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Selecting Videoconferencing Equipment for HEP Applications
 

Selecting Videoconferencing Equipment for HEP Applications

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    Selecting Videoconferencing Equipment for HEP Applications Selecting Videoconferencing Equipment for HEP Applications Presentation Transcript

    • Selecting Videoconferencing Equipment for HEP Applications Geoff. Fayers [email_address]
    • Current Narrowband VC “Standards”
    • Standards & VRVS
      • VRVS uses Hybrid (MBONE) “standards”
        • Experimental - not IETF or ITU
        • Need > 1GMip for 30fps
        • Limited use of MMX
        • Insufficient parallelisation
        • Common s/ware components are vic, rat, wbd, (sdr)
      • Beginning to support H.323
        • For quality, need hardware DSPs
    • Recommendation 1
      • Limit investment in A/V Capture cards for ‘old’ VRVS and MBONE
      • Decide how scalable you want H.323
      • Decide whether ISDN important
      • Decide whether investment incremental or strategic
    • The ITU Standards: H.320
      • H.320 - < 2MBits/sec, ISDN
      • Each ISDN channel is 64KBits/sec
        • ISDN-2 = 128 KBits/sec
        • ISDN-6 = 384 Kbits/sec
        • Can also use ISDN-4 @ 256 KBits/sec
        • Minimum is one channel @64KBits/sec
        • (a good test of standards’ compliance)
      • For channels beyond 2, need BONDING
        • Mode 1 prevails for this application
    • The ITU Standards: H.323
      • Packet-based
      • Up to 2 Mbits/sec, adaptive
      • Transmission technology undefined
      • FR sometimes used
      • Consider only IP networks here
    • Other Standards
      • Mbone IETF tools: sdr, vic, rat, wbd,…..
      • H.310 & H.321 for B-ISDN (ATM)
      • H.324 for low bit rate videotelephones
      • ……… .others
      • T.120 - T.140 - data sharing
        • …… MS NetMeeting commonest implementation
        • Others platform-specific
      • SIP (RFC2543, Mar. ‘99)
    • T.120
      • The “missing component” of VC systems
      • Includes whiteboarding, ftp and application sharing
      • DataBeam’s FarSite most successful interim product ….. But now swallowed up (Lotus)
      • Intel’s ProShare Premier a strong alternative
      • PictureTel had LiveShare Plus.…but no more
    • More T.120
      • Also-rans are MediaRing (Mediacom), TALKShow (FutureLabs)
      • Most DTVC suppliers have moved to MS NetMeeting
      • NetMeeting dominates at present :
        • DC-Share (DataConnection)
        • Netopia Virtual Office (Farallon Comms.)
        • Timbuktu Pro (Farallon Comms.)
      • PictureTel (Q4/97), VCON, VTEL, Sony, Zydacron, Vis à Vis, GPT and MMT all offer NetMeeting BUT ……….
    • What about MS NetMeeting?
      • Implements modified T.120 stack for data sharing
      • Designed to prevent interoperability with strict T.120 implementations
      • Security risk
    • More about MS NetMeeting…..
      • Also implements H.323…….
      • Example of a software-based codec
      • Intel ProShare is another
      • Suggestion: Do NOT use for a/v
      • Users will ignore one-to-one restrictions
      • Problems in UK VIP and Megaconf.
      • Probably banned next this year
      • Development??
    • MBONE Answers to T.120
      • wb
        • Shared whiteboard, text and postscript drawings
      • nt
        • Shared text editing tool for ASCII
      • qb
        • 20% increase in remote audience participation
      • More tools under development….
    • SIP vs H.323
      • SIP is IP exclusively
      • SIP less complex - cheaper to implement
      • SIP easier debug - text messages/commands
      • SIP Client/Server arch. - security, mg’mnt
      • SIP easier Firewall handling
      • SIP more scalable
    • Future of H.323
      • Originally intended for LAN
