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8

Installing the device

WARNING!

Keep the tamper-proof seal on a mounting screw on the chassis cover intact, and if you want to open
the chassis, contact the local agent of H3C for permission. Otherwise, H3C shall not be liable for any
consequence caused thereby.

The installation method is similar for the T50X0 IPS series. This document uses a T5000-S as an
example. The device view varies by model. The following figures are for illustration only.

Installation flow

Table 8 Installation flow for the T50X0 IPS series

Step

Description

1.

Start

Before installation, make sure all requirements on the checklist
are met and the device is powered off.

2.

Grounding the device

Before installation, make sure the device and rack are reliably
grounded and you wear an ESD wrist strap.

Installing the device in a standard
19-inch rack

The device is heavy. Both mounting brackets and slide rails are
required to support the weight of the chassis.

4.

Installing a power supply

Before you install a power supply, make sure the power supply
is not connected to any power source and the grounding cable
of the device is connected reliably.

5.

Installing a fan tray

Install compatible fan trays on the device.

6.

Installing an interface module

No interface modules are provided with the device. Prepare
them yourself as required.

7.

Installing a drive

Install compatible drives on the device.

8.

Connecting Ethernet cables

The device provides various ports. Choose compatible
transceiver modules and cables as required. To avoid bodily
injury or device damage, read the restrictions and guidelines
carefully before connection.

9.

Connecting power cords

Connect compatible power cords to the power supplies.

10.

Verifying the installation

Verify that the device is installed securely and reliably
grounded, and that the power supplies are as required.

Grounding the device

CAUTION:

•

Correctly connecting the grounding cable is crucial to lightning protection and EMI protection.

•

Do not connect the grounding cable to a fire main or lightning rod.

The device provides a primary grounding point (above the power supplies) on the rear panel and an
auxiliary grounding point on the left side. The primary grounding point has a grounding sign and a
grounding screw while the auxiliary grounding point does not.

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Содержание SecPathT5000-C

Страница 1: ...H3C SecPathT5030 T5060 T5080 T5000 S T5000 C Intrusion Prevention System Installation Guide New H3C Technologies Co Ltd http www h3c com Document version 6W101 20220620 ...

Страница 2: ...respective owners Notice The information in this document is subject to change without notice All contents in this document including statements information and recommendations are believed to be accurate but they are presented without warranty of any kind express or implied H3C shall not be liable for technical or editorial errors or omissions contained herein Environmental protection This produc...

Страница 3: ... syntax choices keywords or arguments that are optional x y Braces enclose a set of required syntax choices separated by vertical bars from which you select one x y Square brackets enclose a set of optional syntax choices separated by vertical bars from which you select one or none x y Asterisk marked braces enclose a set of required syntax choices separated by vertical bars from which you select ...

Страница 4: ...as a Layer 2 or Layer 3 switch or a router that supports Layer 2 forwarding and other Layer 2 features Represents an access controller a unified wired WLAN module or the access controller engine on a unified wired WLAN switch Represents an access point Represents a wireless terminator unit Represents a wireless terminator Represents a mesh access point Represents omnidirectional signals Represents...

Страница 5: ...Documentation feedback You can e mail your comments about product documentation to info h3c com We appreciate your comments ...

Страница 6: ...g Ethernet cables 15 Connecting a copper Ethernet port 15 Connecting a fiber port 16 Connecting power cords 18 Connecting an AC power cord 18 Connecting a DC power cord 18 Verifying the installation 19 Accessing the device for the first time 20 Setting up the configuration environment 20 Powering on the device 20 Checking before power on 20 Powering on the device 20 Checking after power on 20 Logg...

Страница 7: ...tware loading failure 37 Appendix A Chassis views and technical specifications 38 Chassis views 38 Front panel 38 Rear panel 38 Expansion slots 39 Interface modules 39 Compatible slots for interface modules 39 NSQM1TG8A 39 NSQM1QG2A 40 NSQM1G4XS4 40 NSQM1GT8A 40 NSQM1GP8A 41 NSQM1GT4PFCA 41 Power supplies 41 PSR650B 12A1 AC power supply 42 PSR650B 12D1 DC power supply 42 Fan trays 43 FAN 20F 2 A 4...

