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DTM divides the total fibre capacity into frames of 125 microseconds, which are further divided, into 64-bit slots. The number of slots per frame is dependent on the bitrate. With the planned bitrate of 2.5 Gbps, the number of slots is around 4800. The choice of a frame time of 125 microseconds and 64 bits per slot will enable very simple adaptations to digital voice and ISDN.
The slots are separated into data and control slots. At any point in time (Figure 4), every slot is either a data slot or a control slot. Each node has access to at least one control slot, which is used for sending control information to the other nodes. Control messages can be sent upon request from a user, in response to...