Cisco 2950 - Catalyst Switch Dokumentacja Pobierz pdf (Strona 206)

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Catalyst 2950 and Catalyst 2955 Switch Command Reference

OL-10102-02

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

lre upbo

lre upbo

Use the lre upbo global configuration command to configure the reference TX power level on the

Long-Reach Ethernet (LRE) customer premises equipment (CPE) device. Use the no form of this

command to return t to the default setting.

lre upbo {noise-model | offset value}

no lre upbo {noise-model | offset value}

This command is available only on Catalyst 2950 LRE switches.

Syntax Description

Defaults The default is the ETSI-E noise model.

Command Modes Global configuration

Command History

Usage Guidelines The upstream power back-off mechanism allows for normalization of the upstream receive power levels

by requiring the CPE devices on shorter lines to transmit at a lower power level than the CPEs on longer

lines. You can change the upstream power back-off values by either selecting a standard noise model or

by setting an offset value for the default reference PSD.

Note The reference PSD number is based on an upstream carrier frequency of 4.8 MHz.

Table 2-4 shows the supported values for the noise models:

noise-model Specify the noise model. See Table 2-4 in the “Usage Guidelines” section for the

supported values. Values are not case sensitive.

offset value Specify the offset value. The range is 300 to 800.

The offset value is calculated with reference to –140 decibels referenced to 1

milliwatt per hertz (dBm/Hz). For example, if you require a reference power

spectral density (PSD) of –95.0 dBm/Hz, you need to enter an offset of 45.0

(–95.0 – [–140] = 45.0).

Note The LRE CPE PSD offset value is in 10*decibel (dB) (for example, 450

means 45.0 dB)

Release Modification

12.1(11)YJ4 This command was introduced.

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