VBrick Systems VB6000 Network Considerations, Assigning Multicast Addresses, Video Resolution

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Table 4. Video Resolution

Video Resolution

NTSC

PAL

 

 

 

Full D1

720 x 480

720 x 576

 

 

 

2/3 D1

480 x 480

480 x 576

 

 

 

1/2 D1

352 x 480

352 x 576

 

 

 

SIF

352 x 240

352 x 288

 

 

 

Network Considerations

A number of features that address video stream handling across networks are described below. These include:

Assigning Multicast Addresses

IP Address Configuration using Host Names

IP Differentiated Services (Diffserv)

VBrick Video Stream Handling

Network Jitter

Assigning Multicast Addresses

Many factors must be considered when designing a multicast address infrastructure since Ethernet switch implementations can significantly vary between vendors. Furthermore, multicast addressing techniques rely on an Ethernet to IP Address mapping rule, which does not guarantee a unique physical address. In fact, it is possible to create multicast addresses that differ from an IP perspective, but overlap when presented to the Ethernet network. Addresses created in this situation can cause significant network and operational problems.

Specifically, multiple IP Addresses are mapped into the same physical layer address. For example, all IP multicast addresses with the same or differing first octet, and the second octet differing by exactly 128, map to the same physical address (226.5.5.4, 227.5.5.4, and 228.133.5.4 all map to the same physical address).

Another factor to keep in mind when assigning multicast addresses is that 224.x.x.x is a range containing reserved addresses, particularly in the range 224.0.0.x. For example, 224.0.0.1 is the 'all hosts' multicast address and 224.0.0.2 is the 'all routers' reserved address. Other 224.0.0.X numbers are reserved for RIP, OSPF, DVMRP, etc. Here are some recommended rules for multicast IP Address assignment:

1.Do not use 224 in the first octet since many of these are reserved.

2.Use a digit between (225–239) for the first octet and standardize on it for each network.

3.In the second octet, either use numbers from 1–127, or 129–255, do not mix ranges on a given network.

IP Address Configuration using Host Names

This feature provides VBricks the ability to unicast to one another, recognizing each other by Host Name instead of IP address. This is especially useful when appliances are running DHCP, since IP addresses can change between being rebooted, whereas Host Names remain the same unless manually changed by the user. Each IP address that can be configured using

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© 2008 VBrick Systems, Inc.

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Contents VB4000-5000-6000 Series Network Video Appliances Copyright Contents Using the IR Remote Command Line InterfaceIntegrated Web Server VB6000 Reference IndexContents Organization For More InformationGetting Help Font ConventionsPrinter-Friendly Setup Overview Topics in this chapterUsing the Quick Start Guide COMAppliance Setup Connect Output to a Video MonitorConnect an Audio/Video Input Source Set the IP Address Power-on the ApplianceConnect to the IP Network Get the IP Address from a Dhcp ServerSet the IP Address with the Remote Control Set the IP Address with HyperTerminalInstall StreamPlayer Plus Verify OperationVerify Mpeg 2 Operation Verify Mpeg 4 OperationVerify WM Operation StreamPlayer Plus Installing a System Upgrade OverviewPassword button Management Tools VBrick Tool DescriptionFront Panel Edit VBDirectoryManagement Tools Telnet Simple Network Management ProtocolVBrick SDK VBrick Systems, Inc Understanding I, B, P Frames, Delay, and Synchronization Video BasicsMPEG-2 Encoder Compression Group of Pictures GOP Reference DistanceInterrelationship MPEG-2 Delay GOP Length N Reference Frame DistanceMPEG-4 Encoder Compression Receiver Sensitivity Transmit PowerMPEG-2 Audio MPEG-4 AudioGetting the Best Video Network Considerations IP Address Configuration using Host NamesVideo Resolution Assigning Multicast AddressesIP Differentiated Services Diffserv Priority Level Type of ServiceNetwork Jitter Typical ApplicationsVBrick Video Stream Handling Ethernet IPOne-Way Broadcast and Desktop Streaming Two-Way Interactive Conferencing VBrick Accessories Serial Port PassthroughHow Passthrough Works Serial Port Passthrough Using Telnet Picture-in-Picture Mpeg FeaturesBillboard Embedded Web BrowserWM Features VBrick Systems, Inc Using IWS Integrated Web ServerLogin User Level Default User Name Default Password PrivilegesWelcome Screen Menu Options Option DescriptionView Mode Making ChangesRebooting Edit ModeUsing Apply, Revert, and Defaults LogoutServing Custom ASX and Html Files Multiple AppliesVBrick Systems, Inc Front Panel Edit Key DescriptionError Message Description Dialog Window DescriptionMPEG-2/MPEG-4 Remote Control Controlling a VBStar Button Description Billboard Controlling VBrick FeaturesPicture In Picture Icon DescriptionConference Guide WM Remote Control Program GuideConnecting with HyperTerminal Connection ModesConnecting with Telnet MIB-Based Command Line Interface Command Response Finding VBrick ParametersSetting VBrick Parameters Using a MIB BrowserLogging Using Get/Set Variable Commands Using Get/Set Table CommandsBeginning or Ending an Edit Session VBrick Stab vbrickSlot1EncoderHttpPushEnable.3=2 Error Handling Applying ChangesSaving Changes CLI Examples Example 1 Set VariableExample 4 Get Table Variables Example 2 Get VariableExample 3 Set Multiple Variables Example 5 Set Table VariablesCLI Sample Script Forever Menu-Based Command Line Interface Editing Configuration Parameters Setting and Changing ParametersSetting System Date and Time Selecting Parenthetical ItemsUsing Spaces Other Editing KeysSeries Encoder Models VBrick Appliance ModelsVB6000 Series Decoder ModelsVB6000 Expanded Vbssm Expanded Vbssm Activity LEDSequence Color Description Solid. Indicates no Video In otherwise the LED is off Device InterfacesRS-232/422/485 COM Port Pinouts Pin Function DirectionEthernet Port Power In Entry InterfacePower Out Exit Interface Video-In and Video-Out CompositeAudio In and Audio Out Video-In and Video-Out S-Video InterfaceAudioMate Pin Description TypeVpp Balanced Relay Port Event Triggering Activity LEDChange RTS/DTR Control to Force On and click Apply VBrick Systems, Inc Index Index
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