word TAIT and the TAIT logo are trademarks of
Tait International Limited.
All trade names referenced are the service mark,
trademark or registered trademark of the respective
manufacturers.
Disclaimer
There are no warranties extended or granted by this
document. Tait International Limited accepts no
responsibility for damage arising from use of the
information contained in the document or of the
equipment and software it describes. It is the
responsibility of the user to ensure that use of such
information, equipment and software complies with the
laws, rules and regulations of the applicable
jurisdictions.
Enquiries and Comments
If you have any enquiries regarding this document, or
any comments, suggestions and notifications of errors,
please contact your regional Tait office.
US640974, US640977, US698339, US 702666,
US7758996, US8902804, US9107231, US9504034,
US9559967.
The AMBE+2™ voice coding Technology embodied
in this product is protected by intellectual property
rights including patent rights, copyrights and trade
secrets of Digital Voice Systems, Inc. This voice
coding Technology is licensed solely for use within this
Communications Equipment. The user of this
Technology is explicitly prohibited from attempting to
decompile, reverse engineer, or disassemble the Object
Code, or in any other way convert the Object Code into
a human-readable form.
Environmental Responsibilities
Tait International Limited is an environmentally
responsible company which supports waste
minimization, material recovery and restrictions in the
use of hazardous materials.
The European Union’s Waste Electrical and Electronic
Equipment (WEEE) Directive requires that this
product be disposed of separately from the general
waste stream when its service life is over. For more
information about how to dispose of your unwanted
Tait product, visit the Tait WEEE website at
www.taitradio.com/weee. Please be environmentally
responsible and dispose through the original supplier,
or contact Tait International Limited.
Tait International Limited also complies with the
Restriction of the Use of Certain Hazardous Substances
in Electrical and Electronic Equipment (RoHS)
Directive in the European Union.
In China, we comply with the Measures for
Administration of the Pollution Control of Electronic
Information Products. We will comply with
environmental requirements in other markets as they
are introduced.
Updates of Manual and Equipment
In the interests of improving the performance,
reliability or servicing of the equipment, Tait
International Limited reserves the right to update the
equipment or this document or both without
prior notice.
Intellectual Property Rights
This product may be protected by one or more patents
or designs of Tait International Limited together with
their international equivalents, pending patent or
design applications, and registered trade marks:
NZ409837, NZ409838, NZ415277, NZ415278,
NZ530819, NZ534475, NZ547713, NZ577009,
NZ579051, NZ579364, NZ586889, NZ610563,
NZ615954, NZ700387, NZ708662, NZ710766,
NZ711325 , NZ726313, NZ593887, AU2015215962,
AU339127, AU339391, AU2016259281,
AU2016902579, EU000915475-0001, EU 0009154750002, GB2532863, US 14/834609 Div. no 1, US15/
346518 Div.no 2, US15/350332, US15/387026 Div.,
US20150085799, US20160044572, US20160057051,
This manual provides information on installing and operating the TB9400
base station. It is intended for use by experienced technicians familiar with
installing and operating base station equipment. It also includes
configuration, maintenance and troubleshooting information.
Except where stated otherwise, the information in this manual generally
applies to both standard and receive-only base stations and reciters.
When “reciter” is referred to, this generally applies also to the receiver
(receive-only reciter). References to power amplifiers (PAs) and transmitting obviously do not apply to receive-only equipment.
Unless mentioned specifically, this manual will use the term “base station”
to refer to both base station and repeater.
Document Conventions
The TB9400 base station has a web interface with an accordion menu on
the left side of the screen. “Configure > Base Station > Channels” means
click Configure in the top-level menu, then in the expanded Configure
menu click Base Station, and finally click on the Channels tab on that page.
Within this manual, four types of alerts may be given to the reader. The
following paragraphs illustrate each type of alert and its associated symbol.
WarningThis alert is used when there is a hazardous situation
which, if not avoided, could result in death or serious injury.
CautionThis alert is used when there is a hazardous situation which,
if not avoided, could result in minor or moderate injury.
NoticeThis alert is used to highlight information that is required to
ensure procedures are performed correctly. Incorrectly performed procedures could result in equipment damage or malfunction.
This icon is used to draw your attention to information that may
improve your understanding of the equipment or procedure.
