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Axis Video Server 241SA User Manual

Axis communications video server user's manual
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AXIS 241QA/AXIS 241SA Video Server
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Summary of Contents for Axis Video Server AXIS 241SA

  • Page 1 AXIS 241QA/AXIS 241SA Video Server User’s Manual...
  • Page 2 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.

  • Page 3: Table Of Contents

    Table of contents Product description............. . . 5 Overview of the AXIS video server .
  • Page 4 Axis video server Event configuration ............. 39 Event servers .

  • Page 5: Product Description

    The built-in scripting tool allows basic applications to be created, providing basic surveillance solutions. For advanced functionality, the video server can be integrated via the use of VAPIX® Axis Communications’ powerful API (see www.axis.com/developer for further information).

  • Page 6: Axis 241Qa

    AXIS 241QA/AXIS 241SA - Product description AXIS 241QA The AXIS 241QA provides 4 BNC inputs for connecting analog video devices. The AXIS 241QA also provides a Line/Microphone In (mono) connector for connecting an external microphone or other source, producing a line level signal. An active speaker with a built-in amplifier can be connected to Line Out (mono), to enable two-way communication.

  • Page 7: Switches & Connectors

    Power Green Amber Switches & connectors DIP switch - A corresponding line termination switch is supplied for each video input. All units are shipped with line termination enabled for each video input; that is, with the DIP switch set in the down position. Note: If the video source is to be connected in parallel with other equipment, disable the input termination by turning the corresponding DIP switch to the up position (OFF).
  • Page 8 AXIS 241QA/AXIS 241SA - Product description Note: The I/O terminal connector also provides an auxiliary connection point for DC power. Network connector - The Axis video server connects to the network via a standard network cable, and automatically detects the speed of the local network segment (10BaseT/100BaseTX Ethernet).

  • Page 9: Using The Video Server

    Using the video server The AXIS 241QA/AXIS 241SA can be used with most operating systems and web browsers. The recommended browser is Internet Explorer with Windows, and Mozilla with other operating systems. See also the Technical specifications, on page 66. Note: For information on installing the video server, please refer to the Installation Guide.

  • Page 10: Setting The Root Password

    AXIS 241QA/AXIS 241SA - Using the video server Notes: • To view streaming video in Microsoft Internet Explorer, you must set your web browser to allow the AXIS Media Control (AMC) to be installed on your computer. AMC is required to use audio in the AXIS 241QA/AXIS 241SA.

  • Page 11: The Live View Page

    5. If required, click Yes to install the AXIS Media Control (AMC). You will need administrator rights on the computer to do this. The Live View Page If your AXIS 241QA/AXIS 241SA has been customized to meet specific requirements, all the buttons and other items described below may not be displayed on the Live View page.
  • Page 12 AXIS 241QA/AXIS 241SA - Using the video server The Snapshot button saves a snapshot of the video image currently displayed. The Snapshot function and the target directory for saving snapshots can be configured from the AMC Control Applet, which can be opened from the Windows Control Panel or by right-clicking the image.

  • Page 13: Video And Audio Streams

    Video and audio streams The AXIS 241QA/AXIS 241SA provides several different video and audio stream formats. The type to use depends on your requirements and on the properties of your network. The Live View page in the AXIS 241QA/AXIS 241SA provides access to Motion JPEG and MPEG-4 video and audio streams, as well as to single JPEG images.

  • Page 14: Mpeg-4 Protocols And Communication Methods

    AXIS 241QA/AXIS 241SA - Video and audio streams MPEG-4 protocols and communication methods To deliver live streaming video over IP networks, various combinations of transport protocols and broadcast methods are employed. • RTP (Real-Time Transport Protocol) is a protocol that allows programs to manage the real-time transmission of multimedia data, via unicast or multicast.

  • Page 15: Other Methods Of Accessing The Video Stream

    RTP+RTSP This method (actually RTP over UDP and RTSP over TCP) should be your first consideration for live video, especially when it is important to always have an up-to-date video stream, even if some images do get dropped. This can be configured as multicast or unicast. Multicasting provides the most efficient usage of bandwidth, especially when there are large numbers of clients viewing simultaneously.

