Ruijie RG-S6580-48CQ8QC Hardware Installation And Reference Manual
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Ruijie RG-S6580-48CQ8QC Hardware Installation And Reference Manual

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Ruijie RG-S6580-48CQ8QC Switch
Hardware Installation and Reference Guide
Document Version: V2.0
Date: August 24, 2023
Copyright © 2023 Ruijie Networks

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Summary of Contents for Ruijie RG-S6580-48CQ8QC

  • Page 1 Ruijie RG-S6580-48CQ8QC Switch Hardware Installation and Reference Guide Document Version: V2.0 Date: August 24, 2023 Copyright © 2023 Ruijie Networks...
  • Page 2 Due to product version upgrades or other reasons, the content of this document will be updated from time to time. Ruijie Networks reserves the right to modify the content of the document without any notice or prompt. This manual is for reference only. Ruijie Networks endeavors to ensure content accuracy and will not shoulder any responsibility for losses and damages caused due to content omissions, inaccuracies or errors.

  • Page 3: Preface

    Preface Intended Audience This document is intended for:  Network engineers  Technical support and servicing engineers  Network administrators Technical Support  Ruijie Networks website: https://www.ruijienetworks.com/  Technical support website: https://ruijienetworks.com/support  Case portal: https://caseportal.ruijienetworks.com  Community: https://community.ruijienetworks.com ...
  • Page 4 Specification An alert that contains a description of product or version support. 2. Note The manual offers configuration information (including model, port type and command line interface) for indicative purpose only. In case of any discrepancy or inconsistency between the manual and the actual version, the actual version prevails.

  • Page 5: Table Of Contents

    Contents Preface ..............................I 1 Overview ............................1 1.1 About the RG-S6580-48CQ8QC ....................1 1.2 Component Modules ........................1 1.3 Chassis ............................2 1.3.1 Appearance ........................2 1.3.2 LEDs ..........................4 1.3.3 Ports ..........................6 1.3.4 Cooling ........................... 8 1.3.5 Technical Specifications ....................8 1.3.6 Asset Tag ........................
  • Page 6 2.1.1 General Precautions ....................23 2.1.2 Chassis-Lifting Guidelines ................... 23 2.1.3 Electricity Safety ......................24 2.1.4 Preventing ESD Damage ..................... 24 2.1.5 Laser Safety ......................... 25 2.1.6 Storage Guidelines ...................... 25 2.2 Site Requirements ........................25 2.2.1 Floor Loading ....................... 25 2.2.2 Airflow ...........................
  • Page 7 3.2.1 Installation Guidelines ....................35 3.2.2 Procedure ........................35 3.3 Installing the Chassis ....................... 36 3.3.1 Installation Guidelines ....................36 3.3.2 Mounting the Brackets ....................36 3.3.3 Mounting the Chassis on the Rack ................37 3.4 Installing the Protective Grounding Wire ................. 38 3.4.1 Installation Guidelines ....................
  • Page 8 5 Monitoring and Maintenance ......................48 5.1 Monitoring ..........................48 5.1.1 Monitoring the LEDs ....................48 5.1.2 Running the CLI Commands ..................48 5.2 Maintenance ..........................49 5.2.1 Replacing the Power Module ..................49 5.2.2 Replacing the Fan Module ................... 49 5.2.3 Replacing the Lithium Battery ..................
  • Page 9 7.2.1 100BASE-TX/10BASE-T Port ..................56 7.2.2 1000BASE-T Port ......................56 7.3 Surge Protection ........................58 7.3.1 Installing an AC Power Arrester ................... 58 7.3.2 Installing an Ethernet Port Arrester ................60 7.4 Site Selection ........................... 61 7.5 Recommended Cabling ......................62...

  • Page 10: Overview

    Ruijie Networks for Artificial Intelligence (AI) and other applications. The RG-S6580-48CQ8QC switch delivers high-density 100GE access, 400GE uplink ports, and diverse data center features. It can be used with Ruijie’s RG-N18000- XH and RG-S6980-64QC switches for a high-performance and high-reliability data center network.

