Cisco AS5850 Hardware Installation Guide - Hardware Troubleshooting

Table Of Contents

Hardware Troubleshooting

Problem Solving with Subsystems

Identifying Startup Problems

Troubleshooting the Power Subsystems

Troubleshooting the Cooling Subsystems

Troubleshooting the Processor Subsystems

Troubleshooting the RSC

Troubleshooting the Feature Cards

Troubleshooting Network Interfaces

Hardware Troubleshooting

Your Cisco AS5850 was thoroughly tested before leaving the factory. If you encounter problems initializing system startup, use the information in this chapter to help isolate the cause.

This chapter contains the following sections:

•Problem Solving with Subsystems

•Identifying Startup Problems

•Troubleshooting the Power Subsystems

•Troubleshooting the Cooling Subsystems

•Troubleshooting the Processor Subsystems

•Troubleshooting Network Interfaces

The procedures in this chapter assume that you are troubleshooting the initial hardware configuration and system startup. If you have removed or replaced components or changed any default settings, the recommendations in this chapter might not apply. Review the safety warnings listed in the publication Cisco AS5850 Universal Gateway Regulatory Compliance and Safety Information before using the troubleshooting procedures in this chapter.

If you are unable to resolve the problem, contact a customer service representative (see the "Obtaining Technical Assistance" section on page xiv) for assistance and further instructions. Provide the representative with the following information:

•Date you received the system

•Chassis serial number

•Type of software and release number

•Brief description of the problem

•Brief explanation of the steps you have taken to isolate and resolve the problem

•Maintenance agreement or warranty information

Problem Solving with Subsystems

The key to problem solving is isolating the problem to a specific subsystem. The first step in solving startup problems is to compare what the system is doing to what it should be doing. Try to isolate the problem to one of the following three subsystems:

•Power

•Cooling

•Processor

Start by checking the power components. Power components include the following:

•Power-entry module/filters (PEMFs)

•2400W AC-input power shelf

•Backplane

•External-power cable connection

•External monitor system

Next, check the cooling components. Fans should be operating whenever system power is on. Cooling components include the following:

•Cooling module

•Exhaust

Last, check the server processor cards. Most processor cards contain LEDs that indicate the status of the card. Observing these LEDs can help you isolate the problem to a particular card. (See "Powering On the Cisco AS5850 and Observing Initial Startup Conditions," for LED descriptions and troubleshooting tips.) The system memory and management functions reside on the route switch controller card.

The following sections will help you isolate a problem within one of these subsystems and direct you to the appropriate troubleshooting section.

Identifying Startup Problems

Hardware startup problems are commonly traced to cabling problems or incorrectly installed power supplies or cards. In rare cases, problems are caused by part failures.

When you start up a Cisco AS5850 for the first time, you should observe the startup sequence, described in the following sections. This chapter describes the normal startup sequence for the universal gateway and the steps to take if the system does not perform that sequence as expected.

In most cases, LEDs indicate system states in the startup sequence. By checking these LEDs, you can determine when and where the system failed. Use the following descriptions to isolate the problem to a subsystem, then proceed to the appropriate sections to try to resolve the problem.

Note Although an overtemperature condition is unlikely at initial startup, the environmental monitoring functions are included in this chapter because these functions also monitor internal voltages.

When you first power on the Cisco AS5850, the following should occur:

•Both POWER LEDs of the PEMF front should come on immediately and remain on during normal system operation. If you are using the AC-input power shelf, all 2400W AC-input power module AC OK and DC OK LEDs should come on when power is switched on at the circuit breaker.

If the green power LEDs do not come on, proceed to the section "Troubleshooting the Power Subsystem."

•You should hear the fans operating in the cooling module. The cooling module POWER LED should come on.

If the fans do not operate, proceed to the section "Troubleshooting the Cooling Subsystems."

