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<!DOCTYPE html> <html lang="en-us"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link rel="icon" href="http://www.zytrax.com/favicon.ico"> <title>ZYTRAX - Consulting and Training</title>   <style type="text/css">  </style> <style type="text/css" media="print">  </style> <script type="text/javascript">  </script> </head> <body>  <div class="l-b"> <a href="http://www.zytrax.com"><img id="toplogo" src="http://www.zytrax.com/images/zytrax-logo-services.gif" alt="ZYTRAX Open Logo"></a>  <p class="n-t-t"><a href="http://www.zytrax.com/feedback.htm" class="n-t-sr">mail us</a>  |  <a href="http://www.zytrax.com/run/mailpage.php" class="n-t-sr">mail this page</a></p> <div class="n-t0"> <a href="http://www.zytrax.com/Company/contacts.html" class="n-t-sr">contact us</a> </div> <div class="n-t0"> <a href="http://www.zytrax.com/training/" class="n-t-sr">training</a>  |  </div> <div class="n-t0"> <a href="http://www.zytrax.com/tech/" class="n-t-sr">tech stuff</a>  |  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apache" href="http://www.zytrax.com/tech/web/browser_sniffing.html" class="t-da">browser sniffing</a></li> <li class="n-t3-e"><a title="apache environmental variables" href="http://www.zytrax.com/tech/web/env_var.htm" class="t-da">apache env's</a></li> <li class="n-t3-e"><a title="apache server side includes - extensive notes and examples" href="http://www.zytrax.com/tech/web/ssi.htm" class="t-da">apache ssi</a></li> <li class="n-t3-e"><a title="our css pop-up/pop-down/flyout menus for Gecko/Opera/MSIE" href="http://www.zytrax.com/tech/css/workarounds.html#popout" class="t-da">pop-outs (css)</a></li> <li class="n-t3-e"><a title="most of those annoying HTML entity codes that we forget all the time" href="http://www.zytrax.com/tech/web/entities.html" class="t-da">html entities</a></li> </ul> </li> <li class="n-t2-es t-da">open guides <ul class="n-t3"> <li class="n-t3-e"><a href="http://www.zytrax.com/books/" class="t-da">open guides</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/books/dns" class="t-da">dns guide</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/books/ldap" class="t-da">ldap guide</a></li> </ul> </li> <li class="n-t2-e"><a title="Decimal to Hexidecimal to Binary conversion - even Octal!" href="http://www.zytrax.com/tech/protocols/hex.html" class="t-da">Dec>Hex>Bin</a></li> <li class="n-t2-es t-da">survival stuff <ul class="n-t3"> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/survival/" title="a series of survival guides for some popular open source software" class="t-da">survival stuff</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/survival/ssl.html" class="t-da">ssl/tls & x.509</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/survival/asn1.html" class="t-da">ASN.1</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/survival/kerberos.html" class="t-da">kerberos</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/survival/postfix.html" class="t-da">postfix</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/survival/cron.html" class="t-da">cron</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/survival/encryption.html" class="t-da">cryptography</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/survival/wxwidgets.html" class="t-da">wxWidgets</a></li> </ul> </li> <li class="n-t2-es t-da">audio stuff <ul class="n-t3"> <li class="n-t3-e"><a title="Pages about Digital Audio, Primers, Calculator, Equalization, FFT" href="http://www.zytrax.com/tech/audio/" class="t-da">audio stuff</a></li> <li class="n-t3-e"><a title="Fundamentals, harmonics, overtone, partials, loudness, ADSR envelopes" href="http://www.zytrax.com/tech/audio/sound.html" class="t-da">sound primer</a></li> <li class="n-t3-e"><a title="Sound digitization, time domain, frequency domain" href="http://www.zytrax.com/tech/audio/digital-sound.html" class="t-da">digital sound</a></li> <li class="n-t3-e"><a title="common frequencies of instruments and in life" href="http://www.zytrax.com/tech/audio/audio.html" class="t-da">frequencies</a></li> <li class="n-t3-e"><a title="equalization principles, octaves, sound metering and FFT" href="http://www.zytrax.com/tech/audio/equalization.html" class="t-da">equalization</a></li> <li class="n-t3-e"><a title="Acoustic caculators for musical notes and FFT bin