  • Page 11: Chassis

    HVDC input. For example, input 1 uses mains electricity (AC power) and input 2 use Uninterrupted Power Supply (UPS) HVDC power. Chassis The RG-S6580-48CQ8QC hardware system consists of a chassis, a power supply system, and a cooling system.  Power supply system: provides two power module slots and supports 1+1 power redundancy.
  • Page 12 Hardware Installation and Reference Guide Overview 2. Structure Figure 1-3 Front Panel Structure Table 1-3 Front Panel Components Component System status LED BMC status LED Power status LED Fan status LED Locating LED DSFP port DSFP port LED QSFP-DD port QSFP-DD port LED Asset tag Figure 1-4 Rear Panel Structure...

  • Page 13: Leds

    Hardware Installation and Reference Guide Overview Table 1-4 Rear Panel Components Component Power module slot Fan module slot Management port USB port Console port 1.3.2 LEDs Table 1-5 LEDs Silkscreen Description Label Solid green: The system is operating normally. Blinking green: The system is starting up. Solid red: ○...
  • Page 14 Hardware Installation and Reference Guide Overview Silkscreen Description Label Solid yellow: Reserved Off: The BMC module is not connected or not functioning properly after being connected. Solid green: All fan modules are operating normally. Solid yellow: Reserved Fan status Solid red: At least one fan module is not functioning properly.

  • Page 15: Ports

    Hardware Installation and Reference Guide Overview Silkscreen Description Label Solid yellow: The port has made a successful 10/100 Mbps link. Blinking yellow: The port is sending and receiving traffic at 10/100 Mbps. Management LINK/ACT Solid green: The port has made a successful 1,000 port LED Mbps link.
  • Page 16 Hardware Installation and Reference Guide Overview Port Connector Type Description Accessory Optical attributes: Subject to the module or cable The management port is used to set up the onsite or remote configuration environment. Standards compliance: CAT5 or higher Management port RJ45 IEEE802.3ab cable...

  • Page 17: Cooling

    Hardware Installation and Reference Guide Overview 1.3.4 Cooling The RG-S6580-48CQ8QC adopts the front-to-rear airflow. Air flows in through the ports and out through the power module, as shown in Figure 1-5. Caution  Maintain a minimum clearance of 200 mm (7.87 in.) around the equipment for air circulation.
  • Page 18 Hardware Installation and Reference Guide Overview Class Item Specification Dimensions Without packing materials: 442 mm x 700 mm x 44 mm (17.40 in. x 27.56 in. x 1.73 in., 1 RU) (W x D x H) Chassis and modules (six fan modules and two Weight power modules) without packing materials: 11.5 Physical...
  • Page 19 Hardware Installation and Reference Guide Overview Class Item Specification Operating humidly: 10% RH to 90% RH (non- condensing) Humidity Storage humidity: 5% RH to 95% RH (non- condensing) Noise Sound pressure level at 27° C(80.6° F): < 78 dB AC power protection Surge protection Common mode: 2 kV Differential mode: 1 kV...
  • Page 20 Hardware Installation and Reference Guide Overview Class Item Specification Max current: 6.5 A RG-PA1200I-F: 1,000 W (100 V AC to 127 V AC) Max. output power consumption 1,300 W (200 V AC to 240 V AC) 1,300 W (180 V DC to 300 V DC) RG-PA1200I-F: Front-to-rear airflow (air exhaust on Airflow direction power module panel)

  • Page 21: Asset Tag

    You can add your own asset tracking label without interfering with the intended air flow. Figure 1-6 Asset Tag Power Module The smart power module for the RG-S6580-48CQ8QC supports power consumption management and hot swapping. It can obtain the output power, output current, and operating temperature in real time. Caution ...

  • Page 22: Rg-Pa1200I-F

    Hardware Installation and Reference Guide Overview 1.4.1 RG-PA1200I-F 1. Appearance Figure 1-7 Appearance Figure 1-8 Structure Table 1-8 Components Component Description Front-to-rear airflow Handle Handle of the power module Power Three-pin connector connector...
  • Page 23 Hardware Installation and Reference Guide Overview Latch Latch of the power module Power status LED 2. LED Table 1-9 Silkscreen Description Label Solid green: The power module is outputting power normally. Blinking green at 1 Hz: ○ The power module is in PS OFF state with only 12 V standby output.
  • Page 24 Hardware Installation and Reference Guide Overview Item Specification Power connector C14 connector for connection with 10 A AC power cord AC: 110 V AC/220 V AC, 50 Hz/60 Hz Rated input voltage range HVDC: 240 V DC AC: 90 V AC to 264 V AC, 47 Hz to 63 Hz Max.