•The LEDs on the RSC, modem cards, and trunk cards should light as follows:

–RSC card—Powers on first, followed by remaining cards. The PWR LED should come on. The remaining three alarm LEDs should all briefly flash on and then go off.

–T1/E1 or T3 trunk card—At initial power on, all LEDs come on while the system runs a series of diagnostics. After the system passes initial diagnostics, all LEDs go off. The CPU/POWER LED should come on and the FCPU LEDs should be blinking to indicate that the trunk card is operating properly.

–SDH/STM-1 trunk card—At initial power on, all LEDs come on while the system runs a series of diagnostics. After the system passes initial diagnostics, all LEDs go off. The OK/MAINT LED should come on and remain green.

–Port card—At initial power on, all LEDs go on while the system runs a series of diagnostics. After the system passes initial diagnostics, all LEDs go off. The CPU/POWER LED then comes on to indicate that the card is operating properly.

If the processor component LEDs do not come on as described, proceed to the section "Troubleshooting the Processor Subsystems."

Troubleshooting the Power Subsystems

The Cisco AS5850 is designed to minimize problems in the power subsystem. The power subsystem includes the PEMFs and the 2400 W AC-input power shelf (if used).

The Cisco AS5850 comes with two DC power entry modules, which allow you to replace power supplies while the system is operating. However, if you are using an AC-configured system and you discover a faulty PEMF, you must power off the system before performing a replacement.

Caution If your system requires the AC-input power shelf for AC-to-DC conversion, you should schedule a time for system maintenance and replace the PEMF at that time.

The failure of a single PEMF or AC power module, if used, will not stop the universal gateway from operating; however, to maintain power redundancy, both DC PEMFs and all three AC power modules must be receiving power.

Figure 5-1 shows the flow of power for either AC-input or DC-input systems. Understanding this flow can aid in diagnosing power flow problems.

Figure 5-1 Power Distribution

Check the following points in the order given to help isolate a problem with the power subsystem:

•If you are using the AC-input power shelf, are both the AC OK and DC OK LEDs on for at least two power modules?

–If yes, the power source is good and all the power modules are functional.

–If no, verify that the associated AC power cord for the power supply is plugged in and the correct AC voltage (110 to 120 VAC) is present at the source. If the DC OK LED is not on, this suggests that the PEMFs might not be switched on or might be faulty.

–Verify that the AC-input power shelf FAULT LEDs are off.

If a power module FAULT LED comes on, the power shelf has detected an internal fault; the power module is defective. You need to replace the power module.

•Is at least one POWER LED on for the PEMFs on the rear of the server?

–If yes, the power source is good and the PEMF is functional. Verify that the second POWER LED is on for power redundancy.

–If not, verify that the power cable is connected at both ends and check that you have wired the DC-input connections correctly.

If the MISWIRE LED is off, the DC-input connection is wired correctly.

If the MISWIRE LED is on, the two DC conductors entering the PEMF terminal block are reversed. Power off the power at your power source and reverse the connections.

–If neither the POWER nor the MISWIRE LED is on for a given PEMF, check the voltage at the input terminal block. If the voltage reading is not between -40 VDC and -60 VDC, replace the PEMF.

•Is the cooling module POWER LED on?

–If yes, the cooling module is receiving power.

–If not, reseat the connection between the cooling module and the PEMFs: pull the cooling module partway out of the server and then reinsert it in the server.

•Is the RSC POWER LED on?

–If yes, the RSC is receiving power.

–If not, try reseating the RSC in its backplane connection, or try using an RSC card known to be good in the same slot. Also try reseating the PEMFs in their connections to the backplane. If the RSC POWER LED does not come on, the backplane may be faulty. Replace the backplane.

•Do the other server card power LEDs come on?

–If yes, the cards are receiving power.

–If not, the backplane may be faulty. Replace the backplane.

