powerbeamm ubnt

8192019 PowerBeamM ubnt

httpslidepdfcomreaderfullpowerbeamm-ubnt 113

High-Performance airMAXreg Bridge

Models PBE-M5-620 PBE-M5-400 PBE-M5-300 PBE-M2-400

Uniform Beamwidth Maximizes Noise Immunity

Innovative Mechanical Design

High-Speed Processor for Superior Performance

DATASHEET



D a t a s h e e t

2

Application Examples

PtMP Client Links

The PowerBeam used as a CPE device for each client in an airMAX PtMP network

Wireless Client PtP Link

The PowerBeam as a powerfulwireless client

Use a PowerBeam on each side of aPtP link

OverviewStarting with the rst-generationNanoBridgereg Ubiquiti Networkspioneered the all-in-one design for anairMAXreg product functioning as a CPE(Customer Premises Equipment) NowUbiquiti Networks launches the latestgeneration of CPE the PowerBeamtrade

Improved Noise Immunity The PowerBeam directs RF energy in atighter beamwidth With the focus inone direction the PowerBeam blocksor spatially lters out noise so noiseimmunity is improved This featureis especially important in an areacrowded with other RF signals of thesame or similar frequency

Integrated Design

Ubiquitirsquos InnerFeedtrade technologyintegrates the radio into the feedhornof an antenna so there is no need for

a cable This improves performancebecause it eliminates cable losses

Providing high performance andinnovative mechanical design at alow cost the PowerBeam is extremelyversatile and cost-effective to deploy

airMAX Technology Included

Unlike standard Wi-Fi protocolUbiquitirsquos Time Division MultipleAccess (TDMA) airMAX protocolallows each client to send and receivedata using pre-designated time

slots scheduled by an intelligent APcontroller

This time slot method eliminateshidden node collisions andmaximizes airtime efciency Itprovides signicant performanceimprovements in latency throughputand scalability compared to all otheroutdoor systems in its class

Intelligent QoS Priority is given tovoicevideo for seamless streaming

Scalability High capacity andscalability

Long Distance Capable ofhigh-speed carrier-class links

airMAX TDMA Technology

T i m e S l o t 1

T i m e S l o t 2

T i m e S l o t 3

T i m e S l o t 4

Timeline

Time Slots

Packet Prioritization

V O I P

D a t a

V O I P

V O I P

Up to 100 airMAX stations can be connected to an airMAX Sector four airMAXstations are shown to illustrate the general concept



Software

airOSreg is an intuitive versatilehighly developed Ubiquiti rmwaretechnology It is exceptionallyintuitive and was designed to requireno training to operate Behindthe user interface is a powerful

rmware architecture whichenables high-performance outdoormulti-point networking

bull Protocol Support

bull Ubiquiti Channelization

bull Spectral Width Adjustment

bull ACK Auto-Timing

bull AAP Technology

bull Multi-Language Support

Integrated on all Ubiquiti Mproducts airViewreg providesadvanced spectrum analyzerfunctionality waterfall waveformand real-time spectral views allowoperators to identify noise signaturesand plan their networks to minimizenoise interference

bull Waterfall Aggregate energy overtime for each frequency

bull Waveform Aggregate energycollected

bull Real-time Energy is shown in realtime as a function of frequency

bull Recording Automate airView torecord and report results

airControlreg is a powerful andintuitive web-based server networkmanagement application whichallows operators to centrally manage

entire networks of Ubiquiti devicesbull Network Map

bull Monitor Device Status

bull Mass Firmware Upgrade

bull Web UI Access

bull Manage Groups of Devices

bull Task Scheduling



D a t a s h e e t

4

Hardware OverviewInnovative Mechanical Designbull Built-in mechanical tilt The mounting bracket

conveniently offers 20deg of uptilt and up to 20deg ofdowntilt

bull Quick assembly The number of fasteners was reducedto simplify assembly Tools are required only when thetechnician mounts the PowerBeam on the pole

bull Easy removal The antenna feed can be detached withthe push of a button

Corrosion Resistancebull Fasteners GEOMET-coated for improved corrosion

resistance when compared with zinc-plated fasteners

bull Dish and brackets Made of galvanized steel that ispowder-coated for superior corrosion resistance

The redesigned pole bracket for the 400 mm dish andfender washers for the 300 mm dish prevent paint from

being removed from the metal brackets for improvedcorrosion resistance

Models

Model Frequency Gain Dish Reector

PBE-M5-620 5 GHz 29 dBi 620 mm

The PBE-M5-620 supports up to 150+ Mbps real TCPIPthroughput



The PBE-M5-400 supports up to 150+ Mbps real TCPIPthroughput Its Antenna Feed has a thin gray ring aroundthe center of the cap to differentiate it from the PBE-M5-300Antenna Feed



