元延（前12年——前9年）是西汉时期皇帝汉成帝刘骜的第六个年号，共计4年。
本方案不仅能够灵活动态地分配用户上行接入的带宽，还具有统一的业务流管理、高带宽利用率和低信元时延等优点。
This protocol not only allocates upstream bandwidth dynamically, but also has the consistency of traffic management, high bandwidth efficiency and low cell delay.
研究结果表明，增大缓冲器容量可以降低信元丢失率，但会增大时延和时延抖动。
The analysis shows that although loss probability decreases through expanding buffer capacity, delay and delay jitter increase, whose effect on QOS will not be negligible.
信元时延对CBR流量有着重要影响。
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