Страница 8: ...ition is flat vibration free and away from electromagnetic interferences ESD and anti slip measures are in place Do not place the device on an unstable case or desk The device might be severely damaged in case of a fall Keep the chassis and installation tools away from walk areas Keep the chassis clean and dust free Do not place the device near water or in a damp environment Prevent water or moist...

Страница 9: ... dust plug into any open fiber port or transceiver module port to protect them from contamination and ESD damage Moving safety When you move the device follow these guidelines To avoid damage move and unpack the device with care After you move the device from a location below 0 C 32 F to the equipment room follow these guidelines to prevent condensation Wait a minimum of 30 minutes before unpackin...

Страница 10: ...aging of insulation materials and significantly lower the reliability and lifespan of the device Table 2 Temperature humidity requirements Temperature Relative humidity Operating Without drives 0 C to 45 C 32 F to 113 F With drives 5 C to 40 C 41 F to 104 F Storage 40 C to 70 C 40 F to 158 F Operating Without drives 5 RH to 95 RH noncondensing With drives 10 RH to 90 RH noncondensing Storage 5 RH ...

Страница 11: ...ing different fan trays it provides front to rear or rear to front airflow to adapt to different installation environments The following fan trays are available for the device FAN 20F 2 A fan tray It provides power supply side intake and port side exhaust airflows as shown in Figure 1 The fan tray has a blue fan tray handle FAN 20B 2 A fan tray It provides port side intake and power supply side ex...

Страница 12: ...acle with protection earth PE to filter interference from the power grid Keep the device far away from radio transmitting stations radar stations and high frequency devices Use electromagnetic shielding for example shielded interface cables when necessary To prevent signal ports from getting damaged by overvoltage or overcurrent caused by lightning strikes route interface cables only indoors If pa...

Страница 13: ...stallation tools No installation tools are provided with the device Prepare installation tools yourself as required Table 5 Installation tools Flathead screwdriver Phillips screwdriver Needle nose pliers Marker Diagonal pliers ESD wrist strap Wire stripping pliers Crimping tool Installation accessories Table 6 Installation accessories M6 rack screw M4 mounting bracket screw Cage nut Grounding cabl...

Страница 14: ...ng stations radar stations and high frequency devices Electromagnetic shielding for example shielded interface cables is used as required Lightning protection The device is reliably grounded The AC power source is reliably grounded Optional Network signal lightning arresters are available Optional A power lightning arrester is available Power supply A UPS is available The power off switch in the e...

Страница 15: ...nected to any power source and the grounding cable of the device is connected reliably 5 Installing a fan tray Install compatible fan trays on the device 6 Installing an interface module No interface modules are provided with the device Prepare them yourself as required 7 Installing a drive Install compatible drives on the device 8 Connecting Ethernet cables The device provides various ports Choos...

Страница 16: ... a standard 19 inch rack WARNING To avoid bodily injury and device damage a minimum of two persons are required to install the device CAUTION Ensure a clearance of 1 RU 44 45 mm or 1 75 in between the device and walls or other devices for heat dissipation The mounting brackets and chassis rails are required to support the weight of the chassis To mount the device in a rack make sure the rack meets...

Страница 17: ...ed on each rear rack post 4 Install cages nuts at the marked installation positions 5 Use M6 screws to attach the slide rails to the rear rack posts Figure 4 Installing cage nuts and slide rails 6 Use the provided M4 screws to attach the mounting brackets and chassis rails to both sides of the device The device provides multiple installation positions for chassis rails Attach chassis rails to the ...

Страница 18: ...k posts Figure 6 Mounting the device in the rack Installing a power supply CAUTION Before installing a power supply make sure the power is disconnected and the device is reliably grounded Install a filler panel over an empty power supply slot to prevent dust and ensure good ventilation in the chassis Do not install AC and DC power supplies on the same device No power supplies are provided with the...

Страница 19: ...R2 empty Figure 7 Removing the filler panel 2 Install the power supply a Orient the power supply with the retaining latch on the right side b Holding the handle of the power supply with one hand and supporting the module bottom with the other push the power supply into the slot along the guide rails until it is securely seated in the slot Figure 8 Installing an AC power supply ...

Страница 20: ...then insert it again If one fan tray fails during the device operation replace the fan tray immediately and keep the fan tray in the slot before the replacement If both fan trays fail replace one fan tray first immediately Replace the other fan tray after the new fan tray operates correctly Do not remove the two fan trays at the same time or the device will be powered off The device supports the F...

