Network management planning, Defining the networking channels – Echelon Lumewave CRD 3000 Street Light Bridge User Manual

Page 46

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