User's Manual

Chapter 2. Overview
2–4
10004880 Rev. D1
The ODU antennas are directional, with a beam width of 17° to 20° horizontally and verti-
cally depending on frequency. The width of this beam, combined with the width of the
base station antenna beam (90° or 60°), means that only rough alignment of the antenna
is needed for establishing a wireless link, though accurate alignment is important for
maximum signal quality.
Automatic Frequency Selection
The PacketWave 200 Series supports Automatic Frequency Selection (AFS), which helps
to ensure optimal performance in less-than-optimal conditions. A total of up to 20 fre-
quencies within the unit’s frequency band can be selected. With AFS, when interference
degrades performance on the primary frequency, the BSU will automatically shift the link
to a frequency providing satisfactory performance using QPSK.
Interface Box
The Interface Box is a small, free-standing unit which can be placed virtually anywhere
within the subscriber’s premises, subject to the following basic requirements:
• The unit must have access to AC power.
• The cable run to the Outdoor Unit can be up to 100 m (330 ft) with proper cable.
See Appendix E for cable details.
The Interface Box has two RJ-45 connectors for connecting to the Outdoor Unit (ODU) and
the hub, switch, or PC on subscriber’s LAN.
NOTE: These connectors are extensions of the Ethernet port on the ODU. The
Interface Box does not regenerate Ethernet signals as an Ethernet hub does. In
addition, the ODU port on the Interface Box provides power to the ODU via the
Ethernet cable connecting the units.
WARNING: There is DC power on the Interface Box’s ODU port. Connecting this port
to a PC or switch will cause permanent damage to the device.
The Interface Box comes with an external power supply and power cord that plugs into a
standard AC wall plug (120 or 220 volts).