XRN 5535A
Processing of CSS Switch Requests Received in ‘Time Period 5’

Last Updated	28 Mar 2023	Status	Implemented
Release Type	Ad-hoc	Implementation Date	06 Mar 2023
Proposer	Xoserve	Impacted DSC service area	Service Area 3 (Current Apr 21) Manage updates to customer portfolio
Customer Change Team Leader	uklink@xoserve.com	Impacted DSC service area

Summary

The circumstances where the GRDA receives messages after 02:59:59 should be exceptionally rare – i.e. systems have failed in normal operation; the resilience built into the system to maintain contiguous service have failed such that they cannot be restored within the 1 hour RTO; Target DR Recovery has been missed AND Maximum DR Recovery has also been missed.

Since this change is required in such rare circumstances this change needs to identify a solution that is cost effective to implement so that these Registrations can be recorded in UK Link systems.

The analysis needs to engage stakeholders to determine the risk / impact of the solution to all industry participants.

This change should focus on short term options for implementation. It is not proposed to initiate a large investment given the extremely low likelihood of this scenario occurring.

Impacted Customer Types

IGT
NGT
Shipper
DNO

Documents

Document title	Comment	Last updated	CHMC outcome
Change Proposal	Approved	30/01/2023	Approved at ChMC on 13/07/2022
Initial Review	Stage not required	N/A	N/A
DSG Discussion	N/A	01/03/2023	N/A
High Level Solution Options	Stage not required	N/A	N/A
Solution Review	Stage not required	N/A	N/A
Detailed Design	3139.5 - VO - PO	13/03/2023	Approved at ChMC 08/03/2023
Evaluation Quotation Reports (EQR)	Stage not required	N/A	N/A
Business Evaluation Reports (BER)	Approved	13/02/2023	Approved at ChMC 08/02/2023
Change Completion Reports (CCR)	Stage not yet reached	N/A	N/A

Timeline

Initial Review

Change Proposal Raised 01/07/22

Status Awaiting approval at ChMC

Capture

Approved into Capture 13/07/22

Status ChMC approved into Capture

Solution Consultation

Expected: 00/00/00

Status Stage not required

Awaiting Delivery

Expected: 00/00/00

Status Stage not required

In Delivery

BER approved 08/02/23

Status Detailed Design Change Pack approved at ChMC 08/03/2023

Implemented

Expected: 06/03/23

Status Successfully Implemented

Contact the Change Team

Need to get in touch with a member of the Change Team?

You can email us at: uklink@xoserve.com and we'll get back on the same day between the hours of 9:00am to 4:30pm.

XRN 5535AProcessing of CSS Switch Requests Received in ‘Time Period 5’