Nokia MetroSite BBU Product Description

8/9/2019 Nokia MetroSite BBU Product Description

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Nokia MetroSite BBU

User Manual, version 3

468955A_03_NOLSP

DN99177987 © Nokia Networks Oy 1 (42)Issue 2-0 en Nokia Proprietary and Confidential

Product Description



Product Description

2 (42) © Nokia Networks Oy DN99177987Nokia Proprietary and Confidential Issue 2-0 en

The information in this document is subject to change without notice and describes only theproduct defined in the introduction of this documentation. This document is intended for theuse of Nokia Networks' customers only for the purposes of the agreement under which thedocument is submitted, and no part of it may be reproduced or transmitted in any form ormeans without the prior written permission of Nokia Networks. The document has beenprepared to be used by professional and properly trained personnel, and the customerassumes full responsibility when using it. Nokia Networks welcomes customer comments aspart of the process of continuous development and improvement of the documentation.

The information or statements given in this document concerning the suitability, capacity, orperformance of the mentioned hardware or software products cannot be considered bindingbut shall be defined in the agreement made between Nokia Networks and the customer.However, Nokia Networks has made all reasonable efforts to ensure that the instructionscontained in the document are adequate and free of material errors and omissions. NokiaNetworks will, if necessary, explain issues which may not be covered by the document.

Nokia Networks' liability for any errors in the document is limited to the documentary correctionof errors. Nokia Networks WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS INTHIS DOCUMENT OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL(INCLUDING MONETARY LOSSES), that might arise from the use of this document or theinformation in it.

This document and the product it describes are considered protected by copyright according tothe applicable laws.

NOKIA logo is a registered trademark of Nokia Corporation.

Other product names mentioned in this document may be trademarks of their respectivecompanies, and they are mentioned for identification purposes only.

Copyright © Nokia Networks Oy 2000. All rights reserved.




Contents

Contents 3

List of tables 5

List of figures 6

1 About this document 7

2 Introduction 9

3 Features 133.1 System compatibility 133.2 Inherent site protection 13

3.3 Easy implementation 133.4 Installation 143.5 Battery type 143.6 Cost savings 14

4 Construction and units 154.1 System function 174.2 Unit descriptions 184.2.1 AC to DC charger unit (HALD01) 184.2.2 Inverter unit (LDHA01) 204.2.3 System Controller PCB 214.2.3.1 Connectivity 244.2.3.2 Signals 244.2.4 External fan unit 264.2.5 Internal fan unit 264.2.6 MetroSite BBU enclosure 274.2.6.1 Enclosure: unit section 294.2.6.2 Enclosure: battery section 314.2.7 Cover, cable cover and cable cover support 31

5 Alternatives 33

6 Technical specifications 356.1 Mechanical and environmental specifications 356.1.1 MetroSite BBU 35

6.1.2 Charger unit 356.1.3 Inverter unit 366.1.4 System controller PCB 366.2 Electrical specifications 376.2.1 MetroSite BBU 376.2.2 Charger unit 376.2.3 Inverter unit 386.2.4 System Controller PCB 396.3 Compliance qualifications 406.3.1 EMC qualification 40



Product Description


6.3.2 Electrical safety 416.3.3 Environmental 416.3.4 Noise levels 42




List of tables

Table 1. System Controller PCB signal inputs and outputs 25

Table 2. Stored alarms 26

Table 3. Output alarms 26

Table 4. MetroSite BBU mechanical and environmental specifications 35

Table 5. Mechanical and environmental specifications 36



Table 8. MetroSite BBU electrical specifications 37

Table 9. Battery electrical specifications 37Table 10. Charger electrical specifications 38

Table 11. Inverter electrical specifications 39

Table 12. Control PCB electrical specifications 39

Table 13. EMC qualification 40

Table 14. Electrical safety 41

Table 15. Environmental standards 42



Product Description


List of figures

Figure 1. A typical simplified block diagram of a micro-cellular configuration 10

Figure 2. Nokia MetroSite BBU configuration 11

Figure 3. Principal MetroSite BBU elements. 16

Figure 4. Simplified system block diagram 17

Figure 5. Charger unit block diagram 19

Figure 6. Charger unit physical structure 20

Figure 7. Inverter unit block diagram 21

Figure 8. System controller PCB simplified block diagram 22

Figure 9. System controller PCB layout (top view) 23Figure 10. MetroSite BBU enclosure and parts 28

Figure 11. Location of control panel and batteries 29

Figure 12. Control panel layout 30

Figure 13. Cover, cable cover and cable cover support configuration 32



About this document


1 About this documentThis document provides a detailed description of the Nokia MetroSite BatteryBack-up Unit (BBU).

The information details each of the hardware elements comprising a MetroSiteBBU, and how these elements integrate to realise a functional entity.

