Different between D12B and D75S of MSTP

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D75S: 32*E1 (75Ω) eletrical signal ,DS12S : 32*E1 (120Ω) eletrical signal

Other related questions:
What are the differences between STP, RSTP, and MSTP
The differences between Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), and Multiple Spanning Tree Protocol (MSTP) are as follows: -STP: only supports a single instance. -RSTP: supports fast convergence and a single instance. -MSTP: includes the advantages of RSTP, and supports multiple instances.

STP, RSTP, and MSTP differences for AR router
The differences between STP, RSTP, and MSTP are as follows: - STP: Indicates Spanning Tree Protocol and supports single instances only. - RSTP: Indicates Rapid Spanning Tree Protocol and supports fast convergence and single instances. - MSTP: Inherits the advantages of RSTP and supports multiple instances.

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.

Meanings and methods of different loopbacks on an MSTP device
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.

Relationship between MSTP device unreachability and service interruption
Relationship between MSTP device unreachability and service interruption: SDH service and monitoring channels are distributed in different positions of an STM-N frame. By default, the regenerator section overhead bytes D1–D3 are used as the monitoring channel, and the payload area of the STM-N frame is used as the SDH service channel. Modules on each board can independently process the bytes and payloads. In normal cases, services will not be interrupted due to device unreachability(a monitoring channel fault). Device unreachability indicates that the monitoring signals cannot be transmitted or received from the NMS to an NE. For example, DCC bytes fail to be transmitted or received. The possible cause is that the system control board may be faulty. A service interruption indicates that service signals are unreachable at the source and sink ends. If a device becomes unreachable and a service is interrupted, the following faults may occur: power outrage, board faults, or link faults. You can determine the possible cause based on alarms reported on upstream NEs.

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