看駐波

一，需要開的參數(shù)，feature：

1，激活以下feature

VSWR

72 Licensing=1,OptionalFeatures=1,VswrSupervision=1 featureStateVswrSupervision 1 (ACTIVATED)
72 Licensing=1,OptionalFeatures=1,VswrSupervision=1 licenseStateVswrSupervision 1 (ENABLED)
72 Licensing=1,OptionalFeatures=1,VswrSupervision=1 serviceStateVswrSupervision 1 (OPERABLE)

2，設(shè)置參數(shù)：

vswrSupervisionActive 設(shè)置為true， 默認(rèn)為false

vswrSupervisionSensitivity 設(shè)置為100，意為門限1.5；默認(rèn)為1，門限3

對于RRUL81，請將port A, B, C, D, E, F, G, H設(shè)置為 true，請不要將port I 設(shè)置為true

對于RRUL62，請將port A, B 設(shè)置為 true，請不要將port R 設(shè)置為true

因?yàn)閷τ?/span>RRUL81，只有A到H才有VSWR監(jiān)控的功能，I口是沒有的

同樣對于RRUL62，只有AB口有VSWR監(jiān)控的功能，R口是沒有的

3， 參數(shù)含義

vswrSupervisionSensitivity = 1 { 1..100 }

The sensitivity of Voltage Standing Wave Ratio (VSWR) supervision.

A high value enables detection of a low reflected power (high return loss). A low value requires a high reflected power (low return loss) to cause an alarm.

VSWR = (1+10^(-RL/20))/(1-10^(-RL/20))

Where RL is Return Loss

The relation between the sensitivity and return loss on the RU is defined as:

RL = 6 + vswrSupervisionSensitivity [%]*0.08 dB

This gives VSWR=1.5 for 100% sensitivity and VSWR=3 for 1% sensitivity.

Unit: 1 %
Resolution: 1

Takes effect: Immediately.

It is possible to activate VSWR Antenna Supervision on all RF ports supporting measurements of reflected radio power in the RU. Supervision can be made on Radio Frequency (RF) ports used for downlink where power is transmitted. VSWR supervision is only possible on a Transmitter (TX) branch.

Supervision sensitivity can be set to reduce false alarms and to avoid reflected power becoming too low due to the attenuation in a long feeder cable.

Table 1 lists the VSWR values based on the following formula:

VSWR = (1+10^(-RL/20))/(1-10^(-RL/20)) 
Where RL is return loss.

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LTE交流資料(2).pdf