The information includes elemental functionality and electrical, mechanical andenvironmental operational standards which have been invoked when designingthe Nokia MetroSite BBU.



Product Description




Introduction


2 IntroductionThe Nokia MetroSite BBU is an integral part of the MetroSite system designed toprovide a comprehensive mobile phone coverage in towns and cities.

The function of the Nokia MetroSite BBU is to provide AC electrical back-upsupport for connected elements.

Nokia MetroSite BBU is able to support a maximum of two 1W MetroSite BTSs,a single 5W (HP) MetroSite BTS, or a single MetroHub. A simplified typicalblock diagram is given as an example in Figure 1.

The electrical units comprising the MetroSite BBU are housed in a compactenclosure mounted on a backplate. The assembly is protected by a plastic coverwhich interlocks with the backplate. A lock assembly completes the integrity of the Nokia MetroSite BBU.

The Nokia MetroSite BBU is suitable for wall or pole mounting and because of its size, aesthetic appearance, and security and environmental features, it can belocated in almost any location indoors and outdoors.

Figure 2 shows the MetroSite BBU connected to two MetroSite BTSs.



Product Description


Figure 1. A typical simplified block diagram of a micro-cellularconfiguration

Radio Links

Local Area

Tx/RxTx/Rx

Radio Links

MetroHub MetroHubMetroSite BBU

MetroHopper

MetroHopper

MetroSite BTS

MetroSite BTS

FlexiHopper

BatteryBack-up

BatteryBack-up

Power Supplyand Control

BatteryBack-up

FlexiHopper



Introduction


Figure 2. Nokia MetroSite BBU configuration

MetroSiteBTS

MetroSiteBBU

MetroSiteBTS

115 or 240VAC

from MetroSite BBU

115 or 240VAC

from MetroSite BBU



Product Description




Features


3 FeaturesThe MetroSite BBU has many features which endear its flexibility and usage. Thefollowing is a list of its many qualities.

3.1 System compatibility

The Nokia MetroSite BBU can directly support the AC power supplies within theMetroHub and MetroSite BTS, consequently it can be introduced as an upgradeto a site at any point without the need to change the MetroHub or MetroSite BTSpower supplies.

3.2 Inherent site protection

Under normal operating conditions the mains is fed directly to the MetroSite BBUoutput, bypassing most of the internal circuitry. Thus, should a fault occur withinthe BBU while mains is present, the operation of the MetroHub or MetroSite BTSis not impaired. This greatly reduces the site downtime, even under the mostadverse conditions.

3.3 Easy implementation

Because of its small size, light weight and high level of integration, the MetroSiteBBU is quick and easy to install either indoors or outdoors with minimal sitepreparation. The extended environmental performance facilitates installationindoors or outdoors in extreme climatic conditions.



Product Description


3.4 Installation

The mounting options for the MetroSite BBU are available for both wall or pole

installations, either vertically or horizontally using the appropriate assembly kit.This enables the MetroSite BBU to be installed on lamp posts, billboards, busstops, and other previously inaccessible locations. The minimised internal cablingof the MetroSite BBU greatly reduces the installation time spent on site and witha minimum workforce.

3.5 Battery type

The MetroSite BBU features an auto-detection facility whereby the type of battery being used is identified. The MetroSite BBU adjusts the charging

parameters accordingly which makes installation quicker and easier, reducing therisk of costly mistakes.

3.6 Cost savings

The installation of the MetroSite BBU does not require extensive site planningthus site planning costs are reduced. The many installation options ease theprocess of site acquisition and reduces the user"s site rental costs. Every time amains failure occurs, the MetroSite BBU saves the customer money. Because of the low cost design philosophy and long back-up time, it is possible to recover the

MetroSite BBU costs after only a few mains failures. Locations for the MetroSiteBBU installation can be on almost every street corner in any city. Banks,restaurants, fast food restaurants, or other such premises belonging to onelandlord enable an affordable bulk acquisition. The easy commissioning andquick integration into the network ensure that the MetroSite BBU is up andrunning very soon after the installation. This means that the installation costs arekept to a minimum and the revenue flows starts immediately.



