TANDBERG Compliance Appliance Deployment Manual - page 11
3 Defining the compliance policy
7
3.4 How many TCAs: what resolution to record
Once you know the number of endpoints, you need to know the total bandwidth of all the endpoints
the customer wants to record at the same time. This determines how many TCAs you need to be able to
record the peak volume without overstepping the maximum volumes the TCA can receive and
transcode.
The TCA can record up to 100 streams (i.e. 50 point-to-point calls) at 1 megabit/second
so if the peak volume is likely to exceed that then you need another TCA. Note that limit
is regardless of bandwidth, so even if each stream was 384 kb/s, the TCA would still only
record 100.
Bandwidth is a function of the resolution of a call, so an organization that has 30 high-definition calls
producing 4 mb/s has much higher bandwidth requirements than one running 10 calls from
videophones at 384 kb/s.
The TANDBERG Management System (TMS) provides a range of reports that can help you to work out
the average and peak bandwidths of the organization.
3.4.1 Example: General Mortgage Bank
GMB’s board meets on the 15
th
of each month via video conference from the boardrooms in London,
New York and Tokyo. On these days the three boardroom endpoints generate six high-definition
streams of 4 mb/s, or 24 mb/s in total, for about ten hours.
While the board is meeting, the traders in London are still using their videophones, generating about 17
mb/s (384 kilobits*44) giving a peak load on these days of about 41 mb/s for ten hours. This is well
within the 100 mb/s capacity of a single TCA to store and transcode, but the bank decides it might be
good idea to install a second one anyway to provide redundancy.