frequencies" href="http://www.zytrax.com/tech/audio/calculator.html" class="t-da">calculators</a></li> <li class="n-t3-e"><a title="Yet another audio glossary" href="http://www.zytrax.com/tech/audio/glossary.html" class="t-da">glossary</a></li> </ul> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/web/regex.htm" class="t-da">regex stuff</a></li> <li class="n-t2-es t-da">cable stuff <ul class="n-t3"> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/layer_1/" class="t-da">cable stuff</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/layer_1/cables/tech_lan.htm" class="t-da">lan 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class="n-t3-e"><a href="http://www.zytrax.com/tech/protocols/ip-classes.html" class="t-da">ipv4</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/protocols/ip-classes.html#calculator" class="t-da">ipv4 Calculator</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/protocols/ipv6.html" class="t-da">ipv6</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/protocols/ipv6.html#calculator" class="t-da">ipv6 Calculator</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/protocols/isdn" class="t-da">isdn-bri</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/protocols/lan" class="t-da">802 lan</a></li> <li class="n-t3-e"><a href="http://www.zytrax.com/tech/ss7" class="t-da">ss7 & sigtran</a></li> </ul> </li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/pc/" class="t-da">pc stuff</a></li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/wireless/" class="t-da">wireless stuff</a></li> <li class="n-t2-es t-da">css stuff <ul class="n-t3"> <li class="n-t3-e"><a title="collection of css notes and experiences including css menus and css liquid layout" href="http://www.zytrax.com/tech/css/" class="t-da">css stuff</a></li> <li class="n-t3-e"><a title="Notes on our experience with converting to css based liquid layouts - including blow by blow css" href="http://www.zytrax.com/tech/css/layoutnotes.html" class="t-da">css liquid design</a></li> <li class="n-t3-e"><a title="we have used css menus since mid-2003 - blow-by-blow implementation notes" href="http://www.zytrax.com/tech/css/workarounds.html#popout" class="t-da">css menus</a></li> <li class="n-t3-e"><a title="some practical solutions on using css" href="http://www.zytrax.com/tech/css/workarounds.html" class="t-da">css notes</a></li> <li class="n-t3-e"><a title="css shortforms at a glance" href="http://www.zytrax.com/tech/css/shortcut.html" class="t-da">css short-forms</a></li> <li class="n-t3-e"><a title="css selectors and quick overview with links to the W3C specs" href="http://www.zytrax.com/tech/css/syntax.html" class="t-da">css overview</a></li> </ul> </li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/codes.htm" class="t-da">ascii codes</a></li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/data_rates.htm" class="t-da">data rate stuff</a></li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/telephony/" class="t-da">telephony stuff</a></li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/mech/" class="t-da">mech. stuff</a></li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/protocols/hex.html" class="t-da">Dec>Hex>Bin</a></li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/lang/" class="t-da">language stuff</a></li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/electronics/" class="t-da">electronic stuff</a></li> <li class="n-t2-e"><a href="http://www.zytrax.com/tech/rfcs/" class="t-da">rfc stuff</a></li> </ul> </li> <li class="n-t1-e"><a href="http://www.zytrax.com/security/" class="t-da">Security</a></li> </ul> </div>  </div> <div class="l-c">  <h1>ZYTRAX - Consulting and Training</h1> <p>ZYTRAX provides consulting, training and development services for a selected range of Information Technology (IT) based on our development, marketing and marketplace knowledge. We have increasingly, over the last ten years, been specialising in Open Source technology.</p> <p>We can uniquely mix in-depth technical expertise with a knowledge of marketing and the marketplace. Which for guys in the Open Source arena, frankly, makes us more than a little unique. We are adamantly not just <b>techies</b>.</p> <p>We typically contract on a <b>fixed-price</b> basis for a defined work program (which we will help you to create if it does not currently exist). We provide resources on a hourly, daily, weekly or monthly basis depending on your needs. We'll be as flexible as you need.