Construction and units


4 Construction and unitsThe Nokia MetroSite BBU comprises a number of units and batteries listed asfollows:

• Charger unit.

• Inverter unit.

• Control PCB.

• Internal fan unit.

• External fan unit.

• Batteries: four Hawker SBS J16X batteries

• Battery heater assembly.

• MetroSite BBU plastic cover, plastic cable cover and cable cover supportplate.

• Control panel.

• Battery connection kit

The MetroSite BBU is housed in an eclosure which is mounted onto a backplate.The enclosure is divided into sections; an electronics enclosure and a batteryenclosure.

The system controller, charger, inverter, internal fan and system circuit breakersare all mounted in the upper section of the enclosure. The lower section of theenclosure is occupied by the batteries. The external fan is fitted to a tray extendingfrom near the top of the chassis.

Access for connecting cables between the MetoSite BBU and a MetroSite BTS(s)or a MetroHub is made through the base of the enclosure.

A plastic cover fits over the enclosure and is secured to the backplate by lockingguides on the cover and recesses on the backplate. A lock assembly ensures thesecurity of the MetroSite BBU.

Figure 3 shows the principal elements comprising the MetroSite BBU.



Product Description


Figure 3. Principal MetroSite BBU elements.

DN99181238

Enclosure

Backplate

Cover

Door

Stud

Cable

Cover

CableCoverSupport

BatterySection

InverterUnit

InternalFan

ControlPCB

Note: Control Panel fits over the upper section of the enclosure

Charger

Unit

ExternalFan





4.1 System function

The relationship between the MetroSite BBU units and control PCB is shown in

Figure 4.

Figure 4. Simplified system block diagram

Mains input, either 115VAC or 230VAC, is fed to the charger unit where it ispassed to a set of switchover relay contacts and monitored for continuity andvalue. At the same time, the mains power voltage is converted by the charger toa DC voltage between 40 and 60 volts which is used to maintain the 48V batterycharge and supply the system controller PCB and inverter unit.

The inverter unit converts the 48VDC to 115VAC and 230VAC output voltages.The appropriate AC output voltage is selected by the system controller PCB and

fed to another set of contacts on the switchover relay.

During normal operation, the mains power is passed via the switchover relay tothe connected MetroSite BTS(s) or MetroHub. However, should the mains powerbe interrupted or reduced to an unsuitable level, the control PCB is activated toswitch the inverter unit to maintain circuit operation. At the same time, theswitchover relay contacts are switched to allow the inverter unit AC outputvoltage (115V or 230V as appropriate) to be passed to the connected MetroSiteBTS(s) or MetroHub to maintain operational continuity of the MetroSite system.

ALARMS

ACINPUT

(MAINS)

AC/DCCHARGER

AC(110V or 240V)

MAINS orINVERTER OUTPUT

CONTROL

BATTERIES INVERTER(DC to AC)



Product Description


When the mains power supply has been restored, the circuits revert to theiroriginal status and the mains power is restored to the connected MetroSite BTS(s)or MetroHub.

The MetroSite BBU makes use of the inbuilt hold-up time of the units it supports.

The MetroSite BTS will function for up to 130 ms without any external power.The MetroSite BBU makes use of this time to detect the failure of the mains, startup its AC true sinewave inverter, and switch the supply relay. These actions takea maximum of 26 ms.

The MetroHub, when fitted with its own internal battery, will hold up for 50minutes (with maximum power consumption at +25 oC), leaving ample time forthe MetroSite BBU to supply auxiliary power. The MetroHub is only supportedby the MetroSite BBU when the Hub is fitted with an internal battery.

4.2 Unit descriptions

4.2.1 AC to DC charger unit (HALD01)

A simplified block diagram is shown in Figure 5 and its physical appearanceshown in Figure 6.

This unit effects the following functions:

• Converts the mains power supply voltage to 48VDC for charging thebatteries and supplying the system controller PCB and inverter unit.

