參數(shù)資料
型號(hào)： PXB 4330 E
廠商： SIEMENS AG
英文描述： ATM Buffer Manager(異步傳輸模式緩沖器管理器)
中文描述： 緩沖區(qū)管理器自動(dòng)柜員機(jī)（異步傳輸模式緩沖器管理器）
文件頁數(shù)： 56/61頁
文件大?。?/td> 551K
代理商： PXB 4330 E
PXB 4330 E
Semiconductor Group
56
Application Note 11.98
As is apparent in
Table 13,
the granularity for rates below 10 Mbit/s (i.e. for n
i
’s > 100)
is < 1%. In all 10 Mbit/s can be assigned to all VBR-nrt queues together. W
i
of 10 Mbit/s
is W
100
=1/100=0.01. Hence the following equation has to be fulfilled:
(2)
Table 13
Correlation Between WFQ Factor n
i
and Granularity
WFQ Factor n
i
Weight
Factor W
i
n
1
=1
1
1 Gbit/s = GR
max
:
:
:
n
99
=99
1/99
1 Gbit/s / 99 = 10.101 Mbit/s
n
100
=100
1/100
1 Gbit/s / 100 = 10 Mbit/s
n
101
=101
1/101
1 Gbit/s / 101 = 9.9009 Mbit/s
n
102
=102
1/102
1 Gbit/s / 102 = 9.8039 Mbit/s
:
:
:
n
15359
=15359
1/15359
1 Gbit/s / 15359 = 65.108 kbit/s -
n
15360
=15360
1/15360
1 Gbit/s / 15360 = 65.104 kbit/s
= GR
min_15360
Guaranteed Rate GR
Deviation between
n
i-1
and n
i
in %
not allowed
not allowed
not allowed
1%
0.991%
0.979%
:
1)
1)
GR
min
in equation (2) of [
1
], page 95 is the GR
min_16384
because (2) describes the calculation in the ABM which
works with the value 2
14
(= 16384). However due to HW limitations only n
i
’s from 1 to 15360 can be used for
rate assignments. That means GR
min
in (2) is only a theoretical value which never will be reached.
0.006%
W
i
0 01
≤
VBR
nrt
–
∑
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