Troubleshooting the Cooling Subsystems

The Cisco AS5850 is designed to minimize problems in the cooling subsystem. The Cisco AS5850 can operate in temperatures of up to 120°F (50°C) for a maximum of 72 hours. The universal gateway also contains redundant fans in the cooling module, which allow the system to continue operating despite a single fan failure. The cooling module can be removed and replaced while the system is operating, provided that the procedure does not exceed 1 minute.

Check the following to help isolate a problem with the cooling system:

•Do all card slots either contain cards or card blanks?

To properly cool the universal gateway, cool air needs to enter through the intake vent, flow up and past the cards, and get pushed out of the server exhaust by the fans in the cooling module (see Figure 5-2). If a card cage slot is left open, air can enter into the chassis through the card cage rather than the intake vent, upsetting the intended air flow. This prevents cards in the card cage from being cooled properly.

Figure 5-2 Airflow

•Do the cooling module fans operate?

To determine whether the fans are operating, listen for them. In noisy environments, place your hand under the exhaust vents on the back of the cooling module to feel for air being forced out the vents. If no air is coming out, there is a problem with the fans or there is a problem with the power to the cooling module.

If you determine that the power supply is functioning normally but a fan is faulty, you can replace the cooling module without powering off the universal gateway. Refer to the cooling module removal instructions in "Preparing for Installation," and the reinsertion instructions in "Installing the Cisco AS5850." For problems with the system power, refer to the section "Troubleshooting the Power Subsystem" in this chapter.

•Is the green power LED on the cooling module front panel on?

If no, verify that the cooling module is fully installed in the server, the connector is firmly connected to the PEMF, and the captive screws are tightened adequately.

•Is a yellow fault LED on the cooling module front panel on?

There are three fault LEDs, one for each bank of fans in the cooling module. If one of these LEDs is on, the newly installed cooling module might be faulty or the Mbus and power connector might be damaged. Shut off system power, remove the cooling module, and check the connectors. If the connectors are in good condition, reinstall the cooling module in the chassis and power ON the system. If the fault LED is still on, assume that the cooling module is faulty. Install another cooling module and return the faulty cooling module to the factory.

•The following error message, if displayed on the console, indicates that the system has detected an overtemperature condition or out-of-tolerance power somewhere in the system.
Queued messages:
%ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown
If an environmental shutdown results from an out-of-tolerance power condition, the POWER LED remains off and the system shuts down. (Refer to the section "Troubleshooting the Power Subsystems" in this chapter.) Although an overtemperature condition is unlikely at initial startup, ensure that heated exhaust air from other equipment is not entering the server's inlet vent and that there is sufficient clearance around the sides of the chassis to allow cooling air to flow. Refer to the "Preventive Site Configuration: Maintaining Normal Operation" section for preventive site configurations.

The previous error message could also indicate a faulty component or temperature sensor. Before the system shuts down, find out exactly which component is experiencing temperature or voltage problems. Use the show environment table command to display the internal power and temperature thresholds, and compare the thresholds with current conditions listed in the output from the show environment command.

Troubleshooting the Processor Subsystems

The processor subsystem consists of the route switch controller card, port cards, and trunk cards in the Cisco AS5850. The following sections contain specific troubleshooting information for each of these components.

The RSC is a required system component. The system cannot operate unless at least one RSC is installed properly; however, the system can operate without any feature cards installed, as long as none are in partial contact with the backplane pins. A server card that is partially connected to the backplane may cause the universal gateway to crash or to hang. Therefore, first ensure that the RSC is installed properly and that the system software has initialized successfully. Then, if necessary, you can troubleshoot individual feature cards.

Troubleshooting the RSC

The following sections describe troubleshooting procedures for the RSC.

These procedures assume that the RSC is in the original factory configuration and that you have not made changes to your configuration file.

If the RSC LEDs do not come on as expected (refer to the section "Identifying Startup Problems" in this chapter), check the following items to help isolate the problem:

•Is the power LED on?

–If yes, the RSC has booted successfully.

–If this LED remains off at system startup, either there is a problem with the PEMF (it is damaged or not connected to the backplane), the backplane, or possibly the LED.

