S 1.21 Sufficient dimensioning of lines

Initiation responsibility: Network planner; Head of Site/Bldg Technical Service; Head of IT Section

Implementation responsibility: Site/Bldg Technical Service

Sufficient dimensions must be specified for cable runs (e.g. floor ducts, window-sill ducts, raceways, pipe ducts in outside areas) so that, there will be sufficient scope for required extensions to the network. However to prevent cross-talk (mutual interference of cables), it may be advisable to provide for minimum spacing of cables.

If, for various reasons, it is not possible to provide routes with sufficient reserves right away, attention should at least be given to providing for any required extensions to be realised as regards routing. With regard to the design of wall breaches and ceiling breaches, this will obviate subsequent measures entailing high levels of noise, pollution and costs.

This measure can be replaced by the selection of other types of cables (S 2.20 Monitoring of existing lines and S 5.3 Selection of cables types suited in terms of communication technology). As compared to many small cables, use of a small number of multicore cables can save space. Cross-talk can be prevented by using shielded cables or fibre optics.

Additional controls:

• Has consideration been given to saving space and to preventing cross-talk by selecting other types of cables?