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Hardware loopback and software loopback

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A hardware loopback is performed on a physical port (an optical port) using a fiber. It must be performed onsite, while a software loopback can be configured on the NMS.
A loopback will interrupt services, and therefore it is often used for deployment commissioning or service interruption diagnosis.

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Optical port loopback operations

Loopbacks are used to locate faults. An outloop can be used to test whether the fiber line and connector are normal. An inloop can be used to test whether signals are correctly processed inside a board. Both outloops and inloops are software loopback operations performed on the NMS.

Channel loopback

A channel loopback loops back a single ODUk signal rather than signals of an entire board. A channel loopback on one service does not affect other services on the same board. It is used to check whether an ODUk signal sent from a tributary board is normal and whether the line board can properly process this ODUk signal.

Constraints on loopbacks of the TN53ND2 board

A loopback on the TN53ND2 board can apply only to service granularities received from the backplane side. For example, ODU0 granularities received from the backplane side can be looped back, but ODU1 granularities multiplexed from ODU0 granularities cannot be looped back on the TN53ND2 board.

Constraints on loopbacks of the TN53NS2 board

A loopback on the TN53NS2 board can apply only to service granularities received from the backplane side. For example, ODU0 granularities received from the backplane side can be looped back, but ODU1 granularities multiplexed from ODU0 granularities cannot be looped back on the TN53NS2 board.

Do TE30 endpoints support VGA loopback

TE30 endpoints do not support VGA loopback.

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Hardware loopback and software loopback

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