  • Page 16: Other Mpeg-4 Clients

    AXIS 241QA/AXIS 241SA - Video and audio streams Other MPEG-4 clients Although it may be possible to use other clients to view the MPEG-4 stream, it is not guaranteed to work in all cases. For some other clients, such as QuickTime™ the Video Object Type must be set to Simple.

  • Page 17: Configuring The Video Server

    Configuring the video server This section describes how to configure the AXIS 241QA/AXIS 241SA and is intended for administrators, who have unrestricted access to all the Setup tools The AXIS 241QA/AXIS 241SA is configured from the Setup link in a web browser. For more information on supported browsers, see the Technical specifications, on page 66.

  • Page 18: Video & Image Settings

    AXIS 241QA/AXIS 241SA - Video & image settings Video & image settings Below you find examples of the features available in the AXIS 241QA/AXIS 241SA. For details of each setting, please refer to the online help available from each page. Click access the online help.

  • Page 19: Video Source Settings

    Mirroring Mirroring is the horizontal flipping of an image, that gives you another image perspective. This is a useful function when you need a direct view of the image, for example, in ATMs and door phones. The mirroring settings should be defined before you define the parameters for privacy masks and motion detection.

  • Page 20: Quad Stream Settings

    AXIS 241QA/AXIS 241SA - Video & image settings The MPEG-4 standard provides many different coding tools for various applications in different situations. As most MPEG-4 clients do not support all of these tools, it is usual to instead define and use subsets for different clients or groups of clients. These settings allow you to define the type of viewing client to use.
  • Page 21 Upload and use an overlay image 1. Select Uploaded image as overlay in the drop-down list against Overlay/Mask Type. 2. In the field Upload own image, click the Browse button and locate the image file on your computer or server. 3.
  • Page 22 AXIS 241QA/AXIS 241SA - Video & image settings Use a Privacy Mask To use privacy masks to hide different areas of the video image: 1. Select Configurable areas as privacy mask in the Overlay/Mask Type drop-down list. 2. Enter the (x,y) coordinates of the top left hand corner of the mask, and the height and width to define the masks’...

  • Page 23: Audio

    Audio The AXIS 241QA/AXIS 241SA can transmit audio to other clients using an external microphone and can play audio received from other clients by attaching a speaker. The Audio Settings allow different audio configurations to be set up, such as full duplex, half duplex, and simplex.
  • Page 24 AXIS 241QA/AXIS 241SA - Audio Full-duplex mode means that you can transmit and receive audio (talk and listen) at the same time, without having to use any of the controls. This is just like having a telephone conversation. The only controls you may wish to use are the mute buttons to turn off the sound, and the sliders, to adjust the input/output volume levels.
  • Page 25 If t the sound input is too low or high, it is possible to adjust the input gain for the microphone attached to the AXIS 241QA/AXIS 241SA. Select the desired audio Encoding format, G711, G726. Depending on the selected encoding, set the desired Bit rate (audio quality). The settings depend on the available bandwidth and the required audio quality, that is, a high bit rate setting requires more bandwidth.
  • Page 26 AXIS 241QA/AXIS 241SA - Audio When the incoming sound is louder than the threshold, it will pass without any change. When lower than the threshold, the incoming sound is reduced by a certain attenuation factor. The threshold value should be set higher than the background noise, but lower than the useful audio.

  • Page 27: Live View Config

    Live View Config Layout These are the tools for deciding the layout of the Live View page. The layout can be set in two ways: • Use Axis look - the layout is unchanged. • Use custom settings - modify the default page with your own col- ors, and images.
  • Page 28 AXIS 241QA/AXIS 241SA - Live View Config Customizing the default page The appearance of the default AXIS 241QA/AXIS 241SA Live View page can be customized to suit your own requirements, or you can upload and use your own home page. To upload your own files, click the Upload/Remove button and see the description below.
  • Page 29 AXIS 241QA/AXIS 241SA - Live View Config Modify the Axis Look Select the background and text colors from the drop-down lists. To add a background picture, a banner and/or a logo, select your uploaded file or specify the location of an external file as described above.

