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Airspan AirHarmony-4400, Installation Manual

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Airspan AirHarmony-4400 Installation Manual Download Page 42

AirHarmony-4400 (External Cavity Filters) Installation Guide 

UGD-D01186 

Airspan Commercial and Internal Use 

36 

 

3.

 

Drill a minimum 7/16” hole to accept the 3/8-16 threaded rod. 

4.

 

Thread the 3/8-16 threaded rod into the provided clinch-nut attached on the Pole/Wall 
mounting plate. 

5.

 

Holding the mounting plate (with the attached threaded rod) pass the 3/8-16 threaded rod 
through the drilled hole in the pole. 

6.

 

Install on the exposed thread that protrudes from pole a flat washer, split washer, and 
then a 3/8”-16 hex nut and tighten. 

7.

 

Insert the clamp bands by passing them through the slots in the mounting plate, in three 
(3) places. 

Note:

 The clamp bands are not supplied by Airspan and are the responsibility of the 

installer. Clamp bands should not be wider than 15.5 mm in order to fit in the slots on 
the mounting plate. 

 

8.

 

Tighten the clamp bands with large flat screwdriver. 

 

Figure 26: Mounting plate on pole 

 

 

 

 

Summary of Contents for AirHarmony-4400

Page 1: ...AirHarmony 4400 Installation Guide External Cavity Filters Part Number UGD D01186 System Release 15 0 Revision A Published December 2016 ...

Page 2: ...of any information facts and or opinions contained therein No responsibility is assumed by Airspan Networks Ltd for the use of the documents nor for the rights of third parties which may be effected in any way by the use thereof The provision of these documents and the documents themselves does not constitute professional advice of any kind Any representation s in these documents concerning perfor...

Page 3: ... 3 Important Safety Instructions 4 Safety 4 Securite 5 Warning of Hazardous Voltages 5 Attention aux Voltages Hasardeux 5 Adherence to European Directive 1999 5 EC 6 Warning Symbols 6 Service Information 6 UL Information 7 Lightning Protection 7 Outdoor Ethernet Cabling 8 DECLARATION OF CONFORMITY 8 GPS Compliance 9 Maximum Output TX Total Power 9 Power Consumption 10 Antenna System 10 Long Switch...

Page 4: ...ed 17 2 1 Workflow of Installation 17 2 2 AirHarmony 4400 Installation Checklist 18 3 Verifying Prerequisites 18 3 1 Verifying Site Requirements 18 3 2 Verify Installation Requirements 18 3 2 1 Verify the Tools 18 3 2 2 Verify the Parts and Kits 19 3 2 3 Power Supply and Current 21 3 2 4 Panels 22 3 2 5 Physical Dimensions 23 3 2 6 Environmental 24 4 Installing AirHarmony 4400 25 4 1 Rear External...

Page 5: ...able to AirHarmony 4400 49 5 5 1 Power Cable Preparation 49 5 5 2 Securing Connector Clamp 53 A Job Sheet 54 B Abbreviations 55 Figures Figure 1 AirHarmony 4400 with external cavity filters cover 11 Figure 2 AirHarmony 4400 with Front Rear Filter Sets cover 16 Figure 3 Workflow 17 Figure 4 AirHarmony 4400 Unit Bottom panel 22 Figure 5 AirHarmony 4400 Unit Top panel 23 Figure 6 AIrHarmony 4400 in H...

Page 6: ...on Wooden Pole 41 Figure 34 AirHarmony mounted on Concrete Pole 42 Figure 35 AirHarmony being mounted on a Wall 43 Figure 36 Grounding 44 Figure 37 DIN 4 1 9 5 connectors external thread 45 Figure 38 Gland connector copper 46 Figure 39 Ethernet Cable through connector 46 Figure 40 LC duplex cable assembly 47 Figure 41 Cable connector hook up to the board connector 47 Figure 42 Slide on inner housi...

Page 7: ...an Commercial and Internal Use v Table 6 Typographic Conventions 12 Table 7 Minimum Hardware Requirements 18 Table 8 Parts Kits 19 Table 9 Amperage Draw 22 Table 10 AirHarmony 4400 Physical Dimensions 23 Table 11 AirHarmony 4400 Environment Compliance 24 Table 12 Job Sheet 54 ...

