Echelon Lumewave CRD 3000 Street Light Bridge - Manual (Page 28)

18 Installation for the Street Lighting Solution
t
[ms]
Excellent
Good
Fair
Poor
Naught
0 150 500 850 1000
One period (1000ms)
Figure 4. RF Signal Quality as Represented by the RF Signal LED
The flashing pattern of the RF signal LED allows the installer to confirm good
RF communications with nearby CRD 3000 Street Light Bridge modules without
having to return to the Segment Controller. Echelon does not recommend using
a link that indicates poor or no margin; such a link is likely to have poor
reliability.
However, the RF communications indicated by the LED could possibly be with an
unrelated street lighting network that uses a different Segment Controller than
the network into which you installed the CRD 3000 Street Light Bridge module.
In addition, the quality of the RF communications link has some dependency on
ambient temperature conditions, so you should verify RF communications at
extreme temperatures as well as at nominal temperatures.
By default, both LEDs turn off after one hour. You can modify this timeout value
by updating the nciLedTimeout data point. Setting this data point to zero
disables LED shutoff (that is, the LEDs remain on or flashing indefinitely). See
Appendix A, Interoperable Interface for the Street Light Bridge, on page 103, for
more information about this and other data points that comprise the Street Light
Bridge interoperable interface.
Example Installations
You can install CRD 3000 Street Light Bridge modules in almost any
configuration to provide power line and radio frequency communications for
street lights within a street lighting solution.
In the figures, the street lights in the figures are shown in straight lines, but they
could be in any physical configuration. Also, the service distribution
transformers are shown installed on utility poles, but the transformers could be
pad mounted.
Basic Installation
Figure 5 and Figure 6 on page 19 shows a basic installation with a Segment
Controller and two CRD 3000 Street Light Bridge modules. The Segment
Controller uses the power line communications channel for the nearest set of
luminaires, and two CRD 3000 Street Light Bridge modules provide the
communications bridge between the two service distribution transformers.