■ TaitNet P25 Trunked Networks with TB9400 Base Stations System
Manual (MBA-00064-xx)
■ TaitNet Analog Conventional Networks with TB9400 Base Stations
System Manual (MND-00001-xx)
■ Safety and Compliance Information (MBA-00012-xx)
The characters xx represent the issue number of the documentation.
Technical notes are published from time to time to describe applications for
Tait products, to provide technical details not included in manuals, and to
offer solutions for any problems that arise. Technical notes are available in
PDF format from the Tait support website. For more information contact
your regional Tait office.
20November 2018General updates for the 2.55 release
Advice for configuring subaudible signaling.
19July 2018General updates for the 2.50 release
Addition of B2 band.
Clarified that HH band is nominally 378 - 420. All frequencies can be used
except for the range at 406 - 406.1 (exclusive).
Updated type designators.
Smaller updates throughout.
18March 2018General updates for the 2.45 release
Publication Record now shows most recent manual issue at top of table
Added note about fill-in receiver to “8.4 Replacing a Power Amplifier”
Clarified “Bands and Sub-Bands” table
Updated section 5.2.4 “Connecting a Networked PC to a Base Station”
Added site controller table to the “1.6. Licenses” section
HH band is now released as 50W and receive only
17November 2017General updates for the 2.40 release.
Added definition of “integral voter” to Glossary on page 122
Added solution to Internet Explorer black screen in Connecting Your PC to
the Base Station on page 82.
Added notice regarding fan operation to Front Panel Fans on page 31.
Added information on cancelling a firmware package to Subaudible
Signaling on page 99.
Updated information on downloading firmware packages Setting Up a
Central Package Server on page 97.
Added notice regarding the base station resetting to Setting the IP Address
on page 84.
Added new HH band information throughout.
16July 2017General updates for version 2.35 release.
General minor wording and content changes throughout
Added P25 Conventional Simulcast Repeater to Features on page 10
Central voter and satellite licences listed as alternatives Licenses on
page 19.
Updated description for the ‘Digital Fixed Station’ Interface in Licenses on
page 19.
Updated the “Licenses and applicability” table for Central Voter, IP
Networking Satellite, and Simulcast.
Added new H3 band information throughout.
Screenshots have been updated in various places.
The Tait TB9400 base station is a robust state-of-the-art digital fixed
station that combines Tait’s proven strengths in reliability, high
performance and modular design with software-based configurability and
operation, digital signal processing, and voice-over-IP technology.
The TB9400 operates as a transceiver in Project 25 trunked, trunked
simulcast, and P25 conventional networks. It is capable of either P25 Phase
1 FDMA operation, or 6.25kHz equivalent P25 Phase 2 TDMA operation.
The TB9400 can also operate in an analog conventional simulcast or
non-simulcast multi-site network.
The TB9400 combines industry-leading digital voice quality with rugged
design specifications and intuitive user interfaces. These products are
designed to meet the needs of the public safety and public service sectors.
The ability of the base station to link stations using standard Internet
Protocol communications, and to add features through software options
ensures that P25 systems designed with the TB9400 are scalable in both
size and functionality.
Its Ethernet interface provides built-in network connectivity, allowing the
TB9400 to join with other TB9400 base stations to form a channel group.
This network supports voice-over-IP and remote management of all base
stations via a web browser.
The following are some of the features of the base station:
■ Fully compliant with the P25 Common Air Interface. Can therefore
■ Supports P25 Phase 1 operation with either C4FM or LSM modulation
■ Supports P25 Phase 2 operation.
■ Analog conventional repeater operation.
■ Analog conventional simulcast operation on an IP backbone requiring
■ Integrated built-in voting facility. No external voter is needed.
■ Can be completely managed remotely from a PC running a web
■ An integrated wiring solution is provided for the system control bus and
■ Reciters (receiver/exciter modules) can be replaced without affecting
■ Rugged construction with generous heatsinks and fan-forced cooling
interoperate with any similarly compliant radios.
on the transmitter
no audio calibration or training.
browser: configuration, alarm monitoring, fault diagnosis, feature and
firmware upgrades. Alarms can also be reported via SNMP traps,
allowing integration with an SNMP-based network management
system.
DC power connections to each module in the subrack.
the operation of other reciters in the same subrack.
for continuous operation from –22°F to +140°F (–30°C to +60°C).
10DescriptionTB9400 Installation and Operation Manual
The base station consists of a subrack with up to two transmit/receive
channels, or up to four receive-only channels.
