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How To Identify, Verify, and Test an RJ45 Pinout

Ethernet cables, the 8-pin variety which are terminated by an RJ45-style connector, can come in just enough varieties to spread confusion. There are four basic types:

  • Rollover type which only looks like an Ethernet cable, but can be useful with Cisco equipment consoles. Usually light blue, sometimes with a 9-pin RS-232 connector on one end.
  • Straight through type, connecting to networking equipment such as routers, hubs, and switches, which is the predominant cable type now.
  • Crossover type which was necessary to connect computer to computer without any intervening network equipment. Becoming unnecessary.
  • A fourth type, which has to be mentioned — home made cables with nonstandard pinouts, often non-Ethernet. Hopefully, someone labeled them and identified their use.

Sorting Spares

The first place where you’ll have to figure out which cable is which is when you’re retrieving spare premade cables from your extras box. You should only save known good cables, but you can use a basic cable tester with remote to check out continuity and wiring. The Platinum Tools Lanseeker does an excellent job at this.

Common Cable Arrangements — TIA-568A/B

Look at the RJ45 connector on a cable, holding the flat underside toward you. On the left is pin 1. For Ethernet use, the straight through configuration is what you’re likely to see, in TIA-568B arrangement:

  1. Orange stripe
  2. Orange
  3. Green stripe
  4. Blue
  5. Blue stripe
  6. Green
  7. Brown stripe
  8. Brown

For the less common TIA-568A arrangement, pins one and two are Green stripe and Green, and 3 and 6 are Orange stripe and Orange. The connections are the same, but the colors are swapped. You can identify them that way, and suspect which one you have just by the pin 1 color.

Standard, Crossover, and Rollover

Computer equipment sends data using pins 1 and 2, and receives using 3 and 6. This is part of a convention which is used when these connectors and cables are used for Ethernet. For shorthand, you can call this MDI, or the Medium-Dependent Interface.

In the past, computer-to-computer “crossover” cables were needed when bypassing network equipment. As a variation, they were called MDI-X, for Medium-Dependent Interface Crossover. Network interfaces have advanced enough to detect cabling and switch pin usage as needed, so crossover cables are rarely used.

Crossovers not only exchange pins 1 and 3, 2 and 6 to exchange data and transmit, but also 4 and 5 cross and connect to 7 and 8, exchanging blue and brown pairs. Testers such as the Platinum Tools VDV MapMaster 3.0 can check all of the exchanges in a crossover cable quickly and simply, and identify common wiring problems in the cable such as miswires and split pairs. Of course, it can’t detect wrong wire colors!

For completeness, the rollover cable reverses every pin: 1 to 8, 2 to 7, etc., as if the wires were part of a ribbon cable which was reversed. If you have Cisco networking equipment nearby, you may have a few console cables in your cable box which are wired this way — beware!

Verification and Testing

Testing devices such as the Platinum Tools VDV MapMaster 3.0 can verify cable wiring, check for shorts and opens, and verify more exotic cable configurations such as mixed data and video. They can also map cabling using the remote module.



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Essential Install Live 2018

Visit EI Live! 2018

The EI Live! Show is the only dedicated custom install / home automation exhibition in the UK, catering for every home automation / smart building professional’s requirements and purposely designed to give you a truly rewarding and informative day. The 2018 show will be held on the 9th-10th May at Sandown Park, Surrey

Whether you are an established operator, are new to the industry or are looking to make the transition into including smart building products and services into your company’s offering, EI Live! has the people you need to speak to in order to make your business a success.

The show also offers insight from keynote speakers delivering a glimpse of the future of the industry, helping visitors to shape their business for success.

A visit to EI Live! will keep you fully briefed on the latest product and service innovations, fulfill all your sourcing needs and help grow your business productivity and profit, entry is totally free. Simply apply for your free ticket by clicking HERE to register online. If you register online and collect your Visitor Badge before 11am on the day, then you will be eligible for a FREE Bacon Sandwich! 

Come and chat to our friendly Sales Team and let them show you all of the latest AV solutions from our key AV manufacturer partners such as CYP, Penn Elcom, Polk Audio, Zyxel, Sanus, Syncbox, Platinum Tools, plus a whole lot more!

