DVR Security System Review

 

The Axis 250S video server is designed to transmit the output of attached surveillance cameras over a network, the video server is compatible with both PAL and NTSC video signals.  The Axis 250S uses MPEG-2 video compression and you can configure the amount of bandwidth the device uses to transmit video.  You can configure the device to transmit video to attached clients, the devices bit rate can be set to stream video between the ranges of 0.25 and 8 mega bits per second.

There is no limit on the amount of clients that can view the video stream from the device providing they are using the same LAN.  This feature could prove useful if you need to set up multiple monitoring stations.  One BNC composite input is built in to the video server to accommodate surveillance cameras.  In NTSC mode the video sever has a maximum pixel resolution of 720*480, in PAL mode the maximum image resolution is 720*576.

Audio streams can also be routed to the device so you can hear the activities in the vicinity of your surveillance cameras.  To handle audio the video server has a stereo microphone input as well as a line input, you can also attach the system to external alarms.  Four digital alarm inputs are built in to the video server, attaching external alarms to it is a means of activating video recording.  You can use the video server to notify you via email when alarms attached to the system are activated.

Pan tilt and zoom cameras can be attached to the Axis 250S, the device is fitted with one RS-485/422 transceiver and one 9 pin D-SUB RS-232 connector.  As far as internal hardware goes the video server has a ETRAX 100 LX 32 RISC CPU, 16 MB of system RAM and a supplementary 4 MB of flash memory.  The video server runs on a 9 volt DC external power supply (Axis PS-K) and this is included with the package.

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