It is recommended that an organisation should choose between two to four local systems to be stratum-2 servers. The local server systems do not have to be reserved systems - they can do other work. However, they should be physically distributed around the organisation, so that they are not all on the same power supply or the same segment of a LAN. Each local server should be configured as a client of a Janet stratum-1 server, and as a peer to the other stratum-2s at the organisation.

Service updates

Planned maintenance on ntp0.ja.net and ntp2.ja.net

Please note that from time to time the National Physical Laboratory carries out scheduled maintenance on their MSF transmission equipment which will affect the Janet NTP servers ntp0.ja.net and ntp2.ja.net. Any known maintenance dates are provided below. There shouldn't be any interruptions to the service, but the servers ntp0 and ntp2 will be running at stratum-2 instead of stratum-1 during these maintenance periods.  For more information, please refer to the National Physical Laboratory website: http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-outages. The remaining Janet NTP servers should be available as normal unless other maintenance work is being carried out.