DATASHEET

AXIS 241Q/241S Video Servers
Bringing network video benefits to analog surveillance systems.
> High quality, de-interlaced video > Simultaneous Motion JPEG and MPEG-4 streams > Video motion detection > Support for PTZ and dome cameras > Comprehensive security features
AXIS 241Q/241S Video Servers enable analog cameras to be integrated into an IP-based video surveillance system, providing users with the benefits of professional network video technology.
AXIS 241Q/241S Video Servers convert analog video signals into high quality, de-interlaced, digital video streams that are sent over an IP network. AXIS 241Q features four analog channels and AXIS 241S features one channel. Both models are available as standalone units or blade versions for rack solutions. MPEG-4 and Motion JPEG streams can be sent simultaneously from each channel and at full frame rate. This allows users to have different viewing and recording settings that are optimized for image quality and efficient bandwidth/storage use. AXIS 241Q/241S Video Servers provide powerful event management functions. Events can be triggered for example by video motion detection and external input devices, and responses can include image upload, alarm notifications and activation of external devices such as lights, doors or alarms. The video servers serial ports enable pan/tilt/zoom control of PTZ cameras and PTZ dome cameras over the network. AXIS 241Q/241S Video Servers offer comprehensive security features such as multiple user access levels, IP address filtering, HTTPS encryption and IEEE 802.1X.
Technical specifications AXIS 241Q/241S Video Servers
Video encoder Models Video compression Resolutions Frame rate MPEG-4 Frame rate Motion JPEG Video streaming Image settings AXIS 241Q*: Four video channels AXIS 241S*: One video channel *Also available as blade versions for Axis Video Rack Solution MPEG-4 Part 2 (ISO/IEC 14496-2) Motion JPEG 160x120 to 704x576 AXIS 241Q: Up to 20/17 (NTSC/PAL) fps at CIF AXIS 241S: Up to 30/25 (NTSC/PAL) fps at 2CIF, 21/17 fps at 4CIF AXIS 241Q: Up to 30/25 (NTSC/PAL) fps at CIF AXIS 241S: Up to 30/25 (NTSC/PAL) fps at 4CIF Simultaneous MPEG-4 and Motion JPEG Controllable frame rate and bandwidth VBR/CBR MPEG-4 Compression, color, rotation, aspect ratio correction, mirroring Text and image overlay Privacy mask De-interlace filter Wide range of analog PTZ cameras supported (drivers available for download at www.axis.com) 20 presets/camera Guard tour PTZ control queue Supports Windows compatible joysticks Password protection, IP address filtering, HTTPS encryption, IEEE 802.1X network access control, digest authentication, user access log IPv4/v6, HTTP, HTTPS, QoS layer 3 DiffServ, FTP, SMTP, Bonjour, UPnP, SNMPv1/v2c/v3(MIB-II), DNS, DynDNS, NTP, RTSP, RTP, TCP, UDP, IGMP, RTCP, ICMP, DHCP, ARP, SOCKS System integration Open API for software integration, including VAPIX Application from Axis Communications available at www.axis.com Programming Interface Intelligent video Video motion detection, active tampering alarm Alarm triggers Alarm events Video buffer General Casing Processors and memory Power Connectors Intelligent video, external inputs, video loss File upload via FTP, HTTP and email Notification via email, HTTP and TCP External output activation 9 MB pre- and post-alarm per channel Metal casing Standalone, stackable or with brackets for wall or cage mount AXIS 241Q: ARTPEC-2, 64 MB RAM, 8 MB Flash AXIS 241S: ARTPEC-2, 32 MB RAM, 8 MB Flash V DC, max 8 W Analog composite video NTSC/PAL auto-sensing: AXIS 241Q: 4 BNC inputs AXIS 241S: 1 BNC input and 1 BNC output: loopthrough or Y/C video input RJ-45 10BaseT/100BaseTX Terminal block: I/O terminal block for four configurable inputs/outputs RS-485/ RS-422 D-sub for RS-232 port C (F) Humidity 20 80% RH (non-condensing) EN 55022 Class B, EN 61000-3-2, EN 61000-3-3, EN 55024, FCC Part 15 Subpart B Class B, ICES-003 Class B, VCCI Class B, C-tick AS/NZS CISPR 22, EN 60950 Power supply: EN 60950-1, UL, cUL 540 g (1.2 lbs) Power supply, mounting and connector kits, Installation Guide, CD with installation and management tools, software and Users Manual, 1 Windows decoder user license

Pan/Tilt/Zoom

Network Security Supported protocols
Operating conditions Approvals
Weight Included accessories
More information is available at www.axis.com

