User's Manual

5–21
10004880 Rev. D1
Chapter 5. The PacketWave AIM
• Incorrect frequency entered — Verify that the frequency information specified for
the SU matches the BSU. (Typically, the AIM will have hung at the “searching for
sync” or “link establishment” state.)
• Incorrect BSU ID entered — Verify the BSU ID, which is case-sensitive and must
match the ID as entered on the BSU.
• Incorrect WSS port number entered — Verify that the SU is in the correct sector and
that the correct port number is being used.
• Cable problems — Ensure that the Cat 5 cable between the Interface Box and the
Outdoor Unit is properly and securely connected; that the cable meets the require-
ments given in this manual; and that the cable does not exceed 100 m (330 ft) in
length if Cat 5E, or 50 m (165 ft) if Cat 5. (Typically, the AIM will have hung at the
“searching for sync” or “link establishment” state.)
• Incorrect antenna alignment — Try re-running the AIM and aligning the antenna
again, making sure to secure the Outdoor Unit in the position where the strongest
signal is being received. (Typically, the AIM will have hung at the “searching for
sync” or “link establishment” state.)
• BSU wireless failure — Confirm that the BSU’s wireless interface to the SU is oper-
ating correctly. (Typically, the AIM will have hung at the “searching for sync” or “link
establishment” state.)
• DHCP failure — If the Installation Manager hangs in the “DHCP request sent” state,
the communication link has been successfully established but there has been a
problem with DHCP or configuration downloading. Ensure that:
- The DHCP server has a proper entry for the SU’s MAC address.
- The DHCP server has an established route to the SU.
- The TFTP server has a valid configuration file for the SU.
• Noisy or bad communication link — If the throughput test is inordinately slow, the
communication link’s error rate may make it inappropriate to put the SU into ser-
vice. Experience has shown that the test can take up to ten minutes and still be
completed without errors. If the throughput rate is not appropriate, try aligning the
antenna in its current location or relocating the antenna. If this does not solve the
problem, perhaps the sensitivity of the antenna at the base station should be
adjusted (depending on performance of other SUs in the sector).
• Signal too strong — If the base station antenna is adjusted for communication with
distant SUs, an SU near the base station may not be able to turn its transmit power
low enough to avoid overdriving its signal to the base station. (Typically, the AIM
will have hung at the “searching for sync” or “link establishment” state.) If this
occurs, align the subscriber antenna for the maximum signal; then adjust the
antenna alignment upward (“detuning” the antenna to decrease transmit power),
keeping the signal strength below -40 dBm.
NOTE: Please be sure to have the correct frequency, BSU ID, sector number, and
channel width when running AIM. Without these correct entries, the unit will not be
able to synchronize with the Base Station and you will not be able to align the
antenna. The lack of signal will appear the same as a non-covered area. Either use a