1GbE-4H Hitless Line Module for Data

As a line card in a MD8000 chassis, the 1GbE-4H Hitless data module offers four 1Gbps Ethernet ports for hitless service. The card provides hitless switching for bi-directional customer data traffic between endpoints while providing path diversity between those same endpoints.

Each source 1GbE Hitless line port encapsulates customer data into a single RTP stream at the transmitter side. The receiving 1GbE line card then checks and lines up sequence numbers and timestamps in the RTP header and passes the best packet to the egress interface.  This allows the network to handle routine errors that may occur such as out-of-order packets, duplicate packets, and lost packets. When erred packets are detected in any one transmission path, packets from the other transmission path will be used automatically with zero second switchover. Error checking and hitless switchover is handled transparently by the card’s internal logic.