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Appendix A: Specifications

114

Power Specifications

The following power specifications apply to the AT-2911 adapter:

Table 6. Power Specifications

Model

Power (Watts)

AT-2911SX/ST

1.5 @ +3.3V

AT-2911SX/SC

1.5 @ +3.3V

AT-2911SX/LC

1.5 @ +3.3V

AT-2911LX/SC

1.5 @ +3.3V

AT-2911LX/LC

1.5 @ +3.3V

AT-2911SFP

1.5 @ +3.3V

AT-2911STX/SC

1.7 @ +3.3V

AT-2911STX/LC

1.7 @ +3.3V

AT-2911LTX/SC

1.7 @ +3.3V

AT-2911LTX/LC

1.7 @ +3.3V

AT-2911SX/2LC

2.4 @ +3.3V

AT-2911LX/2LC

2.4 @ +3.3V

AT-2911SFP/2

2.4 @ +3.3V

AT-2911T/2

1.4 @ +3.3V

Содержание 2911 Series

Страница 1: ...net Network Interface Cards AT 2911SX ST AT 2911STX LC AT 2911SX SC AT 2911LTX SC AT 2911SX LC AT 2911LTX LC AT 2911LX SC AT 2911SX 2LC AT 2911LX LC AT 2911LX 2LC AT 2911SFP AT 2911SFP 2 AT 2911STX SC...

Страница 2: ...rks or registered trademarks of their respective owners Allied Telesis Inc reserves the right to make changes in specifications and other information contained in this document without prior written n...

Страница 3: ...ese limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not inst...

Страница 4: ...t should be installed and operated with minimum distance 20cm between the radiator your body European Union Restriction of the Use of Certain Hazardous Substances RoHS in Electrical and Electronic Equ...

Страница 5: ...Part 15 Subpart B Safety EN 60950 1 TUV T UL 60950 1 Translated Safety Statements Important The indicates that a translation of the safety statement is available in a PDF document titled Translated S...

Страница 6: ...6...

Страница 7: ...nstalling Broadcom Utilities 26 Broadcom Documentation 26 Contents of Your Shipment 27 Warranty Registration 28 Chapter 2 Installing the Hardware 29 Reviewing Safety Precautions 30 Pre Installation Ch...

Страница 8: ...nstalling the Driver Software on Windows Server 2003 and XP 92 Updating the Driver Software 97 Updating the Driver on Windows Server 2008 R2 Server 2008 Vista or 7 97 Updating the Driver on Windows Se...

Страница 9: ...igure 27 Large Send Offload v2 IPv4 Page 58 Figure 28 Large Send Offload IPv6 Page 60 Figure 29 Network Address Page 61 Figure 30 NS Offload Page 63 Figure 31 Priority VLAN Page 64 Figure 32 Receive B...

Страница 10: ...rd 3 95 Figure 57 Hardware Update Wizard 4 95 Figure 58 Device Manager with an Expanded List on Windows Server 2008 R2 Server 2008 Vista and 7 98 Figure 59 Network Adapters on Windows Server 2003 XP 9...

Страница 11: ...Naming Conventions 22 Table 3 1000BASE X Fiber Optic Cable Specifications 39 Table 4 Physical Specifications 112 Table 5 Environmental Specifications 113 Table 6 Power Specifications 114 Table 7 MTBF...

Страница 12: ...Tables 12...

Страница 13: ...AT 2911SFP AT 2911STX SC AT 2911STX LC AT 2911LTX SC AT 2911LTX LC AT 2911SX 2LC AT 2911LX 2LC AT 2911SFP 2 AT 2911T 2 The instructions in this guide explain how to install the network adapter on a d...

Страница 14: ...n Caution Cautions inform you that performing or omitting a specific action may result in equipment damage or loss of data Warning Warnings inform you that performing or omitting a specific action may...

Страница 15: ...port tickets learn about Return Merchandise Authorization RMA and contact Allied Telesis technical experts USA and EMEA phone support Select the phone number that best fits your location and customer...

Страница 16: ...Preface 16...

Страница 17: ...dapters and includes the following sections Physical Description on page 18 Model Naming Conventions on page 22 Supported Operating Systems on page 23 Features on page 24 Broadcom Utilities on page 25...

