Table Of Contents

Troubleshooting

Troubleshooting the Installation and Setup

Troubleshooting the Power Subsystem

Troubleshooting the Ethernet Controller

RFswitch App

Ethernet Controller LEDs

Ethernet Controller Switch Settings

Troubleshooting Upstream and Downstream Switch Modules

Status LEDs

Cisco uBR 3x10 RF Switch Slot Information

Troubleshooting

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This chapter contains troubleshooting information for the Cisco uBR 3x10 RF Switch.

Troubleshooting the Installation and Setup

Figure 6-1 shows the general troubleshooting strategy described in this chapter to troubleshoot possible scenarios under which the system may not perform because of the Cisco uBR 3x10 RF Switch hardware being inappropriately installed or set up. Refer to this chart, as necessary, to follow the steps to isolate hardware problems to a specific module; then resolve the problem, if possible.

If you are unable to easily solve the problem, see the "Obtaining Technical Assistance" section on page xviii for information on contacting Cisco technical assistance.

To efficiently address your specific situation, use the checklist (Table 6-1) to log information that you will need to provide to the Cisco technical assistance representative.

Table 6-1 Information Checklist

Description	Information
Date you received your Cisco uBR 3x10 RF Switch
Chassis serial number
Type of software and release number
Maintenance agreement or warranty information
Brief description of the problem you are having
Brief explanation of the steps you have taken to isolate and resolve the problem

Figure 6-1 Troubleshooting Flowchart

Troubleshooting the Power Subsystem

Check the following to help isolate a problem with the power system.

•Does the POWER LED come on when system power is turned on? If not:

–AC—check to ensure that the AC power cord is plugged in to the power supply and the power source (wall or power strip).

–DC—verify that the -48 and +48-V leads are correctly attached to the power supply.

–Verify that the system is properly grounded.

–Ensure that the voltage selection switch is in the appropriate AC or DC position.

•If you are unable to resolve the problem, see the "Obtaining Technical Assistance" section on page xviii for information on contacting Cisco technical assistance.

Troubleshooting the Ethernet Controller

RFswitch App

The RfswitchApp (residing in flash memory) is the main system firmware component. It provides full network functionality (Telnet, TFTP, SNMP Agent) and line card control. The SysLoader (residing in boot flash memory) is a special build of the RfswitchApp firmware without SNMP agent support or line card control functionality to help increase reliability, because it is normally invoked as a result of a system crash. The SysLoader is capable of sending SNMPv1 traps as simple UDP packets, and fully supports Telnet and TFTP operations.

The Ethernet controller firmware is structured into three parts, the ROMMON, the SysLoader, and the main RfswitchApp. The SysLoader component is stored in onboard flash memory designated as the bootflash memory. The RfswitchApp resides in a separate area designated as flash memory.

The ROMMON is the first component to run. It is invoked whenever a reset event occurs, either by bootup, system crash, or software reload. The ROMMON is responsible for determining the cause of the reset event and controls the next phase of system bootup.

If the reset event is because of a system crash, the ROMMON attempts to load the SysLoader from bootflash memory into RAM and run it. If the bootflash memory is invalid, the ROMMON will then attempt to load the RfswitchApp from flash as a last resort. If the cause of the reset event was a normal bootup or reload, then an attempt is made to load and run the RfswitchApp. If this fails, then an attempt is made to load and run the SysLoader.

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Note The system prompt changes from rfswitch> to Sys> if the SysLoader is running. If the ROMMON is unable to load either the SysLoader or RfswitchApp, then it remains in control, and the controller's SYS LED is off and the ERR LED flashes.

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Ethernet Controller LEDs

If the Ethernet controller LEDs do not come on as expected, check the following items:

•SYS LED is on, ERR LED is off

–System has successfully booted

•All LEDs remain off

–Troubleshoot the power subsystem

•SYS LED is off, ERR LED is on

–The system has detected a bootup error or system crash event. Use the show log command to view the system event log to determine the cause of the problem.

•SYS LED is on, ERR LED is on

–A problem has been detected configuring or controlling the switch modules. One or more of the switch modules ERROR LEDs is on. If so, refer to the "Troubleshooting Upstream and Downstream Switch Modules" section.

Ethernet Controller Switch Settings

These switches are found on the Ethernet controller module PC board.

Figure 6-2 Ethernet Controller Faceplate and PC Board

Table 6-2, Table 6-3, and Table 6-4 show hardware configuration switch settings for the Ethernet controller. These are set at the factory and should not be changed.