• A switchover relay on the board is utilised for maintaining AC voltages tothe MetroSite BTS(s) or MetroHub connected to the MetroSite BBU. In theevent of a mains power failure, the relay switches the source of the supplyoutput from the mains power to the AC voltage (115v or 230V) deliveredby the inverter unit. The relay and inverter AC output voltage is controlledby the control PCB.

• The unit detects internal faults and transmits the information to the controlPCB.

The unit is located inside an IP55 enclosure in which the ambient temperature canvary between -40 o C and +70 o C.





Product Description


Figure 6. Charger unit physical structure

4.2.2 Inverter unit (LDHA01)

A block diagram of this unit is shown in Figure 7.

CONTROL

48VDC+ _

AC/AC OUT

HIGH AC IN

INPUTL PE N





Figure 7. Inverter unit block diagram

This unit converts a low voltage DC (+48V) into a high AC voltage (either115VAC nominal or 230VAC nominal) suitable for AC mains poweredequipment.

Onboard circuits are controlled by the system controller PCB to set the ON/OFFstatus of the unit and to select the correct AC output voltage.

The inverter unit is mounted on a metal wall inside the MetroSite BBU enclosureto ensure good thermal dissipation.

4.2.3 System Controller PCBA simplified block diagram of this PCB is shown in Figure 8 and its physicalappearance in Figure 9.

+

-

ON/OFF

ACsel

FAULT

Low DC to High ACConversion

+48VDC(Battery or HALD01)

to/fromCSYS01

INVERTERUNIT

110VAC/ 230VAC

To Relay 1(output toCATS/DOGS)



Product Description


Figure 8. System controller PCB simplified block diagram

T s e n

OPTO I/O

CONTROL PCB

EEPROM

RTC

MICROCONTROLLER

To/fromBatteryCharger

E x t A

l r m

S m o k e

B a t T s t

C v r O p n

V s e n

B a t t T y p e

B a t t T y p e

F a u l t

I n t e r n a l F a n

B a t t e r y

H e a t e r

I P 5 5 E x t e r n a l

F a n

R l y D r v

M a i n s

T y p e

2

P S U c n t 1

M a i n s

T y p e

1

F a u l t

A C S e l

I n v

o n





Figure 9. System controller PCB layout (top view)

The system controller PCB has the following functions:

• Maintains the charging voltage of the batteries with respect to temperature.

• ManagesMetroSite BBUcooling by monitoring temperature and adjusting

the external fan speed accordingly.• Manages MetroSite BBU battery heaters by monitoring temperatures and

controlling heaters accordingly.

• Provides alarm and internal fault reporting.

Battery Related

FRONT

ChargerConnector

InverterConnector

ThermalSensor Alarms

Connector

Fault LED(Amber)

Battery OKLED(Green)

BatteryFaulty LED(Red)

Battery TestSwitch

9-pin 'D' TypeConnector

BatteryHeater Fuses



Product Description


• Controls the switching between the external mains power and the inverterunit AC output voltage in the event of a mains power failure.

• Ensures that the correct AC output voltage (115 VAC or 230 VAC) from

the inverter unit is selected.The board is located in the same IP55 enclosure as the charger and inverter units.

4.2.3.1 Connectivity

The system controller PCB has the following connections:

• 16-way IDC 3M P/N3408-5602UN (or similar) connector which connectsthe system controller PCB to the charger unit.

• 10-way IDC 3M 3793-6502UN (or similar) connector which connects thecontrol PCB to the inverter unit.

• 26-way external alarm and expansion connector.

• 9-pin "D" type connector used only in production.

• 4-way Molex connector (red) for external fan connection.

• 4-way Molex connector (white) not used.

• 2-way Molex conector (red) for internal fan connection.

• 2-way Molex connector (white wide pitch) for cover off sensor.

• 2-way Molex connector (white) for door sensor.

• 4-way Phoenix connector for system Dc power/LVD.

• 4-way Harwin connector for battery sense/temperature probes.

• 2-way Phoenix connecor for battery heater AC mains in.

• 3-way Phoenix connector for battery heater element power.

4.2.3.2 Signals

Input and output signals dealt with by the control PCB are outlined in Table 1 (inalphabetical order). The control PCB is able to store and retrieve alarms to/froman internal log which can be examined by an external device (see Table 2).Additionally, the control PCB provides output alarms via an external data andalarm ribbon cable connector (see Table 3). These alarms are presented asgrouped outputs and categorised as shown in the third column. They are sent tothe BTS for assimilation.