Страница 18: ...Allied Telesis offers models equipped with a single port interface or dual port interface in the AT 2911 series The AT 2911 adapter is equipped with single or dual fiber optic connector copper connect...

Страница 19: ...2LC AT 2911LX 2LC AT 2911SFP 2 AT 2911T 2 The AT 2911LTX LC adapter is shown in Figure 2 Figure 2 AT 2911LTX LC Adapter ST Fiber Optic Connector The AT 2911SX ST adapter is equipped with a 1000BASE SX...

Страница 20: ...T 2911SX LC AT 2911LX LC AT 2911STX LC AT 2911LTX LC AT 2911SX 2LC and AT 2911LX 2LC adapters are equipped with a 1000BASE SX or 1000BASE LX LC fiber optic connector The AT 2911LX 2LC and AT 2911SX 2L...

Страница 21: ...r to a compatible link partner The AT 2911SFP 2 adapter has two SFP slots Note An SFP transceiver must be purchased separately For a list of supported transceivers contact your Allied Telesis distribu...

Страница 22: ...sical layer standard for Gigabit Ethernet transmission or SFP option The following is a list of standards SX 1000BASE SX multi mode fiber optic cable LX 1000BASE LX single mode fiber optic cable T 10...

Страница 23: ...the supported operating systems for the AT 2911 series adapters Windows XP 32 bit Windows XP 64 bit Windows Server 2003 32 bit Windows Server 2003 64 bit Windows Vista 32 bit Windows Vista 64 bit Win...

Страница 24: ...tag support IEEE 802 1Q Jumbo packet 9K TCP IP and UDP checksum TCP segmentation Transmit Side Scaling TSS Receive Side Scaling RSS 17 Receive Queues 16 Transmit Queues 17 MXI x Vectors support per q...

Страница 25: ...formation about teaming and how to install BASP and BACS see the Broadcom NetXtreme 57XX User Guide To view the document refer to Broadcom Documentation on page 26 CIM The Common Information Model CIM...

Страница 26: ...g Broadcom Utilities To download Broadcom utilities do the following 1 Open a web browser such as Internet Explorer or FireFox on your system and enter the following http www alliedtelesis com support...

Страница 27: ...hed however you can replace it with the standard profile bracket if your PCIe slot is the standard profile size Note The AT 2911 adapter is not shipped with a software driver CD You must download the...

Страница 28: ...e products are covered under limited warranties All Allied Telesis warranties are subject to and provided only on the terms and conditions set out in the Allied Telesis Limited Warranties listed on th...

Страница 29: ...apter contains the following sections Reviewing Safety Precautions on page 30 Pre Installation Checklist on page 32 Replacing the Bracket on page 33 Installing the AT 2911 Series Adapter Card on page...

Страница 30: ...t www alliedtelesis com support Warning This is a Class 1 LED product L1 Warning Do not stare into the laser beam L2 Warning Do not look directly at the fiber optic cable ends or inspect the cable end...

Страница 31: ...ourself and to prevent damage to the system components Remove any metallic objects or jewelry from your hands and wrists Make sure to use only insulated or nonconducting tools Verify that the system i...

Страница 32: ...te record the path to where the driver file resides on your system 4 If your computer is active shut it down 5 When the system shutdown is complete power off and unplug your system 6 Holding the adapt...

Страница 33: ...e the low profile bracket from the adapter and replace it with the standard bracket You can also use this procedure to remove the standard bracket and replace it with the low profile bracket To replac...

Страница 34: ...Chapter 2 Installing the Hardware 34 Figure 11 Fastening Screws onto Standard Bracket...

Страница 35: ...2 Before installing the adapter ensure the system power is OFF and unplugged from the power outlet and that proper electrical grounding procedures have been followed Warning To prevent electric shock...

Страница 36: ...ntation that came with your system 5 Remove the network adapter card from the shipping package and store the packaging material in a safe location Caution A module can be damaged by static electricity...

Страница 37: ...cause this may damage the system or the module If the module resists seating remove it from the system realign it and try again E47 7 Secure the network adapter card to the chassis with a Phillips hea...

Страница 38: ...ound New Hardware Wizard launches automatically except Windows 7 and Windows Server 2008 R2 systems For installing the driver software refer to the section for your Windows Operating system Once the s...

