SEC v56.0 released to implement MP191

27 January 2022

An updated version of the SEC came into effect on 27 January 2022 to implement MP191 ‘Extending CHTS v1.0 & v1.1 IVP and MVP end dates’.

MP191 extends the Installation Validity Period (IVP) and Maintenance Validity Period (MVP) end dates for Communications Hub Technical Specifications (CHTS) v1.0 by 12 months. These dates have been changed to 31 January 2023 and 28 February 2023 respectively. For CHTS v1.1 the IVP and MVP end dates have been extended by two years to 30 April 2024 and 31 May 2024 respectively.


What parts of the SEC were affected?

The following parts of the SEC were affected:

  • SEC Schedule 11 ‘TS Applicability Tables’


Where can I access the redlining?

The redlined changes can be found on CodeWorks via the links below:


Our Document Log lists the versions of each SEC document now in effect following this release.

You can download the individual SEC documents from the SEC and Supporting Documents section of our website or via CodeWorks.


Where can I find further information?

Further information can be found on the MP191 page of our website. If you have any questions, you can call the SECAS Helpdesk at 020 7090 7755 or email