User Manual

User Reference and Installation Manual 3-30
MDS 5800 II
3. Select the subcategory “Link Configuration.”
4. Select the operating mode. If the SDIDU
TM
has one modem installed and is connected to
one ODU, select standard. If the SDIDU
TM
has two modems installed and is connected to
two ODUs, select 1+1 diversity or 1+1 non-diversity for a protected link (as described in
section 2.10) or east-west for a 2+0 ring configuration (as described in section 2.11).
5. Follow the wizard located here to enter the rest of the required settings.
3.7.3.3 Configuring the SDIDU
TM
Site Attributes
Use the GUI to enter device information as follows:
1. In the navigation menu, select Administration, then Device Information, and then Device
Names.
2. Enter the Owner, Contact, Description, and Location. These values are not required for
operation, but will help keep a system organized.
3.7.4 ODU Antenna Alignment
To use the built-in tuning of the ODU antenna, a complete link is required, with both ends of the
link roughly pointed at each other, and transmitting.
Once the links are roughly pointed, place the local SDIDUTM in “ODU Alignment” mode. This
mode outputs 0 to +3 Volts on the RSSI (Receive Signal Strength Indication) BNC connector
seen on the ODU. This voltage is read on a voltmeter during alignment while the antenna is
adjusted for maximum voltage. The RSSI voltage is linearly calibrated from 2.5 Volts for
maximum RSL (received signal level) at –20 dBm to 0Volts for minimum RSL at -90 dBm. This
mapping characteristic is plotted below in Figure 3-17.
RSSI - Mapped Voltage Output
0
1
2
3
-100 -80 -60 -40 -20 0
Received Signal Level (dBm )
RSSI Output (V)
Figure 3-17. ODU RSSI Output vs. Received Signal.