Table 1. System Controller PCB signal inputs and outputs

Name Connection DescriptionBatTst Input from Batt Test button User operated.

BattType Input from Batt Type resistor This resistor indicates which type of batterypack is tted to the system.

CvrOpn Input from Cover or chassis button Indicates if the cover or chassis door is open

Acsel Output to the inverter (LDHA01) This signal indicates which output level touse (115VAC or 230VAC)

Battery heater Output to EnclosureBatteryHeater

Supplies power to the battery heater

ExtAlm Output to MetroSite BTS externalalarm input

Refer to Nokia MetroSite BBU System Specication for details

ExtFanOn Output to external fan Controls external IP54 fan (PWM signal)

Ext Fan OK Input from external fan. DC level indicating correct fan operaion.

Fault (lnv) Input from inverter (LDHA01) Indicates if the LDHA01 has developed afault.

Fault (Chr) Input from battery charger(HALD01)

Indicates if the battery charger hasdeveloped a fault.

Int fan Output to internal fan Supplies power to the internal fan for halfand full speed operation depending uponenclosure temperature.

Int Fan OK Input based on fan current Measures whether the fan is drawing currentfor correct operation.

MainsType 1 Input from battery charger(HALD01)

Indicates whether mains AC is between 91and 144VAC

MainsType 2 Input from battery charger(HALD01)

Indicates whether mains AC is between 196and 263VAC

Inv Ctrl Output to inverter Stops and starts the inverter.

PSUcntl Output to battery charger

(HALD01)

3.8-6.2 mA signal to control output voltage

voltage.

Smoke Input from smoke sensor Not used

Tsen Input from tempertaure sensor Monitors enclosure temperature

Tsen bat Input from temperature sensor inbattery compartment

Monitors battery compartment temperature

Vsen Input from the battery Monitors batterey voltage



Product Description


4.2.4 External fan unit

The fan is located on a tray at the top of the MetroSite BBU backplate. The fanspeed is controlled by the system controller PCB in accordance with temperatureinformation provided by internal sensors. The noise of the fan is reduced with fan

speed.

4.2.5 Internal fan unit

This fan is run at two speeds: half and full speed depending on enclosuretemperature.

Table 2. Stored alarms

Alarm SignicanceCover open Enclosure cover switch circuit broken

Mains I/P off Loss of Mains Good signal from the HALD01 unit.

Battery test fail Failure of battery test

Under/over temperature Enclosure temperature <-38 o C or >]68 o C

Low voltage disconnect Low voltage disconnect function activated

Low battery warning Low battery warning activated.

Charger (HALD01) failure Fault (chr)

Inver ter (LDHA01) failure Fault (inv)

Table 3. Output alarms

Alarm Meaning

Mains IP off Loss of correct mains type signal from the HALD01

System Fail The charger and/or inverter failing to operate

Battery test fail Failure of battery test

Under/over temperature Enclosure temperature <-38 o C or >68 o C

Cover open Enclosure cover switch circuit broken

Low battery warning Low battery alarm activated





4.2.6 MetroSite BBU enclosure

The stainless steel enclosure and the units have been designed to enable easyinstallation and removal. The compact structure facilitates installation in

locations previously deemed to be inaccessible.

The stainless steel enclosure is mounted on a stainless steel backplate and iscovered with an external cover.

The modular units feature compact plug-in construction and are protected behinda control panel covering the upper section of the enclosure. The batteries arehoused in the lower section of the enclosure.

The enclosure is fitted with a single door covering both sections and has a singlelock. A DOOR OPEN/CLOSED sensor located at the top section of the enclosureis operated by the enclosure door.

The external cover shields the MetroSite BBU items from water, snow, dust orsolid foreign objects. The ingress protection and EMC shielding are provided bythe enclosure and the units. The total enclosure size is 263 x 653 x 168.5 mm.Figure 10 shows the MetroSite BBU enclosure and other parts.



Product Description


Figure 10. MetroSite BBU enclosure and parts

DN99181238

Enclosure

Backplate

Cover

Door

Stud

Cable

Cover

CableCoverSupport

BatterySection

InverterUnit

InternalFan

ControlPCB

Note: Control Panel fits over the upper section of the enclosure

Charger

Unit

ExternalFan





Product Description


Figure 12. Control panel layout

The significance of each switch, connector and LED is as follows:

• AC MAIN INPUT. This switches the mains supply to the MetroSite BBU.

