ATM Quality of Service Review

A basic performance measure for any digital data communication system is bit error rate (BER). Well-designed fiber-optic links will predominate now and into the foreseeable future. We may expect BERs from such links on the order of 1 x 10-12 and with end-to-end performance better than 5 x 10-10 (Ref. 14). Thus other performance issues may dominate the scene. These may be called ATM unique QoS items, namely:

• Cell transfer delay

• Cell delay variation

• Mean cell transfer delay

• Cell error ratio

• Severely errored cell block ratio

• Cell misinsertion rate

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