Ciena

About: Ciena is a company organization based out in Hanover, Maryland, United States. It is known for research contribution in the topics: Signal & Node (networking). The organization has 1259 authors who have published 1557 publications receiving 25989 citations.

Systems and methods for collecting and analyzing data to determine link quality and stability in layer two networks

Abstract: A method and network element include receiving, at a receiver node, at least one of sender timestamps and sequence numbers in continuity check (CC) frames sent by a sender node; determining receiver timestamps at the receiver node; detecting instability based on one or more of the at least one of sender timestamps and sequence numbers and the receiver timestamps; and performing a remedial action based on the detecting instability. The CC frames can include Bidirectional Forwarding Detection (BFD) or Continuity Check Message (CCM) frames which are regularly transmitted in a session, but do not currently include timestamps or sequence numbers.

Port congestion resiliency in a multi-card and multi-switch link aggregation group

Abstract: Systems and methods for port congestion resiliency in a Link Aggregation Group (LAG) including a multi-card LAG and/or a multi-switch LAG. A method includes receiving a packet for egress over the LAG; responsive to determining no congestion over internal ports not part of the LAG, hashing with all member ports in the LAG in a distribution state; and, responsive to determining congestion over the internal ports, hashing with only member ports on a local card in which the packet was received, wherein the hashing determines which member port the packet egresses from in the LAG. The multi-card LAG includes multiple cards where packets ingress and egress from, and the cards communicate via a backplane port which is not part of the LAG. The multi-switch LAG includes multiple chassis where packets ingress and egress from, and the chassis communicate via an inter-switch connectivity port which is not part of the LAG.

Optical module heatsink lifter and method

Abstract: A module heatsink lifter for raising and lowering a heatsink enabling insertion and removal of a module includes a fixed base; a hinge connector of the fixed based coupled to the heatsink; and an actuator mechanism to raise and lower the heatsink through rotation about the hinge connector, wherein the actuator mechanism operates from a front faceplate based on push and pull movement to raise and lower the heatsink into a raised position and a lowered position. The heatsink includes a Thermal Interface Material (TIM) on a bottom portion which creates a thermal connection with the module when the heatsink is in the lowered position. The module can include a pluggable optical module.

Noise suppression and amplification systems and methods for colorless optical add/drop devices

Abstract: A method for noise suppression in a colorless optical add/drop system implemented prior to a colorless optical add/drop device includes, subsequent to receiving an optical signal from an optical modem, filtering the optical signal with a wavelength blocking filter to suppress out of band Amplified Stimulated Emission (ASE) in order to prevent noise funneling in the colorless optical add/drop device; and providing the filtered optical signal with the out of band ASE suppressed therein to a multiplexer port in the colorless optical add/drop device. The method can include, prior to the filtering, amplifying the optical signal with a single channel amplifier, wherein the single channel amplifier can include a pump laser shared with one or more additional single channel amplifiers.

Mesh restorable service systems and methods with preemptible established backup paths

Abstract: A method, implemented in a node in a network, for a preemptible established backup path for a mesh restorable service includes, responsive to a new service request for the mesh restorable service with the preemptible established backup path, establishing a primary path designated as a current path for the mesh restorable service at a designated priority; establishing a backup path for the mesh restorable service at a lower priority than the designated priority, subject to bandwidth availability in the network; and responsive to a fault affecting the primary path, switching to the backup path and raising a priority of the backup path to the designated priority.