User`s manual

Choosing Your Application AXIS 2120 User’s Manual

Picture frequency for Networking Applications

When used in a TCP/IP networking environment, the AXIS 2120 delivers up to 25/30

(PAL/NTSC) images/second; where the actual image frequency is typically limited by:

• your computer and browser

• the chosen image resolution and compression

• the lighting conditions at the point of installation

• available network bandwidth

• the complexity of detail and color variation within the image

Important!

Image Compression Ratios

Although the file size of a JPEG-compressed image depends upon the actual content of the

image, images containing a lot of detail generally generate larger files. Image quality is

largely controlled by the level of compression; where high compression yields small files,

and low compression maintains higher image quality at the expense of larger files. The

table below is derived from real-life tests, and defines the average file sizes for each

supported image resolution:

* Maximum performance for a single viewing client.

** Interlaced image

Note: Using a modern computer will avoid introducing any unnecessary constraints on the imaging fre-

quency.

60Hz and 50Hz variants of the AXIS 2120 are available to accommodate the different power supply fre-

quencies found in the USA and Europe.

The 60Hz variant delivers a resolution of 525 lines at 60 half-frames per second and is suitable for use in

the United States; whereas, the 50Hz variant delivers 625 lines at 50 half-frames per second and is

appropriate for use in Europe.

60Hz (NTSC Countries) 50 Hz (PAL Countries)

Resolution Filesize (kb) Max fps* Resolution Filesize (kb) Max fps*

4CIF (704 x 480) ** 7 - 150 10 4CIF (704 x 576) ** 8.5 - 180 8

CIF (352 x 240) 1.4 - 40 30 CIF (352 x 288) 1.7 - 50 25