- ,
- , or
- .

**Relative delay constraints (RDC)**specify a proportional delay differentiation between classes. As an example, for two classes and , the RDC enforces a relationship

**Absolute delay constraints (ADC)**: An ADC on class requires that the delays of class satisfy a worst-case bound .**Relative loss constraints (RLC)**specify a proportional loss differentiation between classes.**Absolute loss constraints (ALC)**: An ALC on class requires that the loss rate of class be bounded by an upper bound .**Absolute rate constraints (ARC)**: An ARC on class means that the throughput of class is bounded by a lower bound .

JoBS does not rely on admission control or traffic policing, nor does it
make any assumption on traffic arrivals.
Therefore, a system of constraints may become infeasible, and
some constraints may need to be relaxed.
QoS constraints are prioritized in the following order.

That is, if JoBS is unable to satisfy both absolute and relative constraints, it will give preference to the absolute constraints.

Tom Henderson 2011-11-05