The single PMU (power management unit) supplies and manages power to
the whole subrack (refer to “Theory of Operation” on page 22). One reciter
and one PA (power amplifier) are needed for each transmit/receive channel.
The PA is not required for a receive-only base station. There is also a front
panel with user controls and fans. The modules are interconnected at the
front of the subrack. External connections to the modules are located at the
rear.
Modules come in different variants depending, for example, on the RF
band or the supply voltage.
Each module is inserted into the 4U subrack from the front and is secured
at the front with a metal clamp. Both clamp and module are easily removed
for rapid module replacement. The modules are secured laterally with
plastic guides that clip into the top and bottom of the subrack. These guides
can be easily repositioned to change the configuration of a subrack. The
heavier modules are also secured laterally by metal tabs at the rear of the
subrack.
The following provides a brief description of the available modules.
SubrackThe 4U subrack is made of passivated steel and is designed to fit into a
standard 19 inch rack or cabinet. The subrack is fitted with an interconnect
board that connects the system control bus and power to the modules and
front panel. The position of a module in the subrack is defined by the socket
on the subrack interconnect board to which the module is connected by the
system control bus.
The front panel is mounted onto the subrack with two quick-release
fasteners. It incorporates the indicator LEDs, four-line LCD display, user
controls, ambient temperature sensor and cooling fans.
The indicator LEDS allow some monitoring of the operational status of the
base station. The user controls and display allow the technician to
configure the IP address of each module. Refer to “Front Panel” on page 38
for more information.
The base stations have different front panel ducting arrangements
depending on PA type and power. Front panels may not be interchangeable.
The microphone input and speaker are not used in this release of the
TB9400.
ReciterThe reciter module comprises the receiver, exciter and digital control
circuitry. The reciter provides the Ethernet interface and system inputs and
outputs.
Receiver modules (receive-only reciters) are not fitted with the transmit
circuitry or front panel SMA connectors, and are physically unable to
transmit.
reciterreceiver
12DescriptionTB9400 Installation and Operation Manual
The PA amplifies the RF output from the reciter and is available in 50W
and 100W models.
The 50W model mounts vertically in the subrack, while the 100W model
mounts horizontally as it has a wider heatsink. The 100W PA is also fitted
with an airflow duct.
50W PA100W PA
Both models are designed to operate on the 28VDC output provided by the
PMU. PAs are not required in a receive-only base station.
Power Management
Unit
The PMU provides the 28VDC
power supply for the modules in the
subrack. It can operate on
120/230VAC 50/60Hz nominal, and
12, 24 or 48VDC nominal. The input
voltage can be AC, DC, or both AC
and DC, depending on the model. The
PMU also has an auxiliary DC output
of 13.65VDC, 27.3VDC, or
This section illustrates the main mechanical components of the base
station.
Figure 1.1 below shows the configuration for a typical dual 50W base
station. The subrack has six slots, numbered from right to left as viewed
from the front of the subrack. The PMU occupies slots 5 and 6, with the
reciter and PA pairs to the right of it in slots 1 to 4. Each PA is mounted
vertically with its heatsink facing its associated reciter. The PMU and each
reciter/PA pair have their own cooling fans.
The front panel can be easily removed from the subrack by undoing two
quick-release fasteners. Refer to “Replacing Modules” on page 105 for
more details.
Figure 1.1Mechanical assembly - dual 50W base station with front panel
b
c
.
g
d
e
f
1@
1!
1#
front panel
b
subrack
c
PMU
d
PA 2
e
reciter 2
f
cable retaining clip
g
PA 1
h
reciter 1
i
module retaining clamp
j
subrack interconnect board
1)
plastic guide rail
1!
subrack interconnect board retaining clamp
1@
front panel fastener
1#
h
i
j
1)
14DescriptionTB9400 Installation and Operation Manual
Figure 1.2 below shows the configuration for a typical single 50W base
station. The PMU again occupies slots 5 and 6, with the reciter in slot 1 and
PA in slot 2. The PA is mounted vertically with its heatsink facing the
reciter. The PMU and the reciter/PA pair have their own cooling fans.
Figure 1.2Mechanical assembly - single 50W base station
Figure 1.3 below shows the configuration for a typical 100 W base station.
The PMU occupies slots 5 and 6, with the PA directly beside it in slots 3
and 4. The reciter occupies slot 1. Unlike the 50W PAs, the 100W PA is
mounted horizontally with the heatsink facing upwards. It is also fitted with
an airflow duct to channel the airflow from the cooling fan through the
heatsink fins.
