User Manual Chapter 3

Chapter 3: Installing the Hardware Infrastructure 3-3
General Layout Instructions
• The cable length between any two devices (hub to CBS or CBS to
CBS) cannot exceed 100 m (328 ft.).
• The maximum number of Ethernet levels beyond the primary CBS
is three (3).
• The maximum total cable length is as follows:
Cable Maximum Cable Length
Ethernet (primary CBS to last CBS in
chain)
300 m (984 ft.)
Power supply to last CBS in the chain 162 m (532 ft.)
• Use only NCR authorized communication cable.
• Communication cables must be secure and locked into their
connectors.
• The maximum number of CBSs per store is 40 except for model
7730-1013-9090 (Netherlands) which has a maximum of 12 CBSs
per store.
• If the communication cable is routed through an elevator shaft, it
must be in a conduit and the conduit must be connected to the
building ground.
• The minimum distance between a communication cable and a
fluorescent, neon, or incandescent light is 30 cm (12 in.).
Note: The minimum distance from red blown neon-type signs is 9.1 m
(30 ft.). See the “Neon Signs” section in Chapter 2 of the DecisioNet
Implementation Guide for information.
• All communication cable connections must be protected from
electrical and mechanical deterioration. The deterioration of
communication cable connections due to corrosion or electrolysis,
especially in a humid or corrosive atmosphere, may result in
electrical noise.