</p> <p>We typically ask for a single point of contact in a client organization for operational efficiently with whom we can request guidance, clarification, arrange meetings and obtain further information. Clearly other parties may be present during reviews and other formal events.</p> <p>Finally we are not just consultants. If we say during a study that X can be done for $Y. Then we will contract at $Y to do X.</p> <h2>Areas of Expertise</h2> <p>You are welcome to browse the left hand menu which illustrates the scope of information that we make available as a service to the community. We claim in-depth expertise in the following areas:</p> <ul> <li><p><u>Communications</u> - to illustrate - <a href="../tech/protocols/tcp.html" class="t-db">IP (TCP, UDP, ICMP)</a>, PPP, LCP, IPCP, SCTP, NAT, multi-cast (IGMP, OSPF), <a href="../tech/ss7/" class="t-db">SS7, SIGTRAN</a>, <a href="../tech/protocols/isdn/" class="t-db">ISDN, X.25</a>, <a href="../tech/protocols/lan/" class="t-db">802.3 LAN</a>, HTTP, DHCP, <a href="../books/dns/" class="t-db">DNS</a>, MLPS, RTP, <a href="../tech/protocols/multimedia_stds_itu.htm" class="t-db">H.323</a>, SIP, RTP/RTCP, Diffserv, RSVP etc., etc. ad nauseam.</p></li> <li><p><u>Open Source</u> - Linux, FreeBSD, DragonFlyBSD, BIND 9.x, Apache (1.x, 2.x), email (Courier, Postfix, IMP), Squid, ipchains, ipfw, <a href="../books/ldap/" class="t-db">OpenLDAP/Apache DS</a>, MySQL, PostGreSQL, SQLite, OpenOffice/LibreOffice, Gimp, CMS, and others too numerous to list.</p></li> <li><p><u>Language Systems</u> - Ruby, C/C++, PHP, Python, Javascript, Visual Basic, HTML, CSS, XML</p></li> </ul> <p>We have significant expertise in (and are users of) Windows systems including Windows 7, 8 and 10, Windows Server 2012.</p> <p>We elaborate below on the typical scope of work carried out under the topics listed below:</p> <ul> <li><a href="#feasibility" class="t-db">Feasibility and Commercial Studies</a></li> <li><a href="#technology" class="t-db">Technology Studies</a></li> <li><a href="#design" class="t-db">Design, Planning and Audit Studies</a></li> <li><a href="#open" class="t-db">Open Source Studies</a></li> <li><a href="#../training" class="t-db">Training Services</a></li> </ul> <h2 id="feasibility">Feasibility and Commercial Studies</h2> <p>These studies typically fall into the 'can we do this ... cost effectively?' or 'we have this problem how do we solve it .. cost effectively' categories.</p> <p>While all cases are unique the following table illustrates a typical work cycle:</p> <table class="t-m-s"> <tr class="g-h-n"> <td class="w-200">Phase</td> <td>Content</td> </tr> <tr> <td>Statement of Requirements</td> <td><b>Report</b>. Identifies and prioritizes requirements. Includes competitive review. Mandatory and Optional Requirements. Confirms understanding of all parties. Typically 10 - 20% of work content.</td> </tr> <tr> <td>Review Requirements</td> <td>First Review. Buy-in, revision cycle.</td> </tr> <tr> <td>off-the-shelf</td> <td>These may include competitive solutions. Typically 5 -10% of work content.</td> </tr> <tr > <td>Solution Matrix</td> <td>Functionality by potential solution - off-the-shelf, classic methodologies, out-of-the-box methodologies. Typically 15 - 25% of work content.</td> </tr> <tr > <td>Budgetary Costings</td> <td>Functionality/cost by potential solution - off-the-shelf, classic methodologies, out-of-the-box methodologies. Typically 5 - 10% of work content.</td> </tr> <tr > <td>Preliminary Report</td> <td><b>Report</b>. Identifies, prioritizes and costs requirements using off-the-shelf, classic and out-of-the-box solutions. Typically 5 - 10% of work content.</td> </tr> <tr > <td>Second Review</td> <td>A single/dual solution set will be identified which will guide the final phase work content.</td> </tr> <tr > <td>Project/System Design and Plan</td> <td>Detailed design, development methodology, resources, detailed costing, special services, milestones. Multi-phase deliverables in priority order. Early first phase deliverable always. Typically 20 - 30% of work content.</td> </tr> <tr > <td>Draft Project/System Plan</td> <td><b>Report</b>. Detailed design, development methodology, resources, detailed costing, special services, milestones. Typically 20 - 30% of work content.