
6
Installation
66
6.6 Establishing a Radio Link
The following is a description of the steps taken to establish a radio link between the two
units forming the bridge and align the units for the best signal strength.
6.6.1 Aligning the PTP 300 Series Bridge ODUs
The PTP 300 Series Bridge uses audible tones during installation to assist the installer with
alignment. The installer should adjust the alignment of the ODU in both azimuth and elevation
until highest pitch tone is achieved
.
The pitch of the alignment tone is proportional to the received power of the wireless signals.
The best results are usually achieved by making small incremental movement in angular
alignment.
The tones and their meanings are as follows:
Table 7 - Audio indications from the ODU
State Name
Tone
Description
State Description
Pitch Indication (Higher
pitch = higher power)
Free Channel
Search
Regular beep Executing band scan
N/A
Scanning Slow
broken
tone
Not demodulating the wanted
signal
Rx Power
Synchronized Fast
broken
tone
Demodulating the wanted
signal
Rx Power
Registered
Solid tone
Both Master and Slave units
exchanging Radio layer MAC
management messages
Rx Power
Alarm Fast
broken
dual tone
A fatal error has occurred.
The term ‘wanted signal’ refers to that of the peer unit being installed.
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