User's Manual

ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 3: OPERATION
Page 3-11
© 2005, ADC Telecommunications, Inc.
2.3 Reference Procedure: Enter Host Forward Attenuation
The HU internal forward path attenuator setting determines the maximum composite output
signal level at the RU antenna port. The appropriate attenuation value for any particular system
is based on the number of channels the system is transporting and the signal level of the
composite forward path signals input at the host units RF IN ports. By default, the forward path
attenuator is set to 31 dB.
The maximum output power is 38.1 dBm (6.5 Watts) for 800 MHz and 800/900 MHz SMR
systems and 38.3 dBm (6.7 Watts) for 1900 MHz systems. The total forward path gain that is
provided by the system (with host and remote forward attenuators set to 0 dB) is 77.5 dBm for
800/900 MHz SMR systems, 78.1 for 800 MHz systems, and 78.3 for 1900 MHz systems. For
800/900 MHz SMR systems, this procedure sets the attenuation for both FORWARD RF IN ports.
Use the following procedure to set the forward path attenuation to provide the maximum
composite output signal level:
1. Click on the HOST RF tab. The HOST RF display will open within the EMS main
window as shown in Figure 3-7.
Figure 3-7. Typical HOST RF Display
2. Click on the Host Fwd Att Edit button (see Figure 3-7). The Host Fwd Att pop-up screen
will open as shown in Figure 3-8.
3. Obtain the value of the total composite input signal level as determined in step 11 of
Section 2.1.
Click on Edit button
to open Host Fwd
Att pop-up screen