ADC Telecommunications Inc. F0684-112 사용자 설명서

6-16

CONFIDENTIAL

The maximum output power per carrier (based on the number and type of RF carriers 
being transmitted) and the minimum acceptable received power at the wireless device 
(that is, the RSSI design goal) essentially establish the RF downlink budget and, con-
sequently, the maximum allowable path loss (APL) between the RAU’s antenna and 
the wireless device. Since in-building systems, such as the Fusion Wideband, are gen-
erally downlink-limited, this approach is applicable in the majority of deployments.

APL = (P – L

coax

 + G) – RSSI

(1)

where:

• APL = the maximum allowable path loss in dB

• P = the power per carrier transmitted by the RAU in dBm

• L

coax

 = the coaxial cable loss between the RAU and passive antenna in dB

• G = the gain of the passive antenna in dBi

Coaxial cable is used to connect the RAU to an antenna. Table 6-14 lists coaxial cable 
loss for various cable lengths.

You can calculate the distance, d, corresponding to the maximum allowable path loss 
using equations introduced in the following sections.

0.9 m (3 ft)

0.6

0.8

1.8 m (6 ft)

1.0

1.5

3.0 m (10 ft)

1.5

2.3

RAU

P = power per

Distance = d

G = Antenna Gain

RSSI = power at the
wireless device

carrier from the RAU

L

coax

 = Coaxial cable loss