  • Page 30: Html Examples

    AXIS 241QA/AXIS 241SA - Live View Config User-defined Links Enter a descriptive name and the URL in the field provided. The link appears on the Live View page. User defined CGI links can be used to issue HTTP API requests, such as PTZ commands. Example: 1.

  • Page 31: External Video

    AXIS 241QA/AXIS 241SA - Live View Config External Video You can add links to other Axis network devices available over the network. These sources can be displayed on the Live View page, just as if they were video sources connected directly to the AXIS 241QA/AXIS 241SA.

  • Page 32: Pan Tilt Zoom

    AXIS 241QA/AXIS 241SA - Pan Tilt Zoom Pan Tilt Zoom Installing PTZ devices The AXIS 241QA/AXIS 241SA supports several PTZ devices. Please see www.axis.com for a complete list of supported devices, and to obtain the correct driver. Follow the instructions below to install a PTZ device: 1.

  • Page 33: Ptz Configuration

    AXIS 241QA/AXIS 241SA - Pan Tilt Zoom PTZ configuration Once PTZ has been installed for the AXIS 241QA/AXIS 241SA, PTZ Configuration now appears in the menu to the left with the following sub menus. Preset positions A preset position is a pre-defined camera view than can be used to quickly move the camera to a specific location.

  • Page 34: Ptz Controls

    AXIS 241QA/AXIS 241SA - Pan Tilt Zoom PTZ controls If the AXIS 241QA/AXIS 241SA has been appropriately configured, the Live View page will display the controls available for the installed PTZ device. The administrator can enable/disable the controls for specified users. The exact controls shown depend on the make and model of PTZ device.
  • Page 35 AXIS 241QA/AXIS 241SA - Pan Tilt Zoom In contrast, when using an absolute driver, each position on the bar (see right) represents a defined position in the device’s range of movement, with the center of the bar representing the point midway between the two extremes of movement. Clicking a position directly on the bar moves the camera directly to the new position in one smooth movement.
  • Page 36 AXIS 241QA/AXIS 241SA - Pan Tilt Zoom Preset positions Also available with many PTZ devices are Preset positions. These presets are selected from the drop-down Source list on the Live View page and will move and/or zoom the camera to a pre-defined position, that is to cover an area of particular interest. Events can also be configured to go to preset positions when triggered.

  • Page 37: Ptz Control Queue

    AXIS 241QA/AXIS 241SA - Pan Tilt Zoom OSD Menu - If the PTZ unit supports an internal configuration menu, this can be accessed using the On-Screen Display (OSD). Configure the analog camera by opening and navigating through its internal menu in this display. PTZ control queue Use the PTZ control queue window to enable and disable PTZ queueing.
  • Page 38 AXIS 241QA/AXIS 241SA - Pan Tilt Zoom The order of priority for taking control of the queue is as follows: 1. Administrators - an administrator takes over PTZ control regardless of who is first in queue. The administrator is removed from the queue 60 seconds after their last PTZ control command.

  • Page 39: Event Configuration

    Event configuration This section describes how to configure the AXIS 241QA/AXIS 241SA for alarm handling. Various actions can be configured to run when certain types of events occur. Event type A set of parameters describing how and when the video server is to perform certain actions the circumstances that start an event Triggered Event (see page 40) Scheduled Event (see page 41) the circumstances that start an event...

  • Page 40: Event Types

    AXIS 241QA/AXIS 241SA - Event configuration Event types An event type is a set of parameters describing how and when the video server is to perform certain actions. Example: If somebody walks past the connected camera, and an event has been configured to act on this, the video server can record and send video images to an FTP server, or send a notification email to a...
  • Page 41 Pre-trigger and post-trigger buffers This function is useful when checking to see what happened immediately before and after a trigger, e.g. two minutes before and after a door was opened. Check the Upload images option under Event Types > Add Triggered... > When triggered... to see available options. Include pre-trigger buffer - images stored internally in the server from the time immediately preceding the trigger.

