Installation Manual Part 2

Company Proprietary
Adaptive Broadband
U-NII Product Installation Manual 05/29/2001
9-2
Attention! If the yellow LED is on, this indicates that power is being supplied to the unit.
If not, check the connections.
9.4 Configure The IP Address
1. Switch on the Test PC.
2. Configure the Test PC to use the recommended IP address supplied by your system provider
or installer (example: 192.168.3.1).
3. Configure the Test PC to use the recommended netmask supplied by your system provider or
installer.
Attention! These steps make sure that the test PC is on the same subnet as the AB-Access
System. The last number in the Test PC’s IP address must be different from
the last number in the IP address of the AB-Access System (see below).
9.5 Using the RSSI Interface for RF Alignment
One of more challenging aspects to RF systems is proper alignment of antennas. With distances
up to 3 miles, it can be very difficult to align an SU with an AP. To solve this problem, the RF
signal strength and packet error rate can be measured to provide feedback, which can be used to
properly align a unit. This information is typically called the Receive Signal Strength Indicator
(RSSI).
While the RSSI interface is always present, it is primarily designed for use with SUs being
initially deployed. To use the RSSI interface, the SU should be set to “installation” mode when
upgraded in the Operation Center. Installation mode is used for SUs to be used in a dynamic
registration (EMS) environment. When an SU is in installation mode, the SU will wait for the
installer to align the antenna and will register only after the installer has initiated the registration
sequence via the browser interface. This is slightly different from registration mode, where the
SU automatically registers with the strongest AP immediately after booting.
For realignment, the SU must be set back into Installation mode from the hmm sub process by
issuing the command:
hmm> system mode installation
While the RSSI interface is always present, when not set to Installation mode, the SU will not
attempt registration once the proper channel is selected.
The RSSI application can also be effective in Static or Registration mode in analyzing the RF
landscape with respect to other AB-Access components. Using the RSSI interface, the network
manager can get readings on RSSI and Packet Error Rates in a convenient display. The only
difference is the SU to register in these modes. Registration via the RSSI interface only occurs
when the unit is in Installation mode.