Страница 21: ...s required To install an interface module 1 Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded 2 Remove the screws on the filler panel with a Phillips screwdriver and remove the filler panel Keep the filler panel for future use 3 Open the ejector levers on the module and slide the module steadily into the slot along the guide rails 4 Close the ejector levers ...

Страница 22: ... is reliably grounded 2 Remove the filler panel from the drive slot 3 Press the red button on the drive panel to release the locking lever 4 Hold the locking lever slide the drive into the slot along the guide rails and then close the locking lever Figure 11 Installing a drive Connecting Ethernet cables Connecting a copper Ethernet port You can use either a straight through or a cross over network...

Страница 23: ...e might be damaged Before installing a transceiver module in a fiber port remove the optical fibers if any from the transceiver module To connect a fiber port by using an optical fiber first install a transceiver module in the port and then connect the optical fiber to the transceiver module Insert a dust cap into any open optical fiber connector and a dust plug into any open fiber port or transce...

Страница 24: ...s two sides and push the end without the bail latch gently into the port until it snaps into place 3 Remove the dust cap from the optical fiber connector and use dust free paper and absolute alcohol to clean the end face of the fiber connector 4 Identify the Rx and Tx ports on the transceiver module Use the optical fiber to connect the Rx port and Tx port on the transceiver module to the Tx port a...

Страница 25: ... Use a removable cable tie to secure the AC power cord to the power supply handle 3 Connect the other end of the power cord to an AC power source Figure 16 Connecting an AC power cord Connecting a DC power cord 1 Correctly orient the DC power cord plug with the power receptacle on the power supply and insert the plug into the receptacle 2 Use a removable cable tie to secure the DC power cord to th...

Страница 26: ...tallation There is enough space around the device for heat dissipation The device and its components are installed securely The screws are fastened tightly The power source specifications are as required by the device The grounding cable console cable power cords and interface cables are connected correctly 1 2 4 3 ...

Страница 27: ...and grounding cable are correctly connected The correct power source is used The console cable is correctly connected the terminal or PC used for configuration has started and the configuration parameters have been correctly set The interface modules if any are correctly installed Powering on the device Switch on the power source of the device Checking after power on After powering on the device v...

Страница 28: ...cess the EXTENDED BOOTWARE menu press Ctrl B immediately when the Press Ctrl B to access EXTENDED BOOTWARE MENU message displays If you do not press Ctrl B at the prompt the system starts to read and decompress program files To enter the EXTENDED BOOT menu afterwards you need to reboot the device Logging in to the device To access the device for the first time you can log in to the device from the...

Страница 29: ...Password admin IP address of GigabitEthernet 1 0 0 192 168 0 1 24 To log in to the device from the Web interface by using the default account 1 Use an Ethernet cable to connect a PC to Ethernet management port GigabitEthernet 1 0 0 on the device 2 Configure an IP address in subnet 192 168 0 0 24 for the PC Make sure the PC and the device are reachable to reach other The PC must use a different IP ...

Страница 30: ...23 4 Run the Telnet client on the PC and enter the login information ...

Страница 31: ...n if they are not rotating The fan trays are hot swappable To replace a fan tray 1 Holding the fan tray handle with one hand and supporting the fan tray bottom with the other pull the fan tray out of the slot along the guide rails 2 Put the removed fan tray into an antistatic bag 3 Install a new fan tray For the installation procedure see Installing a fan tray Figure 18 Removing a fan tray Replaci...

Страница 32: ...Replacing an interface module CAUTION Do not hot swap interface modules Power off the device before replacing an interface module If you are not to install a new interface module after removing the old one install a filler panel in the slot to prevent dust and ensure good ventilation The replacement procedure is the same for the interface modules This following procedure replaces an NSQM1GP8A inte...

Страница 33: ...drive CAUTION To avoid storage medium damage execute the umount command from the CLI to unmount all partitions before removing a drive Do not hot swap drives To replace a drive 1 Log in to the Web interface Click the Unmount button on the Storage settings page 2 Wear an ESD wrist strap and make sure it makes good skin contact and is reliably grounded 3 Press the button on the drive panel to releas...

Страница 34: ...he new transceiver module and the transceiver module at the other end of the optical fiber have the same specifications Figure 23 Golden plating To replace a transceiver module 1 Use the shutdown command in interface view at the CLI to shut down the port 2 Remove the LC connectors of the optical fiber from the transceiver module Install dust caps for the LC connectors to prevent contamination and ...

