DekTec DTC-720 Xpect - Manual (Page 10)

DTC-720 Xpect ® – 24/7 Transport Stream Monitoring
USER MANUAL
10
For example, suppose you have a setup with 4 transport streams, with pre- and post-trigger buffer
sizes of respectively 32MB and 16MB, a maximum of 16 capture files are stored on disk, the number
of log entries is limited to 100,000 and the number of short-, medium- and long-term statistics entries
is set to 60, 60 and 48 respectively, the number of services is 8, number of basic streams is 40 and
the number of tables is 60. In this case the total hard disk space required would be:
HD
CAP
= (32 + 16) × (212 ÷ 188) × 32 = ~866MB
HD
LOG
= 100,000 × 1kB = ~98MB
HD
STAT
= (60 + 60 + 48) × (8 + 40 + 60) × 1kB = ~18MB
HD
REQ
= 4 × (866 + 98 + 18) = ~3928MB
NOTE: in the above formulae we do not account for the disk space required for installing Xpect,
however, this is a relatively small amount (<100MB) that can be disregarded.
2.4 Number of DekTec cards
It is important to consider the number and type of DekTec input cards (DVB-ASI, DVB-T, DVB-S(2),
TSoIP, etc.) required for your setup. The number of cards needed depends largely on the number of
transport streams you will be monitoring. The number of cards used will have an impact on the number
of available PCI/PCIe slots your target PC will need to have. If the number of PCI/PCIe slots in your
target PC is limited, it is worthwhile considering the use of a DekTec card with multiple input channels
on a single board (if available for the type of interface you need). See our website for details of the
currently available input cards ( www.dektec.com ).
2.5 Number of licence points
Xpect uses a point-based licensing system (see §1.2 Licensing). The number of licence points required
depends on the number of transport streams you will be monitoring and the type of transport stream
(single- or multi-program).
The formula below can be used to compute the number of required points:
LP
TOT
= (N
SPTSRAD
× LP
SPTSRAD
) + (N
SPTSTV
× LP
SPTSTV
) + (N
MPTS
× LP
MPTS
), where
LP
TOT
= Number of licence points required
N
SPTSRAD
= Number of single-program radio transport streams to monitor
LP
SPTSRAD
= Number of licence points (=¼) required for each SPTS Radio
N
SPTSTV
= Number of single-program TV transport streams to monitor
LP
SPTSTV
= Number of licence points (=½) required for each SPTS TV
N
MPTS
= Number of multi-program transport streams to monitor
LP
MPTS
= Number of licence points (=4) required for each MPTS
For example, suppose you have a setup where you want to monitor eight radio SPTS streams, two TV
SPTS streams and three MPTS streams:
LP
TOT
= (8 × ¼) + (2 × ½) + (3 × 4) = 15 licence points