Echelon Lumewave CRD 3000 Street Light Bridge - Manual (Page 47)

Street Light Bridge Integrator’s Guide 37
and the repeat count plus one should not exceed 12. The default is 6 (three
channels with one repeat). Thus, for three configured channels, you should
define no more than three repeats.
Signal Strength
The Segment Controller Power Line Repeating Analysis Web page shows
cumulative device signal strength and margin information. When a CRD 3000
Street Light Bridge module is used for power line repeating, the Web page shows
power line signal strength and margin information, which defines overall link
quality. Note that the cumulative reading is adversely affected by current or
past link failures, so that the report might show lower margin values than are
currently in effect for the channel. When the CRD 3000 Street Light Bridge
module is used for RF repeating (or both power line and RF repeating), you can
also retrieve RF signal strength and margin information.
You can also obtain on-demand measurements of signal strength and margin
from the Power Line Repeating Analysis Web page: Right-click the device and
select Online Measurement from the shortcut menu to display the Online
Measurement dialog.
See Analyzing a Power Line Repeating Network on page 54 for more information
about the Power Line Repeating Analysis Web page.
Defining the Media Access Protocol
Each CRD 3000 Street Light Bridge module has its media access protocol pre-
programmed in the factory. For European street lighting networks, the CRD
3000 Street Light Bridge module uses the comité européen de normalisation
electrotechnique 7 (CENELEC) EN50065-1 media access protocol for power line
networks. For other geographies, the CENELEC protocol is not used.
Important: All devices within the network must use the same media access
protocol, that is, all devices must use the CENELEC protocol or all devices must
not use the CENELEC protocol.
See Configuring the LonWorks Channel for Power Line Repeating on page 25 for
information about setting the media access protocol for the Segment Controller.
For luminaires, see the manufacture’s documentation for information about
selecting the media access protocol.
For device testing, or for power line networks that do not connect to public mains
power lines, you can decide to enable or disable the use of the CENELEC protocol
for a CRD 3000 Street Light Bridge module. From the Segment Controller, you
can change the value of the nciMediaAccess data point to specify the power line
media access protocol:
• 0 (default): The CRD 3000 Street Light Bridge module uses the media
access protocol setting defined in the firmware. That is, European
models use the CENELEC protocol, and other models do not.
• 1 (normal): The CRD 3000 Street Light Bridge module uses the
communication parameters of a PL-20N device. That is, the CENELEC
7 European Committee for Electrotechnical Standardization