Page 8: ...ils procedures for installing the Airspan s AirHarmony 4400 EXT a Macro class eNodeB variant and its place in the Airspan product suite This document is intended for qualified personnel with a working knowledge of LTE Revision History Revision Details Date Summary of Changes Rev 0 1 November 2016 Initial document draft Comments Rev A December 2016 Publish ...

Page 9: ... service the equipment The device cannot be sold retail to the general public or by mail order It must be sold to operators Installation must be controlled Installation must be performed by licensed professionals Installation requires special training The AirHarmony 4400 should be installed ONLY by experienced installation professionals who are familiar with local building and safety codes and whe...

Page 10: ...ns could cause bodily injury and or product failure Safety 1 Read this guide and follow all operating and safety instructions 2 Static sensitive components inside do not remove the lid or base No user serviceable parts inside 3 The ground connection should be made before connecting to supply connections 4 Position the power cord to avoid possible damage do not overload circuits 5 Do not place this...

Page 11: ...en vigueur localement 10 L installation de AirHarmony 4400 doit être contractualisée avec un installateur professionnel 11 L interrupteur de circuit électrique doit être facilement accessible afin de pouvoir déconnecter l équipement 12 Lors de l installation de la configuration finale le produit doit être conforme aux Standards de Sécurité en vigueur ainsi qu aux exigences réglementaires du pays d...

Page 12: ...that may result from exposure to electromagnetic fields Airspan equipment is compliant with CE and R TTE regulations and can be operated in all EU European Union locations listed below Country Code BE EL LT PT BG ES LU RO CZ FR HU SI DK HR MT SK DE IT NL FI EE CY AT SE IE LV PL UK Warning Symbols The following symbols may be encountered during installation or troubleshooting These warning symbols ...

Page 13: ...if these guidelines are followed All outdoor wireless equipment is susceptible to lightning damage from a direct hit or induced current from a near strike Lightning protection and grounding practices in local and national electrical codes serve to minimize equipment damage service outages and serious injury Reasons for lightning damage are summarized as Poorly grounded tower antenna sites that can...

Page 14: ...d den weiteren entsprecheneden Vorgaben der Richtlinie 1999 5 EU Dansk Dette udstyr er i overensstemmelse med de væsentlige krav og andre relevante bestemmelser i Directiv 1999 5 EF Español Este equipo cumple con los requisitos esenciales asi como con otras disposiciones de la Directive 1999 5 EC Greek ΜΕ ΤΗΝ ΠΑΡΟΥΣΑ Airspan ΔΗΛΩΝΕΙ ΟΤΙ Ο ΕΞΟΠΛΙΣΜΟΣ ΣΥΜΜΟΡΦΩΝΕΤΑΙ ΠΡΟΣ ΤΙΣ ΟΥΣΙΩΔΕΙΣ ΑΠΑΙΤΗΣΕΙΣ ΚΑΙ ...

Page 15: ...Common Regulatory Testing standards EN55022 Radiated and Conducted Emissions CISPR 22 Class B EN 50081 1 Generic Emissions Class B EN 50082 1 Generic Immunity Class B EN 61000 4 2 Electrostatic Discharge Immunity EN 61000 4 3 Radiated RF EM Field Immunity Test EN 61000 4 4 Electrical Fast Transient Burst Test EN 61000 4 6 Conducted Immunity EN 61000 4 8 Magnetic Field Immunity Note A GPS is recomm...

Page 16: ...erent antenna options and formats A typical installation will have a cross polar sector or dual slant antenna connected to the approprate Cavity filter of the AirHarmony 4400 variant unit Various antennas are designed specifically for AirHarmony 4400 deployments specifications are available from Airspan separately Long Switched Beam Antenna Long Switched Beam antenna variant includes a steerable a...

Page 17: ...ant or cross polarized fixed antenna which are connected via two 2 DIN connectors located on the top panel or to the external Cavity filter The antenna should be mounted to its appropriate mounting facility Note When utilized in conjunction with iRelay as backhaul maintain a vertical separation of at least 2 ft 0 6 m Figure 1 AirHarmony 4400 with external cavity filters cover ...

Page 18: ... with Airspan s iBridge and iRelay transport solutions AirHarmony 4400 supports an integrated PoE interface which powers and connects either iBridge iRelay or a third party WiFi Access Point This configuration creates a single piece installation that supports full end to end IPv6 plug and play deployment by just adding power For more details please refer to the iBridge and iRelay product specifica...

