scope:

This module outlines the technical requirements for utilising the EULYNX Security Service Platform (SSP) Subsystem in the GB application, including its interfaces with other EULYNX subsystems. 

To fully understand these requirements, reading this module alongside NR/L2/SIG/19820/L01 and any relevant documentation published by the EULYNX Consortium is recommended.

This module applies to individuals and deployment projects introducing EULYNX SSP Subsystem for Network Rail managed infrastructure, where EULYNX interfaces are required.

It contains the Network Rail application requirements for the following EULYNX subsystems and interfaces:

a) SSP to Adjacent Interlocking Subsystem

b) SSP to Points Subsystem

c) SSP to Train Detection Subsystem

d) SSP to Electronic Interlocking Subsystem

e) SSP to Level Crossings Subsystem

f) SSP to Maintenance and Data Management Subsystem

In addition to the above EULYNX subsystems, the SSP subsystem will have the interface to the following.

a) Maintainer (for the access, maintenance and downloading of data of the connected EULYNX subsystems)

b) Security Service Interaction (for incident management)

Requirements in NR/L2/SIG/19820/L01 apply in addition to the above.

Figure 1 shows an overview of the EULYNX system and its associated subsystems and standard interfaces. The relevant Subsystem and interface to this document is shown in red.

Purpose 

This module details the EULYNX Security Service Platform (SSP) Subsystem. The SSP Subsystem implementation on Network Rails infrastructure will provide an additional security layer that monitors and logs cyber activities. It will provide the necessary authorisation to access the EULYNX system.