Cell Relay Archive

[Daniel Horner <dnh@nortelnetworks.com>]

Hi, 

I'm wondering about the simultaneous application of EPD and PPD. Is
there a benefit to using both of these discard policies at once? If I
understand correctly, then PPD would still catch the tail-end of
frames that "snuck past" the EPD threshold. Ie. the beginning of the
AAL5 frame was transmitted when the queue was just under the EPD
threshold.

Also, I'm wondering about how EPD threshold values are generally
chosen. For systems that implement per-vc queueing, is it wiser to
pick a percentage of the buffer size (what numbers are typical?), or
subtract the expected AAL5 PDU size from the buffer size.

Thanks Kindly, 
 Dan