Cisco Systems 1760 manual Troubleshooting Isdn

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Chapter 3 Troubleshooting

 

Problem-Solving

 

Table 3-3 Troubleshooting the Power System (continued)

 

 

Symptom

Possible Solutions

 

 

The router is on, but the PWR LED is

The PWR LED is broken. Return the router to your Cisco

off.

reseller.

 

 

The PWR LED is on, the OK LED is

The router may be malfunctioning. Contact your Cisco reseller.

off, and the router does not pass

 

 

console or EIA data.

 

 

 

 

 

Troubleshooting ISDN

Because ISDN uses many variables and supports many different configurations, it can sometimes cause problems for the router.

Two commands are useful when troubleshooting ISDN:

•For routers with an ISDN S/T WIC, enter the clear interface command to terminate any active ISDN calls and to reset the ISDN BRI interface. Do this for each ISDN port installed in the router:

Router# clear interface bri0/0

Router# clear interface bri1/0

•For routers with an ISDN U WIC, use the clear controller command to terminate any active ISDN calls, to reset the ISDN BRI interface, and to reset the ISDN line between the router and the central office switch. Do this for each ISDN port installed in the router:

Router# clear controller bri0

Router# clear controller bri1

Table 3-4lists troubleshooting methods for ISDN-specific problems that might occur.

 

 

Cisco 1760 Modular Access Router Hardware Installation Guide

 

 

 

 

 

 

78-13342-03

 

 

3-13

 

 

 

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Contents Cisco 1760 Modular Access Router Hardware Installation Guide Page Cisco 1760 Modular Access Router Hardware Installation Guide Page Vii N T E N T SViii Router MemoryDetermining the Configuration Register Value Cards E Organization Audience and ScopeXii Related DocumentationXiii ConventionsSäilytä Nämä Ohjeet Waarschuwing Belangrijke VeiligheidsinstructiesBewaar Deze Instructies Varoitus Tärkeitä TurvallisuusohjeitaAvvertenza Importanti Istruzioni Sulla Sicurezza Conservez CES InformationsWarnung Wichtige Sicherheitshinweise Bewahren SIE Diese Hinweise GUT AUFGuarde Estas Instrucciones TA Vare PÅ Disse InstruksjoneneAviso Instruções Importantes DE Segurança Guarde Estas InstruçõesXvii Varning! Viktiga SäkerhetsanvisningarSpara Dessa Anvisningar Xviii Xix GEM Disse AnvisningerPage Xxi Xxii CommandsObtaining Documentation Convention DescriptionXxiii Cisco.comDocumentation DVD Ordering DocumentationXxiv Documentation FeedbackCisco Product Security Overview Xxv Reporting Security Problems in Cisco ProductsObtaining Technical Assistance PsirtXxvi Submitting a Service RequestCisco Technical Support Website Xxvii Definitions of Service Request SeverityXxviii Obtaining Additional Publications and InformationXxix Xxx Cisco 1760 Router Overview Feature Description Key FeaturesMOD OK LED Ports and LEDsConsole Connector/Slot Label/Color DescriptionPorts EthernetLED Label Color Description System LEDsEthernet LEDs Color Cards Supported LED Meaning WIC/VIC LEDsLED VIC-2FXO VIC-2FXS VIC-2BRI-NT/TE VIC-2DID Slot 1 OK VIC-2FXS VIC-2BRI-NT/TE VIC-2DID VIC-2FXO VIC-2FXS VIC-2BRI-NT/TE VIC-2DID Slot 2 OKSlot 3 OK Router MemoryTypes of Memory Router show version Amounts of MemoryCisco 1760 Router Overview Unpacking the Router Unpacking the RouterAdditional Required Equipment Equipment When You Use ItNT1 Types, refer to the Cisco WAN Interface Cards HardwareCisco 1760 Modular Access Router Hardware Installation Guide Before Installing the Router InstallationMounting the Router in a Rack Bracket Mounting Points Attaching Brackets to the RouterAttaching Brackets for 19- and 24-Inch Racks Attaching the Optional Cable Guide Attaching Brackets to the RackInstallation Connecting the Router to Your Local Network Connecting the Router to Your Local NetworkConnecting the Router to the Local Network Safety Information Installing WICs and VICsRemoving a WIC or VIC Slot Cover Inserting a WIC or VIC in the Router Connecting Power to the Router Connecting Power Verifying the InstallationConnecting a PC Optional Installation StepsConnecting the Console Cable to the Router Connecting a Modem10 Connecting a Modem to the Router Installation Optional Installation Steps Contacting Your Cisco Reseller TroubleshootingDetermining the Configuration Register Value Recovering a Lost PasswordRouter show version Resetting the Router Press Return. The following prompt appears Resetting the Configuration Register Value Resetting the PasswordOK LED Diagnostics Problem-SolvingNumber of Blinks Meaning Troubleshooting WICs and VICsTroubleshooting BRI Voice. The Cisco WAN Interface Cards Hardware Installation Symptom Possible SolutionsInformation for Cisco 1700 Routers document that came Troubleshooting the Power SystemTroubleshooting Isdn Isdn U Symptom Check the Following Possible SolutionsWIC Isdn S/TFan Behavior Use the isdn switch-type commandTroubleshooting Problem-Solving Description Specification Technical SpecificationsOperating Specifications Ethernet Cables Cabling Specifications10BASE-T 100BASE-TX RJ-45 Pin Signal DirectionEthernet Network Cabling Guidelines TX+ RX+DTE Console Cable and AdapterVIC Cables and Pinouts Tip Pin SignalCables and Pinouts for 2-Port Isdn BRI Card Pin Signal DescriptionStraight-through cable Cable NT Interface TE Interface crossoverIsdn BRI NT/TE Safety Information Safety Information Pull the top cover off in this direction Opening the ChassisLocating Modules Installing a DimmFigure C-4 Installing a Dimm Installing a Simm View from side Card Installing a PvdmYou could shock yourself NumberPvdm DSPs Supported VIC CombinationsElectrical connections are made Closing the Chassis VPN Module Parts Before You BeginSafety Warnings Preventing Electrostatic Discharge Damage Opening the Cisco 1760 Chassis Installing the VPN Module in a Cisco 1760 RouterFigure D-1 Removing the Cisco 1760 Chassis Screws Screw Standoff Large connector Installing the VPN ModuleFigure D-4 VPN Module Location Figure D-6 Securing the Standoff to the Router Motherboard Closing the Cisco 1760 Chassis 78-13342-03 Multiflex Trunk Interface Cards Echo Echo Canceler Expansion ModulesAppendix E Appendix E IN-1 D EIN-2 DimmDSP C-7 IN-3 IOSIN-4 SimmIN-5 PvdmIN-6 See WICs
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1760 specifications