Dimensions

Inputs/Outputs Power adaptor connector Network connector Inputs/Outputs

RS-232 connector

Optional accessories
AXIS Rack Solution RS-232 connector AXIS 295 Video Surveillance Joystick

136 mm (5.4)

42 mm (1.7)
Power adaptor connector 241Q

Network connector

155 mm (6.1) 140 mm (5.5)
241Q Video input x4 241S Video input x4 Video input 241S Video output
For information on AXIS Camera Station and video management software from Axis Application Development Partners, see www.axis.com/products/video/software/

Video input

Video output
2008 Axis Communications AB. AXIS COMMUNICATIONS, AXIS, ETRAX, ARTPEC and VAPIX are registered trademarks or trademark applications of Axis AB in various jurisdictions. All other company names and products are trademarks or registered trademarks of their respective companies. We reserve the right to introduce modifications without notice.

32377/EN/R3/0808

www.axis.com

AXIS 241Q/241S Video Server Users Manual

About This Document

This manual is intended for administrators and users of the AXIS 241Q/241S, with firmware release 4.47. The manual includes instructions for using and managing the Video Server on your network. Previous experience of networking will be of use when installing and using this product. Some knowledge of UNIX or Linux-based systems would be beneficial for developing shell scripts and applications. Later versions of this document will be posted to the Axis web site. See also the products online help, available via the Web-based interface.
Canada - This Class B digital apparatus complies with Canadian

ICES-003.

Japan - This is a class B product based on the standard of the
Voluntary Control Council for Interference from Information Technology Equipment (VCCI). If this is used near a radio or television receiver in a domestic environment, it may cause radio interference. Install and use the equipment according to the instruction manual.

Liability

Every care has been taken in the preparation of this manual. Please inform your local Axis office of any inaccuracies or omissions. Axis Communications AB cannot be held responsible for any technical or typographical errors and reserves the right to make changes to the product and manuals without prior notice. Axis Communications AB makes no warranty of any kind with regard to the material contained within this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Axis Communications AB shall not be liable or responsible for incidental or consequential damages in connection with the furnishing, performance or use of this material.
Safety Notices Used In This Manual
Caution! - Indicates a potential hazard that can damage the product. Important! - Indicates a hazard that can seriously impair operation. Do not proceed beyond any of the above notices until you have fully understood the implications.
Intellectual Property Rights
Axis AB has intellectual property rights relating to technology embodied in the product described in this document. In particular, and without limitation, these intellectual property rights may include one or more of the patents listed at http://www.axis.com/patent.htm and one or more additional patents or pending patent applications in the US and other countries. This product contains licensed third-party software. See the menu item About in the products user interface for more information.
Trademark Acknowledgments
Ethernet, Internet Explorer, Linux, Microsoft, OS/2, UNIX, Windows, WWW are registered trademarks of the respective holders. QuickTime is a trademark of Apple Computer, Inc., registered in the U.S. and other countries. Java and all Java-based trademarks and logos are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. Axis Communications AB is independent of Sun Microsystems Inc. UPnP is a certification mark of the UPnP Implementers Corporation.

Legal Considerations

Camera and audio surveillance can be prohibited by laws that vary from country to country. Check the laws in your local region before using this product for surveillance purposes. This product includes one (1) MPEG-4 decoder license. To purchase further licenses, contact your reseller.

Support Services

Should you require technical assistance, please contact your Axis reseller. If your questions cannot be answered immediately, your reseller will forward your queries through the appropriate channels to ensure a rapid response. If you are connected to the Internet, you can:
Electromagnetic Compatibility (EMC)
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Re-orient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment to an outlet on a different circuit to the receiver. Consult your dealer or an experienced radio/TV technician for help. Shielded (STP) network cables must be used with this unit to ensure compliance with EMC standards.

download user documentation and firmware updates find answers to resolved problems in the FAQ database. Search by product, category, or phrases report problems to Axis support staff by logging in to your private support area visit the Axis Support Web at www.axis.com/techsup/
Safety Notice - Battery Replacement
The Video Server uses a 3.0V CR2032 Lithium battery as the power supply for its internal real-time clock (RTC). This battery will, under normal conditions, last for a minimum of 5 years. Low battery power affects the operation of the RTC, causing it to reset at every power-up. A log message will appear when battery replacement is required. The battery should not be replaced unless required! If the battery does need replacing, observe the following points: Caution! Danger of Explosion if battery is incorrectly replaced Replace only with the same or equivalent battery, as recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions.
USA - This equipment has been tested and found to comply
with the limits for a Class B computing device pursuant to Subpart B of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when operated in a commercial environment. Operation of this equipment in a residential area is likely to cause interference, in which case the user at his/her own expense will be required to take whatever measures may be required to correct the interference.

