Constant bit rate has the best QoS, with
Constant bit rate has the best QoS, with low cell jitter. It can be used for broadcast video contribution circuits, possibly a 34 Mbit/s data stream. The variable bit rate real-time can be used for standard voice circuits. IP traffic usually is allocated the unspecified bandwidth. Some characteristics that make ATM particularly attractive for television distribution are the choice of uni- or bidirectional links; the two-way links can be asymmetric. As network traffic increases, the bandwidths grow to the point where optical switching becomes the only cost-effective way to handle the very high data rates of the network backbones. So the electronic processing of SONET and SDH will fall by the wayside. The move now is to an all-optical infrastructure called photonic networking. Photonic networking As IP becomes the standard for data exchange, and voice-over IP becomes more used, the overhead of the ATM traffic engineering becomes more of a hindrance. Proposals to run IP directly over the Dense-Wave Division Multiplexed (DWDM) photonic network would greatly simplify the routing of traffic by stripping out two layers, ATM and SONET. To introduce this new concept, the capability of IP routing would have to be extended. IP networks and telecommunications 29 real time variable bit rate available bit rate time bandwidth best effort constant bit rate non real time VBR link bandwidth Figure 2.6 ATM traffic classes.
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