Страница 39: ...C connectors For optical characteristics of the AT 2911 adapter see Appendix A Specifications on page 111 In addition the AT 2911 data sheet is available on the Allied Telesis website www alliedtelesi...

Страница 40: ...rk cable with RJ 45 connectors See Twisted Pair Copper Port on page 20 1 Connect one end of the cable to the adapter 2 Connect the other end of the cable to the appropriate Ethernet network port or tw...

Страница 41: ...ad on page 54 Jumbo Mtu on page 55 Large Send Offload IPv4 on page 56 Large Send Offload v2 IPv4 on page 58 Large Send Offload v2 IPv6 on page 60 Network Address on page 61 NS Offload on page 63 Prior...

Страница 42: ...erties may change Verify the settings after upgrading the driver software Twisted pair copper port In addition to the advanced properties listed on page 41 twisted pair copper ports have the following...

Страница 43: ...ct a feature you want to change its setting 1 To access the Device Manager follow one of these procedures Accessing Device Manager on Windows Server 2008 R2 Server 2008 Vista or 7 on page 85 Accessing...

Страница 44: ...Chapter 3 Modifying Advanced Properties 44 3 Click the Advanced tab The Advanced Properties window opens as shown in Figure 17 Figure 17 Advanced Properties Window...

Страница 45: ...he network link is idle Note This feature is valid only for copper ports For fiber connectors the setting is always disabled To enable or disable the 802 3az EEE feature do the following 1 Access the...

Страница 46: ...ect one of the following options Disable The Energy Efficient Ethernet feature is off This is the default setting Note For fiber connectors the setting is always disabled Enable The adapter saves ener...

Страница 47: ...RP Offload feature do the following 1 Access the Advanced Properties See Accessing Advanced Properties on page 43 2 Select ARP Offload in the Property box The ARP Offload page is displayed as shown in...

Страница 48: ...ing Advanced Properties on page 43 2 Select EEE Control in the Property box The EEE Control page is displayed as shown in Figure 20 Figure 20 EEE Control Page 3 Select one of the following options Opt...

Страница 49: ...irs of wires are available in the connected cable Note This feature is valid only for copper ports For fiber connectors the setting is always disabled To enable or disable the Ethernet WireSpeed featu...

Страница 50: ...ablish a link at 1000 Mbps Note For fiber connectors the setting is always disabled Enabled The adapter establishes a link at a lower speed when only two pairs of wires are available in the connected...

Страница 51: ...its link partner You can enable or disable the adapter to process received PAUSE frames and transmit PAUSE frames To enable or disable the Flow Control feature do the following 1 Access the Advanced...

Страница 52: ...s the default setting Disabled The adapter ignores PAUSE frames Tx Rx Enabled The adapter processes PAUSE frames when receiving and transmits PAUSE frames Rx Enabled The adapter processes PAUSE frames...

Страница 53: ...n decreases however the latency may increase To enable or disable the Interrupt Moderation feature do the following 1 Access the Advanced Properties See Accessing Advanced Properties on page 43 2 Sele...

Страница 54: ...dvanced Properties on page 43 2 Select IPv4 Checksum Offload in the Property box The IPv4 Checksum Offload page is displayed as shown in Figure 24 Figure 24 IPv4 Checksum Offload Page 3 Select one of...

Страница 55: ...me size is specified however the network must be capable of supporting the oversized Ethernet frames To change the Jumbo Mtu setting do the following 1 Access the Advanced Properties See Accessing Adv...

Страница 56: ...4kb The Large Send Offload v2 IPv4 which supports large packets up to 256kb overrides the Large Send Offload IPv4 feature if both features are enabled For more information see Large Send Offload v2 IP...

Страница 57: ...ters Installation and User s Guide 57 3 Select one of the following options Disabled This feature is disabled Enabled The adapter segments large packets up to 64kb for IPv4 traffic before sending them...

Страница 58: ...s the CPU load This feature which supports large packets up to 256kb overrides the Large Send Offload IPv4 feature if both features are enabled To enable or disable the Large Send Offload v2 IPv4 feat...

Страница 59: ...ters Installation and User s Guide 59 3 Select one of the following options Disabled The feature is disabled Enabled The adapter segments large packets up to 256kb for IPv4 traffic before sending them...