Страница 35: ...Removing a transceiver module 4 Install dust caps for the removed transceiver module and then put it into the package 5 Install a new transceiver module For the installation procedure see Connecting a fiber port 2 1 ...

Страница 36: ...Ver 1 0 CPLD_A 1 0 CPLD_B 1 0 CFCard Num 0 Displaying software and hardware version information for the device Use the display version command to display software and hardware version information for the device Sysname display version H3C Comware Software Version 7 1 064 Test XXXX Copyright c 2004 2017 New H3C Technologies Co Ltd All rights reserved H3C SecPath T5000 S uptime is 0 weeks 2 days 21 ...

Страница 37: ...n for the device Sysname display device manuinfo Slot 1 CPU 0 DEVICE_NAME Secpath T5000 S DEVICE_SERIAL_NUMBER 210235A3KXH17A000022 MAC_ADDRESS 74EA C8C5 8EEB MANUFACTURING_DATE 2017 11 08 VENDOR_NAME H3C Table 10 Output description Field Description DEVICE_NAME Device name DEVICE_SERIAL_NUMBER Device serial number MAC_ADDRESS MAC address of the device MANUFACTURING_DATE Manufacturing date of the ...

Страница 38: ...uffers Cached FreeRatio Mem 16413016 5065956 11347060 0 2380 166656 69 2 Buffers Cache 4896920 11516096 Swap 0 0 0 Table 12 Output description Field Description Slot Slot number of the interface module Mem Memory usage information Total Total size of the physical memory space that can be allocated The memory space is virtually divided into two parts Part 1 is used for kernel codes kernel managemen...

Страница 39: ...ironment command to display the temperature information for the device Sysname display environment System Temperature information degree centigrade Slot Sensor Temperature LowerLimit Warning UpperLimit Alarm UpperLimit Shutdown UpperLimit 1 inflow 1 36 0 60 70 NA 1 inflow 2 34 0 60 70 NA 1 outflow 1 42 0 60 70 NA 1 hotspot 1 62 0 80 92 NA Table 14 Output description Field Description Slot Slot num...

Страница 40: ...rection Speed Fan tray speed The fan tray adjusts its speed automatically to adapt to the device temperature The inflow and outflow temperature sensors monitor the device temperature To view device temperature information execute the display environment command Displaying the operational statistics about the device When you perform routine maintenance or the system fails you might need to view the...

Страница 41: ...modules The system outputs alarm information for you to locate and troubleshoot faults of transceiver modules To display the alarm information about transceiver modules execute the display transceiver alarm interface interface type interface number command Rebooting the device CAUTION If the main system software image file does not exist do not use the reboot command to reboot the device Specify t...

Страница 42: ...e in user view To schedule a reboot Task Command Remarks Schedule a reboot to occur at a specific time or date scheduler reboot at Use either command By default no reboot date or time or reboot delay time is specified Available in user view Schedule a reboot to occur after a delay scheduler reboot delay ...

Страница 43: ...lution To resolve the issue 1 Verify that the power supply system is operating correctly 2 Verify that the console cable is correctly connected 3 Verify that the console cable is connected to the serial port that is configured for the configuration terminal 4 Verify that the configuration terminal parameters are configured as follows Baud rate 9600 Data bits 8 Parity None Stop bits 1 Flow control ...

Страница 44: ...sales agent NOTE Information about the device temperature in the display environment command output varies by device model Software loading failure Symptom Software loading fails and the system runs the software of the previous version Solution To resolve the issue 1 Verify that the physical ports are correctly connected If a port is not connected securely reconnect the port and make sure the conn...

Страница 45: ...le slots 1 through 8 2 Drive slot HD0 3 Drive slot HD1 4 LEDs Rear panel On the rear panel the device provides the following ports and slots Four combo interfaces including one management Ethernet port Two USB ports One console port Two fan tray slots Two power supply slots Figure 26 Rear view 1 10 100 1000BASE T copper port combo interface 2 1000BASE X fiber port combo interface 2 4 1 3 1 2 3 4 5...

