Telecommunications Distribution Methods Manual (TDMM), 14th Edition

The TDMM 15th Edition is now available for purchase. Click here to buy the latest edition!

The BICSI RCDD exam will be based on material from the TDMM 15th edition beginning 1 August 2024.  All RCDD Exam applications received by 30 June 2024 will be considered an application for the current exam based on the TDMM 14th edition.

All applications received after 1 July 2024 will be considered for the exam that aligns with the TDMM 15th edition.

No Instructor-Led courses based on the TDMM 14th edition will be available after 31 May 2024.


The Blueprint for Cabling Design!


The Telecommunications Distribution Methods Manual (TDMM) is BICSI’s flagship manual. Now in its 14th edition, it is the basis for the RCDD® exam and has become a true world resource in global best practices.

Since 1985 BICSI’s flagship manual has been the blueprint for cabling design. The 14th edition reflects the newest trends in ICT technologies, ensuring a project is designed based on the latest standards and best practices. The two-volume TDMM contains vital information on these aspects and even more.

The TDMM 14th is the foundation of ICT design for the next 20 years. From a new chapter detailing special design considerations, new sections such as disaster recovery and risk management, and updates to intelligent building design, 5G, DAS, WiFi-6, healthcare, PoE, OM5, data centers, wireless networks, and addressing the latest versions of electrical codes and standards, the TDMM 14th edition is sure to be the indispensable resource for modern cabling design. 

Spanning 2,200 pages, the TDMM is a valued reference for all ICT professionals designing digital infrastructure. It also acts as the basis for BICSI’s Registered Communications Distribution Designer® (RCDD), the gold-standard industry certification for ICT designers. Since its inception, the TDMM has helped to certify thousands of RCDDs.


Two-Time Award Winner!
Congratulations to the TDMM, 14th edition, for winning both the “Best in Show” and “Distinguished Technical Communication Award” by the Society for Technical Communication!

Best In Show
DTC Award

Publication Errata

  • TDMM Errata (PDF), 14th Edition, 2020 November Replacement Pages


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Replacement Pages (November 2020)
Errata_FINAL combined (PDF)

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