Cisco 1805 DOCSIS Cable Router Hardware Installation Guide
Troubleshooting the Cisco 1805 DOCSIS Cable Router
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Troubleshooting the Cisco 1805 DOCSIS Cable Router

Table Of Contents

Troubleshooting the Cisco 1805 DOCSIS Cable Router

Problem Solving

Troubleshooting the Power and Cooling Systems

Normal Indications

Fault Indications

Environmental Reporting Features

Troubleshooting Cables, Connections, and Interface Cards

Reading LEDs

System Messages

Recovering a Lost Password

More Troubleshooting Help


Troubleshooting the Cisco 1805 DOCSIS Cable Router


If you encounter problems with your Cisco 1805 DOCSIS cable router, the information in this chapter can help you isolate problems in the router or eliminate the router as the source of the problem.

This chapter contains the following sections:

Problem Solving

Reading LEDs

System Messages

Recovering a Lost Password

More Troubleshooting Help

If you cannot locate the source of the problem, contact a Cisco customer service representative for information on how to proceed. For technical support information, see the "Obtaining Documentation, Obtaining Support, and Security Guidelines" section on page -xii. Before you call a technician, have the following information ready:

Chassis type and serial number

Maintenance agreement or warranty information

Type of software and version number

Date you received the router

Brief description of the problem

Brief explanation of the steps you have taken to isolate the problem

Problem Solving

The key to problem solving is to isolate the problem to a specific subsystem by comparing what the router is doing to what it should be doing.

The LEDs on the router aid you in determining router performance and operation. The LEDs are described in the "Reading LEDs" section.

When solving problems, consider the following router subsystems:

Power and cooling systems—External power source, power cable, router power supply, circuit breaker, and router fan. Also check for inadequate ventilation or air circulation.

Interface cards—LEDs on the interface cards help identify a failure.

Cables—External cables that connect the router to the network.

Troubleshooting the Power and Cooling Systems

Both the system LED and the fans can help you troubleshoot a power problem. Check the following items to help isolate the problem.

Normal Indications

With the power switch on, the normal indications are:

SYS PWR LED on, green and continuous

Fan operating

Fault Indications

Check the following symptoms to locate or eliminate faults in the power and cooling systems:

With the power switch on, is the SYS PWR LED on?

If the LED is green and continuous, the router is receiving power and is functional.

If the LED is off, check the power source and power cable.

With the power switch on and the SYS PWR LED on and green, does the fan operate?

If no, check the fan.

If yes, the power system is functioning.

With the power switch on and the SYS PWR LED off, does the fan operate?

If yes, the router is receiving power. The fan is connected directly to the DC outputs of the power supply.

If no, check the power source and power cable.

Does the router shut down after being on a short time?

Check for an environmentally induced shutdown. See the next section, "Environmental Reporting Features."

Check the environmental site requirements in the "General Site Requirements" section on page 2-3.

Check for a power supply failure by inspecting the SYS PWR LED on the front panel. If it is green, the power supply is functional.

Router partially boots, but LEDs do not go on.

Check for a power supply failure by inspecting the SYS PWR LED on the front panel of the router. If the SYS PWR LED is blinking or continuously green, the power supply is functional.

If the SYS PWR LED is not on, see the "Cisco One-Year Limited Hardware Warranty Terms" section on page xi for warranty information.

Environmental Reporting Features

If the router is operating at an abnormally high temperature, consider the following causes:

Fan failure

Air conditioner failure in the room

Air blockage to cooling vents

Take steps to correct the problem. see the "Preinstallation Requirements and Planning for Cisco 1805 DOCSIS Cable Routers" chapter.

Troubleshooting Cables, Connections, and Interface Cards

Network problems can be caused by cables, cable connections, or interface cards, or by external devices such as a modem, transceiver, hub, wall jack, WAN interface, or terminal. Check for the following symptoms to help isolate the problem.

Card is not recognized by the router.

Make sure that the card is firmly seated in its slot.

Check the LEDs on the card.

Make sure that you have a version of the the Cisco IOS software that supports the card.

Card is recognized, but interface ports do not initialize.

Make sure that the card is firmly seated in its slot.

Check external cable connections.

Make sure that you have a version of the Cisco IOS software that supports the card. Check the software requirements for the affected card, which can be found in the configuration note for the card.

Router does not boot properly, or constantly or intermittently reboots.

Make sure that the card is firmly seated in its slot.

Check the router chassis or software.

Router boots, but the console screen is frozen.

Check the external console connection.

Verify that the parameters for your terminal are set as follows:

(a) The same data rate as configured for the router (9600 baud is the default)

(b) 8 data bits

(c) 1 stop bit

(d) No parity generated or checked

Router powers on and boots only when a particular card is removed.