We are located near the main entrance at Stand 17 – Doors Open From 10:00AM – 4:00PM

For directions and parking information, please click HERE.

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Sign up NOW for our FREE CYP Training Academy

Within the CYP AV Academy facility in Middlesex, and at the TDI offices in Winchester, we provide tailored training and workshops that are suited to all levels of integrator and installer.

Our workshops create a friendly training environment where installers can confidently build their knowledge about the unique challenges faced when integrating AV within any installation environment.

There are two courses on offer, as follows:

Level 1 Course content includes:

  • Overview of the AV market place and look at the technological demands of newer technologies.
  • Understanding of HDMI, Category and Audio cable to overcome the barriers within an installation.
  • Experience CYP products by installing and functioning CYP devices, for example: establishing a simple point-to-point kit, working with a matrix to splitting and scaling signals to successfully placing an inline audio de-embedder.
  • Introduction to CYP’s XA range of installation support tools.
  • Understanding of new technological standards by experiencing a practical approach in regards to UHD, HDR, Chroma Sub-sampling and Dolby Atmos through A/B demonstrations to creating and solving issues so you will be able to best cater for your customer’s needs.
  • Understand how HDMI technology initialises and maintains an installation through TMDS, EDID, HDCP and HDBaseT protocols and technologies.
  • Experience practical troubleshooting, multi zone matrices setup, using scaling technology, HDBaseT applications, IP point-to-point and multi-point scenarios, and applying audio solutions.
  • Understanding how to control your system over RS-232, IR, WebGUI and Control 4.

Level 1 Training – Available Dates:
Tuesday 13th March 2018 – Complete
Thursday 7th June 2018
Tuesday 18th September 2018
Tuesday 20th November 2018


Level 2 Course content includes:

The CYP Level 2 course objective is aimed to support the intermediate to advanced installer looking to level up in terms of understanding the current industries technologies and how to apply and troubleshoot today’s installations using CYP products, and is ideally suited to those who have already completed the Level 1 Training Course.

You will:

  • Gain a hands on understanding of new technological standards by experiencing a practical approach in regards to UHD, HDR, Chroma Sub-sampling and Dolby Atmos through A/B demonstrations to creating and solving issues so you will be able to best cater for your customer’s needs.
  • Understand how HDMI technology initialises and maintains an installation through TMDS, EDID, HDCP and HDBaseT protocols and technologies.
  • An insight into HDMI over IP, Dolby Vision, and HDMI2.1 technologies.
  • Be able to understand how data is transferred between HDMI devices and apply best practice in terms of CAT cabling when working with CYP products.
  • Level up in terms of experiencing a first-hand practical CYP installation, from troubleshooting a multi zone matrices setup, using scaling technology to work with data heavy content to work across multiple sinks and HDBaseT, IP point-to-point and multi-point scenarios, setting up video walls and applying audio solutions to work alongside bespoke scenarios.
  • Understanding how to control your system over RS-232, IR, WebGUI and Control 4.
  • Be able to practically troubleshoot an installation using CYP’s XA range of testing tools.

Level 2 Training – Available Dates:
Thursday 26th April 2018 – NOW FULLY BOOKED
Tuesday 10th July 2018
Tuesday 16th October 2018


All CYP Training Courses begin at 10am and run until around 2:30pm.

TDI Tremiver Ltd, West Farm, Popham, Winchester, Hampshire, SO21 3BH.

To secure your place on any of our FREE training academies, please email links above or, alternatively, give us a call on 01256 397 770 to register.

Our close relationships with manufacturers enables us to offer bespoke training sessions. Give us a call to discuss your training requirements for course content, presentation style (classroom or hands on workshop), and location. We can tailor training to suit your needs.

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CYP 6×8 HDBaseT Matrix Units – Now Shipping

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We’re excited to announce that the long awaited CYP 6×8 HDBaseT Matrices are in stock and available for immediate shipping. CYP’s latest offering comprises of a Full HDBaseT Matrix capable of delivering 4K Video, HD Audio, PoH (Power over HDBaseT), LAN, and OAR (Optical Audio Return) up to 100m via CAT6 cable, whilst their PUV-662PL-4K22 HDBaseT LITE version delivers the same functionality (excluding LAN), but via a maximum of 60m of CAT6 cabling.

