Cisco 7246 Hardware Installation Guide - Page 167

Chapter 6 Troubleshooting Problem Solving with Subsystems Caution A port adapter or cable interface line card that is partially installed in the midplane can cause the system to hang and crash. • Cable headend subsystem-External to the Cisco uBR7200 series router, this subsystem can prevent operation of the universal broadband router if the headend is not properly set up for the introduction of digital data into the hybrid fiber-coaxial (HFC) network. The following section helps you isolate a problem to one of the subsystems and directs you to the appropriate troubleshooting section. Identifying Startup Problems When you start up the Cisco uBR7200 series router for the first time, observe the startup sequence described in the "Powering On the Cisco uBR7200 Series Router" section on page 3-25. This section contains a detailed description of the normal startup sequence. Although an overtemperature condition is unlikely at initial startup, the environmental monitoring functions are included in this chapter because they also monitor internal voltages. Startup problems are commonly caused by source power problems or a board (network processing engine, I/O controller, port adapter, or cable interface line card) that is not properly connected to the midplane. Always check that your boards are properly installed in the chassis. With the exception of the fan tray and network processing engine, LEDs indicate all system states in the startup sequence. By checking the state of the LEDs, you can determine when and where the system failed in the startup sequence. Note On rare occasions, an LED may be faulty. Use the following descriptions to isolate the problem to a subsystem, then proceed to the appropriate sections to try to resolve the problem. When you start up the system, by turning on the power supply switch, the following should occur: 1. You should immediately hear the fans operating. If not, proceed to the "Cooling Subsystem" section on page 6-5. If you determine that the power supply is functioning normally and that a fan is faulty, contact a customer service representative. If a fan does not function properly at initial startup, there are no installation adjustments that you should make. 2. The power supply's green power OK LED (at the rear of the chassis) should go on immediately when you place the power supply switch in the ON (|) position, and should remain on during normal system operation. If the green power OK LED does not go on, proceed to the "Power Subsystem" section on page 6-5. 3. The LEDs on the I/O controller should go on as follows: a. The I/O power OK LED comes on immediately and indicates that the I/O controller is receiving DC power from the Cisco uBR7200 series router midplane. This LED comes on during a successful boot and remains on during normal operation of the router. If this LED remains off when starting the router, either there is a problem with the power supply (it is damaged or not connected to the Cisco uBR7200 series router midplane), or the network processing engine (NPE) or the I/O controller is not connected to the midplane. Proceed to the "Troubleshooting the I/O Controller" section on page 6-6. OL-5421-03 Cisco uBR7200 Series Universal Broadband Router Hardware Installation Guide 6-3