Installation and User Manual
EtherHaul
1200™
EH-INST-02, Issue 4.0
Page 33
2.8.1
Setting the ODU to Alignment Mode
Switch the EtherHaul ODUs to Alignment Mode by inserting the DVM probes into the
DVM Probes at the AUX Interface. Following this action, the RF LED color indicator will
turn orange, indicating the ODU is in Alignment mode.
The ODU will remain in Alignment Mode even if the DVM probes are ejected , until the
ODU is rebooted.
2.8.2
Performing the Alignment
Note:
These instructions are for aligning a one-foot antenna. For instructions on aligning a
two-foot antenna, refer to
Appendix A: Install the ODU with Two Foot Antenna.
These instructions refer to Figure 2-1 EtherHaul 1200 Mounting Assembly
Components
1.
Verify that the ODU is in Alignment Mode. Refer to
Aligning the Antenna
on
page 32.
Coarse Alignment (Azimuth Only)
2.
Loosen the Unit Mounting Bolts (
) slightly in order to allow the ODU some
freedom of movement.
3.
Perform a coarse ODU alignment using a line-of-sight visual check with the
remote EtherHaul ODU. Lock the Unit Mounting Bolts (
) using the 13mm open
wrench.
4.
Repeat Steps
1 to
3 above on the remote ODU.
Fine Alignment
Note:
When aligning an antenna, the antenna in the remote node must remain completely
stationary. Fine alignment is performed first on the local antenna, and only
afterwards on the remote antenna.
The optimum alignment may require several adjustment iterations between the local
and remote antennas.
5.
Connect the DVM to the ODU by inserting both red and black probes into their
appropriate positions in the AUX port (
Figure
2-2)
.
Throughout the alignment procedure, you must compare the actual receive
signal strength indication (RSSI) to the expected RSSI that was calculated during
network link budget preparation (refer to
Preparing for Installation
on page 24).
Read the receive level (RSSI) using the DVM. The voltage reading will be
between 0 to
1V, indicating the RSSI in dBms. For example, a DVM reading of 0.45 V is equivalent to -
45 dBm.
