Huawei Quidway S3526 Installation Manual
Huawei Quidway S3526 Installation Manual

Huawei Quidway S3526 Installation Manual

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HUAWEI
Quidway S3526 Ethernet Switch
Installation Manual
VRP3.10

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Summary of Contents for Huawei Quidway S3526

  • Page 1 HUAWEI Quidway S3526 Ethernet Switch Installation Manual VRP3.10...
  • Page 2 31041012 Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service. If you purchase the products from the sales agent of Huawei Technologies Co., Ltd., please contact our sales agent. If you purchase the products from Huawei Technologies Co., Ltd. directly, Please feel free to contact our local office, customer care center or company headquarters.
  • Page 3 Copyright © 2003 Huawei Technologies Co., Ltd. All Rights Reserved No part of this manual may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks , HUAWEI, C&C08, EAST8000, HONET,...
  • Page 4: About This Manual

    Routing protocols, QoS/ACL, integrated management, 801.x, VRRP, and system management. Organization Quidway S3526 Ethernet Switch Installation Manual mainly introduces the hardware features, installation, configuration and maintenance of S3526. To avoid any possible device damage and personal injury before the installation and during the installation, please read the manual carefully.
  • Page 5 The chapter introduces the installation of the S3526, module installation, connections of the power cable, grounding wire and the console cable. Chapter 5 Booting and Configuration The chapter introduces the booting process of S3526, including the power-on booting of the switch and the system initialization. Chapter 6 BootROM and Host Software Loading The chapter introduces several means to upgrade the software of S3526.
  • Page 6 Convention Description Boldface Headings are in Boldface. Terminal Display is in Courier New. Courier New II. Command conventions Convention Description Boldface The keywords of a command line are in Boldface. italic Command arguments are in italic. Items (keywords or arguments) in square brackets [ ] are optional. Alternative items are grouped in braces and separated by vertical bars.
  • Page 7 V. Mouse operation Action Description Click Press the left button or right button quickly (left button by default). Double Click Press the left button twice continuously and quickly. Drag Press and hold the left button and drag it to a certain position. VI.
  • Page 8: Table Of Contents

    Installation Manual Quidway S3526 Ethernet Switch Table of Contents Table of Contents Chapter 1 Overview ........................1-1 1.1 Brief Introduction to S3526 Switch..................1-1 1.2 Typical Application of S3526 Switch.................. 1-1 1.2.1 Networking of Ethernet Access in Broadband Residential Quarter ......1-1 1.2.2 Networking of VDSL Access in Broadband Residential Quarter ......
  • Page 9 Installation Manual Quidway S3526 Ethernet Switch Table of Contents 4.3.1 Console Cable......................4-6 4.3.2 Connecting Console Cable ..................4-7 4.4 AUX Cable Connection...................... 4-7 4.4.1 AUX Cable....................... 4-7 4.4.2 Connecting AUX Cable ................... 4-8 4.5 Installation of the Optional Interface Modules ..............4-8 4.6 Post-installation Checklist....................
  • Page 10 Installation Manual Quidway S3526 Ethernet Switch Table of Contents 8.5.1 Introduction......................8-6 8.5.2 Appearance ......................8-6 8.5.3 Module Panel and the Indicators................8-7 8.6 1000Base-LX GL Module ....................8-7 8.6.1 Introduction......................8-7 8.6.2 Appearance ......................8-7 8.6.3 Module Panel and the Indicators................8-8 8.7 Stack Module ........................
  • Page 11: Chapter 1 Overview

    1.1 Brief Introduction to S3526 Switch Quidway S3526 Ethernet Switch is a layer-2/layer-3 wire-speed Ethernet switching product delivered by Huawei Technologies Co., Ltd. (hereafter referred to as Huawei). The switch is of modular design and supports stacking. Based on the VRP (Versatile...
  • Page 12: Networking Of Vdsl Access In Broadband Residential Quarter

