Multipoint Wireless Support for the Cisco uBR7200 Series Universal Broadband Router

radio cable-loss

Usage Guidelines

The following table provides an example of estimated cable, connector, and equipment loss for a typical

 

 

 

installation.

 

 

 

Table 1

Estimated Cable Loss Between Wireless Modem Card and Transverter

 

 

 

 

 

 

 

 

 

 

 

 

Wireless Modem Card to Power

Power Feed Panel to Primary

Primary Lightning Suppresion

Item

 

 

 

Feed Panel

 

Lightning Supression

to Transverter

 

 

 

 

 

 

Cable length (feet)

 

4

 

250

50

 

 

 

 

 

 

 

 

Cable type

 

 

 

RG 142

 

LMR400

LMR400

 

 

 

 

 

 

Loss per 100 feet

 

8 dB at 400 MHz

 

2.7 dB at 400 MHz

2.7 dB at 400 MHz

(decibel)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connectors

 

 

 

2

 

2

2

 

 

 

 

 

 

Loss per connector

 

.25 dB

 

.25 dB

.25 dB

 

 

 

 

 

Equipment loss

 

1.2 dB (power feed panel)

0.2 dB (Lightning Supression)

--

 

 

 

 

 

 

Loss per segment

 

2.02 dB

 

7.45 dB

1.85 dB

(decibel)

 

 

 

 

 

 

 

 

 

 

 

 

 

Total loss = 11.32 dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Examples

 

 

In the following example, the headend Tx cable loss was measured to be 11 dB, and the headend Rx

 

 

 

cable-loss was measured to be 12 dB:

 

 

 

 

 

UBR04(config-if)#radio cable-loss 1 11 12

 

 

 

 

Headend ODU Tx Attenuation Setting = 15 dB - 11 dB = 4 dB

 

 

 

 

Headend IDU Tx Attenuation Setting = 13 dB - 12 dB = 1 dB

 

 

 

 

 

 

 

Related Commands

 

Command

Description

 

 

 

 

 

 

 

 

 

 

show

Displays the current configuration settings, including cable loss.

 

 

 

running-configuration

 

 

 

 

 

 

interface radio

 

 

 

 

 

 

 

 

 

 

 

Cisco IOS Release 12.1(5)XM

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Pengo Computer Accessories UBR7200 manual Installation, Feed Panel Lightning Supression To Transverter, Command