</td> </tr> <tr > <td>Third Review</td> <td>Review and presentation.</td> </tr> <tr > <td>Revision Cycle</td> <td>Comments, corrections and feedback. Typically 5 - 10% of work content</td> </tr> <tr > <td>Project/System Plan</td> <td><b>Final Report</b>. Detailed design, development methodology, resources, detailed costing, special services, milestones. Follow up as required.</td> </tr> </table> <h2 id="technology">Technology Studies</h2> <p>These studies typically fall into the 'what technologies are going to affect (or threaten) us over the next n years ' or 'where should we put our resources over the next n years' categories.</p> <p>While all cases are unique the following table illustrates a typical work cycle:</p> <table class="t-m-s"> <tr class="g-h-n"> <td class="w-200">Phase</td> <td>Content</td> </tr> <tr > <td>Value Added Statement (VAS)</td> <td><b>Report</b>. Identifies value-added versus commodity aspects of technology used in current operations/products. Includes competitive review. Confirms understanding of all parties. Typically 20 - 30% of work content.</td> </tr> <tr > <td>Review Value Added Statement</td> <td>First Review. Buy-in, revision cycle.</td> </tr> <tr > <td>Technology Matrix</td> <td>Technology review based on Value Added Statement - off-the-shelf, classic methodologies, out-of-the-box methodologies. Trends and technology evolution (3 - 5 years, 5 years plus). Typically 25 - 40% of work content.</td> </tr> <tr > <td>Preliminary Technology Report</td> <td><b>Report</b>. Identifies and prioritizes technologies - off-the-shelf, classic methodologies, out-of-the-box methodologies. Trends and technology evolution (3 - 5 years, 5 years plus) against value added Statement.</td> </tr> <tr > <td>Second Review</td> <td>Prioritization and feedback.</td> </tr> <tr > <td>Draft - Technology Plan</td> <td>Develop key technology areas, resources, implications, training, cost and expertise profiles based on the Technology Report. Typically 20 - 30% of work content.</td> </tr> <tr > <td>Third Review</td> <td>Review and presentation.</td> </tr> <tr > <td>Revision Cycle</td> <td>Comments, corrections and feedback. Typically 5 - 10% of work content</td> </tr> <tr > <td>Technology Plan</td> <td><b>Final Report</b>. Follow up as required.</td> </tr> </table> <h2 id="design">Design, Planning and Audit Studies</h2> <p>These studies typically fall into the 'where are we in the development cycle' or 'this project is late .. how do we get it back on track' or 'our customers keep changing the requirement' categories.</p> <p>These studies can be highly controversial and we require a clear understanding of the remit and terms of reference before commencing work. We are then fearless in our recommendations.</p> <p>While all cases are unique the following table illustrates a typical work cycle:</p> <table class="t-m-s"> <tr class="g-h-n"> <td class="w-200">Phase</td> <td>Content</td> </tr> <tr > <td>Statement of Requirement</td> <td><b>Report</b>. Identifies and prioritizes requirement. Validates Requirements if they exist. Includes competitive (off-the-shelf) review. Mandatory and Optional Requirements. Confirms understanding of all parties. This phase typically focuses almost exclusively on the customer side of the equation. Typically 10 - 25% of work content.</td> </tr> <tr > <td>Review Requirements</td> <td>First Review. Buy-in, revision cycle.</td> </tr> <tr > <td>Current Position Report</td> <td><b>Report</b>. Identifies, prioritizes and costs requirements. Statement of work complete and resources used to date. Alternate approaches including off-the-shelf, classic and out-of-the-box solutions. Completion estimates based on current and alternate programmes. Typically 20 - 30% of work content.</td> </tr> <tr > <td>Second Review</td> <td>Strategy review. Single/dual solution approach.</td> </tr> <tr > <td>Project Plan</td> <td><b>Report</b> Develop detailed plan, development methodology, resources, costing, special services, milestones. Typically 20 - 30% of work content.</td> </tr> <tr > <td>Third Review</td> <td>Review and presentation.</td> </tr> <tr > <td>Revision Cycle</td> <td>Comments, corrections and feedback. Typically 5 - 10% of work content</td> </tr> <tr > <td>Project/System Plan</td> <td><b>Final Report</b>. Final Detailed design, development methodology, resources, detailed costing, special services, milestones. Follow up as required.