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Zte ZXSDR R8854, Hardware Installation

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Zte ZXSDR R8854 Hardware Installation Download Page 31

Chapter 4 RRU Installation

Name

External View

RRU support

Steps

Fixing the Pole Mount Assembly

1.

Insert an M10 screw through the installation hole on the one side of the fixing clip, and

install the plat washer, spring washer, and nut on the other side of the hole, see

Figure

4-16

.

Figure 4-16 Assembling the Pole Mount Assembly

1.

Screw

2.

Fixing clip

3.

Installation bracket

4.

Flat washer

5.

Spring washer

6.

Nut

2.

Assemble the pole component to the pole through the U-shape open side of the

installation bracket, and then install the screw into the U-shape slot, see

Figure 4-17

.

4-13

SJ-20160405141455-003|2018-01-03 (R1.3)

ZTE Proprietary and Confidential

Summary of Contents for ZXSDR R8854

Page 1: ... Radio Remote Unit Hardware Installation Version 1 0 ZTE CORPORATION No 55 Hi tech Road South ShenZhen P R China Postcode 518057 Tel 86 755 26771900 Fax 86 755 26770801 URL http support zte com cn E mail 800 zte com cn ...

Page 2: ...provided in any written license between ZTE CORPORATION and its licensee the user of this document shall not acquire any license to the subject matter herein ZTE CORPORATION reserves the right to upgrade or make technical change to this product without further notice Users may visit the ZTE technical support website http support zte com cn to inquire for related information The ultimate right to i...

Page 3: ... Installing an RRU on a Gantry 4 27 4 6 Installing an RRU on a L shape Support 4 32 Chapter 5 Cable Installation 5 1 5 1 Installing the Protective Grounding Cable 5 3 5 2 Installing Antenna Feeder Cables 5 5 5 3 Installing a Monitoring Cable 5 7 5 4 Installing the AISG Cable 5 8 5 5 Installing the DC Power Input Cable 5 10 5 6 Installing an Optical Fiber Cable 5 15 5 7 Unused Interface Protection ...

Page 4: ...Figures I Tables V Glossary VII II SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 5: ...stallation Check Describes how to inspect hardware installation Chapter 7 Power on Inspection Describes how to inspect the operation of the ZXSDR R8854 after the ZXSDR R8854 is powered on Chapter 8 Closure Describes the operations that need to be implemented after all hardware components are installed Chapter 9 Installing the DC Junction Box Describes how to install the DC junction box Chapter 10 ...

Page 6: ...ll result in death or serious personal injury Warning indicates a potentially hazardous situation Failure to comply can result in death or serious personal injury Caution indicates a potentially hazardous situation Failure to comply can result in moderate or minor personal injury Notice indicates equipment or environment safety information Failure to comply can result in equipment damage data loss...

Page 7: ...hapter 1 Installation Flow For the installation flow of the ZXSDR R8854 see Figure 1 1 Figure 1 1 ZXSDR R8854 Installation Flow 1 1 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 8: ...ZXSDR R8854 Hardware Installation This page intentionally left blank 1 2 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 9: ... container to protect the device from scratches l After the packing container is removed on site the device must be protected when you move or store it For example when a device is stored temporarily cushioning materials must be put under the bottom of the device to avoid direct contact with the ground and surrounding objects l When you transport a device cushioning materials such as foamed plasti...

Page 10: ...3 Hoisting rope Caution Installer A on the tower cannot loosen the fixed rope until he confirms that the device is securely placed on the tower platform 2 Installer C on the ground binds the RRU tightly see Figure 2 2 2 2 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 11: ...ope between the grounding point and the protection block at the bottom of the RRU ensuring that the RRU is bundled firmly 3 Installer B on the ground drags the hoisting rope downwards At the same time installer C pulls the hauling rope out wards to protect the device from colliding with the tower when the device reaches the mounting platform see Figure 2 1 4 Lift the properly packed engineering ma...