Страница 60: ...ffload v2 IPv6 feature do the following 1 Access the Advanced Properties See Accessing Advanced Properties on page 43 2 Select Large Send Offload v2 IPv6 in the Property box The Large Send Offload v2...

Страница 61: ...locally administered address Caution A locally administered address overrides the original MAC address stored in the AT 2911 adapter hardware When you change the MAC address be sure to assign a unique...

Страница 62: ...are guidelines to assigning a locally administered address The address must be unique The address consists of a 12 digit hexadecimal number for example 000C46005501 The range is from 0000 0000 0001 t...

Страница 63: ...isable the NS Offload feature do the following 1 Access the Advanced Properties See Accessing Advanced Properties on page 43 2 Select NS Offload in the Property box The NS Offload page is displayed as...

Страница 64: ...th Priority Enabled the adapter sends and receives QoS tagged frames with VLAN Enabled the adapter sends and receives VLAN tagged frames To assign a VLAN ID to the adapter see VLAN ID on page 77 To en...

Страница 65: ...Select one of the following options Priority VLAN Enabled The adapter sends and receives QoS and VLAN tagged frames This is the default setting Priority Enabled The adapter sends and receives QoS tagg...

Страница 66: ...dvanced Properties See Accessing Advanced Properties on page 43 2 Select Receive Buffers in the Property box The Receive Buffers page is displayed as shown in Figure 32 Figure 32 Receive Buffers Page...

Страница 67: ...multiple CPUs in a multiprocessor system To enable or disable the Receive Side Scaling feature do the following 1 Access the Advanced Properties See Accessing Advanced Properties on page 43 2 Select R...

Страница 68: ...allows you to specify the number of RSS queues that the adapter assigns receiving data to To Specify the RSS Queues value do the following 1 Access the Advanced Properties See Accessing Advanced Prope...

Страница 69: ...options Note The supported number of RSS queues and default setting depend on the adapter and operating system You might not see all options listed below RSS 4 Queues The system allocates four RSS qu...

Страница 70: ...erface Note This feature is valid only for copper ports For fiber connectors the setting is always Auto To change the Speed Duplex property do the following 1 Access the Advanced Properties See Access...

Страница 71: ...the default setting Note For fiber connectors the setting is always Auto 10 Mbps Half Duplex 10 Mbps speed in the half duplex mode 10 Mbps Full Duplex 10 Mbps speed in the full duplex mode 100 Mbps H...

Страница 72: ...ecksum of receiving IPv4 packets taking load off from the CPU To modify the TCP UDP Checksum Offload IPv4 setting do the following 1 Access the Device Manger on your operating system See Accessing Adv...

Страница 73: ...d Enables the TCP UDP Checksum Offload IPv4 function for both receiving and transmitting IPv4 packets This is the default setting Rx Enabled Enables the TCP UDP Checksum Offload IPv4 function only for...

Страница 74: ...m of receiving IPv6 packets taking load off from the CPU To enable or disable the TCP UDP Checksum Offload IPv6 feature do the following 1 Access the Device Manger on your operating system See Accessi...

Страница 75: ...d Enables the TCP UDP Checksum Offload IPv6 function for both receiving and transmitting IPv6 packets This is the default setting Rx Enabled Enables the TCP UDP Checksum Offload IPv6 function only for...

Страница 76: ...s 7 64 bit operating systems only To make this feature effective the host computer must be set in virtual environment To change the Virtual Machine Queues do the following 1 Access the Advanced Proper...

Страница 77: ...AN ID to a frame in the VLAN tag before transmitting the frame To change the VLAN ID value do the following 1 Access the Advanced Properties See Accessing Advanced Properties on page 43 2 Select VLAN...

Страница 78: ...t computer must be set in virtual environment To enable or diable the VMQ Lookahead Split feature do the following 1 Access the Advanced Properties See Accessing Advanced Properties on page 43 2 Selec...

Страница 79: ...erating systems only To make this feature effective the host computer must be set in virtual environment To enable or disable the VMQ VLAN Filtering feature do the following 1 Access the Advanced Prop...

Страница 80: ...Chapter 3 Modifying Advanced Properties 80...

Страница 81: ...river software for the AT 2911 adapter onto your operating system It contains the following topics Overview on page 82 Downloading the Driver Software on page 83 Accessing the Device Manager on page 8...

