User Guide for WBD
Contents
1. vali ace tern ai tov bev eaG 2 Box 3 Useful WBD Control Characters ccccceeeceeeeeeeeceeeeeeeeeeeeeeenneeeeeeees 4 Box 4 WBD CUISOM chica bee eee ia A Ae a he he 4 Box 5 Whiteboard Hint for Use ieee ecnetese rn tn arn etnenaat etretaecustilectetet ean 5 Figures Figure 1 Main WBD WInGOW 6 setae ante Saeed 3 WBD User Guide 1 Introduction WBD unicast and multicast shared workspace WBD can be used for either point to point videoconferencing involving a direct link between two hosts or for multiparty conferencing with many participants via the Internet Mbone see Box 1 Unicast and Multicast A unicast connection is like a telephone call which has one connection between two telephones for the duration of the call You should use 7 unicast if there are only two people in the conference and if one of you does not have access to multicasting In order to set up a unicast 7 N connection you must know the name of the computer that the person you want to have a conference with is going to use A multicast connection can in principle have an unlimited number of participants You should use multicast if it is likely that there will be more than two participants in the conference Tools like RAT VIC NTE WB and SDR have been specially developed for multicasting Box 1 Unicast and Multicast WBD is a WB clone which runs on all platforms but it is mainly being used as a whiteboard for the Windows2. 95 NT4 0 platform as WB is only available for UNIX platforms WBD is a relatively new tool and therefore less tested than the other tools and hence likely to be more unstable WBD however provides Windows95 NT4 0 users with a whiteboard which interoperates with WB on the UNIX platforms WBD is first and foremost a conferencing tool not a drawing tool You can think of it as a drawing tool with limited functionality 1 1 Getting started There are two ways of starting up WBD from the command line and from SDR 1 1 1 Starting up WBD from SDR When joining a conference with whiteboard from SDR WBD will start up automatically 1 1 2 Starting up WBD from the command line for a multicast conference Click on the Start button in the bottom left hand corner of the screen Select Run In the Run Window type the following in the open field Open wbd options lt address port gt WBD User Guide The multicast address should be in the range 224 2 0 0 224 2 255 255 except when using admin scope see Box 2 The port number should be at least 5002 So as an example this line would start WBD with a TTL of 48 See Box 2 for an explanation of TTL on the multicast address 224 2 4 70 and port number 5004 Open wbd t 48 224 2 4 70 5004 TTL TTL stands for Time To Live and determines how far the audio that you transmit will travel A TTL of 15 will reach other parts of your campus a TTL of 47 will reach all parts o
3. User Guide for WBD Version 1 DRAFT September 1998 University College London Computer Science Department WBD User Guide Acknowledgements This user guide is based on the UKERNA SHRIMP User Guide which will be available from http www ja net service _development video service_developments shrimp in dex html Currently this document is nearly identical to the appendix on WBD in the UKERNA guide but as opposed to the UKERNA guide this document will be updated as WBD gets updated insofar as is possible Disclaimer UCL cannot accept any responsibility for any loss or damage resulting from the use of the material contained in this document The information is believed to be correct but no liability can be accepted for any inaccuracies WBD User Guide Contents 1 INWOdUCON Eea nid naeieneeand 1 WAT AGUUING SANGO natch erin ak aie na aan aA 1 1 1 1Starting up WBD 1rOm SD Ris ice ceteteeterete cet cacertere eeeteeeretieeee 1 1 1 2Starting up WBD from the command line for a multicast conference 1 1 1 3Starting up WBD from the command line for a unicast conference 2 1 2 WBDIWWSeMOQUIdG Seti oie eae ei ote 3 Further REA G sinini tans wauaeeaseatasnastaiaen aaia raaraa Ma aa aAA Saarai taaa Paii 6 GlosSsSaiy a aae a aaa aee a a aea Ea aea a a aAa a ENa a da Ea SEAE E a 7 Boxes Box 1 Unicast and Multicast xi scet ce tecetece tates ete eteraiaes ete ieee ne eteeneeed 1 Box 2 TTL and Admin SCOpe ii lt 0
4. ave finished writing it i e clicked with your mouse elsewhere A You cannot edit other peoples text To change the text font Click on the Font button on the right hand side of the Main WBD Window and select a font from the menu To change brush size for drawing Click on the Width button on the right hand side of the Main WBD Window and select a brush size from the menu Your cursor Only you can see your mouse cursor To point to something for all 7 participants to see you must make a mark on the page underline 7 N circle or draw an arrow pointing to it You can subsequently erase this pointer Box 4 WBD cursor WBD User Guide To change the colour for text and drawing Click on the Colour button in the right hand side of WBD and select the colour you want on the colour palette It is normally a good idea for each participant to use a different colour so that it is easy to see who is writing or drawing what amp You cannot change the colour of text or drawings already in the WBD only text or drawings that you are about to make To change the orientation of the whiteboard Click on one of the four bottom most buttons on the right hand side of the Main WBD Window depending on which orientation you want You cannot save or print the contents of the WBD To get a new blank page Each page in WBD is a set size it does not have scroll bars So if you run out of space you can get a new page by clicki
5. e transfer of information between computers over a network or via telecommunications systems To reduce errors the computers at both ends of a communications link must follow the same protocol Receive only A condition where a tool is used to receive information but cannot transmit SDR Multicast Session Directory TTL WBD User Guide TTL stands for time to live and determines how far multicast packages can travel over the Internet The standard values are 16 Site 47 UK 63 Europe 127 World Unicasting A unicast connection is a point to point connection between two specific machines WB Whiteboard WBD WB clone which can run under Windows95 NT4 0