Page 12: ...ions 1 Do not open the equipment s airtight part see Figure 2 3 Figure 2 3 Do Not Open the Airtight Part 2 The RRU box has a layer of rustproof paint that protects it from being scratched during transportation and installation 3 Do not install any port upwards see Figure 2 4 2 4 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 13: ...r 2 Installation Preparations Figure 2 4 Do Not Install Any Port Upwards 4 Do not use the horizontal installation mode see Figure 2 5 2 5 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 14: ...on for waiting for the cooldown should be determined through testing 2 4 Instruments and Meters List Table 2 1 lists the instruments and meters required for installing the ZXSDR R8854 Table 2 1 Instruments and Meters List Item List Measuring and ruling instruments 5 m steel tape 1 m ruler gradienter marker drilling template Drilling instruments Electric percussion drill auxiliary drill bits and va...

Page 15: ...ers Digital multimeter VSWR tester earth resistance tester base station tester compass field strength tester for special purpose and spectrum analyzer for special purpose 2 5 Installation Space Requirement Figure 2 6 shows the recommended space for installing ZXSDR R8854 Figure 2 6 Recommended Space for Installing ZXSDR R8854 in mm Figure 2 7 shows the minimum space for installing ZXSDR R8854 2 7 ...

Page 16: ...ZXSDR R8854 Hardware Installation Figure 2 7 Minimum Space for Installing ZXSDR R8854 in mm 2 8 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 17: ... or stains l Verify that the accessories required for the installation are correct and complete Equipment Handover After the examination of goods the engineering supervisor and the operator s representative should sign the Unpacking Acceptance Report The Unpacking Acceptance Report is made in duplicate and kept by both parties The engineering supervisor must send the Unpacking Acceptance Report ba...

Page 18: ...ZXSDR R8854 Hardware Installation This page intentionally left blank 3 2 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 19: ...stalled in the following ways l Wall mounted installation see Figure 4 1 Figure 4 1 Wall Mounted Installation l Pole mounted installation see Figure 4 2 Figure 4 3 and Figure 4 4 4 1 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 20: ...R R8854 Hardware Installation Figure 4 2 Pole Mounted Installation of a Single RRU Figure 4 3 Pole Mounted Installation of Two RRUs 4 2 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 21: ...hapter 4 RRU Installation Figure 4 4 Pole Hoop Mounted Installation of a Single RRU l Gantry mounted installation see Figure 4 5 4 3 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 22: ...ZXSDR R8854 Hardware Installation Figure 4 5 Gantry Mounted Installation l L shape support installation see Figure 4 6 4 4 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 23: ... Installing an RRU on a Gantry 4 27 Installing an RRU on a L shape Support 4 32 4 1 Installing an RRU on a Wall An RRU can be installed on a wall when used indoors outdoors or in a high speed rail scenario This procedure describes how to install the ZXSDR R8854 on a wall Context For a description of the accessories used for installing an RRU on a wall refer to Table 4 1 4 5 SJ 20160405141455 003 2...

Page 24: ...llation Name External View Fixing clamp RRU support Steps Drilling a Hole 1 Mark the hole positions on the wall with a drilling template see Figure 4 7 Figure 4 7 Installation Positions of Expansion Bolts 4 6 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 25: ...ove dust with a vacuum cleaner during drilling Installing an Expansion Bolt 3 Install an expansion bolt see Figure 4 9 Figure 4 8 shows an external view of an expansion bolt Figure 4 8 External View of an Expansion Bolt 1 Nut 2 Spring washer 3 Flat washer 4 Bolt 5 Expansion tube 4 7 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 26: ...aging the thread during hammering c Hammer the expansion bolt into the installation hole with a claw hammer d Fasten the nut near the expansion tube clockwise to allow the expansion bolt to fully expand e Loosen the nut counterclockwise and remove the nut spring washer and flat washer in turn for use during subsequent installation Installing the Fixing Clamp 4 Secure the fixing clamp to the wall w...