The Cisco Systems 1760 series routers are part of Cisco’s popular line of integrated services routers, designed primarily for small to medium-sized businesses and branch offices. The 1760 series was introduced to provide robust connectivity and routing solutions that facilitate secure and reliable networking. Aimed at offering flexibility, these routers integrate multiple functionalities to enhance operational performance.

One of the main features of the Cisco 1760 router is its modularity. It supports various interface and service modules that allow for customization based on specific networking needs. This modular design enables businesses to expand their networking capabilities over time without necessitating a complete hardware overhaul. The router typically comes equipped with two WAN slots and numerous interface options, including Fast Ethernet and serial interfaces.

The 1760 series routers also support advanced security features, providing businesses with a secure environment for their data transmissions. Built-in firewall capabilities, along with support for Virtual Private Network (VPN) protocols, ensure that sensitive information remains protected. Furthermore, the integration of IPsec and MPLS security features assists organizations in maintaining secure and scalable connections across diverse networks.

Another characteristic of the Cisco 1760 is its support for various technologies, including Quality of Service (QoS). QoS functionality allows network administrators to prioritize traffic, ensuring that critical applications receive the bandwidth they require while minimizing latency. This ability is particularly valuable in environments where voice, video, and essential data applications compete for resources.

The router’s ease of management is also noteworthy. With Cisco’s IOS (Internetwork Operating System), the 1760 provides a user-friendly interface allowing for straightforward configuration and monitoring. The simplicity in managing the network devices helps reduce the burden on IT personnel and enhances overall operational efficiency.

Further enhancing the router’s capabilities is its support for voice over IP (VoIP) applications, making it an ideal choice for organizations looking to implement modern telephony solutions. The ability to support multiple voice channels while maintaining adequate data throughput positions the 1760 as an attractive option for businesses transitioning to unified communications.

In summary, the Cisco Systems 1760 series routers exhibit a harmonious blend of modularity, robust security, traffic management, and VoIP support. They effectively meet the demands of modern networking environments, making them a reliable choice for organizations aiming to streamline operations while ensuring secure connectivity. With their adaptable design, these routers can serve as a powerful backbone for enterprise networking needs.
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