frames with a bitrate of (approximately) 150 Mbit/s (STM-1/OC-3), 622 Mbit/s (STM-4/OC-12), 2.5 Gbit/s (STM-16/OC-48) or 10Gbit/s (STM-64/OC-192). The frames are divided into 32 kb payload cells that carry the service data from source to destination. Via the OTN management system (OMS), as many cells as required by the service are allocated to connections. This bandwidth allocation is transferred to the non-volatile memory of the control boards of the nodes. As a result, the network is able to start up and work without the OMS connected or on line. External links OTN Product information on company website Wide area networks Metropolitan area networks Network architecture Networking hardware Telecommunications infrastructure