Page 19: ...ny 4400 and its installation Getting Started Provides workflows for initial install and workflow Verifying Prerequisites Lists the hardware software and client requirements for installation AirHarmony 4400 Installation Describes how to install AirHarmony 4400 GPS Installation Describes how to install the GPS antenna Connect and Manage Cables Describes how to connect the cables Job Sheet Provides i...

Page 20: ... issue and sends an issue number for your reference The system uses this issue number to categorize and store e mails under the appropriate issue To help Customer Care Help Desk identify your issue include the issue number and your Customer Care Helpdesk account details in all further communications Main Operations Airspan Communications Ltd Capital Point 33 Bath Road Slough Berkshire SL1 3UF Unit...

Page 21: ...e targeted to blend seamlessly into the urban environment This compact outdoor product minimizes physical footprint power consumption and operator OPEX AirHarmony 4400 is a 2T2R solution that enables a flexible deployment scenarios but can achieve higher coverage and throughput by combing multiple eNodeBs enabling the support of 4T4R 4T8R and 8T8R AirHarmony 4400 implements 2 x 20W transmitters 2 ...

Page 22: ... grounded 16AWG minimum according with NEC and other local safety code requirements Warning Required circuit breaker for AC power source 16A for EU installation and 20A for US installation Minimum 10A Figure 2 AirHarmony 4400 with Front Rear Filter Sets cover Note External Filters set are sold separately and are installed on site by the customer ...

Page 23: ...mmercial and Internal Use 17 2 Getting Started 2 1 Workflow of Installation The Workflow to install the AirHarmony 4400 is displayed in the following diagram Figure 3 Workflow Caution Antennas and External filters must be connected and attached before AirHarmony 4400 is powered on ...

Page 24: ...the installation is detailed in the Job Sheet see Appendix_A 3 1 Verifying Site Requirements To set up the AirHarmony 4400 an IP connection to a Netspan server is required 3 2 Verify Installation Requirements 3 2 1 Verify the Tools Table 7 Minimum Hardware Requirements Tool Use Medium Phillips head screw driver for securing the M5 Pan Head screws on Filter sets 13 wrench for securing the M8 Hex He...

Page 25: ...and HAR44 FLTR KIT U41L 903 03 264 AirHarmony 4400 External filters set B41 Low Band U41 Low External IP67 Single Cavity Filter 2496 2568MHz DIN 4 1 9 5 f connectors X4 Filter set mounting with screws Harmony440 0 External filters set B41 High Band HAR44 FLTR KIT U41H 903 03 266 AirHarmony 4400 External filters set B41 High Band U41 High Single External IP67 Cavity Filter 2618 2690MHz DIN f 4 1 9 ...

Page 26: ...AISG 10m CBL SBAL CTRL 10 1 680 00 194 Long SBA control cable AISG to AISG 16m CBL SBAL CTRL 16 1 680 00 195 Full AXS SM Fiber Cable Full AXS SM Fiber Cable 5m Outdoor LC DPX to LC IP67 FIB FA 5 LC SM 1 686 00 016 Full AXS SM Fiber Cable 7 5m Outdoor LC DPX to LC IP67 FIB FA 7 5 LC SM 1 686 00 017 Full AXS SM Fiber Cable 15m Outdoor LC DPX to LC IP67 FIB FA 15 LC SM 1 686 00 015 Full AXS SM Fiber ...

Page 27: ... 00 012 Full AXS SM Fiber Cable 150m Outdoor LC DPX to LC IP67 FIB FA 150 LC SM 1 686 00 013 Full AXS SM Fiber Cable 200m Outdoor LC DPX to LC IP67 FIB FA 200 LC SM 1 686 00 014 3 2 3 Power Supply and Current AirHarmony 4400 supports direct connection to AC power source Operational Voltage Range 100VAC 240VAC 47Hz 63Hz Warning Power provided by PoE outputs RJ45 ETH1 ETH2 cannot be considered limit...

Page 28: ...e 22 Table 9 Amperage Draw Duplex Tx Power at RF Port dBm Maximum Power Consumption W TDD FC1 2 x 43 340 FDD 2 x 43 340 3 2 4 Panels The following figures display the AirHarmony 4400 bottom and top panels The following displays the AirHarmony 4400 s bottom panel Figure 4 AirHarmony 4400 Unit Bottom panel ...

