Meanings and methods of different loopbacks on an MSTP device

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Meanings and methods of different loopbacks on an MSTP device:
1. Software loopback: indicates loopbacks (except physical loopbacks) that can be set on the NMS. For a line optical board, you can open the channel diagram and set loopbacks for optical interfaces and VC-4 channels. Pay attention to the monitoring channels. Otherwise, the MSTP device may be unreachable to the NMS. Software loopbacks cannot be set for VC-12 channels. For a 2M tributary board, the software loopback can be set for each 2M interface.
2. Inloop and outloop: These two types of loops are different in the direction. An inloop indicates a loop from an interface to the inside of a device. An outloop indicates a loop from an interface to the outside of a device.

Other related questions:
How is power outage loopback on VGA ports implemented for TE series endpoints?
Power outage loopback on VGA ports is implemented for TE series endpoints as follows: Power outage loopback on an output port refers to the following scenario: Upon power outage, an endpoint functions as a cable adapter and automatically transmits input VGA signals to the output port. One cable and one installation mode apply to multiple scenarios.

Difference between logical fibers on a WDM/OTN device and those on an MSTP/SDH device
Each logical fiber on an SDH device represents a pair of physical fibers and each logical fiber on a WDM device represents one physical fiber.

Does the U1900 series unified gateway support loopback test
Method of performing the loopback test for the E1 line on the U1900: - Physically connect a pair of tx and rx ports of the E1 line, and obseve the RFA indicator and LOS indicator on the U1900. If they are both off, the local loopback test is successfully.

How do TE endpoints implement power outage loopback on VGA ports?
To implement power outage loopback on VGA ports for TE endpoints: The power outage loopback function on output ports is to automatically transmit input VGA signals to the output port to directly send out signals when an endpoint is powered off. Here, the endpoint functions as the cable converter. The function only uses one cable and one installation method but can apply to multiple scenarios.

Different between D12B and D75S of MSTP
D75S: 32*E1 (75Ω) eletrical signal ,DS12S : 32*E1 (120Ω) eletrical signal

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