    Installation Manual Quidway S3526 Ethernet Switch Chapter 1 Overview Core layer Core layer devices devices backbone backbone Data Data center center Convergence layer Convergence layer devices devices Local service Local service center center Access layer Access layer S3526 S3526 devices...
  • Page 13: Networking Of Medium And Small-Sized Enterprises & Branches Of Large Enterprises

    Installation Manual Quidway S3526 Ethernet Switch Chapter 1 Overview MAN backbone Data center S3526 S6000V S3026V 1805 VDSL Modem Figure 1-2 Networking of VDSL access 1.2.3 Networking of Medium and Small-Sized Enterprises & Branches of Large Enterprises In medium and small-sized enterprises and the branches of large enterprises, S3526 switch can be used as backbone switch and connected to the headquarters or the network of other branches via the routers.
  • Page 14: Networking Of Large Enterprise And Campus

    Installation Manual Quidway S3526 Ethernet Switch Chapter 1 Overview Internet/Enterprise network GE(1000M) server FE(100M) S3526 server FE(100M) S2403 S3026 Figure 1-3 Networking of medium and small-sized enterprises and the branches of large enterprises 1.2.4 Networking of Large Enterprise and Campus...
  • Page 15 Installation Manual Quidway S3526 Ethernet Switch Chapter 1 Overview server L2/L3 100M/1000M Enterprise backbone L2/L3 100M/1000M server S3526 Department server GE(1000M) Server cluster server L2/L3 100M/1000M S3526 server S3526 FE(100M) S2403/S3026 10M/100M desktop Figure 1-4 Networking of large enterprise network and campus network...
  • Page 16: Chapter 2 Specifications And Features

    Installation Manual Quidway S3526 Ethernet Switch Chapter 2 Specifications and Features Chapter 2 Specifications and Features 2.1 S3526 Switch Figure 2-1 S3526 Ethernet Switch 2.2 Front Panel of S3526 Switch Note: The DC chassis and AC chassis have the same front panel.
  • Page 17: Ethernet Interface

    Installation Manual Quidway S3526 Ethernet Switch Chapter 2 Specifications and Features Table 2-1 Front panel indicators of S3526 Ethernet Switch Indicator Panel indication Status Description The switch is powered on. Power indicator POWER The switch is powered off. The connection is normal.
  • Page 18: Rear Panel Of S3526 Switch

    Installation Manual Quidway S3526 Ethernet Switch Chapter 2 Specifications and Features Table 2-3 Console port attribute Attribute Description Type of connector RJ-45 Standard of interface Asynchronous EIA/TIA-232 Baud rate 9600bps (default ) Connected to character terminal Services supported Connected to the serial port of local PC via Modems and runs the terminal...
  • Page 19: Optional Interface Module

    Installation Manual Quidway S3526 Ethernet Switch Chapter 2 Specifications and Features LINK LINK ACTIVE ACTIVE DC power socket Grounding screw DC power switch Figure 2-4 Rear panel of S3526 Ethernet Switch DC chassis 2.3.3 Optional Interface Module The types of the optional interface modules supported by S3526 Ethernet Switch are listed in the following.
  • Page 20: System Features Of S3526 Switch

    Installation Manual Quidway S3526 Ethernet Switch Chapter 2 Specifications and Features 2.4 System Features of S3526 Switch Table 2-4 System features of S3526 switch Item S3526 switch Processor MPC8240 200MHz BOOT ROM 512KB SDRAM 64MB(default) Flash Size (W x H x D)
  • Page 21: Chapter 3 Installation Preparation

    Installation Manual Quidway S3526 Ethernet Switch Chapter 3 Installation Chapter 3 Installation Preparation 3.1 Precautions To avoid any device impairment and bodily injury because of improper use, please follow the precautions listed below: Before cleaning the switch, please unplug the switch connector first. Do not clean the switch with wet cloth or with liquid.
  • Page 22: Cleanness Requirement