  • Page 42: Camera Tampering

    AXIS 241QA/AXIS 241SA - Event configuration Camera tampering The camera tampering application generates an alarm whenever the camera is repositioned, or when the lens is covered, sprayed, or severely defocused. You must also create an event, (see How to set up a triggered event, on page 40) for the camera to send an alarm.

  • Page 43: Motion Detection

    Motion detection In the Motion Detection menu, you can configure the video source(s) for motion detection. The motion detection feature is used to generate an alarm whenever movement occurs (or stops) in the image. The AXIS 241QA/AXIS 241SA can use a maximum of 10 Include/Exclude windows.

  • Page 44: Click Save

    AXIS 241QA/AXIS 241SA - Event configuration 7. 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). 8. Click Save. If there are parts of the Include window that you wish to exclude, click the Configure Excluded Windows radio button and perform steps 1-6 above.

  • Page 45: System Options

    System options Security User access control is enabled by default, when the administrator sets the root password on first access. New users are authorized with user names and passwords, or the administrator can choose to allow anonymous viewer login to the Live View page, as described below: Users The user list displays the authorized users and access levels: Viewer...
  • Page 46 AXIS 241QA/AXIS 241SA - System options Note that users from IP addresses that will be allowed must also be registered with the appropriate access rights (User, Operator or Administrator). This is done from Setup > System Options > Security > Users. Referrals - to prevent unauthorized sources from including the video stream from the AXIS 241QA/AXIS 241SA into external Web pages, check the Referrals box and enter the IP address or Host name of the computer that hosts the Web pages with the included video...
  • Page 47 AXIS 241QA/AXIS 241SA - System options Please refer to the home page of your preferred CA for information on where to send the request. For more information, please see the online help...

  • Page 48: Date & Time

    AXIS 241QA/AXIS 241SA - System options IEEE 802.1X 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).

  • Page 49: Network - Basic Tcp/Ip Settings

    From the Time Mode section, select the preferred method to use for setting the time: • Synchronize with computer time - sets the time from the clock on your com- puter. • Synchronize with NTP server - the video server obtains the time from an NTP server every 60 minutes.

  • Page 50: Network - Advanced Tcp/Ip Settings

    AXIS 241QA/AXIS 241SA - System options Notes: • The ARP/Ping service is automatically disabled two minutes after the unit is started, or as soon as an IP address is set. • Pinging the unit will still be possible when this service is disabled. AXIS Internet Dynamic DNS Service - If the AXIS 241QA/AXIS 241SA has been registered with the Axis Internet Dynamic DNS service and the IP address for the product changes, the service is updated to reflect the change.
  • Page 51 Link-Local address IPv4 Address This is enabled by default and assigns the AXIS 241QA/AXIS 241SA an additional IP address for use with UPnP™. The AXIS 241QA/AXIS 241SA can have both a Link-Local IP and a static or DHCP-supplied IP address at the same time - these will not affect each other.
  • Page 52 AXIS 241QA/AXIS 241SA - System options SOCKS SOCKS is a networking proxy protocol. The AXIS 241QA/AXIS 241SA can be configured to use a SOCKS server to reach networks on the other side of a firewall/proxy server. This function is useful if the video server is located on a local network behind a firewall, but notifications, uploads, and alarms need to be sent to a destination outside the local network (such as the Internet).
  • Page 53 If the mail server requires SMTP authentication, check the box for Use authentication to log in to this server and enter the user name and password used for logging in. Several different methods of authentication are available. See the online help for more information.

  • Page 54: Ports & Devices

    AXIS 241QA/AXIS 241SA - System options 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 57. RS232 - The COM port RS-232 on the AXIS 241QA/AXIS 241SA supports several operational modes listed on this page.

  • Page 55: Advanced

    Information - The Log report and the Parameter List also provide valuable information for troubleshooting and when contacting Axis support service. Configuration: Log Level for Log Files - from the drop-down list, select the level of information to be added to the Log file Log Level for Email - from the drop-down list, select the level of information to send as email and enter the destination email address.

