# Commission Decision of 16 March 2007 laying down the network requirements for the Schengen Information System II (1st pillar) (notified under document number C(2007) 845) (Only the Bulgarian, Czech, Dutch, German, Estonian, Finnish, French, Greek, Hungarian, Italian, Latvian, Lithuanian, Maltese, Polish, Portuguese, Romanian, Slovak, Slovenian, Spanish, and Swedish text is authentic) (2007/170/EC), Division 4.7: Resiliency

Extent: E+W+S+N.I.

The CS-SIS has been designed with high availability as a requirement. For this reason the system have integrated resiliency against component malfunctions by duplicating all equipment.
The components of the Communication Infrastructure must also be resilient against component failure. For the Communication Infrastructure, it means that the following components must be resilient:
backbone network
routing devices
points of presence
local loop connections (including physically redundant cabling)
security devices (crypto devices, firewalls, etc.)
all generic services (DNS, NTP, etc.)
LNI/BLNI.
The failover mechanisms for all network equipment should occur without any manual intervention.

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Source: https://www.legislation.gov.uk/eudn/2007/170/annex/division/4/division/4.7 (the official version)
Page: https://openlegislation.uk/eu-decision-2007-170/annex/division-4/division-4.7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.