Introduction to Data Communications
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If the Main Ring fails due to cable faults or MSAU problems, the Main Ring can be wrapped to the Backup Ring. Wrapping is a term that is used to indicate that the Backup Ring is being used in addition to the Main Ring.

The Backup Ring is connected to the Main Ring. The Main Ring or a portion of the Main Ring is still being used. Wrapping is only associated with the Ring In and Ring Out connectors on the MSAUs.

This can be done either of 3 ways:

• Passive Hermaphroditic Style MSAUs - remove the suspected RI or RO Hermaphroditic connector. The connector will automatically short and wrap the Main Ring to the Backup Ring
• Passive RJ11 & RJ45 Style MSAUs - Manually switch the suspected RI or RO connector with the available switches
• Active MSAUs - They will automatically wrap if there is a problem.

Introduction to Data Communications
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