Страница 82: ...a new adapter and may install a default driver To update the driver software for the AT 2911 adapter follow the instructions described in Downloading the Driver Software on page 83 and Updating the D...

Страница 83: ...a web browser such as Internet Explorer or FireFox on your system and enter the following http www alliedtelesis com support software 2 The Allied Telesis Software Download page is displayed 3 Enter 2...

Страница 84: ...wn in Figure 43 pops up and prompts you to specify the location of a folder that you want to place unzipped files in Figure 43 Specifying the Folder for Unzipped Files 7 Specify the location of the fo...

Страница 85: ...follow one of the procedures below Accessing Device Manager on Windows Server 2008 R2 Server 2008 Vista or 7 next Accessing Device Manager on Windows Server 2003 and XP on page 86 Accessing Device Ma...

Страница 86: ...ure 45 Figure 45 Device Manager Window on Windows Server 2008 R2 Sever 2008 Vista and 7 Accessing Device Manager on Windows Server 2003 and XP To access Device Manager on Windows Server 2003 or Window...

Страница 87: ...etwork Adapters Installation and User s Guide 87 Figure 46 System Properties Window on Windows Server 2003 and XP 2 Select the Hardware Tab The Hardware page is shown in Figure 47 Figure 47 Hardware P...

Страница 88: ...Chapter 4 Installing the Driver Software 88 3 Click Device Manager The Device Manager window opens as shown in Figure 48 Figure 48 Device Manager Window on Windows Server 2003 and XP...

Страница 89: ...g Windows Server 2008 R2 Server 2008 Vista 7 Server 2003 and XP To install the driver software on your system follow one of the procedures below Installing the Driver Software on Windows Server 2008 R...

Страница 90: ...thernet Controller on Windows Server 2008 R2 Server 2008 Vista and 7 3 Select Update Driver Software The Update Driver Software window pops up as shown in Figure 50 Figure 50 Update Driver Software Wi...

Страница 91: ...to enter the location of the driver folder as shown in Figure 51 Figure 51 Update Device Software Window on Windows Server 2008 R2 Server 2008 Vista and 7 5 Specify the location of the driver softwar...

Страница 92: ...stalling the Driver Software on Windows Server 2003 and XP To install the driver software onto Windows Server 2003 and Windows XP do the following 1 Access Device Manger See Accessing Device Manager o...

Страница 93: ...ers Installation and User s Guide 93 Figure 53 Ethernet Controller on Windows Server 2003 and XP 3 Select Update Driver The Hardware Update Wizard window pops up as shown in Figure 54 Figure 54 Hardwa...

Страница 94: ...mpts you to select one of two options as shown in Figure 55 Figure 55 Hardware Update Wizard 2 6 Select Install from a list or specific location Advanced 7 Click Next The Hardware Update Wizard prompt...

Страница 95: ...work Adapters Installation and User s Guide 95 Figure 56 Hardware Update Wizard 3 8 Specify the location of the driver software 9 Click Next The confirmation message is displayed as shown in Figure 57...

Страница 96: ...Chapter 4 Installing the Driver Software 96 10 Click Finish...

Страница 97: ...stalled the driver software Device Manager does not know the name and lists your adapter as Ethernet Controller or as a Broadcom device The procedures for installing the driver software are slightly d...

Страница 98: ...prompts you to enter the location of the driver folder as shown in Figure 51 on page 91 5 Specify the location of the driver software 6 Click Next The confirmation message appears when the driver sof...

Страница 99: ...ver 2003 XP 3 Select Update Driver The Hardware Update Wizard window pops up as shown in Figure 54 on page 93 4 Select No not this time 5 Click Next The Hardware Update Wizard prompts you to select on...

Страница 100: ...Chapter 4 Installing the Driver Software 100 9 Click Next The confirmation message is displayed as shown in Figure 57 on page 95 10 Click Finish...

Страница 101: ...alling the Driver Software This chapter describes how to uninstall the driver software for the AT 2911 adapter This chapter contains the following topics Overview on page 102 Uninstalling the Driver S...

Страница 102: ...iver software from your operating system Guidelines Here are the guidelines to uninstalling the driver software from your system You must have Administrator privileges to remove the driver software Be...

Страница 103: ...ows XP operating systems click the next to the Network Adapters folder to expand the Network Adapter folder The selection expands to show the list of installed network adapter cards 4 Right click Alli...

