User Manual

VoiceXtender Modem Installer’s Guide
Installation and Setup
Rev. A - 8/97 3-11
NOTE DC power supplies are available from Cylink or Cylink distributors.
System Startup
After configuring and cabling the modems (master and slave), the green
POWER indicator on the front of the modem will be illuminated. If the
POWER indicator is not on, ensure that the connection is secure.
If the modems are communicating, the SYNC indicator on the front of each
modem will be illuminated. If the SYNC indicator is not illuminated, it is
possible that the fade margin was not accurately determined or the antennas
are not properly aligned. See the following section about properly aligning the
antennas.
Directional Antenna Alignment
To ensure that the modems are operating optimally when directional antennas
are used, it is important that the antennas are aligned properly. Coarsely align
the antenna to ensure that you are on the peak of the main lobe, then fine tune
the alignment. In addition to physically adjusting the direction of the antenna,
you might need to adjust the transmit power level, using the configuration
switches on the unit.
To align the antenna, use the following two procedures and refer to the flow
chart shown in Figure 3-6.
Procedures to Coarsely Align the Antenna
The first step in the antenna alignment process is to coarsely align the antenna
on each unit using the following steps:
1. With the configuration switch located on the rear of the modem, set the
Transmit Level to full power on both modems.
See the Switch Configuration section in this chapter for more details.
2. Move each antenna until the SYNC indicator on the modem is illuminated.
When the SYNC indicator is illuminated, it indicates that the link is
established; however, the antenna can be aligned on a side lobe rather than
the main lobe.