Cisco Systems Comprehensive Configuration Guide for Troubleshooting and Features
Page 52

Appendix A Troubleshooting

Problem Solving

•Cables—Ensure that the external cables connecting the router to the network are all secure.

Troubleshooting the Power and Cooling Systems

See Table A-1for information to help you isolate the problem.

Table A-1

Troubleshooting the Power and Cooling Systems

 

 

 

 

 

Symptom

 

Possible Cause

Corrective Action

 

 

 

The power (labeled PWR) LED

The power source is not

Check the DC input.

on the front panel is not on.

connected properly.

Check the DC source.

 

 

 

 

 

Note When the Cisco ASR

 

 

 

901 1G router (DC unit)

 

 

 

is powered ON, it takes

 

 

 

about 30 seconds for the

 

 

 

system LED to turn ON.

 

 

 

 

The router shut down after being

The cause is environmental.

Check for an environmentally

on for only a short time.

 

induced shutdown. (See

 

 

 

“Environmental Reporting

 

 

 

Features” section on page A-2).

 

 

 

 

 

 

The fans do not work; the router

Check the fans.

 

 

overheats and shuts down.

 

 

 

 

 

 

 

The chassis intake and exhaust

Check the chassis intake and

 

 

vents are obstructed.

exhaust vents for obstructions.

 

 

 

Clear any obstructions.

 

 

 

 

 

 

Installation does not meet

Check the environmental site

 

 

environmental site

requirements in the “System

 

 

requirements.

Specifications” on page -7.

 

 

 

The router partially boots, but

There is a possible power supply

Check the power LED on the

the LEDs do not light.

failure.

front panel of the router. If the

 

 

 

LED is on, the power supply is

 

 

 

functional. If the LED is off, refer

 

 

 

to the Cisco Information Packet

 

 

 

for warranty information or

 

 

 

contact customer service.

 

 

 

 

Environmental Reporting Features

The Cisco ASR 901 router has a temperature sensor to detect over temperature conditions inside the chassis. The over temperature detection triggers an alert at 70°C. This condition is reported to the processor as an interrupt, where software takes action to generate the appropriate alarms. If the router reaches a temperature of 85°C, the power supply will cycle to prevent the router from exceeding that temperature while being powered up state. See Table A-2for help in interpreting environmental reporting features.

Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide

 

A-2

OL-23778-01

 

 

 