Europe -

This digital equipment fulfills the requirements for radiated emission according to limit B of EN55022/1998, and the requirements for immunity according to EN55024/1998 residential, commercial, and light industry.
Australia - This electronic device meets the requirements of
the Radio communications (Electromagnetic Compatibility) Standard AS/NZS CISPR22:2006.
AXIS 241Q/241S Video Server Users Manual Revision 2.3 Dated: August 2009 Part No: 36455 Copyright Axis Communications AB, 2008-2009
AXIS 241Q/241S Product description. 6 LED indicators. 7 Switches & connectors. 8 Rear panel. 8 Using AXIS 241Q/241S. 10 Accessing the video server. 10 The Live View page. 11 Video streams. 13 Video stream types. 13 MPEG-4 protocols and communication methods. 14 AXIS Media Control (AMC). 14 How to stream MPEG-4. 14 Other methods of accessing the video stream. 15 Configuring the video server. 17 Accessing the Setup tools. 17 Video & image settings. 18 Image settings. 18 Video source settings. 19 Advanced. 19 Quad Stream settings (AXIS 241Q only). 20 Overlay/Mask settings. 21 Live View Config. 23 Layout. 23 HTML Examples. 26 External Video. 26 Sequence Mode. 26 Event configuration. 27 Event Servers. 27 Event Types. 27 Camera tampering. 30 Motion detection. 30 Port status. 32 Pan Tilt Zoom. 33 Installing PTZ devices. 33 PTZ configuration. 34 PTZ controls. 34

Rear panel

12-pin I/O terminal connector Power adapter connector Network connector RS-232 connector
Serial number on underside label
Power adapter connector - Connect the power adapter.
AXIS 241Q/241S - Product description I/O terminal connector - The I/O terminal connector provides the physical interface to four digital transistor outputs, four digital inputs and an RS-485 interface. See Unit connectors, on page 49 for more information. Note: The I/O terminal connector also provides an auxiliary connection point for DC power. Network connector - The AXIS 241Q/241S connects to the network via a standard network cable, and automatically detects the speed of the local network segment (10BaseT/100BaseTX Ethernet). RS-232 connector - A 9-pin D-SUB connector providing an RS-232 serial connection. Typically used for connecting pan/tilt/zoom devices. See Unit connectors, on page 49 for more information.
10 AXIS 241Q/241S - Using AXIS 241Q/241S

Using AXIS 241Q/241S

The AXIS 241Q/241S can be used with most standard operating systems and web browsers. The recommended browser is Internet Explorer with Microsoft Windows, and Firefox with other operating systems. See also the Technical specifications, on page 58. Note: For information on installing the video server, please refer to the Installation Guide.
Accessing the video server
1. Start your web browser. 2. Enter the IP address or host name of AXIS 241Q/241S in the Location/Address field of your browser. 3. Enter the user name and password set by the administrator. 4. A video image is displayed in your browser.
AXIS 241Q/241S - Using AXIS 241Q/241S Notes:
To view streaming video in Microsoft Internet Explorer, set your web browser to allow the installation of AXIS Media Control (AMC) on your computer. AMC also provides an MPEG-4 decoder for viewing MPEG-4 video streams. This decoder is installed the first time an MPEG-4 video stream is accessed. Please note that the product administrator may have disabled the installation of the decoder, as a license is required for each instance. See page 25 for more information. If your workstation restricts the use of additional software components, the AXIS 241Q/241S can be configured to use a Java applet for updating JPEG images. Please see the online help for more information. When using a browser other than Microsoft Internet Explorer with AMC, instead of a stop, a snapshot and a full screen button, there is a stop and play button in the bottom left corner of the live view page. For a description of these buttons see The Live View page, below.

How to configure Motion Detection 1. Click Motion Detection in the Event Config menu. 2. a) With AMC: Check the radio button Configure Include Windows or Configure Exclude Windows and click New. b) Without AMC: Click Add Window and check the Include to Exclude button. 3. Enter a descriptive name for the new window. 4. Adjust the size (drag the bottom right-hand corner) and position (click on the text at the top and drag to the desired position). 5. Include windows only. Adjust the Object size, History and Sensitivity profile sliders (see table below for details). Any detected motion within an active window is then indicated by red peaks in the Activity window (the active window has a red frame). 6. Click Save. Please use the online help for descriptions of each available option.

Parameter

Object Size Only very large objects trigger motion detection Even very small objects trigger motion detection

History

An object that appears in the region will trigger the motion detection for a long period An object that appears in the region will trigger motion detection for only a very short period Medium to High

Sensitivity

Ordinary colored objects against ordinary backgrounds will trigger the motion detection Only very bright objects against a dark background will trigger motion detection Medium to High

Default values Low

32 AXIS 241Q/241S - Event configuration
Examples: Avoid triggering on small objects in the image by selecting a high size level.
To trigger motion detection as long as there is activity in the area, select a high history level. To only detect flashing light, low sensitivity can be selected. In other cases, a high sensitivity level is recommended.