•Do all RSC LEDs remain off when the system powers on?

–If the LEDs remain off, first refer to the sections "Troubleshooting the Power Subsystems" and "Troubleshooting the Cooling Subsystems" in this chapter to ensure that both the cooling module and the DC PEMFs are functioning properly.

–If the power and cooling systems appear operational but none of the RSC LEDs are on, ensure that the RSC is properly connected to the backplane. Power off the system. Remove the RSC, reinsert it, and tighten all captive installation screws, and then restart the system. You might also try switching the slot the RSC is in (from 6 to 7, or 7 to 6). If the problem persists, examining the backplane for bent connector pins. If none are found, contact your service representative (see the "Obtaining Technical Assistance" section on page xiv). You might need to replace the RSC card, or possibly the backplane.

To inspect the backplane pins, first power off the system to avoid hazards caused by high voltages present on the backplane connectors. Next, remove cards in neighboring slots to allow an unimpeded view of the backplane connectors. Then, using a flashlight, verify that the backplane connectors are in good condition. If you discover bent pins, you need a new backplane. Contact your service representative to order a new backplane.

•You can also use the show command to diagnose a problem with the RSC card. Enter the following command:
Router> enable
enter password password
Router# show diag type {shelf | slot}
Ctrl-Z
Troubleshooting the Feature Cards

Troubleshooting information for T1, E1, CT3, or STM1 trunk cards or port cards is available in the Cisco AS5850 Universal Gateway Card Guide that shipped with your system.

Troubleshooting Network Interfaces

For information about isolating problems with the network connections to your universal gateway, refer to the publication Internetwork Troubleshooting Guide, which is available on the Cisco Documentation CD-ROM that shipped with your Cisco AS5850. For more information, see the "Related Documentation" section on page xii.