Страница 46: ...odule install the interface module in slot 3 By default autonegotiation is disabled on GE fiber ports of an NSQM1G4XS4 interface module If you have to switch the port transmission speed or duplex mode because the autonegotiation mode is inconsistent with that on the peer device install the NSQM1G4XS4 interface module in slot 3 Compatible slots for interface modules Table 17 Compatible slots for in...

Страница 47: ... 2 40GBASE R fiber ports 3 Captive screw 4 Ejector lever NSQM1G4XS4 The NSQM1G4XS4 interface module provides four 10GBASE R fiber ports 10G SR LR and four 1000BASE X fiber ports Figure 29 NSQM1G4XS4 front view 1 LED 2 1000BASE X fiber ports 3 10GBASE R fiber ports 4 Captive screw 5 Ejector lever NSQM1GT8A The NSQM1GT8A interface module provides eight 10 100 1000BASE T copper ports 2 3 4 1 2 3 4 1 ...

Страница 48: ...000BASE X fiber ports 3 Captive screw 4 Ejector lever NSQM1GT4PFCA The NSQM1GT4PFCA interface module provides four 10 100 1000BASE T copper ports that support the bypass feature Figure 32 NSQM1GT4PFCA front view 1 LED 2 10 100 1000BASE T copper ports 3 Captive screw 4 Ejector lever Power supplies CAUTION To install two power supplies for the device make sure the two power supplies are the same mod...

Страница 49: ...as required The PSR650B 12A1 AC power supply and PSR650B 12D1 DC power supply are available for the device For the power supply specifications see Power supplies PSR650B 12A1 AC power supply The PSR650B 12A1 AC power supply provides a rated output power of 650 W Figure 33 PSR650B 12A1 AC power supply front view 1 Retaining latch 2 Handle 3 Power receptacle PSR650B 12D1 DC power supply The PSR650B ...

Страница 50: ... 20F 2 A and FAN 20B 2 A fan trays The FAN 20F 2 A fan tray provides power supply side intake and port side exhaust airflow The FAN 20B 2 A fan tray provides port side intake and power supply side exhaust airflow No fan trays are provided with the device Prepare them yourself as required For the specifications of the fan trays available for the device see Fan trays FAN 20F 2 A Figure 35 FAN 20F 2 ...

Страница 51: ...ing rubber feet and mounting brackets 20 1 kg 44 31 lb NSQM1TG8A interface module 19 8 189 212 4 mm 0 78 7 44 8 36 in 0 55 kg 1 21 lb NSQM1QG2A interface module 19 8 189 212 4 mm 0 78 7 44 8 36 in 0 55 kg 1 21 lb NSQM1G4XS4 interface module 19 8 189 212 4 mm 0 78 7 44 8 36 in 0 54 kg 1 19 lb NSQM1GT8A interface module 19 8 189 212 4 mm 0 78 7 44 8 36 in 0 55 kg 1 21 lb NSQM1GP8A interface module 1...

Страница 52: ...face module 12 96 W NSQM1QG2A interface module 6 40 W NSQM1G4XS4 interface module 6 46 W NSQM1GT8A interface module 3 03 W NSQM1GP8A interface module 8 15 W NSQM1GT4PFCA interface module 5 78 W Power supplies Table 21 PSR650B 12A1 AC power supply specifications Item Specification Rated input voltage range 100 VAC to 240 VAC 50 Hz or 60 Hz Maximum input current 5 A to 10 A Maximum power 650 W Table...

Страница 53: ...specifications Item Specification Dimensions H W D 19 75 7 118 4 mm 0 75 2 98 4 66 in Weight 0 069 kg 0 15 lb Hot swapping Not supported Capacity 480 GB Operating temperature 0 C to 45 C 32 F to 113 F Power consumption 3 W Port specifications Console port Table 25 Console port specifications Item Specification Connector RJ 45 Standard compliant RS 232 Baud rate 9600 bps default to 115200 bps Cable...

Страница 54: ... media dependent interface crossover MDI X standard is typically used on hubs or LAN switches 1000BASE X fiber port Table 27 1000BASE X fiber port specifications Item Specification Connector type LC Transceiver module type See Table 28 and Table 29 Interface speed 1000 Mbps Duplex mode Full duplex Table 28 and Table 29 describe the specifications for the SFP transceiver modules available for the 1...

