
PXB 4330
Operational Description
Data Sheet
4-52
09.99
4.4
Setup of Queues
Before assigning a connection to a new queue, it should be verified to be empty, as some
cells could remain from the previous connection (see
Section 4.5
).
4.5
Teardown of Queues
Disabling a queue via the queue-disable bit does not clear the cells contained in the
queue, but:
The acceptance of the queue for new cells is disabled
The queue is still served, but the cells are discarded
Normally, at the time a queue is cleared, there will be no more cells in the queue. This
can be checked by reading the queue length.
In case of a highly filled queue which is served slowly, the time to empty the queue could
be long. To deplete the queue more quickly, its weight can be increased temporarily.
However, because the discarded cells produce idle times on the UTOPIA output, the
chosen weight factor should not be too high.
BufNrtMax
Defines maximum number of non-real-time cells
allowed in the entire buffer for this traffic class in steps
of 256
6-95
BufNrtEPD
Defines threshold for EPD/maximum
1)
for this traffic
class for the entire buffer in steps of 256
6-95
TrafClassMax
Defines maximum number of cells for this traffic class
in steps of 256
6-98
SbMaxEpdCi
Defines threshold for EPD/maximum
1)
for this traffic
class in the Scheduler in steps of 256
6-98
QueueMaxEPD
Defines threshold for each queue for EPD/maximum
1)
for this traffic class in steps of 64
6-95
QueueCICLP1
Combined threshold for each queue for CI indication
(ABR) and CLP=1 cell discard in case of CLPT=0 in
steps of 4
6-95
1)
mixed threshold: EPD if enabled; otherwise, maximum threshold
Abbreviation
Description
See
page