IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Communications Remarks
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IT-Baseline Protection Manual: Oktober 2000
10Base-T TP 100 m
10Base-FL monomode FO 2 km
10Base-FL single-mode FO 5 km
Fast Ethernet 100Base-TX TP 100 m
100Base-FX FO 412 m
FDDI Monomode FO 2 km
Single-mode FO 60 km
CDDI TP 100 m
It should be noted that the lengths stated above are the maximum lengths in
each case. This is often made up of the installation cable itself and the
connecting cables (patch cables). For 10Base-T, for example, the length of the
installation cable should therefore not exceed 90 m so as to leave sufficient
length for patch cables. With some procedures (such as 100Base-FX) the
length is reduced by the use of repeaters, depending also on the type of
repeaters.
When installing new networks it makes sense to use optical fibres in the
primary and secondary areas because they will be able to satisfy future
requirements thanks to the high available bandwidth. For the tertiary area it
needs to be examined whether the use of TP cables or optical fibres is possible
and/or necessary according to technical and security criteria, and also whether
it is justifiable from the economic standpoint (cf. also S 5.2 Selection of an
appropriate network topography).