  • Page 56: Resetting To The Factory Default Settings

    AXIS 241QA/AXIS 241SA - System options Resetting to the factory default settings To reset the AXIS 241QA/AXIS 241SA to the original default settings, go to the System Options > Maintenance web page (described in Maintenance, on page 54) or use the control button on the AXIS 241QA/AXIS 241SA, as described below: Using the Control Button Follow the instructions below to reset the AXIS 241QA/AXIS 241SA to the factory default...

  • Page 57: Unit Connectors

    Unit connectors The following connectors are described in this section: • The D-Sub connector, on page 57 • The I/O terminal connector, on page 58 • COM ports RS-232 and RS-485, on page 59 The D-Sub connector The AXIS 241QA/AXIS 241SA provides one 9-pin D-Sub connector, providing the physical interface for an RS-232 port, used for connecting accessory equipment;...

  • Page 58: The I/O Terminal Connector

    AXIS 241QA/AXIS 241SA - Unit connectors The I/O terminal connector This section describes the pinout and interface support provided by the 12-pin I/O terminal connector, which includes: • 4 digital transistor outputs • 4 digital inputs • an RS-485 interface •...

  • Page 59: Schematic Diagram - I/O Terminal Connector

    Schematic diagram - I/O terminal connector 3.3V RS-485 COM ports RS-232 and RS-485 The COM Ports RS-232 and RS-485 support several operational modes: • Generic TCP/IP - enables the video server to receive status/data and send com- mands via TCP/IP •...
  • Page 60 AXIS 241QA/AXIS 241SA - Unit connectors...

  • Page 61: Troubleshooting

    Troubleshooting Checking the firmware Firmware is software that determines the functionality of the AXIS 241QA/AXIS 241SA. One of your first actions when troubleshooting a problem should be to check the currently installed version. The latest version may contain a correction that fixes your particular problem.

  • Page 62: Emergency Recovery Procedure

    AXIS 241QA/AXIS 241SA - Troubleshooting Emergency recovery procedure If power or the network connection to theAXIS 241QA/AXIS 241SA 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.

  • Page 63: Symptoms, Possible Causes And Remedial Actions

    Symptoms, Possible Causes and Remedial Actions Problems setting the IP address Using ARP/Ping - the IP address Restart the server and try again. Ensure also the ping length is set to 408. (See the AXIS must be set within two minutes 241QA/AXIS 241SA Installation Guide) after power has been applied to the video server...
  • Page 64 AXIS 241QA/AXIS 241SA - Troubleshooting No images displayed in the Web interface Problem with AMC (Internet Explorer only) Installation of additional ActiveX component restricted or prohib- ited Video Image Problems Image too dark or too light. Black borders around the video image Problems uploading own files Missing images in uploads...
  • Page 65 Poor rendering of MPEG-4 Color depth set incorrectly on clients. Set to 16-bit or 32-bit color. images. If text overlays are blurred, or if there are other rendering problems, you may need to enable Advanced Video Rendering. This is done on the MPEG-4 tab in the AMC control panel applet. Ensure that your graphics card is using the latest device driver.

  • Page 66: Technical Specifications

    AXIS 241QA/AXIS 241SA - Technical specifications Technical specifications Item Models Video compression Resolutions Frame rate (NTSC/PAL) Video streaming Image settings Pan/Tilt/Zoom Audio (AXIS 241QA) Security Alarm and event management Specification • AXIS 241QA: Four video channels, two-way audio • AXIS 241SA: One video channel, two-way audio * Also available as Blade versions for Axis Video Rack Solution •...
  • Page 67 Item Specification Connectors • Analog composite video, • NTSC/PAL autosensing inputs: • AXIS 241QA: 4 BNC inputs • AXIS 241SA: 1 BNC input and 1 BNC output: loop through or Y/C video input • Ethernet 10BaseT/100BaseTX, RJ-45 • Terminal block: 4 alarm inputs, 4 alarm outputs, RS-485/422 half duplex port,...
  • Page 68 AXIS 241QA/AXIS 241SA - Technical specifications Item Included accessories Applications (not included) Accessories (not included) • AXIS 292 Network Video Decoder Approvals Dimensions (HxWxD) and weight Specification • Power supply 9 V DC, mounting brackets, connector kit, Installation Guide, CD with installation and management tools, software and User’s Manual, MPEG-4 licenses (1 encoder, 1 decoder), MPEG-4 decoder (Windows) •...