Страница 55: ...m 1640 42 ft 275 m 902 23 ft 220 m 721 78 ft 220 m 721 78 ft SFP GE LX SM1310 A 10 km 6 21 miles 9 5 to 3 20 to 3 550 m 1804 46 ft 550 m 1804 46 ft SFP GE LH40 SM1310 40 km 24 85 miles 5 to 5 22 to 3 SFP GE LH40 SM1550 40 km 24 85 miles 4 to 1 21 to 3 SFP GE LH80 SM1550 80 km 49 71 miles 4 to 5 22 to 3 SFP GE LH100 SM1550 100 km 62 14 miles 0 to 5 30 to 9 10GBASE R fiber port Table 30 10GBASE R fi...

Страница 56: ...0 1310 SMF 9 125 N A SFP XG LH40 SM1550 1550 SMF 9 125 N A Table 32 SFP transceiver module specifications 2 Transceiver module Transmission distance Transmission speed Transmitted optical power dBm Received optical power dBm SFP XG SX MM850 A 300 m 984 25 ft 10 31 Gbps 7 3 to 1 9 9 to 0 5 82 m 269 03 ft 66 m 216 54 ft 33 m 108 27 ft 26 m 85 30 ft 8 m 26 25 ft SFP XG LX220 MM131 0 220 m 721 78 ft 1...

Страница 57: ...peed LAN PHY 40 Gbps Table 34 describes QSFP transceiver modules available for the 40GBASE R fiber ports Table 34 QSFP transceiver module specifications Item QSFP 40G LR4 WDM1300 Central wavelength nm Four lanes 1271 1291 1311 1331 Fiber mode SMF Fiber diameter µm 9 125 Modal bandwidth MHz km N A Transmission distance 10 km 6 21 miles Transmission speed 40 Gbps Transmitted optical power dBm 7 to 2...

Страница 58: ...ving or sending data Steady green A link is present Off No link is present Ethernet fiber port LED combo interface 1000BASE X Flashing green The port is receiving or sending data at 1000 Mbps Steady green A 1000 Mbps link is present Off No link is present Interface module LEDs Table 36 Interface module LED descriptions LED Mark Status Description Ready LED READY Flashing green 1 Hz The system is o...

Страница 59: ...d The RJ 45 connector is for connecting to the console port of the device and the DB 9 female connector is for connecting to the serial port on the configuration terminal Figure 37 Console cable Table 37 Console cable connection RJ 45 Signal Direction DB 9 1 RTS 7 2 DTR 4 3 TXD 3 4 CD 1 5 GND 5 6 RXD 2 7 DSR 6 8 CTS 8 Ethernet twisted pair cable Introduction An Ethernet twisted pair cable consists...

Страница 60: ...into shielded twisted pair STP and unshielded twisted pair UTP An STP cable provides a metallic braid between the twisted pairs and the outer jacket This metallic braid helps reduce radiation prevent information from being listened and eliminate external electromagnetic interference EMI of external sources STPs have strict application requirements and are expensive although they provide better EMI...

Страница 61: ...port can be MDI for routers and PCs or MDIX for switches Table 39 and Table 40 show their pinouts Straight through cable white orange orange white green blue white blue green white brown brown 1 2 3 4 5 6 7 8 white orange orange white green blue white blue green white brown brown 1 2 3 4 5 6 7 8 Crossover cable white orange orange white green green white orange orange white green blue white blue g...

Страница 62: ...onal data cable D 6 Tx Sends data BIDA Bi directional data cable A 7 Reserved N A BIDC Bi directional data cable C 8 Reserved N A BIDC Bi directional data cable C To ensure normal communication the pins for sending data on one port must correspond to the pins for receiving data on the peer port When both ports on the two devices are MDI or MDIX use a crossover Ethernet cable when one port is MDI a...

Страница 63: ...mode optical fibers Item Single mode fiber Multi mode fiber Core Small core 10 micrometers or less Larger core than single mode fiber 50 micrometers 62 5 micrometers or greater Dispersion Less dispersion Allows greater dispersion and therefore signal loss exists Light source and transmission distance Uses lasers as the light source often within campus backbones for distance of several thousand met...

Страница 64: ... use to avoid damage to their end face Replace the dust cap if it is loose or polluted Before connecting an optical fiber use dust free paper and absolute alcohol to clean the end face of the two fiber connectors You can brush the end faces only in one direction Never bend or curve a fiber If the fiber has to pass through a metallic board hole or bend along the acute side of mechanical parts the f...

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