Description: This attribute is not applicable and is ignored for CQC-based ATM cards.

This attribute specifies the emission priority (EP) which is used to transmit traffic of the UBR service category. A lower numerical value for this attribute specifies a higher emission priority. 0 is the highest EP and 7 is the lowest. Cells at a higher emission priority receive higher preference for link bandwidth. EPs 0 and 1 are in the absolute priority range, and are unaffected by any minimum bandwidth guarantees. EPs 2 through 7 are in the guaranteed bandwidth range. Minimum bandwidth guarantee is specified in the AtmIf/n Ep/m component.

Emission priority setting must comply with all of the following constraints: 1. The emission priority numbers must be in the following order: CBR <= rt-VBR <= nrt-VBR <= ABR <= UBR 2. Two different ATM service categories may share the same EP only if they are both shaped. 3. CBR and rt-VBR may be placed either in the absolute priority range (EP 0 or 1) or in the guaranteed bandwidth range (EP 2 through 7). 4. If both CBR and rt-VBR are shaped, rt-VBR must share the same EP with CBR or ABR. If either one of CBR or rt-VBR are not shaped, then they cannot share the same EP. 5. ABR service category is always deemed to be shaped. If nrt-VBR is shaped, it must share the same EP with ABR. If nrt-VBR is not shaped it must have a higher EP than ABR. 6. If UBR is shaped, it must share the same EP with ABR. If UBR is not shaped, it must have a lower EP than ABR.

This attribute does not apply to standard Vpt Vccs and basic Vpts.