	Cisco AS5850 Hardware Installation Guide
	Hardware Troubleshooting
Cisco AS5850 Hardware Installation Guide About This Guide Cisco AS5850 Product Overview Preparing for Installation Installing the Cisco AS5850 Powering on the Cisco AS5850 and Observing Startup Conditions Hardware Troubleshooting Cisco AS5850 Specifications Industry-Standard Wiring Plans Cisco AS5850 Packaging Instructions	Download this chapter Hardware Troubleshooting Download the complete book Cisco AS5850 Universal Gateway Hardware Installation Guide (PDF - 3 MB) Feedback Table Of Contents Hardware Troubleshooting Problem Solving with Subsystems Identifying Startup Problems Troubleshooting the Power Subsystems Troubleshooting the Cooling Subsystems Troubleshooting the Processor Subsystems Troubleshooting the RSC Troubleshooting the Feature Cards Troubleshooting Network Interfaces Hardware Troubleshooting Your Cisco AS5850 was thoroughly tested before leaving the factory. If you encounter problems initializing system startup, use the information in this chapter to help isolate the cause. This chapter contains the following sections: •Problem Solving with Subsystems •Identifying Startup Problems •Troubleshooting the Power Subsystems •Troubleshooting the Cooling Subsystems •Troubleshooting the Processor Subsystems •Troubleshooting Network Interfaces The procedures in this chapter assume that you are troubleshooting the initial hardware configuration and system startup. If you have removed or replaced components or changed any default settings, the recommendations in this chapter might not apply. Review the safety warnings listed in the publication Cisco AS5850 Universal Gateway Regulatory Compliance and Safety Information before using the troubleshooting procedures in this chapter. If you are unable to resolve the problem, contact a customer service representative (see the "Obtaining Technical Assistance" section on page xiv) for assistance and further instructions. Provide the representative with the following information: •Date you received the system •Chassis serial number •Type of software and release number •Brief description of the problem •Brief explanation of the steps you have taken to isolate and resolve the problem •Maintenance agreement or warranty information Problem Solving with Subsystems The key to problem solving is isolating the problem to a specific subsystem. The first step in solving startup problems is to compare what the system is doing to what it should be doing. Try to isolate the problem to one of the following three subsystems: •Power •Cooling •Processor Start by checking the power components. Power components include the following: •Power-entry module/filters (PEMFs) •2400W AC-input power shelf •Backplane •External-power cable connection •External monitor system Next, check the cooling components. Fans should be operating whenever system power is on. Cooling components include the following: •Cooling module •Exhaust Last, check the server processor cards. Most processor cards contain LEDs that indicate the status of the card. Observing these LEDs can help you isolate the problem to a particular card. (See "Powering On the Cisco AS5850 and Observing Initial Startup Conditions," for LED descriptions and troubleshooting tips.) The system memory and management functions reside on the route switch controller card. The following sections will help you isolate a problem within one of these subsystems and direct you to the appropriate troubleshooting section. Identifying Startup Problems Hardware startup problems are commonly traced to cabling problems or incorrectly installed power supplies or cards. In rare cases, problems are caused by part failures. When you start up a Cisco AS5850 for the first time, you should observe the startup sequence, described in the following sections. This chapter describes the normal startup sequence for the universal gateway and the steps to take if the system does not perform that sequence as expected. In most cases, LEDs indicate system states in the startup sequence. By checking these LEDs, you can determine when and where the system failed. Use the following descriptions to isolate the problem to a subsystem, then proceed to the appropriate sections to try to resolve the problem. Note Although an overtemperature condition is unlikely at initial startup, the environmental monitoring functions are included in this chapter because these functions also monitor internal voltages. When you first power on the Cisco AS5850, the following should occur: •Both POWER LEDs of the PEMF front should come on immediately and remain on during normal system operation. If you are using the AC-input power shelf, all 2400W AC-input power module AC OK and DC OK LEDs should come on when power is switched on at the circuit breaker. If the green power LEDs do not come on, proceed to the section "Troubleshooting the Power Subsystem." •You should hear the fans operating in the cooling module. The cooling module POWER LED should come on. If the fans do not operate, proceed to the section "Troubleshooting the Cooling Subsystems." •The LEDs on the RSC, modem cards, and trunk cards should light as follows: –RSC card—Powers on first, followed by remaining cards. The PWR LED should come on. The remaining three alarm LEDs should all briefly flash on and then go off. –T1/E1 or T3 trunk card—At initial power on, all LEDs come on while the system runs a series of diagnostics. After the system passes initial diagnostics, all LEDs go off. The CPU/POWER LED should come on and the FCPU LEDs should be blinking to indicate that the trunk card is operating properly. –SDH/STM-1 trunk card—At