Figure 1.3Mechanical assembly - single 100W base station
g
f
PMU
b
PA
c
airflow duct
d
b
c
d
e
reciter
e
subrack
f
cable retaining clip
g
16DescriptionTB9400 Installation and Operation Manual
Much of the circuitry in the base station is common to all frequency bands,
and is therefore covered by a single description in this manual. In some
cases the descriptions refer to specific bands or sub-bands, and these are
identified with the letters listed in the following table.
Frequency
IdentificationFrequency Band and Sub-band50W100WReceive-only
B bandB2 = 136MHz to 156MHz
B3 = 148MHz to 174MHz
H bandHH = 378MHz to 420MHz
H1 = 400MHz to 440 MHz
H2 = 440MHz to 480 MHz
H3 = 470MHz to 520 MHz
K bandK4 = 762 MHz to 870MHz
a. The actual frequency coverage in this band is:
Transmit: 762MHz to 776 MHz, and 850 MHz to 870 MHz
Receive: 794MHz to 824MHz
In Brazil, for K band, the TB9400 is considered to be configured as a base
station with retransmission of received signals.
The TB9400 operates in P25 trunked networks (Phase 1 or Phase 2), P25
conventional networks and analog conventional networks. It operates as a
stand-alone repeater/base station, or as part of a channel group, providing
receiver voting and simulcast transmission. All air interfaces and system
types support simulcast operation.
In P25 Phase 2 operation, a single TB9400 base station can provide two
traffic channels, since each radio frequency (physical channel) provides
two logical channels (timeslots). However, it can provide only one control
channel, since control channels are still P25 Phase 1.
In a trunked simulcast network, the transmitters in the channel group are
synchronized and transmit simultaneously on the same frequency. Each
transmitter needs a highly accurate 1PPS pulse and an external frequency
reference, so that it can time transmissions with the required accuracy. Also
required is an NTP source that is derived from the same source as the 1PPS
signal. This will ensure a common timestamp in logs across all units in the
system. An external frequency reference, along with an NTP source and
1PPS signal derived from the same GPS source, are also essential for all
reciters for P25 Phase 2 operation.
In a P25 conventional network, the TB9400 operates as a single or wide
area conventional repeater, with receiver voting and optional simulcast.
Dispatch connection is via two distinct interfaces:
■ P25 standard DFSI connection (up to three connections simultaneously)
■ Tait P25 Console Gateway, supporting conversion between P25 and
analog consoles with MDC1200 signalling
In an analog conventional network it can operate as a repeater with
CTCSS
The base station can also operate as part of an analog conventional
simulcast network and is fully IP-connected. The base station also features
an internally integrated voter, and therefore requires no external voter.
The base station can be provided as a receive-only variant in systems that
need sites to enhance the receive coverage. The receiver module in a
receive-only base station is physically unable to transmit.
For more information on these applications, refer to the Help and
appropriate Tait System Manual.
1
or DCS subaudible signaling.
1. Private Line (PL).
18DescriptionTB9400 Installation and Operation Manual
Some operational functions of the base station are controlled by licenses.
These functions will not work unless you purchase the appropriate feature
license and enable the feature set controlled by that license. The feature sets
currently available are listed below.
Base stations can operate in distinct network tiers according to the feature
licences on the base station.
The compatibility rules are defined in the following table:
The central voter and satellite licences listed below are alternatives.
This is the licence that accompanies the base station. A base station with
this license can operate as a repeater in an analog conventional network.
Allows a base station to transmit and receive P25 Phase 1 C4FM digital
voice transmissions.
Allows a base station to become a trunking master, functioning as an
interface between the trunking site controller and the channel group.
Allows a base station (master or satellite) to have a TCCP connection
(control or status) to a trunking site controller.
Allows the base station to integrate with dispatch consoles supporting
DFSI (Digital Fixed Station Interface).
P25 and analog. This feature allows a base station to act as a central voter.
This feature is required in base stations that have transmitters and belong
to a P25 Phase 1 simulcast or analog simulcast network
in the central voter of a simulcast channel.
