cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 183
cn8236
Manufacturer Part Number
cn8236
Description
Atm Servicesar Plus With Xbr Traffic Management
Manufacturer
Mindspeed Technologies
Datasheet
1.CN8236.pdf
(443 pages)
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CN8236
ATM ServiceSAR Plus with xBR Traffic Management
Figure 6-7. Assigning CBR Cell Slots
28236-DSH-001-B
6.2.3.2 Available Rates
A
A
A
A
A
A
A
A
A
A
00
10
20
30
40
50
60
70
80
90
C
01
11
21
31
41
51
61
71
81
91
02
12
22
32
42
52
62
72
82
92
Once a maximum rate
determines the rate granularity and minimum rate. The system designer specifies
the number of table slots in SCH_SIZE(TBL_SIZE). The available CBR rates are
as follows:
Minimum Rate
The minimum rate available is therefore
Assigning CBR Cell Slots
Figure 6-7
CBR channels, each with a different rate. In this example, TBL_SIZE = 100 and
SLOT_PER = 93. VCC_INDEX A occupies every tenth schedule slot; therefore,
it transmits at R/10, or 35.4 K cells/second. VCC_INDEX B occupies a slot every
25 cell slots and transmits at a rate of R/25, or 14.2 K cells/second. VCC_INDEX
C occupies only one schedule slot and therefore transmits at the minimum rate,
R/TBL_SIZE, or 3.54 K cells/second. Not all cell slots have been assigned to
CBR channels. During these slots, the CN8236 dynamically schedules traffic
from the other service classes. However, the total bandwidth of channels A, B,
and C is reserved.
03
13
23
33
43
53
63
73
83
93
SCHEDULE TABLE
Mindspeed Technologies
R
B
B
displays an example of a Schedule table with slots assigned to various
max
TBL_SIZE, ... ..., R
04
14
24
34
44
54
64
74
84
94
, R
max
05
15
25
35
45
55
65
75
85
95
(TBL_SIZE 1)
(R
06
16
26
36
46
56
66
76
86
96
max
)
max
has been selected, the size of the Schedule table
07
17
27
37
47
57
67
77
87
97
TBL_SIZE
–
08
18
28
38
48
58
68
78
88
98
TBL_SIZE, R
B
B
™
R
6.2 xBR Cell Scheduler Functional Description
09
19
29
39
49
59
69
79
89
99
max
/ TBL_SIZE
max
SCHEDULE SLOT
B
(TBL_SIZE 2)
29
.
6.0 Traffic Management
VCC_INDEX = B
–
8236_039
6-15
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