Black Box MT1000A-13-R3, Quick Start Manual

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Chapter 5 Testing and Diagnostics MT1000A Installation and Operation Manual
5-6 Diagnostic Tests
Fiber Optic Link Local Loopback in the MT1000A
The fiber optic local loopback returns the transmit signal of the active fiber optic
link interface to the input of the receive path. Simultaneously, the local
MT1000A sends an unframed all-ones signal to the fiber optic link.
Figure 5-2
shows the fiber optic link local loopback connection.
When this loopback is activated, the equipment connected to the local
MT1000A tributary must receive its own transmission.
This test checks the operation of the local MT1000A, and the connections to the
equipment attached to the tributary interfaces.
Figure 5-2 Fiber optic Link Local Loopback in the MT1000A