TANDBERG Compliance Appliance Deployment Manual - page 37
10 Sample TCA calculator
33
10 Sample TCA calculator
You can download this spreadsheet from www.tandbergnpd.com
# SIP endpoints
20000
# H.323 endpoints
300
# HD/Telepresence
4
Call Speed (Kbs)
384
Call Speed
768
Call Speed
2048
Average Duration of call (hours)
1
Average Duration of call
1
Average Duration of call
1
Resolution
CIF
Resolution
4CIF
Resolution
HD
Resolution, framerate and codec not used in calculations at
present
Framerate
25
Framerate
25
Framerate
30
Video Codec
h.264
Video Codec
h.263
Video Codec
h.264
Future Growth (per year)
10%
Future Growth
0%
Future Growth
10%
# Calls per day
2031
Total number of calls (see TMS CDR reports to gain accurate stats)
Peak concurrent calls
203
At peak times (exchange open/close?) how many calls (Can get from TMS CDR reports)
% multipoint
10.00%
Of these calls, how many are multipoint, hosted on a MCU
Avg# Endpoints in multipoint
4
Store multiview only
no
CA has a config option to only store the multipoint view being sent from the MCU, rather than each endpoint stream
Hours
Growth
MB
per CA
% SIP calls per day
70%
1421.7
1563.87
191929.5
% H.323 calls per day
20%
406.2
406.2
109674
% HD calls per day
10%
203.1
223.41
146232
2031
2193.48
447835.5
74639.25
4825.66
Retention Period (months)
6
Archived Quality (Kbs)
768
Format will always be MPEG4, resolution and framerate will be dropped to meet this bandwidth. We'll keep audio quality high.
Hours of business
8
Gives us an idea of when the box will be idle so that it can transcode with full power
# of VCS
2
Not used in any calculations just yet, but peak concurrent call number must match licensed calls on VCSes
# of CAs
6
# Peak streams through each CA
74.43
Each point to point call counts for 2 media streams
Peak bandwidth through each CA (Mbs)
45.59
Bandwidth is the maximum possible, endpoint codecs should be reducing the total bandwidth of the call speed over the life of a call
# Hours recorded per day in total
4468.2
Each endpoint stream in a point to point plus only the multipoint stream if that option is selected. Otherwise a stream for each (avg#) endpoint in multipoint
Internal disk per day on each CA (GB)
164.21
10 bits in a byte, 1000MB in a GB used in this calculation
External storage per day in total (GB)
1206.41
Total internal disk divided by the quality reduction ratio
Transcoding Deficit In Day for each CA
791
Assumes TCA will only transcode when it is not taking calls, so 24 hours - 8hours for a business day = 16 hours to transcode on all CPU resources
Transcoding Deficit in 7 day Week
8565
This assumes that the weekend is available for transcoding, negative is bad.
Transcodes per CA if 1 hour conferences
96
8 cores x the realtime transcode rate. May be much higher if video codec is h.264 as transcoding burden will be less
Transcode rate x realtime
12
We may be able to calculate this more precisely when taking the codec, framerate and resolution settings into account. This value is output to CIF on a low-end server. Higher resolutions = slower transcode
(XGA = 2x)
External storage required:
week (GB)
6,032.07
5 days in a week
month (GB)
26,541.11
22 days in a month
Retained (GB)
159,246.65
16459.2
Cost of storage (GB)
$20.00
Total cost for retained video
$3,184,932.96
Retained next year (GB)
171,986.38