User's Manual

36 Planning for the Street Lighting Solution
important, the devices can be in the unconfigured state before installation and be
configured during commissioning. In both cases, authentication is recommended.
Device Upgrade Planning
To allow your street lighting network to be upgraded over time, you can download
an updated Street Light Bridge application (as Echelon releases application
updates) over the power line network. The application download uses the
standard ISO/IEC 14908-1 download protocol.
The application download process includes the following steps:
• The Street Light Bridge detects the start of a download by a transition to
the applicationless state.
• The Segment Controller then downloads the application, which is stored
in onboard flash memory.
• After the download is complete, the Street Light Bridge firmware
computes a checksum of the downloaded application image to verify that
the download was successful. If the checksum fails, the Street Light
Bridge firmware sends a failure response to the “go unconfigured” request
that follows the computation of the checksum. In this case, you should
begin a new download for the application or contact Echelon Support.
• The Street Light Bridge firmware transfers the application image from
off-chip to on-chip flash.
• The Street Light Bridge resets and begins running the new application
image.
Note that although you can upgrade the Street Light Bridge application over the
network, you cannot upgrade the Street Light Bridge firmware over the network.
Network Management Planning
Planning for a street lighting network involves tasks for the luminaires, the
Street Light Bridge modules, and the Segment Controller. In addition, you need
to plan for both power line channels and RF channels for the Street Light Bridge
modules.
Although a Street Light Bridge module provides options for configuring the
network, many networks can operate successfully using default settings, without
additional configuration.
See Chapter
5, Managing a Street Lighting Network , on page 47, for information
about network planning for the Segment Controller.
Defining the Networking Channels
A Street Light Bridge module uses the Institute of Electrical and Electronics
Engineers (IEEE) wireless personal area network standard 802.15.4 for its radio
frequency (RF) communications. The standard defines up to 16 channels in the
2.4 GHz industrial, scientific and medical (ISM) radio band.
A Street Light Bridge module creates a virtual RF channel by using broadcast
messages, transmitting and receiving unfragmented packets. To define an RF