Passive Optical Networks - Transport concepts - download pdf or read online

By Sami Lallukka & Pertti Raatikainen

ISBN-10: 9513867064

ISBN-13: 9789513867065

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If the upper threshold of idle frames is reached, the OLT allocates less bandwidth to the ONU and if the lower threshold is reached, the OLT allocates more bandwidth to the ONU. The downstream payloads are churned by 14-bit codes in the OLT and the ATM headers are transported non-churned. The churning key is provided by the ONU 29 on request from the OLT. The churning for ranged or non-ranged ONUs starts immediately after the first churning key is received. However, churned virtual paths of previously active ONUs should be restored when an ONU is reactivated.

It has a separated 12-bit field for the length of the bandwidth map (BWmap) and for the ATM section. The actual BWmap length is 8 times the provided value and the length of the ATM map is 53 times the provided value. The last 8 bits are for the Cyclic Redundancy Check (CRC). • BWmap field is a scalar, which specifies when an ONU can start to transmit, which type of traffic (T-CONT type) it can transmit and when to stop transmission. • AllocID is an allocation identifier of a T-CONT. 37 • Flags field defines the required control messages to be sent during the allocated timeslot.

The MAC concept is illustrated in Figure 12. The OLT sends pointers in PCBds, and these pointers 39 indicate the time at which each ONU may start and stop its upstream transmission. In this way, only one ONU can access the medium at a time, and there is no overlapping in normal operation. The pointer values are given in the number of bytes, allowing the OLT to control the medium at the bandwidth granularity of 64 kbit/s. However, it is possible to set the pointer values to a larger granularity and achieve fine-grained bandwidth control via dynamic scheduling.

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Passive Optical Networks - Transport concepts by Sami Lallukka & Pertti Raatikainen

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