initial power on, all LEDs come on while the system runs a series of diagnostics. After the system passes initial diagnostics, all LEDs go off. The OK/MAINT LED should come on and remain green. –Port card—At initial power on, all LEDs go on while the system runs a series of diagnostics. After the system passes initial diagnostics, all LEDs go off. The CPU/POWER LED then comes on to indicate that the card is operating properly. If the processor component LEDs do not come on as described, proceed to the section "Troubleshooting the Processor Subsystems." Troubleshooting the Power Subsystems The Cisco AS5850 is designed to minimize problems in the power subsystem. The power subsystem includes the PEMFs and the 2400 W AC-input power shelf (if used). The Cisco AS5850 comes with two DC power entry modules, which allow you to replace power supplies while the system is operating. However, if you are using an AC-configured system and you discover a faulty PEMF, you must power off the system before performing a replacement. Caution If your system requires the AC-input power shelf for AC-to-DC conversion, you should schedule a time for system maintenance and replace the PEMF at that time. The failure of a single PEMF or AC power module, if used, will not stop the universal gateway from operating; however, to maintain power redundancy, both DC PEMFs and all three AC power modules must be receiving power. Figure 5-1 shows the flow of power for either AC-input or DC-input systems. Understanding this flow can aid in diagnosing power flow problems. Figure 5-1 Power Distribution Check the following points in the order given to help isolate a problem with the power subsystem: •If you are using the AC-input power shelf, are both the AC OK and DC OK LEDs on for at least two power modules? –If yes, the power source is good and all the power modules are functional. –If no, verify that the associated AC power cord for the power supply is plugged in and the correct AC voltage (110 to 120 VAC) is present at the source. If the DC OK LED is not on, this suggests that the PEMFs might not be switched on or might be faulty. –Verify that the AC-input power shelf FAULT LEDs are off. If a power module FAULT LED comes on, the power shelf has detected an internal fault; the power module is defective. You need to replace the power module. •Is at least one POWER LED on for the PEMFs on the rear of the server? –If yes, the power source is good and the PEMF is functional. Verify that the second POWER LED is on for power redundancy. –If not, verify that the power cable is connected at both ends and check that you have wired the DC-input connections correctly. If the MISWIRE LED is off, the DC-input connection is wired correctly. If the MISWIRE LED is on, the two DC conductors entering the PEMF terminal block are reversed. Power off the power at your power source and reverse the connections. –If neither the POWER nor the MISWIRE LED is on for a given PEMF, check the voltage at the input terminal block. If the voltage reading is not between -40 VDC and -60 VDC, replace the PEMF. •Is the cooling module POWER LED on? –If yes, the cooling module is receiving power. –If not, reseat the connection between the cooling module and the PEMFs: pull the cooling module partway out of the server and then reinsert it in the server. •Is the RSC POWER LED on? –If yes, the RSC is receiving power. –If not, try reseating the RSC in its backplane connection, or try using an RSC card known to be good in the same slot. Also try reseating the PEMFs in their connections to the backplane. If the RSC POWER LED does not come on, the backplane may be faulty. Replace the backplane. •Do the other server card power LEDs come on? –If yes, the cards are receiving power. –If not, the backplane may be faulty. Replace the backplane. Troubleshooting the Cooling Subsystems The Cisco AS5850 is designed to minimize problems in the cooling subsystem. The Cisco AS5850 can operate in temperatures of up to 120°F (50°C) for a maximum of 72 hours. The universal gateway also contains redundant fans in the cooling module, which allow the system to continue operating despite a single fan failure. The cooling module can be removed and replaced while the system is operating, provided that the procedure does not exceed 1 minute. Check the following to help isolate a problem with the cooling system: •Do all card slots either contain cards or card blanks? To properly cool the universal gateway, cool air needs to enter through the intake vent, flow up and past the cards, and get pushed out of the server exhaust by the fans in the cooling module (see Figure 5-2). If a card cage slot is left open, air can enter into the chassis through the card cage rather than the intake vent, upsetting the intended air flow. This prevents cards in the card cage from being cooled properly. Figure 5-2 Airflow •Do the cooling module fans operate? To determine whether the fans are operating, listen for them. In noisy environments, place your hand under the exhaust vents on the back of the cooling module to feel for air being forced out the vents. If no air is coming out, there is a problem with the fans or there is a problem with the power to the cooling module. If you determine that the power supply is functioning normally but a fan is faulty, you can replace the cooling module without powering off the universal gateway. Refer to the cooling module removal instructions in "Preparing for Installation," and the reinsertion instructions in "Installing the Cisco AS5850." For problems with the system power, refer to the section "Troubleshooting the Power Subsystem" in this chapter. •Is