User's Manual

PMP 400/430 and PTP 200 Series Canopy User Guide
Supplement
Issue 4 0 – DRAFT 6 November 2009 Page 54 of 64
Figure 31: Dielectric Grease - Insert Ethernet Cable
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 or BH for additional
protection. In addition, a 600SS 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.
In all cases where Ethernet cables penetrate a building, home, or telecommunications hut, mount
a properly-grounded 600SS outside at the point of Ethernet cable building entry to protect
persons and property in the building.
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 alignment.
The Receive Power Level 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. The displayed Receive Power Level is not designed to be highly accurate
over time. The displayed Receive Power Level will vary with board-level temperature and may
vary from module to module even if the actual received power is not varying. Know the limitations
and use caution and judgment for any other use of Receive Power Level. Caution is advised
when using Receive Power Level for 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.