У Алкателя нужно смотреть доку по конкретной железке + конкретной adapter card + версии софта.
Например на 7705 SAR OS:
"This command overrides the default Committed Buffer Space (CBS) reserved for buffers of a specified
queue. The value is configured in kilobytes.
The value in kilobytes is converted automatically to the number of buffers. The conversion calculation
uses a non-configurable buffer size of 2304 bytes or 512 bytes, depending on the type of adapter card.
See Table 4 for a list of adapter cards and their associated buffers. The calculation is:
Number of buffers = Configured CBS value in bytes / Buffer size in bytes
At the egress of an N > 1 Apipe, the CBS value in a SAP egress QoS policy that is assigned to a SAP
aggregation group causes n times that value of buffers to be committed, where n is the number of SAPs
in the SAP aggregation group. See the show pools command for information about how to view buffer
pools for SAPs that are members of a SAP aggregation group. See the 7705 SAR OS Services Guide
for information about how to configure SAP aggregation groups.
Default “default”
(8 kbytes for adapter cards and platforms with 512 byte buffer size)
(18 kbytes for adapter cards and platforms with 2304 byte buffer size).
Parameters size-in-kbytes — this parameter is an integer expression of the number of kilobytes reserved for
the queue. A value of 0 specifies that no reserved buffers are required by the queue (a minimal
reserved size can still be applied for scheduling purposes).
Values 0 to 131072
default — returns the CBS size to the default value"