• BATTERY. This switch connects the batteries to the appropriate circuits.

• CONTROLLER. This is used to switch on the control PCB.

DN9989346

AC MAIN INPUT

BATTERY

CONTROLLER

AC OUTPUT 1

AC OUTPUT 2

A C P O W E R

D C P O W E R

Heater FusesRS232OK FAIL

BATTERY

TEST

Labels

FAULT THERMALSENSOR

This connector is onControl PCB





Note

• AC OUTPUT 1. The mains power supply or inverter AC output is fed viathis switch to a MetroSite BTS or MetroHub. The switch can be used toisolate the connected MetroSite BTS or Metro Hub.

• AC OUTPUT 2. The mains power supply or inverter AC output is fed viathis switch to a second MetroSite BTS. The switch can be used to isolatethe second connected MetroSite BTS

The MetroSite BBU can have up to two MetroSite BTSs connected to it or asingle MetroHub.

• Local Management Port (9-pin, "D" type Connector). Used only inproduction.

• Battery Test. This pushbutton switch enables the user to effect a batterytest. When operated, a battery test sequence is carried out. Test time canvary from approximately 30 minutes to 6 hours depending upon the load.The pushbutton is mounted on the control PCB and projects through thecontrol panel.

• Battery LEDs. These are located on the control PCB. On completion of abattery test, the OK LED will be lit green if the test is satisfactory.Otherwise, the FAIL LED will be lit red to signal a failed battery test.

• CSYS LED. This amber LED is mounted on the system controller PCB.The LED flashes at a rate of approximately once per second to indicate thatthe MetroSite BBU is operating correcly.

4.2.6.2 Enclosure: battery section

This section is below the electronics section of the enclosure. The four 12Vbatteries are retained in position with a metal clamp plate. Figure 10 and Figure11 show the battery enclosure with four 12V batteries installed.

4.2.7 Cover, cable cover and cable cover support

The cables connecting between the MetroSite BBU and the MetroSite BTS(s) or

MetroHub feed from a hole at the bottom of the enclosure. A cable cover fits intothis hole to cover the cables. The cable cover is retained in position by the cablecover support which attaches to the chassis.

The plastic cover has locking guides on the edges facing the chassis. These guideslocate in recesses on the chassis when the cover is fitted over the enclosure. Whenthey are located, the cover is secured to the chassis by pushing the cover fullydown. A lock assembly fitted to the bottom of the chassis ensures that the covercannot be removed.



Product Description


Figure 13. Cover, cable cover and cable cover support configuration

Cable cover

310.0 mm

840.0 mm

215.0 mm

114.0 mm

Cover

Cable coversupport



Alternatives


5 AlternativesThe simplified design of the Nokia MetroSite BBU ensures that the only variablefactor is the choice of battery type. To facilitate ease of integration, differentrectifier configurations have been eliminated from the design.

The MetroSite BBU is capable of using a range of battery types. The currentdesign has been configured to accommodate the SBS J16X battery.

When backing up a load greater than 400W, batteries with a power rating greaterthan or equal to SBS J16X batteries should be used in the MetroSite BBU.

The MetroSite BBU complies with CE, FCC and UL approvals.



Product Description




Technical specifications


6 Technical specificationsThe specification details for the Nokia MetroSite BBU and individual units aredetailed in the following sections.

6.1 Mechanical and environmental specifications

6.1.1 MetroSite BBU

The mechanical and environmental specifications for the MetroSite BBU aregiven in Table 4.

6.1.2 Charger unit

Table 5 details the mechanical and environmental specifications for the chargerunit.

Table 4. MetroSite BBU mechanical and environmental specications

Property Value

Height x Width x Depth mm 840 x 310 x 215 mm

Weight including batteries 53 kg maximum including T bars

Minimum temperature limit -40 o C

Maximum temperature limit +50 o C

Ingress protection class IP55 upper enclosure section

IP54 battery section ofenclosure.



Product Description


6.1.3 Inverter unit

Table 6 details the mechanical and environmental specifications for the inverterunit.

6.1.4 System controller PCB

Table 7 details the mechanical and environmental specifications for the systemcontroller PCB.