Page 29: ...Top panel 3 2 5 Physical Dimensions AirHarmony 4400 is in an all outdoor enclosure Table 10 AirHarmony 4400 Physical Dimensions Variant Dimensions H x W x D AirHarmony 4400 509 x 262 x 252 mm 20 0 x 10 3 x 9 9 inch Weight Main Unit without filter sets 19 6 Kg 43 21 Lbs Main Unit with filter sets 26 Kg 57 32 Lbs Universal mounting bracket 3 Kg 6 6 Lbs Quadruple Filter Set Band 41 6 Kg 13 2 Lbs ...

Page 30: ...ure controlled locations ETSI EN 300 019 1 2 Transportation Table 11 AirHarmony 4400 Environment Compliance Type Details Standard Compliance Operating temperature 40 C to 55 C 40 F to 131 F ETSI 300 019 1 4 Operating humidity 5 100 non condensing ETSI 300 019 1 4 Storage temperature 40 C to 70 C N A Storage humidity 5 100 non condensing ETSI 300 019 1 4 Rain and dust ingress protection IP66 N A Op...

Page 31: ...r use 2 Carefully remove the AirHarmony unit from the packaging and stand on end Caution Make sure that the AirHarmony unit is standing securely 3 Remove the lower polyethylene packing foam and set down 4 Lie the AirHarmony unit down in the horizontal position on packing foam so as to facilitate assembly of the rear external filters set either Low High or Full Band Figure 6 AIrHarmony 4400 in Hori...

Page 32: ...ters set in place 8 Position the rear external filters set on the AirHarmony 4400 in position so the slots on the sides align with the M5 pan head screws on the unit s back plate 9 Insert all four 4 M5 screws supplied and tighten with screwdriver Figure 8 Mounting Rear External Filters set 10 Loosen the eight 8 M5 screws on the filters to allow easy alignment of with RF connector 11 Align the back...

Page 33: ... fit together then tighten the connector Figure 10 Fitting RF Connector Caution Take care not to over tighten the RF connector The connector nut should be tightened to a nominal torque of no more than 15 N m 11 06 lb ft Using either 22 mm or 7 8 open end torque wrench 13 After tightening both RF connectors proceed to tighten the eight 8 M5 screws on the filters Figure 11 Tighten the Filter Screws ...

Page 34: ... to the connections Proceed to assemble the front external filter set 4 2 Front External Filter Set Assembly Note Both External Filters sets should be assembled on the AirHarmony 4400 prior to installing on the pole wall mount Airspan recommends doing the assembly on a steady secure surface 1 Turn the unit over in preparation for the Front External Filters set assembly and lie the AirHarmony 4400 ...

Page 35: ...0 Band 41 Low Filter 2496 2568 MHz with a White label AirHarmony 4400 Band 41 High Filter 2618 2690 MHz with a Black label AirHarmony 4400 Band 41 Full Range Filter 2496 2690 MHz with a Silver label Figure 14 External Filters Set Note The External Filters Set come assembled with the M5 pan head screws holding the external filters in place on the Filter bridge and M5 pan head screws holding the cov...

Page 36: ... AirHarmony 4400 in position on the Sun Shield so the slots on the sides align with the M5 pan head screws projecting from the Sun Shield Figure 16 Mounting External Filters set on Sun shield 6 Loosen the four 4 M5 screws on the filter cover that lock the filter cover in place on the External Filters set 7 Pull up slightly on the filter cover bottom to release the cover a bit and pull the cover up...

Page 37: ...letely Figure 18 Cover opened 9 Slide the filter to align it with its RF connector and fit together then tighten the connector Caution Take care not to over tighten the RF connector The connector nut should be tightened to a nominal torque of no more than 15 N m 11 06 lb ft Using either 22mm or 7 8 open end torque wrench Figure 19 Align and fit filter to connector 10 Next tighten the four 4 screws...

Page 38: ...than 15 N m 11 06 lb ft Using either 22mm or 7 8 open end torque wrench Figure 21 Align and fit second filter to connector 12 Tighten the four 4 screws which fasten the second filter to the filter bridge 13 Tighten the four 4 screws which fasten the filter bridge to the Sun Shield Airspan recommends weather proofing the RF connections Note Weather proofing of all the connections is recommended Thi...