With on-board Audio matrix functions, including audio de-embedding for each HDBaseT zone, and routing of audio from any source to any output, these new CYP matrices offer the installer incredible flexibility when integrating into a multi-room installation.

Control is via manual selection buttons, IR, RS-232, Telnet or Web GUI. CYP provide FREE control drivers for all the major control systems.

To learn more and check the full matrix specifications, click HERE to be directed to the product information on our website.

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HOT OFF THE PRESS!! – Our NEW 2017/2018 Catalogue is Available Now

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We are very proud to announce the arrival of our NEW 2017/2018 Catalogue. The presses have been running furiously on the weeks running up to the annual ISE Show pilgrimage to Amsterdam and it’s now here ready for dispatch direct to your door!

This years’ catalogue brings a wealth of new solutions sourced using feedback from all of our valued customers, enabling us to focus our product offering specifically for your installation projects. We are excited to share the latest and greatest custom AV products with you.

New additions include an expanded range of 19″ Rack Solutions including a new Acoustic Rack Cabinet range, along with new Wall Mounted Rack Cabinets and Custom Shelves for Apple TV, Sonos, and SKY Q.

Our range of Triax solutions has also been expanded to include new Quad and Octo LNB’s, Multiswitches, and new additions to the range of Triax CCTV Equipment.

As demand for the latest 4K UHD video resolutions continue, we understand the importance of ensuring that the technology must be capable of delivering the highest level of performance whilst being robust enough to meet the demands of modern multi-room environments. CYP is a brand that have been at the forefront of this technology and have further expanded their product range with a selection of new Video Matrices, Audio Breakout devices, Scalers, Switchers, and Extenders.

One last highlight to mention is a completely new range of Fibre Optic solutions which incorporates bulk cable from Tru Cables, Fibre Patch Leads, Patch Panels, Breakout Boxes, Fast Fibre Terminations, and a full compliment of tools and cleaning products.

If you would like us to send you a hard copy of our NEW Catalogue, please email your contact information and company details to or call us on 01256 397 770, and we will send one to you without delay!

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CYP 4K HDBaseT LITE Matrix Kits in stock – Order today for next day shipping

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The NEW PUV-44XPL-4K22-KIT HDBaseT Matrix Kits from CYP are in stock and shipping for next day delivery. This matrix kit comprises four HDMI inputs to four HDBaseT Lite (60m) outputs, plus two independent HDMI outputs, and is supplied with four PUV-1210PL-RX Receivers.
With 4K, HDMI2.0, HDCP2.2 and HDR compatibility, this matrix kit provides installers with everything required to create a stunning 4K six zone multi-room system.

In addition, the PUV-44XPL-4K22-KIT enables audio signal management via the on-board audio matrix which allows users to de-embed audio from any source any HDBaseT zone.

Click HERE for product information or to order online, or call our friendly sales team on 01256 397 770 for further advice.

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NEW Bluetooth In-Line Wireless Audio Receiver from Switchcraft



The 318BT is a small, in-line wireless audio receiver that utilises Bluetooth 4.0 technology to stream audio from any Bluetooth enabled device. This AudioStix is phantom powered or via micro USB and features Switchcraft’s Balanced XLR Connector. This plug and play device is ideal for presentations, music rehearsals, Houses of Worship, providing XLR mixer consoles with Bluetooth connectivity.

Click HERE to learn more.

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HDBaseT Certified CAT6 Cable Now in Stock


With HDBaseT firmly established as the ‘go to’ technology for distributing AV, Control, Power (PoH), and LAN signals over CAT cable infrastructure, we are now offering a HDBaseT tested, approved, and certified CAT cable range to suit every installation environment. Choose from Samson CAT6 Solid Copper LSOH, Samson CAT6 Solid U/UTP External Grade, or TruHD CAT6 UTP LSHF. Click on the links above to find out more.