  • Page 25: Fan Module

    Hardware Installation and Reference Guide Overview Fan Module 1.5.1 M1HFAN II-F 1. Appearance Figure 1-9 Appearance Figure 1-10 Structure...
  • Page 26 Hardware Installation and Reference Guide Overview Table 1-11 Components Component Description Handle Handle of the fan module Fan status LED Latch Latch of the Fan module 2. LED Table 1-12 Silkscreen Description Label Solid green: The fan module is operating normally. Blinking green: The fan module is being initialized.

  • Page 27: Cables

    Hardware Installation and Reference Guide Overview Item Specification Max. airflow volume 38.24 CFM Max. air pressure 1130 Pa Hot swapping Supported Cooling Front-to-rear airflow (air exhaust on fan module panel) Automatic speed regulation Supported Status monitoring Rotation speed monitoring and fault alarm Cables 1.6.1 Console Cable...

  • Page 28: Ethernet Cable

     The equipment supports automatic MDI/MID-X crossover detection. Both straight through and crossover cables are applicable. 1.6.3 Power Cord 1. Applicable Power Cords Table 1-15 Power Cords Chassis AC/HVDC Power Cord CAB-1.5M-GB-C-10A-B CAB-3M-GB-10A-B CAB-5M-GB-10A-B CAB-2M-IEC-10A-B RG-S6580-48CQ8QC CAB-2M-IEC-10A-Y CAB-3M-IEC-10A-B CAB-3M-IEC-10A-Y CAB-5M-IEC-10A-B...
  • Page 29 2. AC/HVDC Power Cord Select power cords based on the types of power sockets used in your equipment room. Ruijie provides the following types of power cords to suit different the power sockets: ...

  • Page 30: Grounding Wire

    ID: 6.4 mm (0.25 in.), OD: 16 mm (0.63 in.), T: 1 mm (0.04 in.) washer Barrel sleeve Black barrel sleeve Pluggable Modules Table 1-17 Pluggable Modules Applicable to Chassis Chassis 100GE Series 400GE Series 100G-AOC-1M 400G-QDD-ZR-SM1550 100G-AOC-5M 400G-QDD-DR4-SM1310 RG-S6580-48CQ8QC 100G-AOC-10M 400G-QDD-FR4-SM1310 100G-QSFP-ER4-SM1310 400G-QDD-SR8-MM850 100G-QSFP-iLR4-SM1310...
  • Page 31 Caution  Always use Ruijie certified pluggable modules. Uncertified pluggable modules may lead to service instability. Ruijie will not claim responsibility for the service problems caused by uncertified pluggable modules or provide a solution.  The models of pluggable modules applicable to the chassis are subject to update without prior notification.

  • Page 32: Preparing For Installation

    Hardware Installation and Reference Guide Preparing for Installation Preparing for Installation Safety Guidelines Note  To avoid personal injury or equipment damage, review the safety guidelines in this chapter before you begin the installation.  The following safety precautions may not include all the potentially hazardous situations. 2.1.1 General Precautions ...

  • Page 33: Electricity Safety

    Hardware Installation and Reference Guide Preparing for Installation packing carton during transportation. Avoid placing the chassis side up or upside down.  Do not stack bare demo units. Separate demo units using foam blocks. Do not stack over three layers, each with a height of up to 1 meter (3.28 ft.). Lay the foam blocks side-by-side. 2.1.3 Electricity Safety ...

  • Page 34: Laser Safety

    Hardware Installation and Reference Guide Preparing for Installation 2.1.5 Laser Safety The optical transceivers are Class I laser products. Attention should be paid to the following items:  When an optical transceiver is working, ensure that the port is connected to an optical cable or covered by a dust cap to keep out dust and prevent burning your eyes.

  • Page 35: Temperature

    Hardware Installation and Reference Guide Preparing for Installation easily.  The front and rear of the chassis must remain unobstructed to ensure adequate airflow and prevent overheating inside the chassis. 2.2.4 Temperature To ensure normal operation and prolonged service life of the equipment, maintain an appropriate temperature in the equipment room.

