User`s manual

VPort 251 User’s Manual Introduction
Overview
The VPort 251 is a high performance, 1-channel video encoder with compact form factor that is
suitable for installation in a variety of locations, including outdoor camera cabinets. To make
installation easier, the VPort 251 supports both panel mounting and DIN-Rail mounting (with
DK-35A accessory), and 1 loop-through power output for powering an analog camera. In addition,
the VPort 251 provides up to full D1, full frame rate video performance (NTSC: 720 x 480 up to
30 FPS; PAL: 720 x 576 up to 25 FPS) and supports both MPEG4 or MJPEG, making it especially
well suited for use with distributed video surveillance systems. A 2-way audio function is also
provided for the convenience of real-time communication between system administrators located
at the central site, and engineers in the field.
High Performance MJPEG/MPEG4 compression
Video input can be efficiently compressed into MJPEG/MPEG4 video stream packets without
delay. This is all done without sacrificing remote monitoring capability or storage. Five levels of
compression quality and five different image resolutions are provided to provide greater
versatility.
2-way audio supported for a complete surveillance solution
The VPort 251 supports both audio input and audio output for voice over IP communication
between a field site and central site. The 2-way audio function not only saves time, but also saves
the cost of needing to add additional communication devices (such as a phone).
Compact design and loop-through power output for camera housing installation
The VPort 251 is compact enough to meet a variety of installation requirements, especially as far
as the camera housing is concerned. In general, video cameras used in outdoor environments will
rely on the camera housing to protect the camera from rain, dust, temperature, and other
environmental factors. In addition, the VPort 251 provides a loop-through power output to power
an analog camera. This means that the VPort 251 can be installed with analog cameras in an
outdoor camera housing.
RTSP streaming for easy integration
RTSP (Real-time Streaming Protocol) is a client-server multimedia presentation control protocol,
which enables the interoperability of video devices and software. Hardware or software that
supports RTSP streaming can easily identify and decode the video stream without the hassle of
codec installation. For example, users can view video images from the VPort 251 directly with
Quick Time and VLC, both of which support RTSP streaming.
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