User's Manual

Street Light Bridge Integrator’s Guide 13
PL-20 Channel
Device
Repeating
Device 1
Repeating
Device 2
Device
Repeating
Device 3
Target
Device
Repeating Chain
Hop Hop Hop
Figure 2. An Example Repeating Network
Each time that a message is repeated, on either channel type, is a
repeater hop .
A message within a street lighting network must be able to reach its destination
in eight or fewer hops. That is, there can be no more than eight repeater hops on
the path (power line, RF, or both) between the Segment Controller and the
luminaire for which a message is destined.
Figure 2 shows three hops between
the Segment Controller and the target luminaire.
From a L
ONWORKS network point of view, a Street Light Bridge module acts like
any other power line device: It has a number of network variables that are used
to provision the Street Light Bridge module and collect status and statistics.
Installation of a Street Light Bridge module is similar to installation for any
power line device. You must add it to the Segment Controller, either by
providing the Segment Controller with the Neuron ID for the Street Light Bridge
module, or by allowing the Segment Controller to automatically discover and
commission the Street Light Bridge module. In either case, power and RF
communication LEDs on the Street Light Bridge module provide a visual cue to
the installer that the Street Light Bridge module is operational. Additional
configuration of the Street Light Bridge module is generally not necessary, but
advanced configuration options are available.
Benefits of Managed Street Lighting
A managed street lighting network can offer many benefits, including:
• Electricity use can be reduced – in one installation, by as much as 45%,
which in turn resulted in a 30% reduction in streetlight electricity costs
(US$ 80 000 per year for this installation).