    Installation Manual Quidway S3526 Ethernet Switch Chapter 3 Installation level in the equipment room is too high for a long time, it will lead to bad insulation of the insulating material or even leakage. Sometimes, the mechanical performance, changes of material, the rustiness and corrosion of some metal parts are also likely to occur.
  • Page 23: Anti-Interference Requirement

    Installation Manual Quidway S3526 Ethernet Switch Chapter 3 Installation 3.2.3 Anti-interference Requirement A switch in use may be affected by the interference sources outside the system in a way of capacitance coupling, inductance coupling, radiation of electromagnetic wave, common impedance (including the grounding system) or conducting line (power line, signaling line and transmission line etc.).
  • Page 24: Installation Tools

    Installation Manual Quidway S3526 Ethernet Switch Chapter 3 Installation 3.3 Installation Tools Phillips screwdriver Flat-blade screwdriver ESD-preventive wrist strap Note: The installation tools are not shipped with S3526 switch. You must ensure the availability of required tools beforehand.
  • Page 25: Chapter 4 Installation

    Chapter 4 Installation Note: On the installation screw of Quidway switches’ chassis, there is an anti-dismantle seal of Huawei Technologies Co., Ltd. The seal must be kept intact before the sales agent performs maintenance to the switch. Therefore, users should contact local agent for permission if it is necessary to open the chassis, otherwise, users should bear the responsibility for possible damages.
  • Page 26: Installing The Switch On The Workbench

    Installation Manual Quidway S3526 Ethernet Switch Chapter 4 Installation Figure 4-1 S3526 Ethernet Switch Installation (mount in a cabinet) Note: The angle iron is used for fixing rather than bearing. When the switch is mounted on a 19-inch standard cabinet, it should be borne by rails (fixed on the cabinet).
  • Page 27: Ac Power Supply And Power Cords

    Installation Manual Quidway S3526 Ethernet Switch Chapter 4 Installation 4.2.1 AC Power Supply and Power Cords I. AC power Caution: If an outdoor AC power cord should be directly led to the switch, please serially connect the lightning arrester for AC Power (Socket Strip with Lightning Protection) before you plug AC power cord into the switch, thus to prevent the possible damage to the switch due to lightning strike.
  • Page 28: Dc Power Supply And Power Cords

    Installation Manual Quidway S3526 Ethernet Switch Chapter 4 Installation Neutral point Zero line Live line Figure 4-3 Recommended AC power socket III. Connecting AC power cord Step 1: Connect one end of the ground wire of the chassis that is shipped with the switch to the grounding screw on the switch rear panel, and properly ground the other end as near as possible.
  • Page 29: Ground Wire

    Installation Manual Quidway S3526 Ethernet Switch Chapter 4 Installation Note: S3526 Ethernet Switch with DC power input has a power switch on its panel. II. Connecting DC power cord Step 1: Connect one end of the ground wire of the chassis that is shipped with the switch to the grounding screw on the switch rear panel, and properly ground the other end.
  • Page 30: Console Cable Connection

    Installation Manual Quidway S3526 Ethernet Switch Chapter 4 Installation Connect chassis grounding screw to the ground with a ground wire, and make sure that the ground resistance is not greater than 5ohm. If the switch is installed in a standard 19-inch cabinet, the cabinet should be grounded in the same way.
  • Page 31: Connecting Console Cable

    Installation Manual Quidway S3526 Ethernet Switch Chapter 4 Installation 4.3.2 Connecting Console Cable While configuring the switch at the configuration terminal, connect the console cable as described below: Step 1: Plug the console cable’s DB-9/25 connector to the serial port of the PC or the terminal where the switch is to be configured.
  • Page 32: Connecting Aux Cable

    Installation Manual Quidway S3526 Ethernet Switch Chapter 4 Installation Enlarged A side Pos.1 DB25 Male 8P8C PLUG Enlarged B side Label Pos.1 Pos.8 Enlarged C side Pos.9 DB9 Male Pos.25 Pos.1 Figure 4-7 AUX cable Table 4-2 AUX cable pinouts...
  • Page 33 Installation Manual Quidway S3526 Ethernet Switch Chapter 4 Installation The power to be used is consistent with that labeled on the switch. The ground wire is connected. The Console cable and power input cable are connected properly. Check if all the interface cabling is performed indoors and there is no outdoor cabling.
  • Page 34: Chapter 5 Booting And Configuration