Page 27: ...Flat washer Note The yellow arrow on the fixing clamp should point upwards during installation Securing the RRU 5 Fix the RRU support to the back of the RRU with four M6 screws with a torque of 8 N m see Figure 4 11 4 9 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 28: ...e RRU support to the fixing clamp see Figure 4 12 Figure 4 12 Installing the RRU Support to the Fixing Clamp 7 Tighten the captive screw on the top of the RRU support with an M6 Allen hex wrench see Figure 4 13 4 10 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 29: ...20 mm a channel steel pole φ60 100 mm or an angle steel pole φ63 100 mm The following description and procedure are based on round pole mounted installation Figure 4 14 and Figure 4 15 show channel steel pole mounted installation and angle steel pole mounted installation respectively 4 11 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 30: ...nstallation Context For a description of the accessories used for installing a single RRU on a pole refer to Table 4 2 Table 4 2 Accessories for Single RRU Pole Mounted Installation Name External View Pole component pole mounted mode of a single RRU 4 12 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 31: ...r and nut on the other side of the hole see Figure 4 16 Figure 4 16 Assembling the Pole Mount Assembly 1 Screw 2 Fixing clip 3 Installation bracket 4 Flat washer 5 Spring washer 6 Nut 2 Assemble the pole component to the pole through the U shape open side of the installation bracket and then install the screw into the U shape slot see Figure 4 17 4 13 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Prop...

Page 32: ...installing the fixing clip ensure that the yellow arrow of the fixing clip is upward 3 Tighten the nuts on both sides of the pole component with an adjustable wrench to fix the pole component on the pole see Figure 4 18 4 14 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 33: ...embly 2 Installing the RRU Support 4 Fix the RRU support to the back of the RRU with four M6 screws with a torque of 8 N m see Figure 4 19 Figure 4 19 Installing the RRU Support Securing the RRU 4 15 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 34: ...ip see Figure 4 20 Figure 4 20 Installing the RRU on the Pole Mount Assembly 6 Tighten the captive screw on the RRU support with an M6 inner hexagon wrench to fix the ZXSDR R8854 see Figure 4 21 Figure 4 21 Securing the RRU End of Steps 4 16 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 35: ...lling two RRUs on a pole refer to Table 4 3 Table 4 3 Accessories for Two RRU Pole Mounted Installation Name External View Pole component pole mounted mode of two RRUs RRU support Steps Fixing the Pole Mount Assembly 1 Insert an M10 screw through the installation hole on the one side of the fixing clip and install the plat washer spring washer and nut on the other side of the hole see Figure 4 22 ...

Page 36: ...to the pole and install the screw on the other side of the fixing clip see Figure 4 23 Figure 4 23 Installing the Pole Component 1 3 Tighten the nuts on both sides of the pole component with an adjustable wrench with a torque of 40 N m to fix the pole component on the pole see Figure 4 24 4 18 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 37: ...s and ensure that the exposed lengths of the screws on both sides of the fixing clip are the same Otherwise RRU installation may be affected Installing the RRU Support 4 Fix the RRU support to the back of the RRU with four M6 screws with a torque of 8 N m see Figure 4 25 4 19 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 38: ...25 Installing the RRU Support Securing the RRUs 5 Install the two RRUs on the pole mount assembly along the guide rails on the fixing clamps respectively see Figure 4 26 4 20 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 39: ...nstalling the RRUs on the Pole Mount Assembly 6 Tighten the captive screws on the top of all the RRU supports with an M6 Allen hex wrench respectively see Figure 4 27 4 21 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 40: ...e This procedure describes how to install the ZXSDR R8854 through pole hoops This installation mode is applicable to the pole with the diameter of 120 mm 380 mm Context For the required installation accessories of pole hoop mounted mode refer to Table 4 4 4 22 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 41: ...nted Installation Mode of a Single RRU Accessory Overview Fixing clip Pole hoop ZXSDR R8854 support Steps 1 Install the RRU support to the rear panel of the ZXSDR R8854 with four M6 screws see Figure 4 28 4 23 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 42: ...talling the RRU Support 2 Install the fixing clip to the pole see Figure 4 29 a Install pole hoops to the fixing clip b Fix the fixing clip on the pole through the pole hoops 4 24 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 43: ...Chapter 4 RRU Installation c Tighten the screws on the pole hoops 4 25 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 44: ...alling the Fixing Clip to the Pole 3 Mount the ZXSDR R8854 to the fixing clip on the pole along the rail of the fixing clip see Figure 4 30 Figure 4 30 Mounting the ZXSDR R8854 4 26 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 45: ...igure 4 31 Figure 4 31 Tightening the Captive Screw End of Steps 4 5 Installing an RRU on a Gantry This procedure describes how to install an RRU on a gantry Context For a description of the accessories used for installing an RRU on a gantry refer to Table 4 5 4 27 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 46: ...8854 Hardware Installation Table 4 5 Accessories for Gantry Mounted Installation Name External View Gantry Fixing clamp Adapter plate 4 28 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 47: ...with a torque of 20 N m see Figure 4 32 Figure 4 32 Installing the Adapter Plate 1 Bolt 2 Adapter plate 3 Flat washer 4 Spring washer 5 Nut 2 Secure the fixing clamp to the adapter plate with four M10 bolts and nuts with a torque of 40 N m see Figure 4 33 4 29 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 48: ...allation Figure 4 33 Securing the Fixing Clamp 3 Fix the RRU support to the back of the RRU with four M6 screws with a torque of 8 N m see Figure 4 34 4 30 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 49: ...RU on the gantry along the guide rail of the fixing clamp and tighten the captive screw on the top of the RRU support with an M6 Allen hex wrench see Figure 4 35 Figure 4 35 Installing the RRU on the Gantry 4 31 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 50: ...a L shape Support This procedure describes how to install an RRU on a L shape support Context For a description of the accessories used for installing an RRU on a L shape support refer to Table 4 6 4 32 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 51: ...4 RRU Installation Table 4 6 Accessories for L shape Support Installation Name External View L shape support Fixing clamp RRU support 4 33 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 52: ... with four M10 bolts and nuts with a torque of 40 N m see Figure 4 36 Figure 4 36 Securing the Fixing Clamp 2 Fix the RRU support to the back of the RRU with four M6 screws with a torque of 8 N m see Figure 4 37 4 34 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 53: ... L shape support along the guide rail of the fixing clamp and tighten the captive screw on the top of the RRU support with an M6 Allen hex wrench see Figure 4 38 Figure 4 38 Installing the RRU on the L shape Support 4 35 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 54: ...ZXSDR R8854 Hardware Installation End of Steps 4 36 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 55: ...n site Used to connect DCPD made on site External View Connector Type DLC LC DLC FC 2 LC SC Interconnected Port RRU BBU Cable s RRU end connected to the OPT1 Cable s BBU end connected to the BBU External View Connector Type DLC LC DLC LC Optical Cable Interconnected Port RRU RRU The OPT2 port of the upper layer RRU The OPT1 port of the lower layer RRU External View Connector Type DIN type male con...