  • Page 36: System Grounding

    Hardware Installation and Reference Guide Preparing for Installation Table 2-1 Dust and Particles Requirement Minimum Dust and Unit Maximum Quantity Particles Diameter 0.5 μm 3.5 x 10 Particles/m 5 μm Particles/m 3.0 x 10 Apart from dust, there are also requirements on the salt, acid, and sulfide in the air of the equipment room.

  • Page 37: Preventing Electromagnetic Interference

    Hardware Installation and Reference Guide Preparing for Installation Ensure that the rack and power distribution system are securely grounded. Otherwise, electric shocks may occur when the insulation resistance between the power module and the chassis becomes small. Caution The building should provide a protective ground connection to ensure that the equipment is connected to a protective earth.

  • Page 38: Surge Protection

    Hardware Installation and Reference Guide Preparing for Installation  Interference prevention measures should be taken for the power supply system.  Keep the equipment far away from the grounding facility and surge protector facility of the power device.  Keep the equipment far away from high-frequency current devices such as the high-power radio transmitting station and radar launcher.

  • Page 39: Tools

    Hardware Installation and Reference Guide Preparing for Installation (3) The square hole rack post is at least 180 mm (7.09 in.) from the front door, and the front door is at most 25 mm (0.98 in.) thick. This ensures an available clearance of at least 155 mm (6.10 in.).

  • Page 40: Unpacking The Container

    Hardware Installation and Reference Guide Preparing for Installation Note The preceding items are delivered against the purchase contact. Check your goods carefully against Package Contents or purchase contract. If you have any questions, contact your distributor. 2.5.2 Unpacking the Container Cut off the packing straps on the shipping box with scissors, place the box on a flat surface, and check whether the seal on top of box is intact.
  • Page 41 Hardware Installation and Reference Guide Preparing for Installation Figure 2-5 Figure 2-6 Place the switch with the panel foam facing upwards. Remove the panel foam and set it aside. Move the switch with both hands onto the shipping box of another product, and remove the foam on the other side.

  • Page 42: Installing The Switch

    Hardware Installation and Reference Guide Installing the Switch Figure 2-7 (8) Press the power module inward to ensure that the power module is fully seated into the system. Installing the Switch Make sure that guidelines and requirements in chapter 2 have been met before you begin the installation.

  • Page 43: Installation Procedure

    Hardware Installation and Reference Guide Installing the Switch Installation Procedure Figure 3-1 Installation Procedure Start Prepare Install the chassis. Connect the grounding wire. Install the power module. Connect the power cord. Verify installation. Set the power Troubleshoot switch to ON. Set the power Normal? switch to OFF.

  • Page 44: Installing The Rack

    Hardware Installation and Reference Guide Installing the Switch Installing and Removing the Power Module Installing the Pluggable Module Verifying Installation Connecting the Power Cord Installing the Rack 3.2.1 Installation Guidelines Make sure the following guidelines are met:  All expansion bolts for securing the rack base to the ground are installed from bottom to up in the sequence of large flat washer, spring washer, and nut, and the installation holes on the base are flush with the expansion bolts.

  • Page 45: Procedure

    Hardware Installation and Reference Guide Installing the Switch 3.2.2 Procedure (1) Make sure that there is enough space before installing the rack. Reserve enough clearance before the front and rear doors for equipment maintenance. (2) Mount and fasten the rack in the planned location. (3) Install the appropriate chute and cables.

  • Page 46: Mounting The Chassis On The Rack

    Hardware Installation and Reference Guide Installing the Switch 3.3.3 Mounting the Chassis on the Rack The chassis can be installed on a standard 19-inch EIA rack. Mount the chassis on the rack with its front panel facing forward. You are advised to use a tray or guide rails to assist in installing the chassis on the rack.

  • Page 47: Installing The Protective Grounding Wire

    Hardware Installation and Reference Guide Installing the Switch Installing the Protective Grounding Wire 3.4.1 Installation Guidelines A reliable grounding system is the basis for stable and reliable operation, which is indispensable for preventing lightning strikes and interference. The chassis has a grounding stud on its rear panel.

  • Page 48: Installing And Removing The Fan Module

    Hardware Installation and Reference Guide Installing the Switch Danger  To ensure personal and equipment safety, it is necessary to ground the switch properly. The resistance between the chassis and the ground must be less than 0.1-ohm.  The maintenance personnel should check whether the AC power socket is reliably connected to the building's protective ground.

