Description
The various protection, control and annunciator units of the SPACOM and REF, REM, REC and REX products are linked together via the SPA bus, which physically is composed of fiber-optic cables. Two types of fiber-optic cables are used, i.e. plastic core cables and glass-fiber core cables.
The plastic core and glass fiber cables have different optic specifications. Plastic-core cables are used for shorter distances, i.e. under 30 m, whereas glass-fiber cables can be used for distances up to 1000 m.