</td> </tr> </table> <h2 id="open">Open Source Studies</h2> <p>These studies typically fall into the 'how can we use Open Source technology' or 'can we use Open Source to reduce our cost/client cost base' or 'what are the implications of using Open Source in this context' categories.</p> <p>While all cases are unique the following table illustrates a typical work cycle:</p> <table class="t-m-s"> <tr class="g-h-n"> <td class="w-200">Phase</td> <td>Content</td> </tr> <tr > <td>Statement of Requirements</td> <td><b>Report</b>. Identifies and prioritizes requirements. Includes competitive review. Mandatory and Optional Requirements. Confirms understanding of all parties. Typically 20 - 25% of work content.</td> </tr> <tr > <td>Review Requirements</td> <td>First Review. Buy-in, revision cycle.</td> </tr> <tr > <td>Solution Matrix</td> <td>Functionality - Commercial Software, classic methodologies, Open Source methodologies. Typically 15 - 25% of work content.</td> </tr> <tr > <td>Preliminary Report</td> <td><b>Report</b>. Identifies, prioritizes and costs using off-the-shelf, classic and Open Source solutions. Support and cultural implications. Typically 15 - 20% of work content.</td> </tr> <tr > <td>Second Review</td> <td>A single/dual solution set will be identified which will guide the final phase work content.</td> </tr> <tr > <td>Open Source Report</td> <td><b>Report</b> Identify applications, projects, methodologies. Cultural implications, expertise profile, costs over 3 - 5 years. Typically 20 - 30% of work content.</td> </tr> <tr > <td>Third Review</td> <td>Review and presentation.</td> </tr> <tr > <td>Revision Cycle</td> <td>Comments, corrections and feedback. Typically 5 - 10% of work content</td> </tr> <tr > <td>Project/System Plan</td> <td><b>Report</b>. Follow up as required.</td> </tr> </table> <p>If you think we can help you please <a href="http://www.zytrax.com/Company/contacts.html" class="t-db">contact us by phone or fax</a> or by <a href="javascript:mailus('consulting','zytrax.com','Consulting')" class="t-db">email</a>. We look forward to working with you.</p> </div>  <div class="l-l">  <div class="n-l"> <p class="c-g t-b t-o m-h5 t-r">Tech Stuff</p>  <ul class="n-l1p"> <li class="n-l1p-e"> <a href="http://www.zytrax.com/tech" class="n-l-c">tech home</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="Digital Audio - primers, calculators, equalization, frequency tables, file formats, glossary - a mere splash in the ocean" href="http://www.zytrax.com/tech/audio/" class="n-l-c">audio stuff</a> <ul class="n-l2"> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/audio/sound.html" class="n-l-f">sound primer</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/audio/digital-sound.html" class="n-l-f">digital primer</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/audio/audio.html" class="n-l-f">note frequencies</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/audio/equalization.html" class="n-l-f">eq, meters & fft</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/audio/calculator.html" class="n-l-f">calculators</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/audio/formats.html" class="n-l-f">files & codecs</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/audio/glossary.html" class="n-l-f">glossary</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="Browser IDs, SSIs, Apache Configuration, regular expressions" href="http://www.zytrax.com/tech/web/" class="n-l-c">web stuff</a> <ul class="n-l2"> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/web/browser_ids.htm" class="n-l-f">browser ids</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/web/mobile_ids.html" class="n-l-f">mobile_ids</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/web/env_var.htm" class="n-l-f">apache env vars</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/web/ssi.htm" class="n-l-f">apache ssi</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/css/workarounds.html#popout" class="n-l-f">css popout menus</a></li> <li class="n-l2-e"><a title="most of those annoying HTML entity codes that we forget all the time" href="http://www.zytrax.com/tech/web/entities.html" class="n-l-f">html entities</a></li> <li class="n-l2-e"><a title="Decimal to Hexidecimal to Binary conversion - even