Check the card. see the "Cisco One-Year Limited Hardware Warranty Terms" section on page xi and the "Obtaining Documentation, Obtaining Support, and Security Guidelines" section on page xii for warranty and customer service contact information.

Router powers on and boots only when a particular cable is disconnected.

There may be a problem with the card or cable. See the "Cisco One-Year Limited Hardware Warranty Terms" and the "Obtaining Documentation, Obtaining Support, and Security Guidelines" sections of the Product Overview chapter for warranty and customer service contact information.

Reading LEDs

The LEDs on the router enable you to determine router performance and operation. The System Power (SYS PWR) LED and the System Activity (SYS ACT) LED are on the front panel; all the other LEDs are on the back panel.

Table 7-1 LED Indicators on Cisco 1805 Cable Routers 

LED Indicator
State
Meaning
Possible Causes and Corrective Actions

SYS PWR

Off

No output from the internal
power supply.

Power not switched on at the router.

Power not available from source.

Faulty input power wires or
connections.

Failed power supply in the router. To
replace the internal power supply,
call your Cisco technical support
representative.

Solid green

Router is receiving power, and
the internal power supply is
functional.

Normal indication. No action is
required.

Blinking green

During bootup, router is
booting up normally.

Normal indication. No action is
required.

After bootup, router is
operating in ROM monitor
mode.

See the router rebooting and
ROM monitor information in the
Cisco 1800 series software
configuration documentation.

SYS ACT

Off

No packet transfers are
occurring.

Interface card connections are not
functional.

Router is not configured properly.
Check configuration, and make
corrections as necessary.

Blinking

System is actively transferring
packets and monitoring
internal activity

Normal indication. No action is
required.

CF
(CompactFlash Busy)

Off

The CompactFlash memory
card is not being accessed.

Normal indication. No action is
required. It is okay to remove the
CompactFlash memory card if the
CF LED remains off.

Blinking green

The CompactFlash memory
card is being accessed.

Normal indication. No action is
required.


Caution Do not remove the
CompactFlash memory
card while it is being
accessed.

FDX

Off

Fast Ethernet port next to the
LED is operating in
half-duplex mode.

Indication is for information only.

Solid green

Fast Ethernet port next to the
LED is operating in full-duplex
mode.

Indication is for information only.

100

Off

Fast Ethernet port next to the
LED is operating at 10 Mbps.

Indication is for information only.

Solid green

Fast Ethernet port next to the
LED is operating at 100 Mbps.

Indication is for information only.

Link

Off

Fast Ethernet link is not
established at the Ethernet port
next to the LED.

Ethernet is not active or is not
connected. Check Ethernet
connections.

Router is not configured properly.
Check configuration, and make
corrections as necessary.

Solid green

Fast Ethernet link is established at the Ethernet port next to the LED.

Normal indication. No action is
required.

AIM

(Advanced
integration
module)

Off

No AIM is installed.

Indication is for information only.

Solid green

AIM is recognized by the router
and is initialized.

Normal indication. No action is
required.


System Messages

This section describes system error and recovery messages that may appear when a router is operated. The Cisco IOS software displays system error and recovery messages on an external device console terminal screen. The terminal should display one of the following prompts:

Router> (indicates the user EXEC command mode)

or

Router# (indicates the privileged EXEC command mode)

The Cisco IOS software checks the system condition once every 30 seconds. If a condition still exists, the error message is displayed again; if the error condition has cleared, a recovery message is displayed.

Table 7-2 describes some of the most common system error and recovery messages.

Table 7-2 System Messages 

Error Message
Explanation

%ENVMON-3-FAN_OK: Fan <fan-number> functional now

Explanation:

The cooling fan within the chassis is working.

%ENVMON-3-FAN_FAIL: Fan <fan-number> is malfunctioning

Explanation:

The cooling fan within the chassis is not working.

%CFG-3-CARD_NOT_SUPPORTED: Slot <n>. <Card identification from cookie, including at least card type, version, revision, and serial number>

Explanation:

The card found is not recognized or is not supported in the specified slot.

%CFG-6-UNKNOWN_AIM: AIM module in AIM slot <n> is not supported by this IOS image. Card info: <all TLV PEP data from cookie>

Explanation:

This Cisco IOS image does not have the driver code for the AIM discovered in AIM slot.


Recovering a Lost Password

You can recover a lost enable password, but an enable secret password is encrypted and is not recoverable. If you lose an enable secret password that is configured on your router, you can replace it with a new enable secret password.

For password recovery and replacement procedures, see the Password Recovery Procedures document on Cisco.com

More Troubleshooting Help

For online troubleshooting help, go to the TAC Case Collection Tool and Troubleshooting Assistant.

You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.