Page 56: ...r AISG Cable Interconnected Port Local AISG MON port of RRU RCU s AISG port of the tunable antenna External View Connector Type DB15 connector Naked cables MON Cable Interconnected Port Local AISG MON port of RRU External monitoring device Cable Connection Diagram 5 2 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 57: ...ing a Monitoring Cable 5 7 Installing the AISG Cable 5 8 Installing the DC Power Input Cable 5 10 Installing an Optical Fiber Cable 5 15 Unused Interface Protection 5 18 5 1 Installing the Protective Grounding Cable This procedure describes how to install the protective grounding cable The protective grounding cable is a copper core cable with a cross sectional area of 16 mm2 5 3 SJ 20160405141455...

Page 58: ...ee Figure 5 2 Figure 5 2 Connecting the Protective Grounding Cable to the Grounding Busbar Directly Note About 30 cm of the cable should droop freely before the cable is routed to the pole or cable tray 4 Remove the rust on the grounding busbar and crimp an OT terminal at the other end of the protective grounding cable 5 Connect the other end of the protective grounding cable to the grounding busb...

Page 59: ...station and the antenna is less than five meters A feeder jumper is used The distance between the base station and the antenna is greater than five meters and less than 20 meters A 1 2 feeder is used Steps 1 Optional Install a heat shrink sleeve on the feeder connector if a feeder connector needs to be made on site see Figure 5 3 Figure 5 3 Making a Feeder Connector Note If the distance between th...

Page 60: ... 5 Lay the antenna feeder cable on the antenna side and bind it with black cable ties The feeder should be laid vertically at least 200 mm from the lower edge of the device when it is led out from the bottom of the RRU chassis It should not be bent The minimum bending radius of the feeder should not be less than 20 times the feeder s radius It is prohibited to coil the feeder 5 6 SJ 20160405141455...

Page 61: ...DR R8854 Antenna Feeder Connection Diagram End of Steps 5 3 Installing a Monitoring Cable This procedure describes how to install a monitoring MON cable A monitoring cable is used to connect the dry contact interface of an external monitoring device Steps 1 Connect one end of the monitoring cable to the AISG MON interface at the bottom of the ZXSDR R8854 chassis see Figure 5 6 5 7 SJ 2016040514145...

