Methods and systems of a disaggregated optical transport network (OTN) switching system that include using plug-in universal (PIU) modules each having multiple ports for OTN to Ethernet transceiving and an Ethernet fabric as a switching core are disclosed. An OTN over Ethernet module in each of the PIU modules may enable various OTN functionality to be realized using the Ethernet fabric which may include multiple Ethernet switches. An ith port of the multiple ports of each PIU module may be connected to the ith Ethernet switch of each of the Ethernet switches. A PIU module may be associated with a respective sequential order of the Ethernet switches. The PIU module may transmit an Ethernet packet from an ith port of the PIU module corresponding to the ith Ethernet switch, where the ith port is selected based on the respective sequential order of the Ethernet switches.

Embodiments relate to optical transport technologies, and more specifically, to a clock transmission method. Under this method, a first optical data unit (ODU) container can be obtained. Phase discrimination can be performed on an obtained first clock and a first ODU clock of a transmit end, to generate a first PD value. The first PD value can then be inserted into an overhead of the first ODU container. The first ODU container can be encapsulated into a second ODU container, and the second ODU container can be sent. A rate of the second ODU container is higher than a rate of the first ODU container. The first PD value is transmitted in the first ODU container which is not decapsulated in a subsequent transmission process. Therefore, final recovery of the first clock is not affected, so that a deviation between a finally recovered clock and the first clock is greatly reduced.

Embodiments providing improved systems and methods deploying, monitoring, and troubleshooting optical physical layer networks are needed. In one embodiment, networks are first constructed in a specialized network factory, where they are racked, provisioned, audited, and tested by relevant experts in each technology. Then the equipment is custom-cratedwith all cards, patch cords, labels, and provisioning in placebefore being shipped to field locations. A production network health baseline is captured that creates a set of norms that later performance data can be compared against. Once the network is operational, the network health is monitored and compared against the baseline. If there's a deviation sufficient to satisfy a user-defined rule, a remedial action can be triggered. In another embodiment, a method isolates a problem in an optical transport network.

Methods and systems for optical data unit (ODU) path protection in a disaggregated optical transport network (OTN) switching system that include using plug-in universal (PIU) modules each having multiple ports for OTN to Ethernet transceiving and an Ethernet fabric as a switching core are disclosed. An OTN over Ethernet module in each of the PIU modules may enable various OTN functionality to be realized using the Ethernet fabric which may include multiple Ethernet switches. An egress PIU module may receive Ethernet packets via the Ethernet fabric from a working ODU path. In response to determining that a protection switch using a protection ODU path may be performed on the working ODU path, the egress PIU module may receive the Ethernet packets via the Ethernet fabric from the protection ODU path.

Embodiments relate to optical transport technologies, and more specifically, to a clock transmission method. Under this method, a first optical data unit (ODU) container can be obtained. Phase discrimination can be performed on an obtained first clock and a first ODU clock of a transmit end, to generate a first PD value. The first

PD value can then be inserted into an overhead of the first ODU container. The first ODU container can be encapsulated into a second ODU container, and the second ODU container can be sent. A rate of the second ODU container is higher than a rate of the first ODU container. The first PD value is transmitted in the first ODU container which is not decapsulated in a subsequent transmission process. Therefore, final recovery of the first clock is not affected, so that a deviation between a finally recovered clock and the first clock is greatly reduced.

Methods and systems of a disaggregated optical transport network (OTN) switching system that include using plug-in universal (PIU) modules for OTN to Ethernet transceiving and an Ethernet fabric as a switching core are disclosed. An OTN over Ethernet module in each of the PIU modules may enable various OTN functionality to be realized using the Ethernet fabric which may include multiple Ethernet switches. A virtual line card may include a logical aggregation of a kth Ethernet switch sub-port of each of the corresponding Ethernet switch ports of each of the Ethernet switches. A virtual switch fabric may include multiple virtual line cards for the OTN switching system. Each of the virtual line cards may be associated with a virtual address that may correspond to a respective PIU module. The virtual address may include a media access control address associated with the respective PIU module.

Methods and systems for Ethernet fabric protection in a disaggregated OTN switching system that include PIU modules each having multiple ports for OTN to Ethernet transceiving and an Ethernet fabric as a switching core are disclosed. An OTN over Ethernet module in each of the PIU modules may enable various OTN functionality to be realized using the Ethernet fabric which may include multiple Ethernet switches. A first PIU module may detect a fault condition on an Ethernet fabric plane of the Ethernet fabric. In response to the detection, the OTN switching system may transmit the fault condition to other PIU modules to redirect optical data unit traffic away from the fault on the Ethernet fabric plane.

Methods and systems of a disaggregated optical transport network (OTN) switching system that include using plug-in universal (PIU) modules each having multiple ports for OTN to Ethernet transceiving and an Ethernet fabric as a switching core are disclosed. An OTN over Ethernet module in each of the PIU modules may enable various OTN functionality to be realized using the Ethernet fabric which may include multiple Ethernet switches. An ith port of the multiple ports of each PIU module may be connected to the ith Ethernet switch of each of the Ethernet switches. A PIU module may be associated with a respective sequential order of the Ethernet switches. The PIU module may transmit an Ethernet packet from an ith port of the PIU module corresponding to the ith Ethernet switch, where the ith port is selected based on the respective sequential order of the Ethernet switches.

Methods and systems for optical data unit (ODU) path protection in a disaggregated optical transport network (OTN) switching system that include using plug-in universal (PIU) modules each having multiple ports for OTN to Ethernet transceiving and an Ethernet fabric as a switching core are disclosed. An OTN over Ethernet module in each of the PIU modules may enable various OTN functionality to be realized using the Ethernet fabric which may include multiple Ethernet switches. An egress PIU module may receive Ethernet packets via the Ethernet fabric from a working ODU path. In response to determining that a protection switch using a protection ODU path may be performed on the working ODU path, the egress PIU module may receive the Ethernet packets via the Ethernet fabric from the protection ODU path.

Methods and systems of a disaggregated optical transport network (OTN) switching system that include using plug-in universal (PIU) modules for OTN to Ethernet transceiving and an Ethernet fabric as a switching core are disclosed. An OTN over Ethernet module in each of the PIU modules may enable various OTN functionality to be realized using the Ethernet fabric which may include multiple Ethernet switches. A virtual line card may include a logical aggregation of a kth Ethernet switch sub-port of each of the corresponding Ethernet switch ports of each of the Ethernet switches. A virtual switch fabric may include multiple virtual line cards for the OTN switching system. Each of the virtual line cards may be associated with a virtual address that may correspond to a respective PIU module. The virtual address may include a media access control address associated with the respective PIU module.