Page 39: ... filters cover in place Figure 23 Tighten screws on cover Note The changing or replacing of the external filter sets will require a dismantling of the AirHarmony 4400 from its mounting position to perform this change or replacement 4 3 Connecting the GPS Antenna After assembly of the External Filters set the GPS antenna should be connected and it is recommended that the connection should be weathe...

Page 40: ... the plug attached to the top panel on the AirHarmony 4400 Figure 24 Attaching GPS antenna to unit Caution Take care not to over tighten so as not to damage the threads Note It is good practice to weather proof all the antenna connections This is done with a layer of self amalgamating tape followed by an over layer of PVC tape The weather proofing the GPS connection is best done at this stage to g...

Page 41: ...ollowing images show the pole mount assembly on a wooden pole Caution Take care to install the Pole Wall mounting plate in the correct orientation Verify that the mounting pins are facing upwards as shown below Figure 25 Pole Wall mounting plate 1 Select the location on the pole to mount the AirHarmony 4400 You can attach the AirHarmony 4400 to any pole from 1 7 8 to 16 inches 47 6 to 406 4 mm in ...

Page 42: ...16 threaded rod through the drilled hole in the pole 6 Install on the exposed thread that protrudes from pole a flat washer split washer and then a 3 8 16 hex nut and tighten 7 Insert the clamp bands by passing them through the slots in the mounting plate in three 3 places Note The clamp bands are not supplied by Airspan and are the responsibility of the installer Clamp bands should not be wider t...

Page 43: ...plate is installed and ready for AirHarmony 4400 mounting 4 4 2 Mounting on a Non Wooden Pole The following images show the pole mount assembly on a non wooden pole Caution Take care to install the Pole Wall mounting plate in the correct orientation Verify that the mounting pins are facing upwards as shown below Figure 28 Pole Wall mounting plate w o bolt ...

Page 44: ...by Airspan and are the responsibility of the installer Clamp bands should not be wider than 15 5 mm in order to fit in the slots on the mounting plate 4 Tighten the clamp bands with large flat screwdriver Figure 29 Mounting plate mounted 4 4 3 Mounting on a Wall The following images show the wall mount assembly Caution Take care to install the Pole Wall mounting plate in the correct orientation Ve...

Page 45: ...Attach the mounting plate to the wall using Lag bolts x8 recommended Note Lag bolts x8 and necessary hardware are not supplied by Airspan and are the responsibility of the installer Recommended minimum 5 16 x 4 dia 8mm x 100mm with appropriate plugs according to field conditions Figure 30 Mounting Plate on Wall ...

Page 46: ...al rigging and hoisting practices should be followed when installing the AirHarmony 4400 on pole or wall To mount AirHarmony 4400 to the mounting plate perform the following 1 Lift up the AirHarmony 4400 unit and hook the slotted holes onto the mounting pins studs on the top of the mounting plate Figure 31 Lift unit and fit the slotted holes unto studs on top of mounting plate ...

Page 47: ...oles are aligned with the six 6 M8 clinch nuts on the mounting plate There are two 2 on the top near the mounting pins and two 2 on either side of the mounting plate for a total of six 6 3 Once aligned insert the supplied M8x20 Hex head bolt with a split washer and a flat washer into each clinch nut 4 Check and tighten all six 6 M8x20 Hex head bolts The following displays the AirHarmony 4400 mount...

Page 48: ...4400 External Cavity Filters Installation Guide UGD D01186 Airspan Commercial and Internal Use 42 The following displays the AirHarmony 4400 mounted on a concrete pole Figure 34 AirHarmony mounted on Concrete Pole ...

Page 49: ...y 4400 External Cavity Filters Installation Guide UGD D01186 Airspan Commercial and Internal Use 43 The following displays the AirHarmony 4400 being mounted on a wall Figure 35 AirHarmony being mounted on a Wall ...

Page 50: ...r local standards 5 2 Remote Antenna Assembly The AirHarmony 4400 unit is be used with a remotely attached antenna For installation of a remotely mounted antenna follow the antenna manufacturer s instructions and connect the antenna to the AirHarmony 4400 external filter RF connectors female DIN 4 1 9 5 connector using the appropriate cables with a male DIN 4 1 9 5 connector Caution Take care not ...

