Relationship between OTS, OMS, and OCh layers of WDM devices

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OTS is located between the FIU or OA boards of two sites. OMS is located between the MUX and DEMUX boards of two sites. OCh is a span on a single wavelength.

Other related questions:
Relationship between the OTS, OMS, and OCh layers
An OTS trail is a trail between FIU boards or between OA boards at two sites. An OMS trail is a trail between MUX, DEMUX, or OADM boards at two sites. An OCh trail is a span between line boards.

Relationship between the power consumption and heat consumption of devices
For transport devices, the heat consumption and power consumption are similar and can be considered the same. Heat consumption is expressed in BTU/h, while power consumption is expressed in W. The conversion between the two units is as follows: 1 BTU/h = 0.2931 W.

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.

Hardware differences between LWC boards on LH WDM devices
Question: SSE1LWC and SSEM1LWC are present in technical documents. Do they have any differences? Answer: SSEM1LWC is a configuration board and SSE1LWC is a finished board. The two boards can be considered as the same board in most cases, and even SSEM1LWC is regarded as SSE1LWC in communication. However, you need to differentiate them in spare parts application and rectification, because you need to provide the BOM numbers of multiple configuration modules when applying for a configuration board, but you need to provide only one BOM number when applying for a finished board.

Interruption of the communication between WDM devices and the DCN network after the WDM devices are connected to the DCN network through hub
The main reasons for the interruption between WDM devices and the DCN network are as follows: 1. Switch issues in the DCN network 2. Network cable issues 3. IP address configuration issues 4. Hub issues

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