Ericsson LBI-39224 Recovery From Improper Redundant Clock Enabling, If Audio Boards Are Not Mixed

LBI-39224

basis from the CEC/IMC Manager. The Local CEC/IMC ID is displayed at the top center of the dialog box. Unselect the check box to disable this feature.

Help

Choose the Help button to access the Help function. (Help is also available by pressing the F1 key.)

Save and Send

Choose the Save and Send button to save the new Redundant Clock configuration to the CEC/IMC Manger's hard disk drive and to send the new configuration to the CEC/IMC. Verification messages are displayed at the CEC/IMC Manager when the new configuration is saved to disk and when the CEC/IMC receives the Redundant Clock configuration.

Recovery From Improper Redundant Clock Enabling

If the CEC/IMC is equipped with the earlier Audio Boards (19D903302P1 Rev. J or before), the CEC/IMC may begin toggling between the two clock circuits if the Redundant Clock feature is enabled. Errors will be logged at the CEC/IMC Manager and audio problems will occur that may or may not be noticeable. The audio problems will be more noticeable in larger CEC/IMCs. If no backup clock is turned on during the clock toggles, distinct periods of good audio then no audio will occur as the CEC/IMC toggles between clock circuits. To restore correct operation if this feature is accidentally enabled with the earlier Audio Boards, perform one of the following procedures:

If Audio Boards Are Not Mixed:

(19D903302P1 up to Rev. J, no 19D903302P1 Rev. K or later, and no 19D903302P3 boards)

1.Turn all "B" clocks OFF at the Clock Boards. All clock- related LEDs on all Audio Boards (BCLK, SSYNC, FSYNC, 2175) should go out and stay out.

2.At the CEC/IMC Manager disable the redundant clock feature.

3.Turn one "B" clock ON. All clock LEDs on all Audio Boards should illuminate.

If Audio Boards Are Mixed:

1.At the CEC/IMC Manager disable the redundant clock feature.

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