      • Has come a long way for Internet use
      • Despite slow take-up…..
      • H.323 will persist for ~5 years or more
      • Will bridge with ISDN, ATM and PSTN
      • Will integrate e/mail, voice mail, fax, call centres, VC
      • GSM integration underway….
      • Too much investment to abandon
      • Still developing…...
    • More on Future of H.323
      • 2 Revisions of standard
      • More may be expected…..
      • Several Annexes
      • Annexe D important for HEP…..
      • Limited implementations
    • H.320, H.323 and T.12* Implementations
      • H.320 in hardware, firmware and software -
        • Desktop hosts include Win98, Win2000, WinNT
        • No linux hosts
      • H.323 in hardware, firmware and software -
        • Desktop hosts include Win98, Win2000, WinNT
        • No linux yet
        • Some Mac - fast changing
      • T.12* in software
        • MS NetMeeting prevails, but others exist for UNIX and esp. for WinXX
    •  
    • Range of VC Systems 0 2 4 6 10 12 14 16 8 ISDN-6 ISDN-2 H.323? Line Speed/ Quality ATM POTS Capture Cards/Videophones PC DTVC H/wired DTVC Rollabout Room - based Room - based PC DTVC £ K
    • Conclusion for Desktops….
      • For data sharing , use NetMeeting
      • ===> Win98, WinNT, maybe Win2000
      • But there are problems even then…….
    • H.323 and Firewalls
      • Must have Rev. 2 compliance
      • S’ton have tested two
      • Axent’s Raptor looks good
      • CheckPoint’s Firewall-1 appears to be OK now
      • Edu prices comparable, tho’ Raptor not in CHEST
      • Cisco PIX may now be alright…..
      • No linux recommendations
      • Problems with NetMeeting V2.*
    • Conclusions for Firewalls
      • If you are behind one on campus, check its H.323 rev. 2 capability
    • H.323 Protocol Stack H.323 Endpoints H.323 Gatekeeper H.323 VIU H.323 Gateway H.323 MCU
    • MCU Facilities
      • At UCL (Pete Clarke)
      • At Edinburgh
        • G.J.Fayers@ic.ac.uk or
        • [email_address]
      • Both Experimental
      • No Direct Booking!
    • Entry Level Recommendations 2
      • Use a PC with Win98 or WinNT
      • Zydacron Z353 at £995.0 + VAT
      • Augment with Polyspan SoundPoint PC at about £80 + VAT
      • Get additional headset from supplier of Z353
      • Make supplier responsible for integrating the extras
      • Use NetMeeting V3.1
      • Recognise the limitations
    • A Cheaper Entry Level Option
      • For laptops, Win98 Polyspan ViaVideo at about £400 + VAT
      • but….
        • Changing IP address….
        • Multiple IP addresses…..
        • Win2000 + X-Active + NetMeeting + ViaVideo
        • Camera
    • Polyspan ViaVideo
    •  
    • An Alternative - VCON ViGO
    • Z353 vs ViaVideo
      • Z353
      • Single PCI half-length board
      • ISDN-2 and IP
      • S-Video aux input
      • Headset, camera mics
      • Aux. Line out
      • Win98, WinNT, Win2000
      • Suitable for rollabout PC
      • £995 + VAT
      • ViaVideo
      • External USB connection
      • IP only
      • No auxiliary inputs
      • Built-in mic only
      • Uses audio out in PC
      • No WinNT support
      • Portable to e.g. ‘plane
      • £~400 + VAT
    • A Scalable Alternative
      • Zydacron Z360 costs ~ £1,500
      • Single full length PCI board
      • For ISDN, also need ZC206 @ £1,750
      • Buy together for £2,995 + VAT
      • Capable of TV output, SVideo aux. Input
        • So two cameras or document camera
      • Auxiliary mic. Input too
      • Aux. Line output too
      • Built-in echo cancellation
    • Echo Cancellation - A Superb Multiway Solution?
    • Queries?
      • Next edition of “Recommendations” late Spring
        • Will include mid-range and some high-end recommendations
      • Information on cameras, doc. Cameras, other add-ons
      • Queries to G.J.Fayers@ic.ac.uk
    •