Specifications

Thin-ethernet-cable networks CP143 H1 / TCP/IP manual
3-6 Rev. 00/07
3.2.2 Regulations and specifications
Certain basic regulations must be observed when planning or installing a network:
• The cabling of a network consists of a number of segments. Each segment must be terminated
with its characteristic impedance (terminator) of 50 Ω.
• According to the ISO 8802.3 specification the maximum length of an individual segment is
185 m.
• Wherever possible, the network should consist a homogeneous segments of coaxial cable as
every connector introduces losses. When it becomes necessary to extend existing segments of
coaxial cable you should always use preconfigured cables. Please note that the maximum length
of a segment may not exceed 185 m.
• The screen of the coaxial cable may only be grounded at a single point on the entire cable. This
point must posses a defined low impedance. All other connectors and terminators must be
insulated from ground.
• Any two stations on the network may only have a single connection between them. Where
multiple physical paths exist the resulting interference will be interpreted as a signal and cause
collisions which may abort the data transfer.
• Single drop-cables are not permitted.