1. Not needed for receive-only base stations.
2
1
. It is also required
P25 Trunking
Failsoft
(TBAS063)
Linear Simulcast
Modulation
(TBAS065)
P25 Phase 2
Trunking
(TBAS066)
P25 Phase 2
Simulcast
(TBAS069)
Allows trunked channels that become isolated from a site controller to
perform simple conventional operation and to interface to a digital dispatch
system. If a trunked channel consists of several base stations in a channel
group, only the central voter (normally the master) needs this license. It is
then able to become the failsoft repeater for that channel group.
P25 only. Allows the base station to transmit using the LSM modulation
1
scheme
. This scheme allows increased site separation in simulcast
networks. Also requires the Simulcast license (TBAS062).
This feature allows the base station to operate in trunking mode using
two-slot TDMA as defined by the P25 Phase 2 standards.
This feature is required in base stations that have transmitters and belong
1
to a P25 Phase 2 simulcast network
of a P25 Phase 2 simulcast channel
. It is also required in the central voter
2
. Also requires the P25 Phase 2
Trunking (TBAS066) and Simulcast (TBAS062) licenses. Tait also
recommends adding the Linear Simulcast Modulation (TBAS065) license
as it provides improved RF performance.
P25 Access
Trunking Operation
(TBAS070)
IP Networking
Satellite
(TBAS071)
P25 Express6
Trunking Operation
(TBAS072)
Enables single site P25 trunking.
All system types and all air interface types. This feature allows a base
station to be part of a channel group without requiring the Central Voter
(TBAS061) license.
Enables P25 trunking with up to 6 sites.
2. The central voter in a simulcast channel needs the respective Phase 1 or
Phase 2 simulcast license. Normally, a transceiver member of a simulcast
channel will have a simulcast license, so this constraint should not be an
issue.
20DescriptionTB9400 Installation and Operation Manual
The reciter receives RF signals from its RF input and sends RF from its RF
output to the PA, along with a PA key signal. The PA sends an RF feedback
signal to the reciter for linearization and power control purposes. The
reciter also receives signals from, and sends signals to, the system
interface, the Ethernet interface, and the front panel (see Figure 1.4).
A system control bus interconnects the modules and carries alarm and
control signaling between the reciter and the other modules (refer to
“Intermodule Communications” on page 25 for more details).
The Ethernet interface carries voice over IP and also allows maintainer
access via a web browser.
Figure 1.4Base station high-level diagram
RF To
Antenna
AC Input
DC Input
A receive-only base station has a receiver instead of a reciter,
and does not have a PA.
PMU
28VDC
PA
System Control Bus
RF+PAKey
RF Feedback
RF From
Antenna
1PPS
Reciter
Front
Panel
External
Reference
Frequency
System Input
and Output
Ethernet Interface
to Network
22DescriptionTB9400 Installation and Operation Manual
The reciter carries out signal processing and has overall control of the base
station. Its circuit boards are shown in Figure 1.5.
Figure 1.5Reciter boards
RF Input
RF Output
RF Input
(feedback
from PA)
Receiver
Board
Transmit
Forward
Board
Transmit
Reverse
Board
Reciter
Control
Board
Front
Panel
System Input
and Output
Ethernet Interface
to Network
Maintainer Access
The receiver board contains all the receiver circuitry, while the exciter
circuitry is located on the transmit forward board.
The reciter control board converts information between analog and digital
and controls the maintainer’s access via the front panel. It performs the air
interface signal processing for digital P25 operation, gives the base station
an identity as a network element, and provides the physical connections for
the Ethernet and system interfaces.
Figure 1.6 gives an overview of signal paths within the reciter.
Figure 1.6Reciter signal paths
Receive
RF Interface
Demodulator
P25
Modem
ControlADCDDC
Transmit
RF Interface
Transmit
RF Interface
(feedback
from PA)
DAC
ADC
Cartesian
Loop
Modulator
FM
Baseband
Audio
G.711
Protocol
Stack
Reciter Control Board
RTP
UDP
IP
Ethernet
Interface
Digital P25 signals from the receive RF interface pass through the digital
receiver and P25 modem to the control software in the control processor.
The control software passes the signal through the Ethernet interface to the
site controller (P25 trunked networks), to the console gateway
(conventional networks), or for a satellite, to the central voter in a simulcast
system.
Input to the Ethernet interface can be from the site controller (P25 trunked
networks), from the console gateway (conventional networks), or from the
central voter in a simulcast system. These inputs are processed by the
control processor and passed through the P25 modem to the transmitter. If
the base station is itself a central voter, this input can also be a received
signal, which is voted on and sent back through the Ethernet interface to the
site controller.
