Siemens SIMATIC TI500 Bedienungsanleitung PDF herunterladen (Seite 27)

Network Installation

2-11

TIWAY I Gateway User Manual

Some

disadvantages are the following.

•

Is is impractical for buildings without drop ceilings

• W

orking in high ceilings can be hazardous

•

Ceilings often collect dust and other debris

Surface

ducting

— Surface ducting for network cabling is usually

installed along the baseboards or is attached to walls at desktop height.

While surface ducting ordinarily protects cables from both physical and EMI

effects, it may also require that network computing devices be positioned

near a wall.

Aside from physical obstructions such as posts, walls, and partitions,

electrical interference should also be avoided. Some sources of interference

are the following.

•

Power distribution mains

•

Arcing motors

•

Fluorescent lighting

• Teletypes

•

Undesired signal transfer (cross-talk) between adjacent circuits

•

Poor cable-to-equipment impedance matching

In general, network cabling should never come into direct contact with any

electrical conductor

. If cabling is installed inside a conduit, the conduit

should be grounded in accordance with applicable electrical codes. Keep a

minimum of three feet of distance between all network cabling and the

following sources of noise.

•

Power lines

• Generators

•

Electric motors

•

Electric welders

• Transformers •

Induction furnaces and heaters

• Rectifiers •

All sources of microwave radiation

Obstructions

Noise A

voidance

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