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10.3.2. Load Calculation for a HG 3500 Previous topic Parent topic Child topic Next topic

Calculation of the high-priority load for a HG 3500

Table 59. High-priority load of a HG 3500 (G.711/20 ms sample size)

Protocol
Data type
Maximum bit rate/ port
[Kbps]
Total bit rate [Kbps] with
N payload ports
N=30
N=60
N=120
RTP
VoIP
88.8
2,664
5,328
10,656
RTCP
VoIP
0.2
6
12
25
Total load
2,670
5,340
10,681
In addition to high-priority load, low-priority load portions may also arise in certain situations for the following:
  1. SNMP queries via network management
    • TAP/Service PC access at the access point
    • FTP-loading of a new HG 3575 loadware as a background task

High-priority load of a HG 3500 as a function of codec type and sample size

Table 60. High-priority load of a HG 3500 as a function of codec and sample size

Codec type
Sample size
RTP load [Kbps] with
N payload ports
Total Ethernet load [Kbps]
with N payload ports
N=30
N=60
N=120
N=30
N=60
N=120
G.711
20
2,664
5,328
10,656
2,670
5,412
10,760
G.711
30
2,416
4,832
9,664
2,490
4,916
9,768
G.711
60
2,168
4,336
8,672
2,242
4,420
8,776
G.729A
20
984
1,968
3,936
1,058
2,052
4,040
G.729A
40
612
1,224
2,448
686
1,308
2,552
G.729A
60
488
976
1,952
562
1,060
2,056
Note
This appraisal must be treated with caution, as the utility of the G.729A codec is limited by various factors:
  1. The call is transferred uncompressed if one of the subscribers/circuits involved prevents compression
    • Connections with fax, modem and data terminal devices are only transferred uncompressed
    • External music and announcements are mostly transferred uncompressed (depends on the configuration (RCSU-CLASSMRK))
    • Connections to a conference unit are mostly switched without compression (depends on the configuration (ZAND-IPDAVCCF))
    In all of these cases, either G.711 is used, or no codec at all.
    The bit rates for G.711 thus apply.
    In order to guarantee that bandwidth bottlenecks are never encountered, the access point link must be designed for the G.711 bit rate.
By means of statistical appraisals, taking the actual configuration into account (how many fax/data devices are actually deployed, how many compression licenses are available, are all possible subscriber/access circuits configured for compression, how frequently are conferences used), a mixed calculation can be performed.
The load as a function of a sample size can only be used if it is ensured that all IPDA components are configured exclusively for this sample size. Otherwise, the worst value for the respective codec type would have to be used for reasons of reliability.

High-priority load of a HG 3500 as a function of the maximum number of B-channels

Table 61. High-priority load of a HG 3500 as a function of the permissible number of B-channels

Maximum permissible number of B-channels
Total Ethernet load at G.711/20ms
[Kbps]
Total Ethernet load at G.711/30ms
[Kbps]
Total Ethernet load at G.711/60ms
[Kbps]
1
89
81
72
2
178
161
145
3
267
242
217
4
356
323
290
5
445
404
362
6
534
484
435
7
623
565
507
8
712
646
580
9
801
727
652
10
890
807
725
11
979
888
797
12
1,068
969
870
13
1,157
1,050
942
14
1,246
1,130
1,015
15
1,335
1,211
1,087
16
1,424
1,292
1,160
17
1,513
1,373
1,232
18
1,602
1,453
1,305
19
1,691
1,534
1,377
20
1,780
1,615
1,449
21
1,869
1,696
1,522
22
1,958
1,776
1,594
23
2,047
1,857
1,667
24
2,136
1,938
1,739
25
2,225
2,019
1,812
26
2,314
2,099
1,884
27
2,403
2,180
1,957
28
2,492
2,261
2,029
29
2,581
2,341
2,102
30
2,670
2,422
2,174
31
2,759
2,503
2,247
32
2,848
2,584
2,319
33
2,937
2,664
2,392
34
3,026
2,745
2,464
35
3,115
2,826
2,537
36
3,204
2,907
2,609
37
3,293
2,987
2,682
38
3,382
3,068
2,754
39
3,471
3,149
2,827
40
3,560
3,230
2,899
41
3,649
3,310
2,971
42
3,738
3,391
3,044
43
3,827
3,472
3,116
44
3,916
3,553
3,189
45
4,005
3,633
3,261
46
4,094
3,714
3,334
47
4,183
3,795
3,406
48
4,272
3,876
3,479
49
4,361
3,956
3,551
50
4,450
4,037
3,624
51
4,539
4,118
3,696
52
4,628
4,199
3,769
53
4,717
4,279
3,841
54
4,806
4,360
3,914
55
4,895
4,441
3,986
56
4,984
4,522
4,059
57
5,073
4,602
4,131
58
5,162
4,683
4,204
59
5,251
4,764
4,276
60
5,340
4,844
4,348
61
5,429
4,925
4,421
62
5,518
5,006
4,493
63
5,608
5,087
4,566
64
5,697
5,167
4,638
65
5,786
5,248
4,711
66
5,875
5,329
4,783
67
5,964
5,410
4,856
68
6,053
5,490
4,928
69
6,142
5,571
5,001
70
6,231
5,652
5,073
71
6,320
5,733
5,146
72
6,409
5,813
5,218
73
6,498
5,894
5,291
74
6,587
5,975
5,363
75
6,676
6,056
5,436
76
6,765
6,136
5,508
77
6,854
6,217
5,581
78
6,943
6,298
5,653
79
7,032
6,379
5,725
80
7,121
6,459
5,798
81
7,210
6,540
5,870
82
7,299
6,621
5,943
83
7,388
6,702
6,015
84
7,477
6,782
6,088
85
7,566
6,863
6,160
86
7,655
6,944
6,233
87
7,744
7,024
6,305
88
7,833
7,105
6,378
89
7,922
7,186
6,450
90
8,011
7,267
6,523
91
8,100
7,347
6,595
92
8,189
7,428
6,668
93
8,278
7,509
6,740
94
8,367
7,590
6,813
95
8,456
7,670
6,885
96
8,545
7,751
6,958
97
8,634
7,832
7,030
98
8,723
7,913
7,103
99
8,812
7,993
7,175
100
8,901
8,074
7,247
101
8,990
8,155
7,320
102
9,079
8,236
7,392
103
9,168
8,316
7,465
104
9,257
8,397
7,537
105
9,346
8,478
7,610
106
9,435
8,559
7,682
107
9,524
8,639
7,755
108
9,613
8,720
7,827
109
9,702
8,801
7,900
110
9,791
8,882
7,972
111
9,880
8,962
8,045
112
9,969
9,043
8,117
113
10,058
9,124
8,190
114
10,147
9,205
8,262
115
10,236
9,285
8,335
116
10,325
9,366
8,407
117
10,414
9,447
8,480
118
10,503
9,527
8,552
119
10,592
9,608
8,624
120
10,681
9,689
8,697
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