6. f the JANET Mbone a TTL of 63 reaches Europe and 127 worldwide The default for all the Mbone tools is a TTL of 16 NAZ Admin scope ILAN There is currently a move away from using TTL for scoping conferences to using admin scopes Using admin scope will limit conferences more accurately and is more sophisticated than specifying a TTL Like TTL scopes admin scopes need to be set up by the network administrator When the scopes have been configured you will get a range of addresses for each of the scopes defined Using an address in the range provided will limit your conference to that scope Example If local scope is defined as addresses in the range of 239 0 0 0 239 100 255 255 any conference on addresses in this range will be restricted to the local area as defined by the network administrator The most widely used method for scoping is still TTL so you should contact your local systems administrator to see if admin scopes have been set up If not you should ask them to do it Box 2 TTL and Admin scope In the example above the user has used the option t to specify the TTL TTL determines how far the audio packets will go i e how far away you can talk to people A TTL of 48 is generally large enough for communication within the UK amp All participants must use the same multicast address and port number in order to see one another in WBD 1 1 3 Starting up WBD from the command line for a unicast co
7. for each networked host computer The IP address is used in conferencing when the conference is point to point rather than multiparty LBL Lawrence Berkeley Laboratories University of California Berkerley USA Mbone The multicast capable backbone of the Internet It currently consists of a network of tunnels linking the islands of multicast capable sub networks around the world Multicasting Multicasting is sending audio video etc on the Internet in way which ensures that anybody who is interested in receiving the information can receive it but only people who are interested will receive it Think of it as being in between unicast like most telephone calls between two telephones only and broadcast TV the signals are sent to you whether you want to watch or not Multicast address Addresses used for multicast conferencing should be in the range 224 2 0 0 224 2 255 255 Note Multicast addresses must be agreed upon in advance of the multicast session either through e mail or phone or assigned using SDR Network congestion A condition in an IP network where the amount of traffic injected into the network is too great for the routers to handle and some packets are discarded Port A UDP User Datagram Protocol number unique to the broadcast session and should be over 5000 Note The port number must be agreed upon in advance either through e mail or phone or assigned using SDR Protocol A set of standards that govern th
8. nference As with the other Mbone tools the command format is WBD User Guide Click on the Start button in the bottom left hand corner of the screen Select Run In the Run Window type the following in the open field Open wbd options lt remote_hostname port gt So as an example this line would start WBD for a unicast conference with someone on the computer called myhost example ac uk on port 5004 Open wbd myhost example ac uk 5004 The person at the other end in this case the person who is working on myhost example ac uk will have to do the same command but with the name of your computer instead of myhost example ac uk A TTL is not applicable in unicast sessions 1 2 WBD user guide Whiteboard olx For moving text or drawings To delete For copying text or drawings Point to the item you would like to delete For typing text and left click while holding down the For making freehand drawings Ctrl key on the keyboard For drawing straight lines For drawing arrows For drawing squares For drawing circles For selecting colour for drawing or typing For selecting the width of the brush for drawing For getting a new page For selecting the font for typing For importing PostScript files For changing the orientation to normal landscape For changing the orientation to normal portrait For importing text files For changing the orientation to upside down landscape For changing the orientation to upside down
9. ng the New Page button in the bottom left hand corner of the Main WBD Window see Figure 1 No matter which page you are on when you create a new page WBD will automatically insert the new page as the last page and move you on to the new page If you are on page 2 of 10 pages currently created the new page will be page 11 and you will be moved to it Hints on use e It is a good idea to begin by typing your name It is also helpful if all participants choose a unique font colour combination This makes it easier to distinguish individual s contributions and reduces the need to sign or initial each contribution N e WBD is a shared whiteboard and does not provide the functionality of a general purpose drawing tool If you need quality LX slides or diagrams it is best to prepare them beforehand in minimal PostScript format and import them into WBS using the Import PostScript function provided e Creating new pages by clicking the New Page button is faster than erasing the current page It has the additional benefit of maintaining the previous pages for future reference Box 5 Whiteboard Hint for Use WBD User Guide Further Reading For further information about the JANET Mbone service see the JANET MBONE Service Technical Guide The guide is available from http www ja net documents mbone 3 4 ps WBD User Guide Glossary IP address IP Internet Protocol addresses are unique numerical identifiers
10. portrait Scroll bar for changing between pages Figure 1 Main WBD Window To type Select the button labelled T in the Main WBD Window see Figure 1 Position your mouse pointer where you would like your text to appear and type using the keyboard If you move the mouse while typing the letters will still appear wherever the mouse pointer is WBD User Guide Useful WBD Control Characters e BACKSPACE will delete the last typed character Z e Carriage return will start a new line under the start of the l N previous line e CTRL left mouse click will delete the text or drawing under the mouse pointer Box 3 Useful WBD Control Characters To draw Select the appropriate icons for what you want to draw see Figure 1 Using any of these tools is essentially the same as using any basic drawing program To delete Point to the text or drawing that you would like to delete Then hold the Ctrl button down on the keyboard and left click with the left mouse button A You can only delete your own contributions in this way If you want to delete other participants text or drawing you have to paint over them If the background colour of the WBD is white you can select one of the drawing icons and the colour white and use the mouse to paint on top of the text or drawing that you want to delete Remember to switch to another colour again for writing and drawing amp You cannot edit text once you h
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