PMP 400 and PTP 200 Series
Canopy User Guide Supplement
Issue 3, January 2009
Page 35 of 45
5.2
INSTALLING AN SM OR BH WITH AN INTEGRATED ANTEANNA
Installing an SM or BH with an integrated antenna is very similar to installing standard Canopy
SMs as described in the
Canopy System Release 8 User Guide
, with the differences outlined
below.
Use an SMMB2 SM mounting bracket, not an SMMB1 typically used with standard Canopy SMs.
The PMP 400 Series SM or the PTP 200 Series BH is heavier and has a higher wind load than a
classic Canopy module, and so the stronger SMMB2 is required. The SMMB2 is the mounting
arm used with Canopy 900 MHz integrated APs and SMs, and used with reflectors.
Use dielectric grease on all connections and in all RJ-45 Ethernet connectors. (Dielectric grease
is generally available in the trade, and is specially formulated so as to be uniformly non-
conducting.) The best practice is to use enough grease to fill the RJ-45 female connector, and
then insert the RJ-45 male connector and push the grease further into the Canopy unit and
around the RJ-45 connector. Excess grease can be wiped over the connector area to provide
some resistance to water ingress around the connector.
The PMP 400 SM and PTP 200 BH have a ground/Protective Earth lug, just like the AP. Although
not as critical as in the case of the AP (where there is metal-to-metal connectivity through the
coax and antenna to ground), the lug can be used to ground the SM for additional protection.
Similarly, a 600SSC can be used within 3 ft (~1 m) of the SM or BH to provide additional
protection. Especially for a BH, or in cases where the SM is mounted high and is more exposed,
or in known difficult areas for lightning, consider using these two techniques to increase the
radio’s resistance to lightning.
PMP 400 and PTP 200 Series modules do not display a jitter value. Use “Received Power Level”
for aiming and then use Link Tests to confirm, similar to standard Canopy practice.
Be mindful when using the “Receive Power Level” that it is a relative, not absolute, value. The
"Receive Power Level" on a module is useful during installation to aid in aiming, where relative
values over a short period of time are of interest. However, the displayed “Receive Power Level”
is not designed to be highly accurate over time. Even if the actual received power is not varying,
the displayed "Receive Power Level" will vary with board-level temperature and may vary from
module to module. Know the limitations and use caution and judgment for any other use of
“Receive Power Levels”, including monitoring a link over time. deciding if the link is within
operating margins. deciding if a link is serviceable (link tests give a much better indication), or
comparing the link to other links.
The alignment headset will play a tone that varies in pitch (received power level), but not volume
(jitter), since PMP 400 and PTP 200 Series modules don’t calculate a jitter.