Port status

This list shows the status for the connected inputs and outputs of the Axis video server. This is for the benefit of an operator, who cannot access the System Options section. Example: If the Normal state for a push button connected to an input is set to Open circuit, the state is inactive
as long as the button is not pushed. If the button is pushed, the state of the input changes to active.

HTTPS For greater security, AXIS 241Q/241S can be configured to use HTTPS (Hypertext Transfer Protocol over SSL (Secure Socket Layer)). That is, all communication that would otherwise go via HTTP will instead go via an encrypted HTTPS connection. A self-signed certificate can be used until a Certificate Authority-issued certificate has been obtained. Click the Create self-signed Certificate button to install a self-signed certificate. Although self-signed certificates are free and offer some protection, true security is only implemented after the installation of a signed certificate issued by a certificate authority. A signed certificate can be obtained from an issuing Certificate Authority by clicking the Create Certificate Request button. When the signed certificate is returned, click the Install signed certificate button to import the certificate. The properties of any certificate request currently resident in the camera or installed can also be viewed by clicking the Properties. button. The HTTPS Connection Policy must also be set in the drop-down lists to enable HTTPS in the camera. For more information, please see the online help. IEEE 802.1x - Network Admission Control IEEE 802.1x is an IEEE standard for port-based Network Admission Control. It provides authentication to devices attached to a network port (wired or wireless), establishing a point-to-point connection, or, if authentication fails, preventing access on that port. 802.1x is based on EAP (Extensible Authentication Protocol). In a 802.1x enabled network switch, clients equipped with the correct software can be authenticated and allowed or denied network access at the Ethernet level. Clients and servers in an 802.1x network may need to authenticate each other by some means. In the Axis implementation this is done with the help of digital certificates provided by a Certification Authority. These are then validated by a third-party entity, such as a RADIUS server, examples of which are Free Radius and Microsoft Internet Authentication Service. To perform the authentication, the RADIUS server uses various EAP methods/protocols, of which there are many. The one used in the Axis implementation is EAP-TLS (EAP-Transport Layer Security).
40 AXIS 241Q/241S - System options
The AXIS network video device presents its certificate to the network switch, which in turn forwards this to the RADIUS server. The RADIUS server validates or rejects the certificate and responds to the switch, and sends its own certificate to the client for validation. The switch then allows or denies network access accordingly, on a preconfigured port. The authentication process Axis video device
Q: Certificate OK? A: OK Network switch

The video server includes support for UPnP. UPnP is enabled by default, and the video server then is automatically detected by operating systems and clients that support this protocol. Note: UPnP must be installed on your workstation if running Windows XP. To do this, open the Control Panel
from the Start Menu and select Add/Remove Programs. Select Add/Remove Windows Components and open the Networking Services section. Click Details and then select UPnP as the service to add.

RTP (Multicast)/MPEG-4

These settings are the IP address, port number, and Time-To-Live value to use for the media stream(s) in multicast MPEG-4 format. Only certain IP addresses and port numbers should be used for multicast streams. For more information, please see the online help.

Bonjour

Your Axis network camera includes support for Bonjour. When enabled, the camera is automatically detected by operating systems and clients that support this protocol.

Ports & devices

I/O Ports - the pinout, interface support and the control and monitoring functions provided by this connector are described in Unit connectors, on page 49. RS232 - The COM port RS-232 on the AXIS 241Q/241S supports several operational modes listed on this page. For more information, please see COM ports RS-232 and RS-485, on page 51.
46 AXIS 241Q/241S - System options
RS485 - The COM ports on the AXIS 241Q/241S supports several operational modes listed on this page. For more information, please see COM ports RS-232 and RS-485, on page 51.

Maintenance

Restart - The unit is restarted without changing any of the settings. Use this method if the unit is not behaving as expected. Restore - The unit is restarted and most current settings are reset to factory default values. The settings that are not affected are: the boot protocol (DHCP or static) the static IP address the default router the subnet mask the system time Default - The default button should be used with caution. Pressing this will return all of the video server's settings to the factory default values (including the IP address) Upgrade Server - See Upgrading the firmware, on page 53. Backup - To take a backup of all of the parameters, and any user-defined scripts, click this button. If necessary, it is then possible to return to a previous configuration if settings are changed and there is unexpected behavior. Restore - click the Browse button to locate the saved backup file (see above) and then click the Restore button. The settings will be restored to the previous configuration. Note: Backup and Restore can only be used on the same unit running the same firmware. This feature is not

