Echelon Lumewave CRD 3000 Street Light Bridge - Manual (Page 46)

36 Planning for the Street Lighting Solution
• 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 CRD
3000 Street Light Bridge modules, and the Segment Controller. In addition, you
need to plan for both power line channels and RF channels for the CRD 3000
Street Light Bridge modules.
Although a CRD 3000 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 CRD 3000 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 CRD 3000 Street Light Bridge module creates a set of virtual RF channels by
using broadcast messages, transmitting and receiving unfragmented packets. To
define an RF channel, all the CRD 3000 Street Light Bridge modules within a
street lighting network coordinate which frequencies they use. Multiple CRD
3000 Street Light Bridge modules can use a single set of RF channels.
A CRD 3000 Street Light Bridge module identifies its channels through a pair of
data points (nciPriChs and nciSecChs), which define three channels in the
range 11..26, with default values for the primary channel of 25, 20, and 15, and
default values for the secondary channel of 11, 17, and 26. The two data points
represent the primary (normal) and secondary (alternate) LonTalk ® (ISO/IEC
14908-3) path, which allow the transceiver to define a primary and a secondary
channel for communications. If communications fail on the primary channel, the
CRD 3000 Street Light Bridge module can switch to the secondary channel. The
secondary channel is used when the Segment Controller requests that the
alternate path be used.
Important: For all CRD 3000 Street Light Bridge modules within the street
lighting network, the set of defined primary channels must match for all CRD
3000 Street Light Bridge modules, and the set of defined secondary channels
must match for all CRD 3000 Street Light Bridge modules. In general, the
primary and secondary channels should not be the same.
A CRD 3000 Street Light Bridge module broadcasts a packet once, followed by a
number of repeats (the default number is 1; you can modify the nciPriRpt and
nciSecRpt data points to specify additional repeats) on each of the configured
RF channels. For each path, the product of the number of configured channels