Table 5. Mechanical and environmental specications

Property ValueHeight x Width x Depth mm 180 x 160 x 100 mm



MTBF >300,000 hours (MIL STD 217F)


Property Value




MTBF >200,000 hours


Property Value




MTBF >300,000 hours (MIL STD 217F)





6.2 Electrical specifications

6.2.1 MetroSite BBU

The electrical specifications for the MetroSite BBU are given in Table 8 and thebattery electrical specifications are in Table 9.

6.2.2 Charger unit

The electrical specifications relating to the charger unit are given in Table 10.

Table 8. MetroSite BBU electrical specications

Property Value

Nominal external supply voltage 230V; 110V

Permitted operating voltage

uctuation

85VAC - 300VAC; 44Hz - 65Hz

Maximum continuous powerdemand

800W

Maximum power demand 1150W for 30 seconds

I/P inrush power 4100W for 5 ms

Table 9. Battery electrical specications

Parameter ValueBattery voltage 4 x 12V (using SBS J16X batteries)

Ampere hours rating 16 (using SBS J16X batteries)

Backup time for one 5W MetroSiteBTS

75 minutes at +25 oC (using SBSJ16X batteries)

Alternative battery parameters See MetroSite Hub Product Overview



Product Description


6.2.3 Inverter unit

The electrical specifications relating to the inverter unit are given in Table 11 .

Table 10. Charger electrical specications

Parameter ValueMains voltage I/P 85VAC to 300VAC nominal

Mains frequency 44Hz to 65Hz nominal

Input inrush current 6A maximum; settled to within 10% ofmaximum steady state current within100ms

Output voltage Controllable between 40VDC and59.5VDC; reduces in accordance withcurrent limiting control from thesystem controller.

Output current 0A to 4A maximum; limited to 4Amaximum

Electrical isolation Output to input electrical isolation

Efciency 85% over full input voltage andfrequency ranges with O/P powerlevels above 80% of full O/P power.

Opto-isolators Able to pass 70V signal on the opto-transistor side.

Mains line detect (to control PCB) Line 1: conducts if mains voltage isbetween 196VAC +5V/-0VAC and263VAC +0V/-5VAC Line 2: conductsif mains voltage is between 91VAC+5V/-0VAC and 144VAC +0V/-5VAC





6.2.4 System Controller PCB

The electrical specifications relating to the control PCB are given in Table 12.

Table 11. Inverter electrical specications

Parameter ValueInput voltage (battery) 42VDC minimum; 48VDC typical;

60VDC maximum

Input current 10A typical; 20A maximum(continuous); 29A peak (30s)

Input power 842W maximum (continuous);1160W at 93% efciency to 1375W at80% efciency

Output voltage: 110VAC mode 95VAC minimum; 110VAC typical;145VAC maximum

Output voltage: 230VAC mode 200VAC minimum; 230VDC typical;240VDC maximum

Output power 0W minimum; 800W maximum1150W peak (30s); 2300W peak(25ms) Note: efciency may reducelinearly from 93% to 80% as power isincreased from 800W to 1150W

Frequency 64Hz minimum; 65Hz typical; 66Hzmaximum Note: the higher frequencyis to reduce stress on the power relaywith the inverter waveform

Efciency Nominal efciency >89%

Under light load conditions, totalpower wastage <30W.

Table 12. Control PCB electrical specications

Parameter Value

Input voltage 38VDC minimum; 54VDC typical;62VDC maximum

Power 15W maximum

Sensor inputs and device controloutputs

10mA/line maximum



Product Description


6.3 Compliance qualifications

The MetroSite BBU complies with the European and US approvals requirements

concerning EMC, Safety (Electrical) and Environmental. The following tablesdetails the standards to which the MetroSite BBU complies; reference should bemade to the Statement of Compliance (SoC) V.6.0.0 for more global information.

6.3.1 EMC qualification

The standards to which the MetroSite BBU comply are detailed in the followingtable.

Table 13. EMC qualication

Standard Description

EN 55022:Class B:1994 A2:1997

Limits and methods of measurement of radio interferencecharacteristics of information technology equipment.

EN 50081-1: 1992 Electromagnetic compatibility - generic emission standard Par t1 :residential, commercial and light industry.