1. Save the firmware file to your computer. The latest version of the Axis video server firmware is available free of charge from the Axis Web site at www.axis.com/techsup or from your local distributor. 2. Go to Setup > System Options > Maintenance in the video servers Web pages. 3. In the Upgrade Server section, click Browse to locate the desired firmware file on your computer. Click Upgrade.
Notes: Always read the upgrade instructions available with each new release, before updating the firmware.
After starting the process, you should always wait at least 20 minutes before restarting the Axis video server, even if you suspect the procedure has failed. Your dealer reserves the right to charge for any repair attributable to faulty updating by the user.
54 AXIS 241Q/241S - Troubleshooting
Emergency recovery procedure
If power or the network connection to the Axis video server is lost during the upgrade, the process will fail and the unit will become unresponsive. A flashing red Status LED indicates a failed upgrade. To recover the unit, follow the steps below. The serial number is found on the underside label on the product casing. 1. UNIX/Linux - From the command line, type the following: arp -s <IP address of Axis video server> <Serial number> temp ping -s 408 <IP address of Axis video server> Windows - From a command/DOS prompt, type the following: arp -s <IP address of Axis video server> <Serial number> ping -l 408 -t <IP address of Axis video server> 2. If the unit does not reply within a few seconds, restart it and wait for a reply. Press CTRL+C to stop Ping. 3. Open a web browser and type in the Axis video servers IP address. In the page that appears, use the Browse button to select the file (for example, axis241q.bin). Then click the Load button to restart the upgrade process. 4. After the upgrade is complete (1-10 minutes), the unit will automatically restart and show a steady green on the Power and Status LEDs and flashing green or amber on the Network LED. 5. Reinstall the Axis video server. If the emergency recovery procedure does not get the Axis video server up and running again, please contact Axis support at www.axis.com/techsup/
If you contact Axis support, please help us resolve your problems expediently by providing a server report, log file and a brief description of the problem. Server Report - go to Setup > System Options > Support Overview. The server report contains important information about the server and its software, as well as a list of the current parameters. Log file - go to Setup > System Options > Logs & Reports. The Log file records events within the unit since the last restart of the system and can prove a useful diagnostic tool for troubleshooting.

Important!

The figures displayed here are the values as delivered by the server. If other restrictions are currently in force, (e.g. bandwidth limitation) these values might not correspond to those actually received by the client. For Motion JPEG, these values will only be accurate as long as no frame rate limit has been specified.
62 AXIS 241Q/241S - Technical specifications
Frame rates - Motion JPEG
The following test results show the frame rates in frames/second (fps) for Motion JPEG streams from the AXIS 241Q/241S, using a compression level of 50%. Note that these values are guidelines only - actual values may vary.
AXIS 241Q/241S fps (NTSC/PAL) 1 channel 4CIF 2CIF expanded 2CIF CIF QCIF 30/25 30/25 30/25 30/25 30/25 fps (NTSC/PAL) 4 channels 10/8 15/13 27/22 30/25 30/25

Frame rates - MPEG-4

The following test results show the frame rates in frames/second (fps) for MPEG-4 streams from the AXIS 241Q/241S. Note that these values are guidelines only - actual values may vary. The MPEG-4 test conditions: Compression level = 50% Video Object Type = Advanced Simple GOV structure = IP*
AXIS 241Q/241S fps (NTSC/PAL) 1 channel 4CIF 2CIF expanded 2CIF CIF QCIF 21/17 21/17 30/25 30/25 30/25 fps (NTSC/PAL) 4 channels 4/3 5/4 10/9 20/17 30/25
Note that setting the GOV structure to use I-frames only will increase the frame rate. * The GOV structure can take two different forms; I and IP. The I-structure sends complete images (I-images) whereas the IP-structure mostly sends the differences compared with the previous image (P-images) and only a few I-images. The IP-structure requires much less bandwidth than the I-structure.

Bandwidth

As there are many factors affecting bandwidth, it is very difficult to predict the required amounts. The settings that affect bandwidth are: the image resolution the image compression the frame rate the MPEG-4 object type the MPEG-4 GOV structure the analog cameras connected to the video server There are also factors in the monitored scene that will affect the bandwidth. These are: the amount of motion the images complexity the lighting conditions For MPEG-4, if there is only limited bandwidth available, and if this is more important than the image quality, using a constant bit rate (CBR) is recommended. Use a variable bit rate (VBR) if the image quality needs to be maintained at a higher level. With multiple viewers, and if supported on the network, consider also using MPEG-4 multicasting, as the bandwidth consumption will be much lower.

