User's Guide

InterReach Fusion Installation, Operation, and Reference Manual 6-1
D-620610-0-20 Rev B CONFIDENTIAL
SECTION 6 Designing a Fusion Solution
This section contains the following subsections:
• Section 6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
• Section 6.2 Downlink RSSI Design Goal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
• Section 6.3 Maximum Output Power per Carrier . . . . . . . . . . . . . . . . . . . . . . 6-4
• Section 6.4 System Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
• Section 6.5 Estimating RF Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
• Section 6.6 Link Budget Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25
• Section 6.7 Optical Power Budget . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37
• Section 6.8 Connecting a Main Hub to a Base Station . . . . . . . . . . . . . . . . . 6-38
6.1 Overview
Designing a Fusion solution is a matter of determining coverage and capacity needs.
This requires the following steps:
1. Determine the wireless service provider’s requirements: Refer to Section 6.2,
“Downlink RSSI Design Goal,” on page 6-3.
The following information is typically provided by the service provider:
• Frequency (for example, 1900 MHz)
• Band (for example, “A-F” band in the PCS spectrum)
• Protocol (for example, CDMA, GSM, 1xRTT, GPRS, and so on)
• Number of sectors and peak capacity per sector (translates to the number of RF
carriers that the system will have to transmit)
• Downlink RSSI design goal (RSSI, received signal strength at the wireless
handset, for example, –85 dBm)