1.7.2Online and Offline Modes
The base station normally operates in Online mode, but you can put it into
Offline mode via its web interface.
Online ModeIn Online mode, the base station is in service and performs its normal
functions of transmitting and receiving radio signals.
24DescriptionTB9400 Installation and Operation Manual
Offline mode allows a maintenance engineer to carry out tasks that can not
be done while the base station is in service - such as activating firmware or
running diagnostic tests.
1.7.3Intermodule Communications
A system control bus and a subrack interconnect board link the modules in
the subrack and carry alarm and control signaling between the reciter and
the other modules, as shown in Figure 1.7.
Specific configuration settings for dual base stations are described in
The PMU manages the supply of power to ensure uninterrupted operation
of the base station. A range of parameters is monitored and these can
trigger alarms that are sent to the reciter. Alarms can be monitored via the
web interface and reported via SNMP traps; they are also recorded in the
reciter’s internal log file.
AC to DC
Changeover
When the PMU has an AC and a DC module, the base station can be
powered by either the AC (mains) or the DC (battery) supply. The base
station will default to the AC supply if both supplies are provided. If the
AC supply becomes unavailable, a seamless changeover from the AC to
DC supply takes place, providing that the battery voltage is above the
configured minimum startup voltage. You can use a web browser to check
whether the base station is running on battery or mains power.
DC OperationWhen the base station is running off the DC supply and the battery voltage
falls below the configured minimum, the base station will enter battery
protection mode to protect the battery and base station equipment. The
standby power supply card maintains the power to the PMU
microprocessor, while the rest of the PMU is shut down. When the battery
voltage rises to the configured startup setting, power is resumed to the DC
supply. Refer to “PMU Operation on DC Input” on page 28 for more
detailed information.
Auxiliary Power
Control
DistributionFigure 1.8 shows how power is distributed to modules in the subrack. The
The output from the auxiliary power supply board can be used to power
other site equipment. The maximum output is 40W.
28VDC output from the PMU is fed directly to the PA in a single base
station, or directly to PA 1 in a dual base station, and to the other modules
via the subrack interconnect board. Power to the reciters and front panel is
current-limited by self-resetting fuses on the subrack board.
The AC converter has a series switch which breaks the phase input to the
converter. The DC input, however, has much higher current ratings. Its
switch does not disconnect power from the DC converter itself, but disables
the converter by switching off its control circuitry.
The outputs from both the AC and DC high power converters are added
together and fed to the modules via the high-current outputs. The auxiliary
output is also tapped off this summed output.
26DescriptionTB9400 Installation and Operation Manual
The operation of the PMU on DC input is controlled by three sets of
parameters:
■ user-programmable alarms
■ user-programmable startup and shutdown limits
■ battery protection limits
The voltage range for each of these parameters is provided in Table 1.2 on
page 29. Figure 1.9 on page 30 illustrates how these parameters interact,
and how they control the operation of the PMU over a range of DC input
voltages.
AlarmsUser-programmable alarms can be set for low or high battery voltage
(Configure > Alarms > Thresholds). The alarms will be triggered when the
set voltage levels are reached. These limits are subject to the tolerances of
the battery protection circuitry, as stated in “Battery Protection (Fail-safe)
Limits” in Table 1.2.
Startup and
Shutdown Limits
Battery Protection
Limits
The user-programmable startup and shutdown limits allow for adjustable
startup and shutdown voltages (Configure > Base Station >
Miscellaneous). These limits can be adjusted for different numbers of
battery cells, or for the particular requirements of the base station
operation. Once the limits are reached, the PMU will shut down. These
limits are subject to the tolerances of the battery protection circuitry, as
stated in “Battery Protection (Fail-safe) Limits” in Table 1.2.
NoticeIt is possible to set the startup voltage of the base station
below the nominal voltage of the battery. Continuing to use a battery for
extended periods when it is below its nominal voltage will severely
shorten its service life. For more information on battery management,
we recommend that you consult the battery manufacturer.
The battery protection limits are set in hardware at the factory, and cannot
be adjusted by the user. These limits will not be reached under normal
operation conditions, but are provided as “fail-safe” measures to protect the
battery from deep discharge. They also remove the need for low-voltage
disconnect modules.
28DescriptionTB9400 Installation and Operation Manual