AXIS 241Q/241S - Glossary
CCTV video camera - A traditional CCTV video camera is an analog camera, available in both monochrome (black and white) and color. Cameras can be set in fixed positions or placed on "Pan/Tilt/Zoom" devices, which allow the camera to be maneuvered. Using a zoom lens provides a closer view of the object being viewed. CCTV analog video cameras can be viewed over a computer network by using a video server. CGI (Common Gateway Interface) - A specification for communication between a web server and other (CGI) programs. For example, a HTML page that contains a form might use a CGI program to process the form data once it is submitted. CIF (Common Intermediate Format) - CIF refers to the analog video resolutions 352x288 pixels (PAL) and 352x240 pixels (NTSC). See also Resolution. Client-server - Client-server describes the relationship between two computer programs in which one program, the client, makes a service request from another program, the server, which fulfils the request. Typically, multiple client programs share the services of a common server program. A web browser is a client program that requests services (the sending of web pages or files) from a web server. CMOS (Complementary Metal Oxide Semiconductor) - A CMOS is a widely used type of semiconductor that uses both negative and positive circuits. Since only one of the circuit types is on at any given time, CMOS chips require less power than chips using just one type of transistor. CMOS image sensors also allow processing circuits to be included on the same chip, an advantage not possible with CCD sensors, which are also much more expensive to produce. Coaxial cable - Coaxial cable is the standard means of transmitting analog video in a CCTV system. Coaxial is also used by cable companies to distribute television in residential buildings. Codec - In communications engineering, a codec is usually a coder/decoder. Codecs are used in integrated circuits or chips that convert e.g. analog video signals into a digital format for transmission. The codec also converts received digital signals back into analog format. A codec uses analog-to-digital conversion and digital-to-analog conversion in the same chip. Codec can also mean compression/decompression, in which case it is generally taken to mean an algorithm or computer program for reducing the size of large files and programs. Composite video - A type of video signal in which the red, blue and green signals are mixed together. Compression - See Image Compression. Control unit - If a CCTV system has more than one camera, there must be a way to control the video signals going to recorders and monitors. There are three basic types of Video Control Unit: Multiplexer, Switch and Quad. DC-Iris - This special type of iris is electrically controlled by the camera, to automatically regulate the amount of light allowed to enter. Decoder - See Video decoder. De-interlacing - See Interlacing. DHCP (Dynamic Host Configuration Protocol) - DHCP is a protocol that lets network administrators automate and centrally manage the assignment of Internet Protocol (IP) addresses to network devices in a network. DHCP uses the concept of a "lease" or amount of time that a given IP address will be valid for a computer. The lease time can vary, depending on how long a user is likely to require the network connection at a particular location. DHCP also supports static addresses for e.g. computers running web servers, which need a permanent IP address. DIP switch - A DIP switch is an electric switch that is packaged in a group in a standard dual in-line package (DIP). DNS (Domain Name System) - DNS is used to locate and translate Internet domain names into IP (Internet Protocol) addresses. A domain name is a meaningful and easy-to-remember name for an Internet address. For example the domain name www.example.com is much easier to remember than 192.0.34.166. The translation tables for domain names are contained in Domain name servers. Domain server - Domains can also be used by organizations that wish to centralize the management of their (Windows) computers. Each user within a domain has an account that usually allows them to log in to and use any computer in the domain, although restrictions may also apply. The domain server is the server that authenticates the users on the network. Duplex - See Full-duplex. DVR (Digital Video Recorder) - A DVR records analog video to a hard disk in digital format. Most DVRs use the MPEG-2 format for encoding analog video signals. Encoder - See Video encoder.