Octal!" href="http://www.zytrax.com/tech/protocols/hex.html" class="n-l-f">dec > hex > bin</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a href="http://www.zytrax.com/tech/dom/" class="n-l-c">dom stuff</a><br> <ul class="n-l2"> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/dom/guide.html" class="n-l-f">dom guide</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/dom/w3c_dom.html" class="n-l-f">page explorer</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/dom/navigate.html" class="n-l-f">dom navigation</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="CSS is about a lot more than STYLE. Wheezes, table-less layouts, CSS pop-ups, CSS Shortcuts" href="http://www.zytrax.com/tech/css/" class="n-l-c">css stuff</a> <ul class="n-l2"> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/css/layoutnotes.html" class="n-l-f">css liquid design</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/css/workarounds.html#popout" class="n-l-f">css popout menus</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/css/workarounds.html" class="n-l-f">css notes</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/css/syntax.html" class="n-l-f">css syntax</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/css/shortcut.html" class="n-l-f">css short-forms</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="includes PHP, Ruby and some Java stuff (all about obscure solutions to stupid problems)" href="http://www.zytrax.com/tech/lang/" class="n-l-c">language stuff</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="quick overview 'cos we always forget - not that we ever knew much - now includes a nifty browser-based tester" href="http://www.zytrax.com/tech/web/regex.htm" class="n-l-c">regex stuff</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="rfc ordered by subject" href="http://www.zytrax.com/tech/rfcs/" class="n-l-c">rfc stuff</a> <ul class="n-l2"> <li title="dns rfcs" class="n-l2-e"><a href="http://www.zytrax.com/books/dns/apd/" class="n-l-f">dns rfcs</a></li> <li title="ldap rfcs" class="n-l2-e"><a href="http://www.zytrax.com/books/ldap/apc/" class="n-l-f">ldap rfcs</a></li> <li title="ipv6 rfcs" class="n-l2-e"><a href="http://www.zytrax.com/tech/protocols/ipv6.html#rfcs" class="n-l-f">ipv6 rfcs</a></li> <li title="tls/x.509 rfcs" class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/ssl.html#rfcs" class="n-l-f">tls/x.509 rfcs</a></li> <li title="some other subjects - we only update these when we are active - some lists are consequently long in the tooth" class="n-l2-e"><a href="http://www.zytrax.com/tech/rfcs" class="n-l-f">other rfcs</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="TCP/IP, IPv4, IPv6, ISDN, LAN, VoIP, ITU Multi-Media" href="http://www.zytrax.com/tech/protocols/" class="n-l-c">protocol stuff</a> <ul class="n-l2"> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/protocols/tcp.html" class="n-l-f">tcp, udp, icmp</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/protocols/ip-classes.html" class="n-l-f">ipv4</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/protocols/ipv6.html" class="n-l-f">ipv6</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/protocols/isdn/" class="n-l-f">isdn</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/ssl.html" class="n-l-f">ssl/tls/x.509</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/ss7/" class="n-l-f">ss7 &sigtran</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/protocols/lan/" class="n-l-f">802.3 lan</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="PC Parallel Ports, LAN wiring, RS232, Centronics, DIN" href="http://www.zytrax.com/tech/layer_1/" class="n-l-c">cable stuff</a> <ul class="n-l2"> <li title="10baseT, 100base-TX/T4, 1000baseT, 10Gbase-T, RJ45, STP" class="n-l2-e"><a href="http://www.zytrax.com/tech/layer_1/cables/tech_lan.htm" class="n-l-f">lan pinouts</a></li> <li title="mixing telephony and 802.3 LAN can be done on cat5/5e/6 wiring" class="n-l2-e"><a href="http://www.zytrax.com/tech/layer_1/mixed.html" class="n-l-f">lan & telephone</a></li> <li title="RS 232 pinouts on db9, db24 and T1" class="n-l2-e"><a href="http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm" class="n-l-f">rs232 pinouts</a></li> <li class="n-l2-e"><a href="http://www.zytrax.com/tech/layer_1/cables/heavy.htm" class="n-l-f">serial primer</a></li> <li title="USB 2.0, 