EN 50082-2:1995 Electromagnetic compatibility - generic immunity standard Part 1:Industrial environment

EN 61000-4-2: 1995 (IEC1000-4-2: 1995)

Electromagnetic compatibility (EMC) Part 4: Testing andmeasurement techniques - Section 2: electrostatic discharge test

EN 61000-4-3: 1995 (IEC61000-4-3: 1995) (IEC 1000-4-3: 1995)

Electromagnetic compatibility (EMC) Part 4: testing andmeasurement techniques - Section 3: radiated radio frequencyelectromagnetic eld immunity test

EN 61000-4-4: 1995 (IEC1000-4-4: 1995)

Electromagnetic compatibility (EMC) Part 4: testing andmeasurement techniques - Section 4: electrical fast transient/ burst immunity test.

EN 61000-4-5: 1995 (IEC1000-4-5: 1995)

Electromagnetic compatibility (EMC) Part 4: testing andmeasurement techniques - Section 5: surge immunity test.

EN 61000-4-6: 1996 + A1:1996 (IEC 1000-4-6: 1996)

Electromagnetic compatibility (EMC) Part 4: testing andmeasurement techniques - Section 6: immunity to conducteddisturbances induced by radio frequency elds.

EN 61000-4-11: 1994 (IEC1000-4-11: 1994)

Electromagnetic compatibility (EMC) Part 4: testing andmeasurement techniques - Section 11: voltage dips, shortinterruptions and voltage variations immunity test.





6.3.2 Electrical safety

The following table identifies the electrical standards to which the MetroSiteBBU complies.

6.3.3 Environmental

The following table details the MetroSite BBU environmental standards.

PrETS 300-386-1: October1994 [Final Draft]

Equipment Engineering (EE); Public telecommunicationsnetwork equipment Electromagnetic Compatibility (EMC)requirements - Part 1: product family overview, compliancecriteria and test levels.

PrETS 300-386-1-3: 1995-04-05 [Draft]

Equipment Engineering (EE); Public telecommunicationsnetwork equipment Electromagnetic Compatibility (EMC)requirements - Part 2 - Part 3: product specic compliancecriteria and operating conditions - power supply equipment.

CFR Title 47 Part 15, FCCrules - subpart B: 1995

Part 15: Non-licensed equipment: Unintentional radiators.

Table 13. EMC qualication (Continued)


Table 14. Electrical safety


BS EN 60950: 1992 up to

and including A4: 1997

Safety of information technology equipment, including

electrical business equipment.EN 60950: 1992 up to andincluding A4: 1997

Safety of information technology equipment, includingelectrical business equipment.

UL1950: 1995, 3 rd Edition Standard for safety of information technologyequipment, including electrical business equipment.



Product Description

6.3.4 Noise levels

The acoustic noise emanating from the MetroSite BBU is in accordance with ISO3743 and does not exceed 40 dB (A).

Table 15. Environmental standards

Standard DescriptionIEC 721-3-4: 1995:Amendment 1

Classication of environmental conditions - Part 3:Classicationof groups of environmental parameters andtheir severities Section 4: Stationary use at non-weatherprotected locations

ETS 300 019-1-1: 1992 Equipment engineering; environmental conditions andenvironmental tests for telecommunications equipment.Part 1-1: Classication of environmental conditions:Storage

ETS 300 019-2-1: 1994 Equipment engineering; environmental conditions andenvironmental tests for telecommunications equipment.

Part 2-1: Specication of environmental tests: Storage

ETS 300 019-1-2: 1992 Equipment engineering; environmental conditions andenvironmental tests for telecommunications equipment.Part 1-2: Classication of environmental conditions:Transportation

ETS 300 019-2-2: 1994 Equipment engineering; environmental conditions andenvironmental tests for telecommunications equipment.Part 2-2: Specication of environmental tests:Transportation

ETS 300 019-1-4: Class 4.1:including A1: June 1997

Equipment engineering; environmental conditions andenvironmental tests for telecommunications equipment.Part 1-4: Classication of environmental conditions:stationary use at non-weather protected locations.

ETS 300 019-2-4: Class 4.1:including A1: June 1997

Equipment engineering; environmental conditions andenvironmental tests for telecommunications equipment.Part 2-4: Specication of environmental tests: stationaryuse at non-weather protected locations.

BS EN 60529: 1992 Specication for degrees of protection provided byenclosures (IP code) (IP55 in this case)

Documents

Nokia MetroSite BBU Product Description