66 AXIS 241Q/241S - Glossary
Ethernet - Ethernet is the most widely installed local area network technology. An Ethernet LAN typically uses special grades of twisted pair wires. The most commonly installed Ethernet systems are 10BASE-T and 100BASE-T10, which provide transmission speeds up to 10 Mbps and 100 Mbps respectively. ETRAX (Ethernet Token Ring AXIS) - The ETRAX chip is the cornerstone of Axis technology and the 'brain' in nearly all Axis products. A multipurpose Linux chip with integrated Ethernet networking and extremely flexible I/O options. Factory default settings - These are the settings that originally applied for a device when it was first delivered from the factory. If it should become necessary to reset a device to its factory default settings, this will, for many devices, completely reset any settings that were changed by the user. Firewall - A firewall works as a barrier between networks, e.g. between a Local Area Network and the Internet. The firewall ensures that only authorized users are allowed to access the one network from the other. A firewall can be software running on a computer, or it can be a standalone hardware device. Fixed iris - See Autoiris. FTP (File Transfer Protocol) - FTP is an application protocol that uses the TCP/IP protocols, used to exchange files between computers/devices on networks. Frame - A frame is a complete video image. In the 2:1 interlaced scanning format of the RS-170 and CCIR formats, a frame is made up of two separate fields of 262.5 or 312.5 lines interlaced at 60 or 50 Hz to form a complete frame, which appears at 30 or 25 Hz. In video cameras with a progressive scan, each frame is scanned line-by-line and not interlaced; most are also displayed at 30 and 25 Hz. Frame rate - The frame rate used to describe the frequency at which a video stream is updated is measured in frames per second (fps). A higher frame rate is advantageous when there is movement in the video stream, as it maintains image quality throughout. Gain - Gain is the amplification factor and the extent to which an analog amplifier boosts the strength of a signal. Amplification factors are usually expressed in terms of power. The decibel (dB) is the most common way of quantifying the gain of an amplifier. Gateway - A gateway is a point in a network that acts as an entry point to another network. In a corporate network for example, a computer server acting as a gateway often also acts as a proxy server and a firewall server. A gateway is often associated with both a router, which knows where to direct a given packet of data that arrives at the gateway, and a switch, which furnishes the actual path in and out of the gateway for a given packet. GIF (Graphics Interchange Format) - GIF is one of the most common file formats used for images in web pages. There are two versions of the format, 87a and 89a. Version 89a supports animations, i.e. a short sequence of images within a single GIF file. A GIF89a can also be specified for interlaced presentation. GOV (Group Of VOPs) - A group of VOPs is the basic unit of an MPEG-4 video stream. The GOV contains different types and numbers of VOPs (I-VOPs, P-VOPs) as determined by the GOV length and GOV structure. See also VOP. GOV length - The GOV length determines the number of images (VOPs) in the GOV structure. See also GOV and VOP. GOV structure - The GOV structure describes the composition of an MPEG-4 video stream, as regards the type of images (I-VOPs or P-VOPs) included in the stream, and their internal order. See also GOV and VOP. HTML (Hypertext Markup Language) - HTML is the set of "markup" symbols or codes inserted in a file intended for display in web browser. The markup tells the browser how to display the page's words and images for the user. HTTP (Hypertext Transfer Protocol) - HTTP is the set of rules for exchanging files (text, graphic images, sound, video, and other multimedia files) on the web. The HTTP protocol runs on top of the TCP/IP suite of protocols. HTTPS (Hypertext Transfer Protocol over SSL) - HTTPS is a protocol used by web browsers and servers to encrypt and decrypt user page requests and the pages returned by the server. The encrypted exchange of information is governed by the use of an HTTPS certificate (issued by a Certificate Authority), which guarantees the authenticity of the server. Hub - A (network) hub is used to connect multiple devices to the network. The hub transmits all data to all devices connected to it, whereas a switch will only transmit the data to the device it is specifically intended for. IEEE 802.11 - A family of standards for wireless LANs. The 802.11a standard supports 1 or 2 Mbit/s transmission on the 5 GHz band. IEEE 802.11b supports data rates up to11 Mbit/s on the 2.4 GHz band, while 802.11g allows up to 54 Mbit/s on the 2.4 GHz band.