  • Page 49: Removing The Fan Module

    Hardware Installation and Reference Guide Installing the Switch Figure 3-4 Installing the Fan Module Warning  Slide the fan module all the way into the chassis gently. Align the fan module in the right orientation to the open fan slot. ...

  • Page 50: Installing And Removing The Power Module

    Hardware Installation and Reference Guide Installing the Switch  If the fan module slot is to remain empty, install a filler panel to allow for adequate airflow and to keep dust out of the chassis. Installing and Removing the Power Module Wear an ESD-preventive wrist strap and an ESD-preventive glove before proceeding with the following operation.

  • Page 51: Removing The Power Module

    Hardware Installation and Reference Guide Installing the Switch Figure 3-7 Securing the Power Cord Warning  Slide the power module all the way into the chassis gently. Align the power module in the right orientation to the open power slot. ...

  • Page 52: Installing The Pluggable Module

    Make sure that you have mounted the chassis on the rack before installing the pluggable module.  For procedure, see Ruijie Optical Module Hardware Installation and Reference Guide for details. The documentation is subject to update without prior notification. Please access Ruijie Networks at https://www.ruijienetworks.com/...

  • Page 53: Connecting The Power Cord

    Hardware Installation and Reference Guide Commissioning  Never assume that power is disconnected from a circuit. Instead, always check.  The power cord is plugged into the power module and retained there.  The power cord is long enough to avoid over-extension. ...
  • Page 54 Hardware Installation and Reference Guide Commissioning Figure 4-1 Configuration Environment Device Console port Serial port Console cable The first login to the device must be performed through the console port. (1) Connect the serial port of a PC to the console port of the device with a standard RS-232 cable. (2) Set up a local configuration environment through the console port on the front panel.

  • Page 55: Powering On The Device

    Hardware Installation and Reference Guide Commissioning Click Open to set up the connection. (4) After setting up the configuration environment, power on the device. If the device is already configured with a password, a notification will appear. Click Accept, and enter your username and password for connection.

  • Page 56: Power-On

    Hardware Installation and Reference Guide Commissioning  The input voltage follows the requirement.  Check whether the cable is properly connected, whether the terminal such as a PC is started, and whether terminal parameters are configured. 4.2.2 Power-on Turn off the circuit breaker at the power supply end and set the power switch of the chassis to 4.2.3 Checklist Before Power-on ...

  • Page 57: Monitoring And Maintenance

    Hardware Installation and Reference Guide Monitoring and Maintenance Monitoring and Maintenance Monitoring 5.1.1 Monitoring the LEDs Each module installed in the chassis features a LED, which can be used to monitor the status 1 Overview of each module while the switch is running. See for details.

  • Page 58: Maintenance

    Hardware Installation and Reference Guide Monitoring and Maintenance Maintenance 5.2.1 Replacing the Power Module The power failure will be prompted through monitoring signals. In the case of a power failure, contact your distributor or technical support team. Installing and Removing the Power Module for procedure.

  • Page 59: Replacing The Fuse

    Hardware Installation and Reference Guide Monitoring and Maintenance Danger  There is the danger of explosion if the battery is replaced incorrectly. Replace the battery only with the same or equivalent type recommended by the manufacturer.  Dispose the replaced lithium battery properly. Subjecting the battery to extremely high temperatures, extremely low air pressure, fire, or microwave oven may cause flammable liquid or gas leakage or even the danger of explosion.

  • Page 60: Troubleshooting

    Hardware Installation and Reference Guide Troubleshooting Troubleshooting Flowchart The equipment is not working properly. Check whether the rack is installed properly. Check whether the chassis is mounted on the rack properly. Check whether the power cord is connected properly. Check whether the power module is installed properly.

  • Page 61: Common Issues

    Hardware Installation and Reference Guide Troubleshooting Common Issues 6.2.1 Forgetting Login Password Symptom The login password is forgotten. Handling Method Contact technical support team. 6.2.2 AC Power Module Failure Symptom All LEDs on the front panel are off. The fan status LED is off, and the fan does not rotate. Handling Method Unplug the power cord from the power module.

  • Page 62: Garbled Output On The Console

    Hardware Installation and Reference Guide Appendix 6.2.5 Garbled Output on the Console Symptom The console output is garbled. Handling Method The fault is related to the serial port configuration. Check whether baud rate configuration is consistent with that in Configuration Guide. 6.2.6 Optical Port Linkdown Symptom...