  • Page 69: General Performance Considerations

    General performance considerations When setting up your system, it is important to consider how various settings and situations will affect performance. Some factors affect the amount of bandwidth (the bit rate) required, others can affect the frame rate, and some will affect both. If the load on the CPU reaches its maximum, this will also affect the frame rate.

  • Page 70: Frame Rates - Motion Jpeg

    AXIS 241QA/AXIS 241SA - Technical specifications 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. •...

  • Page 71: Bandwidth

    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 •...

  • Page 72: Glossary

    AXIS 241QA/AXIS 241SA - Glossary Glossary Active Speaker - a speaker with a built-in power amplifier. ActiveX - ActiveX is a standard that enables software components to interact with one another in a networked environment, regardless of the language(s) used to create them.
  • Page 73 CCD (Charged Coupled Device) - This light-sensitive image device used in many digital cameras is a large integrated circuit that contains hundreds of thousands of photo-sites (pixels) that convert light energy into electronic signals. Its size is measured diagonally and can be 1/4", 1/3", 1/2"...
  • Page 74 AXIS 241QA/AXIS 241SA - Glossary Dome network camera - A remotely controllable camera mounted in a special housing, characterized by the dome shaped glass or plastic covering behind which the camera resides. Usually mounted on a ceiling and looking downwards, a dome camera can often rotate up to 360 degrees, thus providing excellent coverage of large areas.
  • Page 75 type of images (I-VOPs or P-VOPs) included in the stream, and their internal order. See also GOV and VOP. Half-duplex - See Full-duplex. HTML (Hypertext Markup Language) - HTML is the set of "markup" symbols or codes inserted in a file intended for display in web browser.
  • Page 76 AXIS 241QA/AXIS 241SA - Glossary JPEG (Joint Photographic Experts Group) - Together with the GIF file format, JPEG is an image file type commonly used on the web. A JPEG image is a bitmap, and usually has the file suffix '.jpg' or ".jpeg." When creating a JPEG image, it is possible to configure the level of compression to use.
  • Page 77 NVR (Network Video Recorder) - A dedicated Network Video Recorder (NVR) can be used to gather data streams from remote network cameras and video servers and store them on a hard disk. An NVR can be a standard networked PC, or a dedicated video recording hard disk server with its own software application.
  • Page 78 AXIS 241QA/AXIS 241SA - Glossary 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.
  • Page 79 identity of the server. Subnet & subnet mask - A subnet is an identifiably separate part of an organization's network. Typically, a subnet may represent all the machines at one geographic location, in one building, or on the same local area network (LAN).
  • Page 80 AXIS 241QA/AXIS 241SA - Glossary VPN (Virtual Private Network) - This creates a secure "tunnel" between the points within the VPN. Only devices with the correct "key" will be able to work within the VPN. The VPN network can be within a company LAN (Local Area Network), but different sites can also be connected over the Internet in a secure way.

  • Page 81: Index

    Index Action 39 Action buttons 30 Active/Inactive 11 Administrators 17, 45 Advanced TCP/IP settings 50 Alarm 39, 43, 58 Allowed IP addresses 45 AMC Viewer Toolbar 12 Anonymous viewers 45 ARP/Ping 49 Audio input 24 Audio mode 23 Audio output 25 Audio settings 23 Audio transmission 16 AXIS Internet Dynamic DNS Service 50...
  • Page 82 AXIS 241QA/AXIS 241SA - Index Maximum bandwidth 51 Motion detection 42 Motion JPEG 13, 16 MPEG-4 13, 16 MPEG-4 clients 16 MPEG-4 protocols 14 MPEG-4 settings 53 Multicasting 14 Network settings 49 Network traffic 51 Operators 46 Output buttons 11 Overlays 19 Overview 5 Own home page 29...
  • Page 83 AXIS 241QA/AXIS 241SA - Index Video streams 13, 15, 19...

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