WAN (Wide Area Network) as a large single LAN (Local Area Network). This kind of interconnection is known as a virtual private network (VPN). Pre/post alarm images - The images from immediately before and after an alarm. These images are stored in a buffer for later retrieval. Progressive scan - Progressive scan, as opposed to interlaced video, scans the entire picture, line by line every sixteenth of a second. In other words, captured images are not split into separate fields as in interlaced scanning. Computer monitors do not need interlace to show the picture on the screen, but instead show them progressively, on one line at a time in perfect order i.e. 1, 2, 3, 4, 5, 6, 7 etc., so there is virtually no "flickering" effect. In a surveillance application, this can be critical when viewing detail within a moving image, such as a person running. A high-quality monitor is required to get the best from progressive scan. See also Interlacing. Protocol - A special set of rules governing how two entities will communicate. Protocols are found at many levels of communication, and there are hardware protocols and software protocols. Proxy server - In an enterprise that uses the Internet, a proxy server acts as an intermediary between a workstation user and the Internet. This provides security, administrative control, and a caching service. Any proxy server associated with a gateway server, or part of a gateway server, effectively separates the enterprise network from the outside network and the local firewall. It is the firewall server that protects the enterprise network from outside intrusion. PTZ (Pan Tilt Zoom) - A PTZ-enabled camera can be remotely controlled so as to change the view from the camera. Panning is the movement of the camera along its horizontal axis, tilting is the movement of the camera along its vertical axis, and zooming is the adjustment of the zoom lens to magnify the view. P-VOP - See VOP. Resolution - Image resolution is a measure of how much detail a digital image can hold: the greater the resolution, the greater the level of detail. Resolution can be specified as the number of pixel-columns (width) by the number of pixel-rows (height), e.g. 320x240. Alternatively, the total number of pixels (usually in megapixels) in the image can be used. In analog systems it is also common to use other format designations, such as CIF, QCIF, 4CIF, etc. RS-232 - A long-established standard that describes the physical interface and protocol for low-speed serial data communication between devices. This is the interface that e.g. a computer uses to talk to and exchange data with a modem and other serial devices. RS-485 - An upgraded version of RS-422 that supports up to 32 devices on the same connection. RS-485 is an electrical specification of a two-wire, half-duplex, multipoint serial connection. It enables the configuration of inexpensive local networks and multidrop communications links. It offers high data transmission speeds (up to 10Mbit/s), and as it uses a differential balanced line over twisted pair (like RS-422), it can span relatively large distances (4000 feet or 1200 meters). RS-485 only specifies the electrical characteristics of the driver and the receiver. It does not specify or recommend any data protocol. RTCP (Real-Time Control Protocol) - RTCP provides support for real-time conferencing of groups of any size within an intranet. This support includes source identification and support for gateways like video bridges as well as multicast-to-unicast translators. It offers quality-of-service feedback from receivers to the multicast group as well as support for the synchronization of different media streams. RTP (Real-Time Transport Protocol) - An Internet protocol for the transport of real-time data, such as video. It can be used for media-on-demand as well as interactive services such as Internet telephony. RTSP (Real Time Streaming Protocol) - A control protocol, and a starting point for negotiating transports such as RTP, multicast and Unicast, and for negotiating codecs. RTSP can be considered a "remote control" for controlling the media stream delivered by a media server. RTSP servers typically use RTP as the protocol for the actual transport of video data. Router - A device that determines the next network point to which a packet should be forwarded on its way to its final destination. A router creates and/or maintains a special routing table that stores information on how best to reach certain destinations. A router is sometimes included as part of a network switch. See also Switch. Security surveillance - Network video's advanced functionality makes it highly suited to the applications involved in security surveillance. The flexibility of digital technology enhances security personnel's ability to protect people, property and assets. Such systems are therefore an especially attractive option for companies currently using CCTV. Server - In general, a server is a computer program that provides services to other computer programs in the same or other

Backup 46 Bandwidth 13, 63 Basic TCP/IP settings 41 Buffers 29
CGI links 25, 36 Click-in-image 36 COM Port RS-Constant bit rate 13 Control button 8, 48 Customize 24
Date & Time 41 DC power 50 Default video format 25 Default Viewer 25 Digital input 50 DIP switch 8 DNS configuration 42
Email server 44 Emergency recovery 54
AXIS 243SA - Index Enable ARP/Ping 42 Event configuration 27 Event servers 27 Event types 27 External video 26
Factory default settings 48 Frame rates 19, 20, 62 FTP server 27
Generic HTTP 51 Generic TCP/IP 51
Host name 42 HTML examples 26 HTTP API 36 HTTP API requests 25 HTTP port number 43 HTTP server 27 HTTPS 39
I/O Ports 45 I/O terminal connector 9 Include windows 30 Installing PTZ devices 33 IP address filtering 38
Live View Config 23 Live View page 17 Logs & Reports 46
Maximum bandwidth 43 Motion detection 30 Motion JPEG 13 MPEG-MPEG-4 clients 16 MPEG-4 protocols 14

74 AXIS 243SA - Index

MPEG-4 settings 45 Multicasting 14
Network settings 41 Network traffic 43
Operators 38 Output buttons 11, 26 Overlays 18 Own home page 24 Own web files 24
Pan/Tilt/Zoom 34, 51 Pinout - I/O connectors 50 Port status 32 Ports & Devices 45 Post-trigger buffer 29 Pre-trigger buffer 29 PTZ commands 25, 36 PTZ control queue 37 Pulse 11, 26

QoS 44 Quad stream 20

Recovery 54 Referrals 38 Relative and absolute PTZ drivers 35 Restart 46 Restore 46 RS-232 connector 9 RS-RTP 14, 45 RTSP 14, 43
Scheduled event 27 Security 38
AXIS 243SA - Index Sequence mode 11 Services 41 SMTP settings 44 Snapshot 11 SOCKS server 43 Specifications 58 Streaming MPEG-Support 46 S-Video 52 System options 38
TCP server 27 TCP/IP settings 41 Transistor output 50 Trigger buttons 11 Triggered event 27 Troubleshooting 53
UDP 14 Upgrade Server 46 UPnP 45 User Defined Links 25 Users 38
Variable bit rate 13 Video Input 8 Video Output 8 Video source 19 Video streams 13, 15, 19 Viewer settings 25

Y/C to BNC cable 52