User's Manual

Street Light Bridge Integrator’s Guide 15
offering far longer operating life, have helped the city improve its closed-circuit
television (CCTV) image capturing system for increased public safety.
2
As stated by the city of Oslo, Norway, in November 2004, cities that take
advantage of today’s new technologies and solutions can reduce the overall costs
associated with streetlight networks by almost 50%, while increasing the quality
of service and safety. The city of Oslo and its energy supplier have shown that
deploying a solution based on electronic programmable and dimmable ballasts
that identify and communicate failures over power lines using a standardized
protocol can pay for itself immediately.
3
Street Lighting Solution Restrictions
The following restrictions apply to a street lighting network:
• Each Segment Controller supports up to a total of 200 devices (luminaires
plus Street Light Bridge modules).
• A Street Light Bridge module must be within 85 meters (275 feet) of
another Street Light Bridge module and should have direct line of sight
in all seasons.
• Each Segment Controller supports up to eight repeating hops to any
device (luminaire or Street Light Bridge module). However, during
installation, there can be no more than six hops (power line or RF)
between any luminaire and the Segment Controller. After installation, it
is possible to add hops (power line or RF), up to the maximum of eight,
between a luminaire and the Segment Controller.
2
Source: HBS Case Study, Netherfield Improved Lighting System, Milton Keynes Council, May
2007.
3
Source: Hafslund presentation, November 2004.