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Network World Fusion

Dynamic synchronous transfer mode (DTM) is a new broadband network technology that helps enterprise networks efficiently carry voice, data and streaming video on a single, integrated network.

Developed by the Swedish Royal Institute of Technology, Ericsson and other companies, DTM can automatically set up connections and assign a certain number of channels or bandwidth to each connection, depending on traffic type and bandwidth requirements - all with little or no delay.

Specifically, DTM divides fiber pipe capacity into frames of 125 microseconds, which are further divided into 64-bit slots. The number of slots per frame depends on the bit rate. For example, with a bit rate of 2.5G bit/sec, the number of slots is around 4,800. DTM uses a distributed algorithm for slot reallocation - the pool of capacity, or free slots, that is distributed among DTM nodes.

To learn more about DTM, please visit Network World Fusion.

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ETSI

DTM, short for Dynamic synchronous Transfer Mode, is a new transport network technology specifically designed for the foreseen explosion of real time media content within the Next Generation Networks (NGN).

DTM is designed to fully utilize the almost unlimited capacity of optical fiber by emphasising simplicity and avoiding computation-intensive policing, queuing, buffering and control mechanisms. This is achieved through the technologyýs inherent characteristics, including low propagation delay, almost zero delay variation, dynamic allocation of bandwidth, full traffic isolation between channels and scalable, high-speed transmission.

DTM guarantees high transport quality even over large-scale networks and it works very well over a dense wavelength division multiplexing (DWDM) infrastructure. DTM simultaneously meets the transport demands of different traffic types such as Video, IP and PDH over a single, integrated network. To optimise the use of bandwidth, transparent channels can be set up on demand in steps of 512 Kbps up to the full fibre capacity. Due to the inherent guaranteed capability to provide real-time video transmission at full broadcast and studio quality, DTM equipment has been chosen by existing commercial networks.

To learn more about DTM, please visit ETSI.