Страница 104: ...Chapter 5 Uninstalling the Driver Software 104 7 Click OK to complete the uninstall...

Страница 105: ...describes troubleshooting procedures and contains the following sections Troubleshooting Checklist on page 106 Checking a Port LED on the Adapter on page 107 Testing Network Connectivity on page 108 S...

Страница 106: ...page 29 Make sure that the adapter board is properly seated in a PCIe slot Check for specific hardware problems such as obvious damage to board components or the PCIe edge connector Check the configur...

Страница 107: ...d properly The LED is lit solid if data traffic is present Before the port LED can provide troubleshooting information the adapter must be connected to the network and the network driver for your part...

Страница 108: ...or link partner are forced to the same speed Or make sure the adapter and the link partner are configured for Auto Negotiation 1 Start the DOS prompt See Starting the DOS Diagnostic Utility on page 10...

Страница 109: ...re an IP address manually Problem When creating 64 VLANs all virtual adapters show disconnected or one of the 64 VLANs shows disabled Solution The maximum VLAN configurations are 63 tagged and one unt...

Страница 110: ...Chapter 6 Troubleshooting 110...

Страница 111: ...pendix contains the following specifications Physical and Power Specifications on page 112 Environmental Specifications on page 113 Power Specifications on page 114 Performance Specification on page 1...

Страница 112: ...8 8 3 5 6 9 2 7 56 7 2 0 AT 2911SX LC 8 8 3 5 6 9 2 7 56 7 2 0 AT 2911LX SC 8 8 3 5 6 9 2 7 56 7 2 0 AT 2911LX LC 8 8 3 5 6 9 2 7 56 7 2 0 AT 2911SFP 8 9 3 5 6 9 2 7 45 4 1 6 AT 2911STX SC 8 8 3 5 6...

Страница 113: ...lowing environmental specifications apply to the AT 2911 adapter Table 5 Environmental Specifications Operating Temperature 0 C to 45 C 32 F to 113 F Storage Temperature 20 C to 70 C 4 F to 158 F Oper...

Страница 114: ...cations Model Power Watts AT 2911SX ST 1 5 3 3V AT 2911SX SC 1 5 3 3V AT 2911SX LC 1 5 3 3V AT 2911LX SC 1 5 3 3V AT 2911LX LC 1 5 3 3V AT 2911SFP 1 5 3 3V AT 2911STX SC 1 7 3 3V AT 2911STX LC 1 7 3 3...

Страница 115: ...f the AT 29xx Series adapters Table 7 MTBF Specifications Model MTBF 30C AT 2911SX ST 860 000 AT 2911SX SC 1 960 000 AT 2911SX LC 1 550 000 AT 2911LX SC 810 000 AT 2911LX LC 1 130 000 AT 2911SFP 7 720...

Страница 116: ...adapters Table 8 Optical Specifications Optical Sensitivity Output Optical Power Wavelength 1000SX ST Connector 17 dBm 9 5 4 dBm 850 nm 1000SX SC Connector 17 dBm 9 5 4 dBm 850 nm 1000SX LC Connector...

Страница 117: ...This appendix explains how to clean fiber optic connectors and includes the following topics Overview on page 118 Cleaning Fiber Optic Connectors Using a Cartridge Type Cleaner on page 119 Cleaning F...

Страница 118: ...ven minor smudges or dirt on the end face of the fiber completely invisible to the naked eye can disrupt light transmission and lead to failure of the component or of the entire system Therefore it is...

Страница 119: ...eaner Note Do not use compressed air or aerosol air to clean a fiber optic connector To clean a fiber optic connector using a cartridge cleaner do the following 1 With one hand hold the cartridge clea...

Страница 120: ...lectricity that can damage the fiber optic cable E82 4 If desired repeat steps 3 and 4 5 If a fiber inspection scope is available use the scope to inspect the ferrule end face to make sure that it is...

Страница 121: ...ilable in both 2 5 mm and 1 25 mm sizes for use on SC and MU connectors respectively See Figure 66 Note NEVER use a household cotton swab and or alcohol to clean a fiber optic connector This may leave...

Страница 122: ...tor to make sure that it is clean and to check for scratches pits or other problems that may affect performance Note Always keep a dust cap on a fiber optic cable when it is not in use Warning Do not...

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