Cisco CISCO871-K9 - 871 Integrated Services Router

Questions and Answers

A
Antonio GrayJul 31, 2025
Why can't I connect to the Internet with my Cisco CISCO871-K9 - 871 Integrated Services Router?
- J
  Jacob GarciaJul 31, 2025
  There could be several reasons why you cannot connect to the Internet using your Cisco Network Router. First, ensure your broadband modem or external Ethernet switch is properly connected and powered on. Second, there might be an issue with your broadband or WAN service, so check with your Internet service provider. Finally, the router might be improperly configured. Use the Cisco Router and Security Device Manager (SDM) software, or configure the router using a PC connected to the console port.
M
Mr. Patrick BeardAug 6, 2025
What to do if there is no power to my Cisco CISCO871-K9 - 871 Integrated Services Router Network Router?
- J
  James HaynesAug 6, 2025
  If your Cisco Network Router has no power, follow these steps: 1. Ensure the power switch is set to ON. 2. Verify all connections to and from the power supply are secure. 3. Confirm the power outlet has power. If the problem persists, the power supply might be faulty; in that case, contact your Cisco reseller.
S
Shannon WilliamsAug 12, 2025
What to do if my Cisco CISCO871-K9 - 871 Integrated Services Router Network Router has no connection to modem or to Ethernet switch?
- P
  Pamela MillerAug 12, 2025
  If your Cisco Network Router has no connection to the modem or Ethernet switch (WAN LNK LED is off), it might be a cable-related issue. Here's what to do: 1. Make sure that you have cabled the device correctly. 2. Ensure the connectors at both ends of the cable are securely seated. 3. Check the cable for physical damage, and replace it if necessary with a similar cable.
J
james81Aug 17, 2025
How to fix no connection to Ethernet devices on Cisco CISCO871-K9 - 871 Integrated Services Router Network Router?
- L
  Luke TurnerAug 17, 2025
  If your Cisco Network Router has no connection to Ethernet devices (ETHERNET LAN 0, ETHERNET LAN 1, ETHERNET LAN 2, and ETHERNET LAN 3 LEDs are off), it might be a cable problem. Try these steps: 1. Make sure that you have cabled the device correctly. 2. Ensure the connectors at both ends of the cable are securely seated. 3. Check whether the cable is physically damaged, and if it is, replace it with a similar cable.
L
Louis CoxAug 25, 2025
Why is there no connection to xDSL link on my Cisco Network Router?
- O
  oyoungAug 25, 2025
  If there is no connection to the xDSL link on your Cisco Network Router (The WAN LNK LED on the front panel is off for a long time), the cause might be the wrong cable. Make sure that you are using the correct cable.

Summary

Preface

Objective

Explains how to install, maintain, and troubleshoot router hardware.

Audience

Intended for service technicians with little or no experience installing routers.

Organization

Outlines the structure and content of the guide.

Conventions

Describes the conventions used throughout the guide.

Obtaining Documentation and Submitting a Service Request

Provides instructions for obtaining documents and submitting service requests.

CHAPTER 1 Product Overview

General Descriptions of the Router Models

Provides a general description of each router model in the series.

Feature Summary

Summarizes the key hardware features of the routers.

Hardware Features

Details various hardware aspects like serial number, LEDs, memory, and security.

Regulatory Compliance

Points to documents for compliance and safety information.

CHAPTER 2 Preinstallation Information

Safety Warnings and Guidelines

Covers safety warnings and guidelines for installing routers and optional modules.

Preventing Damage to the Router

Provides guidelines to prevent damage to the router during handling and connection.

Unpacking the Box

Lists items shipped with the router and how to verify receipt.

Preparing for Installation

Details tasks to perform before installing and connecting the router.

CHAPTER 3 Router and PoE Module Mounting Procedures

Connecting Antennas to the Wireless Router

Instructions for connecting antennas to the wireless router before mounting.

Mounting on a Table

Describes how to place the router and PoE module on a flat horizontal surface.

Mounting on a Wall

Provides guidelines and steps for mounting the router and PoE module on a wall.

Mounting the PoE Module on a Wall

Specific steps for mounting the PoE module onto a wall.

CHAPTER 4 Router Cabling Procedures

Connecting the Radio Antennas to the Wireless Router

Step-by-step guide for attaching radio antennas to wireless routers.

Connecting a Server, PC, or Workstation

Details how to connect a server, PC, or workstation to the router's Ethernet ports.

Connecting a Broadband Modem

Guides on connecting the router to a broadband modem for internet access.

Verifying Router Operations

How to verify correct router operation using LEDs after connections are made.

CHAPTER 5 Initial Configuration

Installing Cisco Router and Security Device Manager

Steps to install Cisco SDM for initial router configuration.

Initial Configuration Using Cisco SDM

Guide to configuring the router using the Cisco SDM application.

Initial Configuration Using the Setup Command Facility

Describes using the setup command facility for basic router configuration.

Initial Configuration Using the Cisco CLI-Manual Configuration

Instructions for manual router configuration via the command-line interface.

CHAPTER 6 Troubleshooting

Before You Call Your Cisco Reseller

Information to have ready before contacting a Cisco reseller for support.

Problems During First Startup

Lists and provides solutions for problems encountered during the initial power-on.

Problems After the Router Is Running

Lists and provides solutions for problems that occur after the router is operational.

APPENDIX A Specifications

Router Specifications

Outlines the system specifications for the Cisco 850 and 870 series routers.

Power-over-Ethernet Module Specifications

Provides detailed specifications for the optional Power-over-Ethernet module.

LAN Port Pinouts

Details the pin assignments for the router's Ethernet LAN ports.

Ethernet Cable Specifications

Provides specifications for various Ethernet cables that may be needed.