3.0, 3.1 and 3.2 plus Firewire (i.Link) IEE 1394" class="n-l2-e"><a href="http://www.zytrax.com/tech/pc/serial.html" class="n-l-f">usb & firewire</a></li> <li title="some information about display and monitors/console interfaces inclusing VGA, HDMI, DVI and Thunderbolt" class="n-l2-e"><a href="http://www.zytrax.com/tech/pc/monitors.htm" class="n-l-f">displays</a></li> <li title="modular jack is the term we should use for those telephone and lan connectors" class="n-l2-e"><a href="http://www.zytrax.com/tech/layer_1/cables/cables_jacks.htm" class="n-l-f">modular jacks</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="10baseT, 100base-TX/T4, 1000baseT, 10Gbase-T, RJ45, STP" href="http://www.zytrax.com/tech/layer_1/cables/tech_lan.htm" class="n-l-c">lan wiring</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="DB9, DB25 pinouts, RJ45 serial, T1 and RS standards alphabet soup" href="http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm" class="n-l-c">rs232 wiring</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="Decimal to Hex and Binary conversion table - even a description of Octal!" href="http://www.zytrax.com/tech/protocols/hex.html" class="n-l-c">dec > hex > bin</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="character sets ain't as simple as they look" href="http://www.zytrax.com/tech/codes.htm" class="n-l-c">character sets</a> <ul class="n-l2"> <li title="pretty much all the characters sets in the known universe including utf-7, 8 and 16" class="n-l2-e"><a href="http://www.zytrax.com/tech/characters/" class="n-l-f">character sets</a></li> <li title="ascii variant of international reference alphabet 5 (ira5)" class="n-l2-e"><a href="http://www.zytrax.com/tech/codes.htm" class="n-l-f">ascii codes</a></li> <li title="international reference alphabet 5 (ascii's cousin)" class="n-l2-e"><a href="http://www.zytrax.com/tech/ia5.html" class="n-l-f">ia5 codes</a></li> <li title="all that ™ & © stuff" class="n-l2-e"><a href="http://www.zytrax.com/tech/web/entities.html" class="n-l-f">html entities</a></li> <li title="silly page containing a bunch of fonts in various sizes including your PCs defaults" class="n-l2-e"><a href="http://www.zytrax.com/tech/web/fonts.html" class="n-l-f">web fonts</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="The T series, E series and J series and then all that optical stuff (OC-12 etc.)" href="http://www.zytrax.com/tech/data_rates.htm" class="n-l-c">data rate stuff</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="Even us electronic guys gotta know how to screw it together, if you get our drift" href="http://www.zytrax.com/tech/mech/" class="n-l-c">mechanical stuff</a> <ul class="n-l2"> <li title="fastener (screw) head styles - surprising number of choices" class="n-l2-e"><a href="http://www.zytrax.com/tech/mech/heads.htm" class="n-l-f">head styles</a></li> <li title="threads for imperial (UNF, UNC) & metric sizes" class="n-l2-e"><a href="http://www.zytrax.com/tech/mech/threads.htm" class="n-l-f">threads</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="A collection of howtos including Samba3 as PDC, FreeBSD firewalls" href="http://www.zytrax.com/tech/howtos/" class="n-l-c">howto stuff</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="A collection of survival guides - quick overviews - to popular software" href="http://www.zytrax.com/tech/survival/" class="n-l-c">survival stuff</a> <ul class="n-l2"> <li title="tls and x.509 (ssl) certificates - warning: headache inducing stuff" class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/ssl.html" class="n-l-f">ssl/tls/x.509</a></li> <li title="Abstract Syntax Notation. 1 (ASN.!) and Distinguished Encoding Rules (DER) - not for the faint hearted. Pass the pain medication, we feel a headache coming on." class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/asn1.html" class="n-l-f">ASN.1 & DER</a></li> <li title="Kerberos is great - but tough, oh my, tough stuff" class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/kerberos.html" class="n-l-f">kerberos</a></li> <li title="We've used postfix for years but always forget which of the 27 million parameters to use" class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/postfix.html" class="n-l-f">postfix</a></li> <li title="Symetric, asymetric, MACs, hashes - eye watering