Page 62: ... to the dry contact interface of the external monitoring device 3 Bundle and label the cable End of Steps 5 4 Installing the AISG Cable An AISG cable between the RF module and an RET antenna is used to transmit the signals to or from the RET antenna 5 8 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 63: ... cable to the AISG MON port on the ZXSDR R8854 see Figure 5 7 Figure 5 7 Installing the AISG Cable 2 Connect the other end to the AISG port on the RET antenna 3 Bundle and label the cable End of Steps 5 9 SJ 20160405141455 003 2018 01 03 R1 3 ZTE Proprietary and Confidential ...

Page 64: ...power cable to that with the section area of 4 mm2 or 6 mm2 For how to install the DC junction box ODCPD1 refer to Chapter 9 Installing the DC Junction Box Steps Open the maintenance window 1 Open the maintenance window at the side of the ZXSDR R8854 see Figure 5 8 Figure 5 8 Open the maintenance window Making the Power Cable Connector 2 Follow the maintenance window diagram to tailor the naked sh...

Page 65: ...rted and have a close contact with the inner bottom of the connector s plug Figure 5 10 Insert the crimped tubular terminal 1 Button 2 Pull tab insulator 3 Mandrill 4 Crimping tube 5 Shell Note Standard assembly requires that tubular terminals cannot be pushed forward any more 6 Press the red and blue buttons you may use tools like screwdriver but are not allowed to use heavy tools like hammer or ...

Page 66: ...lug into the power port inside the maintenance window see Figure 5 12 Push the plug forward unit you hear the sound of click If you shake the plug shell but it does not loosen or fall down you are not allowed to pull the plug s pull tab at this time it indicates that the plug is installed securely and locked closely Figure 5 12 Insert the power cable 5 12 SJ 20160405141455 003 2018 01 03 R1 3 ZTE ...

Page 67: ...band cabinet connected to the other end of the power cable see Figure 5 13 If Then The baseband cabinet is installed outdoors Connect the power cable to the outdoor grounding busbar through the grounding kit before the cable is led into the cable inlet hole of the outdoor cabinet The baseband cabinet is installed indoors Connect the power cable to the grounding busbar through the grounding kit bef...

Page 68: ...der window the grounding cable should be routed toward the feeder window along the downward direction of the power cable Connecting the Power cable of the Power Supply Equipment 12 Use a tubular terminal to make the connector of the AC power cable at the BBU side and then connect the AC power cable to the DC output port of the DCPD see Figure 5 14 Figure 5 14 Connecting the Power Cable to the DCPD...

Page 69: ...ocedure describes how to install an optical fiber cable Steps Installing Optical Fiber 1 Open the crimping clip at the left side of the maintenance window see Figure 5 15 Figure 5 15 Open the crimping clip 2 Remove the cable tie at one end of the corrugated pipe marked as RRU by using the diagonal pliers 3 Remove the white dust cap of the optical cable connector see Figure 5 16 Figure 5 16 Remove ...

Page 70: ... installed properly see Figure 5 17 Figure 5 17 Insert the optical cable Note In the case of cascaded connection with RRUs use an optical fiber for cascading connection to connect the OPT2 port of upper level RRU and the OPT1 port of lower level RRU 5 Secure the optical cable at the crimping clip in the wiring cavity see Figure 5 18 In the case of one optical cable install it to the outgoing slot ...

Page 71: ...the RRU chassis The optical fiber cable should not be bent The optical fiber cable is then fixed onto the pole or cable tray Coil the excess part of the optical fiber cable in a diameter of 300 mm to 400 mm and then bind the fiber coil to an appropriate position for example the wire spool on the BBU with black cable ties 7 Remove the cable tie at one end of the corrugated pipe marked as BBU by usi...

Page 72: ...rotect all unused interfaces on the ZXSDR R8854 Steps 1 Check an unused interface Check whether an unused interface is covered with a dustproof cap If not cover it with a dustproof cap 2 Waterproof a dustproof cap Wrap it with a black double layer ultraviolet proof tape the first layer from top down the second layer from bottom up according to the direction of tightening the interface Make sure th...

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