Cisco WT2700 Wireless Suite

Document ID: 14242

Possible Problems

Checks & Observations

Solutions

Comments

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This is the proper status line condition. No action is required.

Possible Problems

Checks & Observations

Solutions

Comments

Interference

Run histograms and/or snapshots; measure SNR and Rx signal level at both ends of the link

Try to locate source of interference (for example, nearby antennas)

Change polarization of antennas or frequency channel (UNII only)

If interference is the source of trouble, the SNR readings must show a degradation that correlates in time with the noted periods of poor link performance or outages

Poor (weak) receive signal level

Check antenna alignment

Check cable/connector integrity (possible moisture in cables)

Check transmit power level for the link

Check for path blockage of link (for example, trees, buildings, etc.)

Change bandwidth and throughput setting

Replace faulty cables if necessary

Reconfigure Tx power setting if necessary Realign antennas

Change the throughput setting as a work-around. Only change throughput settings after you try the other solutions given.

Loopback enabled

Check the configuration and issue the show run and show interface radio slot/port commands

Disable loopback command

Incorrect throughput setting

Check the configuration, and issue the show run command

Run a histogram to check the SNR

-Adjustthroughput setting accordingly

This parameter must be set the same at both ends of the link

Faulty control cable connection;

Check all control cable connections; wiggle suspected control cable while you monitor link status to verify faulty connection

Replace cable or connections if necessary

Possible Problems

Checks & Observations

Solutions

Comments

Radio interface shutdown

Check the configuration and issue the show interface radio slot/port command

No shut the radio interface

Note that if this is the problem, the output of show interface will display "Radio x is administratively down"

Interference

Run histograms and/or snapshots; measure SNR and Rx signal level at both ends of the link

Try to locate source of interference (for example, nearby antennas)

Change polarization of antennas or frequency channel (UNII only)

If interference is the source of trouble, the SNR readings must show a degradation that correlates in time with the noted periods of poor link performance or outages

Wireless line card faulty

Run IF and RF loopback tests and ping the radio interface to verify

Replace line card

Frequencies configured incorrectly

Check configuration, and issue the show run command

Fix the configuration; Tx at one end of the link matches to the Rx of the other end

Radio ARQ configured incorrectly

Check the configuration, and issue the show interface radio arq command

Fix the configuration

This parameter must be set the same at both ends of the link

Number of antennas set correctly

Check the configuration and issue the show run command

Fix the configuration

Incorrect throughput setting

Check the configuration; measure the SNR

-Adjust the throughput setting accordingly

This parameter must be set the same at both ends of the link

Radio privacy set the same on both sides

Check the configuration, and issue the show run command

Fix the configuration

This parameter must be set the same at both ends of the link

Transmit power configured incorrectly

Check the configuration, and issue the show run command

Fix the configuration, and set radio transmit power to a valid value for the link

No power to one or both transverters (ODUs)

Use a voltmeter to check DC voltage at input to PFPs

Check that DC breaker switches on PFPs are turned on

Repair/replace DC power supplies

Turn on breaker switches on PFPs

Check cable integrity and connections

Ensure that cable is 50 ohm type

Run debug radio log verbose

Replace the cable if necessary

Be sure all outdoor connections are properly sealed, only use Coax-Seal or an equivalent

Control cable between PFP and transverter bad or disconnected

Check cable integrity, especially cable-to-LEMO connector junction

Run debug radio log verbose

Replace the cable if necessary

Weather proofing not required for LEMO connector

Poor or no receive signal level

Verify by measuring SNR from histograms

Be sure antennas are set for the same polarization

Be sure the antennas are aligned properly

Check all cabling, IF and RF

Have both sides of the link with the same polarization (horizontal or vertical)

Align the antennas

Replace the cables if necessary

Incorrect duplexer installed

Check the sticker on duplexer at each end of the link to ensure both ends are for the same band plan

Duplexers cannot be re-tuned, they must be replaced

Incorrect duplexer set-up

Duplexer at one end must be installed for tx high and the other side for tx low

Remove, reverse, and reinstall ONE of the duplexers

ODU not detected

Run IF loopback test, ping radio interface to verify whether the line card is good

Run debug radio log verbose to verify the problem

Replace ODU