  • Page 63: Pasting Labels

    Hardware Installation and Reference Guide Appendix 7.1.2 Pasting Labels Fill in the label content on the full-page label paper before attaching the label, and then paste it on the power cord or signboard wire buckle. (1) Label pasting position Paste the label 2 cm (0.79 in.) away from the plug. In some specific situations, avoid cable bending or the position that affects power cord installation.

  • Page 64: Label Contents

    Hardware Installation and Reference Guide Appendix Figure 7-2 Signal Cable Labeling Procedure 7.1.3 Label Contents The contents of the two sides of the label identify the location of the ports connected to the two ends of the power cord. Fill in the label according to the specific environment. (1) Fill the content of the local end of the cord location in area ①.

  • Page 65: Connectors And Media

    Hardware Installation and Reference Guide Appendix Connectors and Media 7.2.1 100BASE-TX/10BASE-T Port Table 7-1 100BASE-TX/10BASE-T Pin Assignment MDI Mode MDI-X Mode Output Transmit Data+ Input Receive Data+ Output Transmit Data– Input Receive Data-– Input Receive Data+ Output Transmit Data+ Input Receive Data– Output Transmit Data–...
  • Page 66 Hardware Installation and Reference Guide Appendix Figure 7-5 Cable Connection Modes and Signals Table 7-2 1000BASE-T Pin Assignment MDI Mode MDI-X Mode Media Dependent Interface A+ Media Dependent Interface B+ Media Dependent Interface A– Media Dependent Interface B– Media Dependent Interface B+ Media Dependent Interface A+ Media Dependent Interface C+ Media Dependent Interface D+...

  • Page 67: Surge Protection

    Hardware Installation and Reference Guide Appendix Figure 7-6 1000BASE-T Twisted Pair Connections Surge Protection 7.3.1 Installing an AC Power Arrester When an AC power cord from outdoors is directly plugged into the power port of the switch, the AC power connector must be connected to an external surge protector power strip to protect the switch against lightning strikes.
  • Page 68 Hardware Installation and Reference Guide Appendix Figure 7-7 Power Arrester Note The power arrester does not come with the equipment. Please purchase it based on actual requirements. Important points:  Make sure that the PE terminal of the power arrester is well grounded. ...

  • Page 69: Installing An Ethernet Port Arrester

    Hardware Installation and Reference Guide Appendix 7.3.2 Installing an Ethernet Port Arrester Please connect an Ethernet port arrester to the switch to prevent the damage by lightning before connecting an outdoor network cable to the switch. Tools: Phillips screwdrivers or flat-head screwdriver, multimeter, and diagonal pliers Procedure: (1) Tear one side of the protective paper for the double-sided adhesive tape and paste the tape to the enclosure of the Ethernet port arrester.

  • Page 70: Site Selection

    Hardware Installation and Reference Guide Appendix Caution is needed to avoid the following cases:  Reversed installation direction of the arrester. Connect the external network cable to the IN end and connect the Ethernet port of the switch to the OUT end. ...

  • Page 71: Recommended Cabling

    Hardware Installation and Reference Guide Appendix wall or window, take proper sealing measures. Ensure that the wall is flat, wear-resistant, and dust-free, which should be up to the standard for flame retarding, soundproofing, heat absorption, dust reduction, and electromagnetic shielding. ...
  • Page 72 Hardware Installation and Reference Guide Appendix Figure 7-9 Bundling Up Cables (1)  Cables of different types (such as power cords, signal cables, and grounding wires) should be separated in cabling and bundling. Mixed bundling is not allowed. When they are close to each other, you are advised to adopt crossover cabling.
  • Page 73 Hardware Installation and Reference Guide Appendix will be bent, as shown in Figure 7-11. Figure 7-11 Bundling Up Cables (3)  Cables not to be assembled or remaining parts of cables should be folded and placed in a proper position of the rack or cable trough. The proper position refers to a position that does not affect switch performance or damage the switch or cable.
  • Page 74 Hardware Installation and Reference Guide Appendix  Do not use self-tapping screws to fasten terminals.  Power cords of the same type and in the same cabling orientation should be bundled up into one cable bundle. The power cords in the bundle should be clean and straight. ...

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