    Installation Manual Quidway S3526 Ethernet Switch Chapter 5 Booting and Configuration Chapter 5 Booting and Configuration 5.1 Setting Up Configuration Environment The procedures for setting up the configuration environment are described in the following paragraphs (the following figure is given as an illustration):...
  • Page 35 Installation Manual Quidway S3526 Ethernet Switch Chapter 5 Booting and Configuration Set the baud rate to 9600, the data bits to 8, parity check to none, stop bit to 1, flow control to none, and terminal emulation to VT100. The specific means is as follow:...
  • Page 36 Installation Manual Quidway S3526 Ethernet Switch Chapter 5 Booting and Configuration Figure 5-3 Setting the serial port to be used in HyperTerminal connection Click <OK> after the serial port is selected and the system will pop up the following interface. Set the baud rate to 9600, data bit to 8, no parity check, stop bit to 1, and...
  • Page 37 Installation Manual Quidway S3526 Ethernet Switch Chapter 5 Booting and Configuration Figure 5-4 Setting serial interface parameters Click <OK> when the serial interface parameters are set and the system will enter the following interface. Figure 5-5 HyperTerminal...
  • Page 38: Booting S3526 Switch

    Installation Manual Quidway S3526 Ethernet Switch Chapter 5 Booting and Configuration Select [Properties] in the Hyper Terminal dialog box to enter the property window. Click [Settings] in the property setting window as the following figure and select the emulation terminal to VT100. Click <OK> when the selection is done.
  • Page 39: Power On The Switch

    After the switch is powered on, first run the BOOTROM program. The terminal display provides the following output: starting…. ************************************************ Quidway S3526 BOOTROM, Version 2.00 ************************************************ Copyright(C) 2000-2002 by HUAWEI TECHNOLOGIES CO.,LTD. Creation date: Oct 26 2001, 16:57:31 CPU type...
  • Page 40 Installation Manual Quidway S3526 Ethernet Switch Chapter 5 Booting and Configuration II. System auto-booting Note: System will enter the auto-booting status if no operations are performed or no keys except <Ctrl+B> are keyed in within 5 seconds of appearing “ Press Ctrl-B to enter Boot Menu…”.
  • Page 41: Chapter 6 Bootrom And Host Software Loading

    Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading Chapter 6 BootROM and Host Software Loading 6.1 Introduction to Loading Approaches This chapter introduces how to load BootROM and host software for a switch at the local and the remote.
  • Page 42: Boot Menu

    After being powered on, the switch runs the BootROM program first and displays the following information on the screen: starting…. ************************************************ Quidway S3526 BOOTROM, Version 2.00 ************************************************ Copyright(C) 2000-2002 by HUAWEI TECHNOLOGIES CO.,LTD. Creation date: Oct 26 2001, 16:57:31 CPU type...
  • Page 43: Loading Software From Console Port Using Xmodem

    Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading Caution: Please remember the BootROM password you have modified when using the switch. BOOT MENU 1. Download application file to flash 2. Select application file to boot 3.
  • Page 44 Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading 2. Set FTP protocol parameter 3. Set XMODEM protocol parameter 0. Return to boot menu Step 2: Press <3> in the loading menu, choosing to download the BootROM program using XModem.
  • Page 45 Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading Figure 6-1 “Properties” dialog box Figure 6-2 “Console Port Configuration” dialog box...
  • Page 46 Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading Step 6: Click <Disconnect> to disconnect the HyperTerminal from the switch and then click <Connect> to re-establish the connection, thus validating the baud rate setting. Figure 6-3 <Disconnect> and <Connect>...
  • Page 47 Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading Figure 6-5 “Sending File” Interface After completing the loading, the system displays the following information: Loading ...CCCCCCCCCC done! ## Total Size = 0x00055d40 = 351552 Bytes Your baudrate should be set to 9600 bps again! Press enter key when ready.
  • Page 48: Loading Software From Ethernet Port Using Tftp

    Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading 0. Return to boot menu← Enter your choice(0-3):3 The subsequent steps and those of loading BootROM are the same, except of the prompt messages. 6.2.3 Loading Software from Ethernet Port Using TFTP I.
  • Page 49: Loading Software From Ethernet Port Using Ftp

    Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading Step 4: In the download protocol menu, press <1>to select TFTP protocol to download BootROM or host software. Press <Enter>. The system displays the following information: Load File name Switch IP address ←(This address and the IP address of the PC storing the files to be downloaded must...
  • Page 50 Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading II. Loading BootROM Step 1: Select an Ethernet port on the switch for loading and connect it to the PC storing the files to be downloaded. (You should know PC’s IP address). Besides, connect the switch to an external PC via Console port.
  • Page 51: Remote Software Loading

    Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading III. Loading host software Follow these steps to download the host software: Step 1: Select <1> in Boot Menu. The system displays the following information: 1. Set TFTP protocol parameter 2.
  • Page 52: Remote Loading Using Tftp

    Installation Manual Quidway S3526 Ethernet Switch Chapter 6 BootROM and Host Software Loading Step 2: Load BootROM. <Quidway> boot bootrom SWITCH.btm please wait ... Bootrom is updated! Step 3: Load the host software. <Quidway> boot boot-loader SWITCH.app <Quidway> display boot-loader The app to boot at the next time is: flash:/SWITCH.app...
  • Page 53: Dealing With Missing Of Password

    Huawei Technologies Co., Ltd. for help. 6.5 Dealing with Missing of Password Please contact the local agent of Huawei Technologies Co., Ltd. if the BootROM password or user password of the switch is lost.
  • Page 54: Chapter 7 Troubleshooting

    Installation Manual Quidway S3526 Ethernet Switch Chapter 7 Troubleshooting Chapter 7 Troubleshooting 7.1 Power System Failure You can check and verify whether power system of S3526 switch has failed by observing the power indicators on the front panel. The POWER indicator is always on when the system is normal;...
  • Page 55: Chapter 8 Optional Interface Modules

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules Chapter 8 Optional Interface Modules Warning: Before performing installation and removal of optional interface module, please make sure that the switch is powered off to avoid damage to the components.
  • Page 56 Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules Step 1: Wear ESD-preventive wrist strap to disconnect the power of the switch. Note: S3526 Ethernet Switch with AC power input is not shipped with power switch. Please directly turn off the switch of the external power supply when the power-off is required.
  • Page 57: 1000Base-Sx/Lx Module

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules 8.3 1000Base-SX/LX Module 8.3.1 Introduction 1000Base-SX module provides one GE multi-mode optical interface. 1000Base-LX module provides one GE single-mode optical interface. 1000Base-SX/LX module interface supports GE full duplex mode.
  • Page 58: Module Panel And The Indicators

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules Table 8-2 1000Base-SX module 8.3.3 Module Panel and the Indicators 1000Base-SX module panel is illustrated in the following figure. Class 1 Laser Product LINK 1000BASE-SX ACTIVE MM MODULE Figure 8-1 1000Base-SX module panel The description of the panel indicators is given in the following table.
  • Page 59: Appearance

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules Table 8-4 Interface attributes of 1000Base-T module Attribute Description Type of connector RJ-45 1000Mbps full duplex Functions MDI/MDI-X auto sensing Cable and transmission distance 100m transmission distance when Category-5 twisted pair is selected.
  • Page 60: 1000Base-Zx Module

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules Table 8-5 Meaning of indicators on 1000Base-T module panel Indicator State LINK Off means the line is not connected. On means the line is connected. Off means no data is being received or sent. Blinking means there is data being received and ACTIVE transmitted.
  • Page 61: Module Panel And The Indicators