Table 6-2 SW4—Option Select 

Switch	Name	Description	Default	Baud Rate Select
				BR1	BR0	Rate
1	--	Not used	OFF	0	0	9600
2	--	Not used	OFF	1	0	19200
3	BR1	Baud rate select	OFF	0	1	38400
4	BR0	Baud rate select	OFF	1	1	57600

Table 6-3 SW3— System Configuration 

Switch	Name	Description	Default	Memory Select			Load Sequence Override
				MR1	MR2	Description	LS1	LS2	Description
1	MS1	Memory select	OFF	0	0	Normal	0	0	Normal sequence
2	MS2	Memory select	OFF	1	0	External ROM card	1	0	Run ROMMON with WDOG disabled
3	LS2	Load sequence override	OFF	0	1	Emulation mode (reserved)	0	1	Run SysLoader
4	LS1	Load sequence override	OFF	1	1	Emulation mode (reserved)	1	1	Normal sequence with WDOG disabled

Table 6-4 SW2—Serial Port Hardware Control

Switch	Name	Description	Default
1	CTST	EIA/TIA-422 Mode CTS Termination OFF—No termination ON—120-ohm termination	OFF
2	RXDT	EIA/TIA-422 Mode RXD Termination OFF—No termination ON—12-ohm termination	OFF
3	RTSS	EIA/TIA-422 Mode RTS line OFF—RTS+ not connected ON—RTS+ connected	OFF
4	MODE	Serial Port Mode OFF—EIA/TIA-232 ON—EIA/TIA-422	OFF

Troubleshooting Upstream and Downstream Switch Modules

Each upstream and downstream switch module has four LEDs that indicate the working status of the port. The upstream switch module operates over the frequency range of 5 to 70 MHz. The downstream (high-frequency) switch module operates over the frequency range of 54 to 860 MHz. During normal system operation, upstream switches all direct traffic to their respective default termination interfaces.

Each switch module takes on eight signal inputs from the power splitter and routes the signal to a protect output, or splits the inputs into two groups of four inputs and sets up the switch to select one of four inputs as a protect output. The relays are electromechanical and controlled through the power interface connector.

The switch card should provide a minimum of 60 dB of isolation from connector port to connector port during normal operation and more than 20 dB when operating in protect mode.

Status LEDs

Each upstream and downstream switch module has four LEDs on the faceplate that indicate the working status of the port as described in Table 6-5.

Table 6-5 Switch Board LED Descriptions

LED Name	Color	Description
Protect 1	Green/Yellow	Indicates CMTS/PROTECT 1
Protect 2	Green/ Yellow	Indicates CABLE PLANT/PROTECT 2
Error 1	Off/Yellow	Indicates a channel problem in 1
Error 2	Off/Yellow	Indicates a channel problem in 2

When an upstream or downstream switch module initially boots, the LEDs briefly cycle on in sequence. After the bootup,

•The PROTECT1/PROTECT2 LEDs are on/off for single protect mode, or on/on for dual protect mode. The LED color reflects the current setting of the module protect mode switch—green for idle or yellow for any protect position.

•The ERROR1/ERROR2 LEDs stay on until the Ethernet controller detects and enumerates the switch module.

•If either of these LEDs remain on (yellow) after the system boot sequence, there is either a communications failure or a switch position failure. Use the test module command to diagnose failure.

If you are unable to resolve the problem, refer to the "Obtaining Technical Assistance" section on page xviii for information on contacting Cisco technical assistance.

Cisco uBR 3x10 RF Switch Slot Information

Table 6-6 lists the RF modules and the ports assigned to each module.

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Tip The modules are listed as seen from the front of the RF switch.

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Table 6-6 Switching Matrix for the Cisco uBR 3x10 RF Switch (Upstream and Downstream Modules)

RFS Module	Working Ports	PROTECT Ports	Type	RFS Module	Working Ports	PROTECT Ports	Type
2	1H—8H	P1H, P2H1	upstream	1	1A—8A	P1A, P2A	upstream
4	1I—8I	P1I, P2I	upstream	3	1B—8B	P1B, P2B	upstream
6	1J—8J	P1J, P2J	upstream	5	1C—8C	P1C, P2C	upstream
8	1K—8K	P1K, P2K	upstream	7	1D—8D	P1D, P2D	upstream
10	1L—8L	P1L, P2L	upstream	9	1E—8E	P1E, P2E	upstream
12	1M—8M	P1M, P2M	downstream	11	1F—8F	P1F, P2F	downstream
14	not used	—	—	13	1G—8G	P1G, P2G	downstream

1 P2 is used only when the switch is in 4 + 1 mode.

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Figure 6-3 RF Switch from Front