the green power LED on the cooling module front panel on? If no, verify that the cooling module is fully installed in the server, the connector is firmly connected to the PEMF, and the captive screws are tightened adequately. •Is a yellow fault LED on the cooling module front panel on? There are three fault LEDs, one for each bank of fans in the cooling module. If one of these LEDs is on, the newly installed cooling module might be faulty or the Mbus and power connector might be damaged. Shut off system power, remove the cooling module, and check the connectors. If the connectors are in good condition, reinstall the cooling module in the chassis and power ON the system. If the fault LED is still on, assume that the cooling module is faulty. Install another cooling module and return the faulty cooling module to the factory. •The following error message, if displayed on the console, indicates that the system has detected an overtemperature condition or out-of-tolerance power somewhere in the system. Queued messages: %ENVM-1-SHUTDOWN: Environmental Monitor initiated shutdown If an environmental shutdown results from an out-of-tolerance power condition, the POWER LED remains off and the system shuts down. (Refer to the section "Troubleshooting the Power Subsystems" in this chapter.) Although an overtemperature condition is unlikely at initial startup, ensure that heated exhaust air from other equipment is not entering the server's inlet vent and that there is sufficient clearance around the sides of the chassis to allow cooling air to flow. Refer to the "Preventive Site Configuration: Maintaining Normal Operation" section for preventive site configurations. The previous error message could also indicate a faulty component or temperature sensor. Before the system shuts down, find out exactly which component is experiencing temperature or voltage problems. Use the show environment table command to display the internal power and temperature thresholds, and compare the thresholds with current conditions listed in the output from the show environment command. Troubleshooting the Processor Subsystems The processor subsystem consists of the route switch controller card, port cards, and trunk cards in the Cisco AS5850. The following sections contain specific troubleshooting information for each of these components. The RSC is a required system component. The system cannot operate unless at least one RSC is installed properly; however, the system can operate without any feature cards installed, as long as none are in partial contact with the backplane pins. A server card that is partially connected to the backplane may cause the universal gateway to crash or to hang. Therefore, first ensure that the RSC is installed properly and that the system software has initialized successfully. Then, if necessary, you can troubleshoot individual feature cards. Troubleshooting the RSC The following sections describe troubleshooting procedures for the RSC. These procedures assume that the RSC is in the original factory configuration and that you have not made changes to your configuration file. If the RSC LEDs do not come on as expected (refer to the section "Identifying Startup Problems" in this chapter), check the following items to help isolate the problem: •Is the power LED on? –If yes, the RSC has booted successfully. –If this LED remains off at system startup, either there is a problem with the PEMF (it is damaged or not connected to the backplane), the backplane, or possibly the LED. •Do all RSC LEDs remain off when the system powers on? –If the LEDs remain off, first refer to the sections "Troubleshooting the Power Subsystems" and "Troubleshooting the Cooling Subsystems" in this chapter to ensure that both the cooling module and the DC PEMFs are functioning properly. –If the power and cooling systems appear operational but none of the RSC LEDs are on, ensure that the RSC is properly connected to the backplane. Power off the system. Remove the RSC, reinsert it, and tighten all captive installation screws, and then restart the system. You might also try switching the slot the RSC is in (from 6 to 7, or 7 to 6). If the problem persists, examining the backplane for bent connector pins. If none are found, contact your service representative (see the "Obtaining Technical Assistance" section on page xiv). You might need to replace the RSC card, or possibly the backplane. To inspect the backplane pins, first power off the system to avoid hazards caused by high voltages present on the backplane connectors. Next, remove cards in neighboring slots to allow an unimpeded view of the backplane connectors. Then, using a flashlight, verify that the backplane connectors are in good condition. If you discover bent pins, you need a new backplane. Contact your service representative to order a new backplane. •You can also use the show command to diagnose a problem with the RSC card. Enter the following command: Router> enable enter password password Router# show diag type {shelf \| slot} Ctrl-Z Troubleshooting the Feature Cards Troubleshooting information for T1, E1, CT3, or STM1 trunk cards or port cards is available in the Cisco AS5850 Universal Gateway Card Guide that shipped with your system. Troubleshooting Network Interfaces For information about isolating problems with the network connections to your universal gateway, refer to the publication Internetwork Troubleshooting Guide, which is available on the Cisco Documentation CD-ROM that shipped with your Cisco AS5850. For more information, see the "Related Documentation" section on page xii.
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