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3.1.7 Risks or vulnerabilities which need to be considered with shared infrastructure

A utility tunnel with multiple service providers requires:
 Easy access for repair or maintenance
 Access authorization, security (keys/locks) to minimize theft and wilful damage

 Wet and dry partitions to maintain continuity of service in event of flooding.
Allowing for changes in climate is increasingly being considered as a factor which affects the lifecycle
of an asset such as a railway or telecommunication facility [b‐8]. A risk assessment of built
infrastructure may be carried out according to guidelines in [b‐8].

Dual networks and/or multiple service providers should be considered as methods to maintain
service continuity against a single point of failure in telecommunications networks.

Example 1: Dual‐fiber entry to all buildings with more than 100 occupants.
Example 2: Both wired and wireless (cellular) services to be accessible in all buildings.

Figure 18 – Ensuring Telecommunications Service Continuity
[Source: ITU‐T, b‐9]

408 ITU‐T's Technical Reports and Specifications