Models



The PBE-M5-300 supports up to 150+ Mbps real TCPIP

throughput


PBE-M2-400 24 GHz 18 dBi 400 mm


Model PBE-M2-400 PBE-M5-400 PBE-M5-300

PBE-RAD-400 uuml uuml NA

A protective radome is available as an optional accessory for thePBE-M2-400 and PBE-M5-400



D a t a s h e e t

6

Specifcations

PBE-M5-620 System and RegulatoryCompliance

Processor Specs Atheros MIPS 74Kc 560 MHz

Memory 64 MB DDR2 8 MB Flash

Networking Interface (1) 101001000 Ethernet Port

Wireless Approvals FCC IC CE

RoHS Compliance Yes

PBE-M5-620 PhysicalElectricalEnvironmental

Dimensions 620 x 620 x 386 mm (2441 x 2441 x 152)

Weight 64 kg (1411 lb)

Power Supply 24V 05A Gigabit PoE

Power Method Passive PoE (Pairs 4 5+ 7 8 Return)

Max Power Consumption 85W

Gain 29 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz

Wind Loading 872 N 200 kmh (196 lbf 125 mph)

Wind Survivability 200 kmh (125 mph)

LEDs (1) Power (1) LAN (4) WLAN

Signal Strength LEDs Software-Adjustable to Correspond to Custom RSSI Levels

Channel Sizes 5810203040 MHz

Polarization Dual Linear

Enclosure Outdoor UV Stabilized Plastic

Mounting Pole-Mount Kit Included

ESDEMP Protection Air plusmn 24 kV Contact plusmn 24 kV

Operating Temperature -40 to 70deg C (-40 to 158deg F)

Operating Humidity 5 to 95 Noncondensing

Salt Fog Test IEC 68-2-11 (ASTM B117) Equivalent MIL-STD-810 G Method 5095

Vibration Test IEC 68-2-6

Temperature Shock Test IEC 68-2-14

UV Test IEC 68-2-5 at 40deg C (104deg F) Equivalent ETS 300 019-1-4

Wind-Driven Rain Test ETS 300 019-1-4 Equivalent MIL-STD-810 G Method 5065



Specifcations

PBE-M5-620 Output Power 24 dBm

TX Power Specifcations RX Power Specifcations

Modulation Data Rate Avg TX Tolerance Modulation Data Rate Sensitivity Tolerance

8 0 2 1 1 a

6 - 24 Mbps 24 dBm plusmn 2 dB

8 0 2 1 1 a

6 - 24 Mbps -94 dBm Min plusmn 2 dB

36 Mbps 24 dBm plusmn 2 dB 36 Mbps -80 dBm plusmn 2 dB



8 0 2 1 1 n a i r M A X

MCS0 24 dBm plusmn 2 dB

8 0 2 1 1 n a i r M A X

MCS0 -96 dBm plusmn 2 dB

MCS1 24 dBm plusmn 2 dB MCS1 -95 dBm plusmn 2 dB















PBE-M5-620 Antenna Information

Gain 29 dBi

Max VSWR 161

Built-In Mechanical Downtilt +15deg to -15deg

Return Loss E-Plane E-Plane Specs

H-Plane H-Plane Specs



D a t a s h e e t

8

Specifcations






RoHS Compliance Yes







Gain 25 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151


Return Loss Vertical Azimuth Vertical Elevation

Horizontal Azimuth Horizontal Elevation



D a t a s h e e t

10

Specifcations






RoHS Compliance Yes




Power Supply 24V 05A PoE



Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151

Built-In Mechanical Downtilt +20deg





D a t a s h e e t

Specifcations






RoHS Compliance Yes






Max Power Consumption 6 W

Gain 18 dBi

Operating Frequency 2405 - 2475 MHz








Mounting Pole-Mount Kit IncludedESDEMP Protection Air plusmn 24 kV Contact plusmn 24 kV










Specications are subject to change Ubiquiti p roducts are sold with a limited warranty described at wwwubntcomsupportwarranty

copy2013-2014 Ubiquiti Networks Inc All rights reserved Ubiquiti Ubiquiti Networks the Ubiquiti U logo the Ubiquiti beam logo airControl airMAX wwwubntcom

Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






D a t a s h e e t

2

Application Examples

PtMP Client Links

The PowerBeam used as a CPE device for each client in an airMAX PtMP network

Wireless Client PtP Link

The PowerBeam as a powerfulwireless client

Use a PowerBeam on each side of aPtP link

OverviewStarting with the rst-generationNanoBridgereg Ubiquiti Networkspioneered the all-in-one design for anairMAXreg product functioning as a CPE(Customer Premises Equipment) NowUbiquiti Networks launches the latestgeneration of CPE the PowerBeamtrade

Improved Noise Immunity The PowerBeam directs RF energy in atighter beamwidth With the focus inone direction the PowerBeam blocksor spatially lters out noise so noiseimmunity is improved This featureis especially important in an areacrowded with other RF signals of thesame or similar frequency

Integrated Design

Ubiquitirsquos InnerFeedtrade technologyintegrates the radio into the feedhornof an antenna so there is no need for

a cable This improves performancebecause it eliminates cable losses

Providing high performance andinnovative mechanical design at alow cost the PowerBeam is extremelyversatile and cost-effective to deploy

airMAX Technology Included

Unlike standard Wi-Fi protocolUbiquitirsquos Time Division MultipleAccess (TDMA) airMAX protocolallows each client to send and receivedata using pre-designated time

slots scheduled by an intelligent APcontroller

This time slot method eliminateshidden node collisions andmaximizes airtime efciency Itprovides signicant performanceimprovements in latency throughputand scalability compared to all otheroutdoor systems in its class

Intelligent QoS Priority is given tovoicevideo for seamless streaming

Scalability High capacity andscalability

Long Distance Capable ofhigh-speed carrier-class links

airMAX TDMA Technology

T i m e S l o t 1

T i m e S l o t 2

T i m e S l o t 3

T i m e S l o t 4

Timeline

Time Slots

Packet Prioritization

V O I P

D a t a

V O I P

V O I P

Up to 100 airMAX stations can be connected to an airMAX Sector four airMAXstations are shown to illustrate the general concept



Software







bull AAP Technology











bull Web UI Access





D a t a s h e e t

4










Models









Models




throughput


PBE-M2-400 24 GHz 18 dBi 400 mm







D a t a s h e e t

6

Specifcations






RoHS Compliance Yes







Gain 29 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 29 dBi

Max VSWR 161






D a t a s h e e t

8

Specifcations






RoHS Compliance Yes







Gain 25 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






Software







bull AAP Technology











bull Web UI Access





D a t a s h e e t

4










Models









Models




throughput


PBE-M2-400 24 GHz 18 dBi 400 mm







D a t a s h e e t

6

Specifcations






RoHS Compliance Yes







Gain 29 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 29 dBi

Max VSWR 161






D a t a s h e e t

8

Specifcations






RoHS Compliance Yes







Gain 25 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






D a t a s h e e t

4










Models









Models




throughput


PBE-M2-400 24 GHz 18 dBi 400 mm







D a t a s h e e t

6

Specifcations






RoHS Compliance Yes







Gain 29 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 29 dBi

Max VSWR 161






D a t a s h e e t

8

Specifcations






RoHS Compliance Yes







Gain 25 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






Models




throughput


PBE-M2-400 24 GHz 18 dBi 400 mm







D a t a s h e e t

6

Specifcations






RoHS Compliance Yes







Gain 29 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 29 dBi

Max VSWR 161






D a t a s h e e t

8

Specifcations






RoHS Compliance Yes







Gain 25 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






D a t a s h e e t

6

Specifcations






RoHS Compliance Yes







Gain 29 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 29 dBi

Max VSWR 161






D a t a s h e e t

8

Specifcations






RoHS Compliance Yes







Gain 25 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 29 dBi

Max VSWR 161






D a t a s h e e t

8

Specifcations






RoHS Compliance Yes







Gain 25 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






D a t a s h e e t

8

Specifcations






RoHS Compliance Yes







Gain 25 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 25 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






D a t a s h e e t

10

Specifcations






RoHS Compliance Yes







Gain 22 dBi

Operating Frequency

Worldwide

USA

5170 - 5875 MHz

5725 - 5850 MHz



















Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






Specifcations




8 0 2 1 1 a


8 0 2 1 1 a





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 22 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151






D a t a s h e e t

Specifcations






RoHS Compliance Yes







Gain 18 dBi





















Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151








Specifcations




8 0 2 1 1 g


8 0 2 1 1 g





8 0 2 1 1 n a i r M A X


8 0 2 1 1 n a i r M A X


















Gain 18 dBi

Max VSWR 151




powerbeamm ubnt

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