Following a joint Security Sub-Committee (SSC) and Working Group meeting on 26 February 2019 to discuss the results of the SSC Risk Assessment, it was confirmed that the removal of the 60-minute time-out would remove an important risk mitigation and would negatively impact on the security architecture of the HAN. We are now working with the Proposer to summarise the difficulties into a single problem statement and examine the issues via a new Draft Proposal.
What is the issue?
SMETS1 meters use the GB mobile telephone networks for their Wide Area Network (WAN) connections. SMETS2 meters are not yet deployed in significant numbers, but those in two out of three Communications Service Provider (CSP) regions will also use GB mobile telephone networks for WAN connections. Thus, WAN performance in SMETS1 deployment gives the best current indication of the likely SMETS2 WAN performance in two out of three CSP regions. Utilita have found over 9% of their SMETS1 meters continue to have poor WAN coverage following install. This means that the meter has WAN intermittently and the WAN connection, to material number of premises, is not sufficient quality to deliver configuration Commands in a sufficiently timely manner.
What is the solution?
This modification seeks to remove the 60 minute limit requirement that Communications Hub (CH) currently have to allow the Hand Held Terminal (HHT) to join the Home Area Network (HAN) after power on. This is to give Suppliers the option of providing Prepayment Meter Interface Devices (PPMIDs) to their Consumers, that can join a HAN without requiring a reliable Wide Area Network (WAN) connection or engineer intervention.
Who is impacted?
Other SEC Parties
SECMP0037/SECMP0038 February 2019 Working Group meeting summary
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