stuff" class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/encryption.html" class="n-l-f">encryption</a></li> <li title="Just what time is it in Kuala Lumpur, and what's that got to do with cron?" class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/cron.html" class="t-db">cron</a></li> <li title="Gotta love wxWidgets - free, fantastic, flexible - but hard to see the wood for the trees sometimes" class="n-l2-e"><a href="http://www.zytrax.com/tech/survival/wxwidgets.html" class="n-l-f">wxWidgets</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="Our wireless overview, Calculators, Fresnel zones, links to 'heavy' stuff, some early 802.11 stuff (mostly wi-fi related)" href="http://www.zytrax.com/tech/wireless/" class="n-l-c">wireless stuff</a> <ul class="n-l2"> <li title="our irreverent general intro to wirelss - purist will not like this page" class="n-l2-e"><a href="http://www.zytrax.com/tech/wireless/intro.htm" class="n-l-f">overview</a></li> <li title="wireless calculators for system budgets, free-space loss, fresnel effects and a bunch of other stuff" class="n-l2-e"><a href="http://www.zytrax.com/tech/wireless/calc.htm" class="n-l-f">calculators</a></li> <li title="fresnel effect explanation - well, we can understand it" class="n-l2-e"><a href="http://www.zytrax.com/tech/wireless/fresnel.htm" class="n-l-f">fresnel effects</a></li> <li title="our outrageously biased description of frequency hopping versus direct sequence for spread spectrum" class="n-l2-e"><a href="http://www.zytrax.com/tech/wireless/fh_ds.htm" class="n-l-f">fh vs ds</a></li> <li title="some terminology covering 802 standards and modulation techniques" class="n-l2-e"><a href="http://www.zytrax.com/tech/wireless/soup.html" class="n-l-f">wireless soup</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="Pinouts - USB, DIN, Firewire, VGA, DVI, HDMI, DisplayPort and Thunderbolt, I/O interface speeds, Screen sizes including HD" href="http://www.zytrax.com/tech/pc/" class="n-l-c">pc stuff</a> <ul class="n-l2"> <li title="din and mini-din for older PCs" class="n-l2-e"><a href="http://www.zytrax.com/tech/pc/din.htm" class="n-l-f">din & mini-din</a></li> <li title="802.3 LAN stuff" class="n-l2-e"><a href="http://www.zytrax.com/tech/layer_1/cables/tech_lan.htm" class="n-l-f">802.3 lan</a></li> <li title="connection of monitors has changed over the years from clunky VGA to svelte HDMI - all the pinouts you could hope for" class="n-l2-e"><a href="http://www.zytrax.com/tech/pc/monitors.htm" class="n-l-f">monitor pinouts</a></li> <li title="serial (db9, db24) connections - slow but trusty" class="n-l2-e"><a href="http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm" class="n-l-f">serial stuff</a></li> <li title="usb pinouts and descriptions of power levels for usb 1, 2 and 3 - also includes firewire" class="n-l2-e"><a href="http://www.zytrax.com/tech/pc/serial.html" class="n-l-f">usb & firewire</a></li> <li title="pc interfaces are changing and getting faster - we can never keep up - list of interfaces and their speeds" class="n-l2-e"><a href="http://www.zytrax.com/tech/pc/interfaces.html" class="n-l-f">pc interfaces</a></li> <li title="we get confused about most things - just what is 1080p - pc and tv screen resolution table with some explanations" class="n-l2-e"><a href="http://www.zytrax.com/tech/pc/resolution.html" class="n-l-f">screen resolutions</a></li> </ul> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="Electronic glossary, some old experiments with 3.3/5V protection and early BGA designs" href="http://www.zytrax.com/tech/electronics/" class="n-l-c">electronic stuff</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="ragbag collection of links that we publish from time to time - maybe useful, maybe not" href="http://www.zytrax.com/links" class="n-l-c">tech links</a> </li> </ul> <ul class="n-l1p"> <li class="n-l1p-e"> <a title="Our DNS and LDAP for Rocket Scientists guides" href="http://www.zytrax.com/books" class="n-l-c">open guides</a> <ul class="n-l2"> <li title="dns for rocket scientists" class="n-l2-e"><a href="http://www.zytrax.com/books/dns/" class="n-l-f">dns guide</a></li> <li title="ldap for rocket scientists" class="n-l2-e"><a href="http://www.zytrax.com/books/ldap/" class="n-l-f">ldap guide</a></li> </ul> </li> </ul> <p class="t-r"> <a title="RSS (2.0) Feed - 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