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules 8.5.3 Module Panel and the Indicators 1000Base-ZX module panel is illustrated in the following figure. Class 1 Laser Product LINK ACTIVE 1000BASE-ZX GZ MODULE TX RX Figure 8-5 1000Base-ZX module panel The description of the panel indicators is given in the following table.
  • Page 62: Module Panel And The Indicators

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules Figure 8-6 1000Base-LX GL module 8.6.3 Module Panel and the Indicators 1000Base-LX GL module panel is illustrated in the following figure. Class 1 Laser Product LINK ACTIVE 1000BASE-LX GL MODULE Figure 8-7 1000Base-LX GL module panel The description of the panel indicators is given in the following table.
  • Page 63: Appearance

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules Table 8-10 Interface attributes of stack module Attribute Description Type of connector Specially designed connector Number of interfaces Functions 1000M full duplex Cable and transmission distance Stack cable with the length of 1m.
  • Page 64: Connection Of Module Interface Cable

    Installation Manual Quidway S3526 Ethernet Switch Chapter 8 Optional Interface Modules 8.7.4 Connection of Module Interface Cable I. Interface cable for stack module The interface cable for stack module is a type of dedicated cable, which is one meter long.
  • Page 65: Appendix A Knowledge Of Optical Fiber

    Installation Manual Quidway S3526 Ethernet Switch Appendix A Knowledge of Optical Fiber Appendix A Knowledge of Optical Fiber The center of optical fiber is a light transmission glass core, clad by a glass packet with lower refractive index so to keep the optical fiber within the core. Outside, there is a thin plastic shield to protect the packet.
  • Page 66 Installation Manual Quidway S3526 Ethernet Switch Appendix A Knowledge of Optical Fiber Figure A-1 MT-RJ connector SC connector Figure A-2 SC connector LC connector Figure A-3 LC connector...
  • Page 67: Appendix B Rj-45 Connector

    Installation Manual Quidway S3526 Ethernet Switch Appendix B RJ-45 Connector Appendix B RJ-45 Connector S3526 Ethernet Switch adopts RJ-45 connectors for the 10Base-T/100Base-TX and 1000Base-T interfaces. Figure B-1 illustrates the appearance of RJ-45 connector and the pinout arrangement. Table B-1 lists the electrical property RJ-45 connector pinout in MDI mode.
  • Page 68 Installation Manual Quidway S3526 Ethernet Switch Appendix B RJ-45 Connector Table B-2 RJ-45 MDI-X interface pinout assignment 10Base-T/100Base-TX 1000Base-T Pinout Signal Function Signal Function Receive data BIDB+ Bi-directional data wire B+ Receive data BIDB- Bi-directional data wire B- Send data...
  • Page 69: Appendix C Lightning Protection Of Switches

    Installation Manual Quidway S3526 Ethernet Switch Appendix C Lightning Protection of Switches Appendix C Lightning Protection of Switches C.1 Installation of Lightning Arrester for Power (Socket Strip with Lightning Protection) Caution: Lightning arrester will not be shipped with the equipment. You should purchase it by yourself as needed.
  • Page 70: Installation Of Lightning Arrester For Network Port

    Installation Manual Quidway S3526 Ethernet Switch Appendix C Lightning Protection of Switches Caution: 1) Make sure that the PE terminal is well grounded before using the lightning arrester for power. 2) Insert the AC power plug of switch into the socket of lightning arrester for power (socket strip with lightning protection).
  • Page 71 Installation Manual Quidway S3526 Ethernet Switch Appendix C Lightning Protection of Switches II. Installation procedure Step 1: Tear the protection paper at one side of the double faced adhesive tape apart from the tape, and stick the tape on the surface of the lightning arrester for network port.
  • Page 72 Installation Manual Quidway S3526 Ethernet Switch Appendix C Lightning Protection of Switches III. Installation precautions Fully consider the following items in the installation process, otherwise, the performance of the lightning arrester for network interface will be affected: Lightning arrester for network interface is installed in reverse direction. In practice, the “IN”...

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