Page 51: ...isconnecting antenna 2 Weather proof the RF connections Note The above is also applicable for replacement assembly 5 2 2 Weather proofing the Antenna Connections Weather proofing of all the connections is required This is done with a layer of self amalgamating tape followed by an over layer of PVC tape The weather proofing is best done at this stage to give easier access to the connections Note We...

Page 52: ...hanced CAT5e cable used by Airspan products The Ethernet cable is connected using a standard RJ45 connector protected by a harsh environment protective casing Assembly Instructions The Copper Ethernet cable is connected to the AirHarmony 1000 using a Gland connector assembled on the bottom panel of the unit as shown below Figure 38 Gland connector copper 1 Remove the Gland connector by unscrewing ...

Page 53: ...he optical connection enables a one hand installation of the connector This enables the users to easily remove and replace the SFP transceiver module which eliminates the need to open the unit and expose its contents to hazardous weather conditions use only SFP which are safety approved IEC 60825 and CDRH with class 1 laser Note Airspan recommends using the Finisar FTLF1318P3BTL 1000BASE LX which ...

Page 54: ...r 5 Slide the inner housing and ground shield if present over the cable and over the molding Figure 42 Slide on inner housing Note Check that there no space between the inner housing and mounting flange Check and remove any debris that might interfere with the connection 6 Slide the outer shell over the inner housing and turn the outer bayonet shell 1 4 turn clockwise until it clicks into place ...

Page 55: ...tem is powered on do not touch the power terminals 5 5 1 Power Cable Preparation Tip It is good practice to label both ends of the cable to identify which AirHarmony 4400 unit it is connected to Tip It is good practice to leave a spare loop of cable approximately 0 5m This will allow for easier wiring and will allow the cable to be re terminated if necessary in the future Warning Required circuit ...

Page 56: ...green insulated wires to a length of 3 cm 1 18 in Then strip back 6 mm 0 24 in of the inner core insulation Figure 46 Strip wire 3 Thread the 3 wire stranded 18AWG cable through the tail nut gland seal body and rubber gasket of the connector casing as shown below Do not tighten the tail nut Figure 47 power cable assembly 4 Insert the stripped wire ends of the cable into the connector sleeves Figur...

Page 57: ...ase 3 Green Ground Figure 51 Attaching wires 6 Insert into connector the by alignment pin determines the correct orientation 7 Tighten the tail nut on to the body forcing the seal to compress around the power cable Caution Do not over tighten the connector or the tail nut The nut should be tightened to a torque of no more than 3 3 Nm 2 43 lb ft max Note When securing the cable verify there is no t...

Page 58: ...over the connector housing prior to connecting Figure 52 Connector Clamp 10 Tighten the assembled power cable to the connector Caution The internal plastic parts of the mating connector are keyed Take care to align these by visual inspection or by gently rotating the connector body until the key way sections align and the pins engaged fully before tightening Figure 53 Power cable attached to AirHa...

Page 59: ... with the Connector clamp after connection This is to prevent manually disconnecting the power cable After the power cable is connected securing the connection is required 1 This is performed by inserting the 2 M4 x 12 screws into the provided holes and tightening the screws The clamp covers the connector and prevents access to the connection so it cannot be opened without difficulty Figure 54 Sec...

Page 60: ...mming details known Point of connection for Ethernet if applicable All equipment items available at the installation site Main AirHarmony 4400 unit External Filter Set verify required set GPS Antenna Mounting bracket through bolt and pole clamps or bolts if wall mount Copper Ethernet or SFP cable assembly Weather proofing of the connections with a layer of self amalgamating tape followed by an ove...

Page 61: ...olved UMTS Terrestrial Radio Access Network is the air interface of 3GPP s Long Term Evolution EVM RCE The Error Vector Magnitude or EVM sometimes also called Receive Constellation Error or RCE is a measure used to quantify the performance of a digital radio transmitter or receiver It is measured in dB or percentage the lower the better FDD Frequency Division Duplexing A transceiver mode where the...

Page 62: ...ng etc ROHS Restriction Of Hazardous Substances RRM Radio Resource Management is used to cover all functions that are related to the assignment and sharing of radio resources among UEs S GW Serving Gateway A Core entity in the LTE EPC architecture responsible for routing and forwarding user data packets while also acting as the mobility anchor for the user plane during inter eNodeB handovers and a...

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