Specifications

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KNOW-HOW: Digital Recording
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S11
Software tools which are additionally available for some DVRs, make
the programming and administration considerably easier. At the same
time, the software offers additional features like printing and storing on
external computers.
Security
The units are protected against access and tampering with passwords.
In some cases, several levels can be created for different user groups
with different access rights.
Continuous recording
If the end of the hard disk capacity is indicated, the recording can au-
tomatically be continued from the start again; the oldest recordings
are then deleted in blocks. If longer periods of times are to be kept, the
recording is stopped so that the hard disk can be exchanged.
Hard disks
Even though they are standard hard disks, only the types of hard disks
are to be used which have been recommended and tested in order to
establish a safe operation. Generally, a respective list can be found in
the instruction manuals. The max. oper-ating capacity has to be con-
sidered, too. In principle, the PC cannot read the recording format of
the hard disk. In order to read the data, the same type of unit is re-
quired
each time. There is a special external reading frame with
respective
software available for some units.
Maintenance
Most of the DVRs which are made nowadays do not need any main-
tenance anymore. Wear and tear parts which wear down during
recording as we know from the analog tape recording, do no longer
exist. Nevertheless, it is recommended, depending on the location
where the unit is installed, to check the ventilation slots and the func-
tionality of the built-in fansregularly, so that dust doesn't make the cool-
ing of the units more difficult.
Data export
It is possible to export digital picture sequences directly by using net-
work connections or additional USB outputs. Depending on the type of
unit, data can directly be transferred to a PC or a picture viewing pro-
gramme is supplied with the unit to allow for that.
Depending on the type of unit, current DVRs nowadays combine
features of
several conventional video products which previously had
to be selected as individual components:
G Colour and B/W recording
G Multiplexer functions
G Video motion detector for each camera
G Video loss detector
G Connection to LAN and ISDN (optional)
G Password protection
G Alarm section with inputs and outputs
G Feed-through outputs
DMR-416, see page S 2