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Contents Cisco Systems, Inc Page Audience Enter a Directory and Determine the Current Directory Time of Day Pinouts OL-23778-01 Document Revision History Revision Date Change SummaryObjectives AudienceOrganization ConventionsSafety Warnings Related DocumentationOL-23778-01 Introduction Hardware DescriptionCisco ASR 901 Router Front View Cisco ASR 901 Router Ethernet Version Front View Cisco ASR 901 Router-Front ViewCisco ASR 901 Router Rear View Fan Grounding Point LugPower Supply Safety PrecautionsSpecification Value LEDsPin Connector a RTNEnvironmental Monitoring Temperature Sensor System SpecificationsPin Connector B Description SpecificationRouter Interface Numbering Interface Number Location LabelRegulatory Compliance OL-23778-01 Safety Guidelines Safety with EquipmentSafety with Electricity Preventing Electrostatic Discharge Damage Power Supply Considerations PrerequisitesSite Planning Site EnvironmentMethod of Procedure Air Flow GuidelinesUnpacking and Checking the Contents of your Shipment Required Tools and EquipmentInstallation Checklist Task Verified byConsole Port Considerations Creating a Site LogConsole Port Connections Task Verified by DatePreparing to Install the Router Console Port Considerations OL-23778-01 Installing the Cisco ASR 901 Mobile Wireless Router Network ModulesRack-Mounting Configuration Guidelines Mounting the Cisco ASR 901 RouterAttaching the Rack-Mounting Brackets Mounting the Cisco ASR 901 Router in a RackAttaching the Cable Guides Rack-Mounting Brackets section onConnecting the Chassis Ground and Power Grounding the Cisco ASR 901 RouterGrounding Point Power Connection Compliance Stripping a Ground WireWiring the DC-Input Power Source 6-Pin Terminal BlockInstalling and Removing SFP Modules Installing SFP ModulesInstalling an SFP Module into an SFP Module Slot Removing SFP ModulesConnecting Cables Connecting the Console PortTypes of RJ-45 Cables Console PortConnecting Gigabit Ethernet Interface Cables Connecting the Network CablesConnecting T1 and E1 Interface Cables Connecting Cables to the Bits Interface Connecting SFP CablesConnecting GPS Cables Powering On the Router Connecting to Alarm PortConnecting to the Management Ethernet Port Dressing Router CablesChecklist for Power Up Power-On ProcedureFormatting Procedures for Flash Memory Interpreting Front-Panel LEDsDisplaying Contents of the Flash Memory File and Directory ProceduresCopying Files Displaying File Content Deleting Files from the Flash MemoryWhat to Do After Installing the Hardware Enter a Directory and Determine the Current DirectoryOL-23778-01 Troubleshooting Problem SolvingEnvironmental Reporting Features Troubleshooting the Power and Cooling SystemsSymptom Possible Cause Corrective Action Troubleshooting Cables, and Connections Information Packet publicationReading the LEDs Chassis LEDsCopper GE from Quad combo PHY ports contain Two Leds each System LEDT1/E1 Interface LEDs SFP Ethernet Interface LEDsRJ-45 Ethernet Interface LEDs Color/State Description two LEDs for each T1/E1 portOL-23778-01 Cable Specifications Gigabit Ethernet Connector PinoutsPin FE Signal GE Signal SFP Port Pinouts and Cable SpecificationsT1/E1 Port Pinouts Console Port Signals and Pinouts Console Port Signals and PinoutsPin Signal Name Direction Description Pin Signal Name HP Pins Direction Description RJ-45-to-DB-9 Terminal Adapter ConsoleIdentifying a Rollover Cable Terminal Adapter Device Signal RJ-45 Pin DB-25 PinConsole RJ-45-to-DB-25 Port DTE Time of Day Pinouts Bits Port PinoutsGPS Port Pinouts Alarm Port Pinouts Pin Signal Name DescriptionManagement Ethernet Port Pinouts 10 MhzRxDP RxDN TxDP Not connected TxDN Site Log Date InitialsNumerics IN-2 IN-3 IN-4

ASR 901 specifications

Cisco Systems ASR 901 is an advanced aggregation services router that is designed to meet the needs of service providers and enterprise networks. It offers a versatile platform suitable for various deployment scenarios ranging from mobile backhaul and broadband aggregation to IP edge routing. The ASR 901 is known for its compact size, energy efficiency, and robust performance, making it a preferred choice for operators looking to enhance their network infrastructure.

One of the main features of the Cisco ASR 901 is its small form factor, which facilitates installation in space-constrained environments. Its design allows for easy deployment in both indoor and outdoor settings, making it ideal for applications such as cell site backhaul and remote locations. The router supports a wide range of interfaces, including Ethernet and T1/E1, providing flexibility in connecting different network types.

The ASR 901 is built on Cisco's IOS XR software, ensuring a highly reliable and secure operating environment. This software is known for its scalability and robustness, providing operators with the ability to support large numbers of subscribers and high traffic volumes. The router also supports system redundancy features, ensuring continuous service availability and minimizing downtime.

In terms of performance, the Cisco ASR 901 delivers high throughput and low latency, which are crucial for delivering quality services like voice, video, and data. With its support for advanced network technologies such as MPLS and IPv6, the ASR 901 can effectively manage complex networking requirements while accommodating future growth.

Security is also a key consideration with the ASR 901. It includes features such as advanced encryption, access control lists, and intrusion prevention systems, aimed at protecting the integrity of network communications. Moreover, its support for Virtual LAN (VLAN) tagging and Quality of Service (QoS) mechanisms allows for efficient traffic management and prioritization, ensuring that critical applications receive the necessary bandwidth.

Furthermore, Cisco provides comprehensive management tools for the ASR 901, allowing network administrators to easily monitor and configure the router. Features like SNMP and NetFlow enable operators to gain insights into network performance and usage patterns, facilitating proactive management of their environments.

Overall, the Cisco Systems ASR 901 stands out as a powerful and flexible router, designed to meet the evolving demands of modern networks. Its combination of compact design, scalability, and advanced features positions it as an ideal solution for service providers and enterprises seeking reliable and efficient network solutions.
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