Motorola MOTOWI 4 User Manual page 57

may be suffering from interference or a fast fading link. Installing in this situation may not give a
reliable link. The cause of the problem should be investigated.
For the ease of alignment, both Master and Slave units use the install tones in the same way but
with some small behavioral differences. This allows the installer to install the Slave unit first and
carry out the initial alignment with the Master unit if desired. However, due to the behavioral
differences of Master and Slave units, it is recommended that the Master unit is installed first and
the initial alignment carried out at the Slave unit.
Note also that there is a graphical installation screen
able using the web interface that displays the state of the link during the alignment process (up
green,Down, red).
The following behavior should be noted:
When first started up and from time to time, the Master unit will carry out a band scan to
determine which channels are not in use. During this time, between 10 and 15 seconds, the
Master unit will not transmit and as a consequence of this neither will the Slave unit. During
this time the installation tone on the master unit will drop back to the band scan state, and the
Slave unit will drop back to the Scanning state with the pitch of the tone set to the background
noise level. Alignment of the unit should cease during this time.
The master unit can take up to 60 seconds in 0-40km (0-25 miles) mode, 90 seconds in 0-130km
(0-81 miles) mode and 120 seconds in 0-200km (0-124 miles) mode to determine the range of
the link being installed
the link has been established. The Master unit will only move to the Synchronized state when
the range of the link has been established.
If, at the end of the ranging period, the Registered state is not achieved due to interference
or other reasons, the Master unit will retry twice more on the same channel before moving to
another available channel. Should this occur it might take a number of minutes to establish a
link in the Registered state.
The Slave unit does not have a ranging process. The slave unit will change to the Synchronized
state as soon as the wanted signal is demodulated.
When the alignment process is complete the installer MUST REMEMBER TO DISARM
UNITS in the link as described in
Turn off the audible alignment aid
Enable Adaptive Modulation
Fully enable Advanced Spectrum Management with i-DFS
Clear unwanted installation information from the various systems statistics
Store the link range for fast link acquisition on link drop
Enable higher data rates
7
If the unit is operating where mandatory radar avoidance algorithms are implemented the ranging behavior for the
PTP 500 Series Bridge may be affected. The Master has to monitor the initially chosen channel for 60 seconds to
make sure it is clear of radar signals before transmitting. If a radar is detected during any of the installation phases
a further compulsory 60 seconds channel scan will take place as the master unit attempts to locate a new channel
that is free of radar interference.
8
After 24 hours, the units will be disarmed automatically provided that they are armed and that the link is UP.
Installation
7
. The Master unit will remain in the Scanning state until the range of
Section 8.3.4
(Section 8.3.4.4
57
(Section 8.3.5
"Install Pages". This is necessary in order to:
"Disarm")
"Graphical Install") avail-
8
BOTH