TANDBERG MCU
63
Appendices
Appendix 3: Capacity
MCU Capacity - calculation
The total capacity in the MCU is defined by the following rules:
1)
Software version defines maximum number of sites:
8+8
-> Maximum 8 video sites and maximum 8 telephones
16+16 -> Maximum 16 video sites and maximum 16 telephones
2)
The total system bandwidth (ISDN/IP) is 7680 kbps (120x64kbps) regardless of software version.
3)
In addition, each call has a weight depending on bandwidth/encryption:
Bandwidth
Teleph.
64
128
192
256
320
384
512
768
1152
1472
1920
Non-encr.
11
37
40
41
42
44
46
54
62
80
88
110
Encrypted
N/A
53
59
60
61
68
73
84
111
N/A
N/A
N/A
The sum of the call weights cannot exceed 845. Users will be prevented from setting up calls that exceeds this limit.
Example:
If the MCU has made 6 calls at 768, 4 calls at 384, and 4 encrypted calls at 192 the calculation will be:
6x62 + 4x46 + 4x60 = 372 + 184 + 240 = 796. Since 796 is less than 845, this will be possible.
MCU Capacity – typical scenarios (16 video sites and 16 telephony calls option)
Below some typical capacity scenarios are listed. They can be derived by the calculation above:
Bandwidth
Non-encrypted
Encrypted
128 kbps
16 +16*
14
256 kbps
16+15
13
384 kbps
16+9
11
512 kbps
15+0**
10
768 kbps
10+0**
7
1472 kbps (1.5Mbps)
5+5
N/A
1920 kbps (2Mbps)
4+0**
N/A
* 16+16 indicates 16 video sites and 16 telephones.
** Limited by the maximum capacity 7680 kbps, see 2) above.
Cascaded Conference Capacity
Up to seventeen MCUs (one master and up to sixteen slaves) can be cascaded together in one big conference, giving a
total number of 240 participants.
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