Avaya Cajun P882 User Manual page 181

Multiservice switch

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Table of Contents

Flow Control

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, Version v5.3.1

The LCW contains two fields (the selector field and the technology

ability field), which together serve to identify a device's capabilities.

It may seem that because the FLP and the normal link pulse use the

same interval at the same frequency, older devices may not be

compatible with auto-negotiation. This is, however, not the case.

For example, a 10Base-T device that does not have auto-negotiation

capabilities sees FLP bursts simply as a link test signal. A 10Base-T

device will respond to the FLP burst with its usual normal link pulse

signal. At the other end of the link, a 10/100-capable device will

recognize normal link pulse and choose 10Mbps mode operation.

Auto-negotiation attempts to find the greatest common

denominator for the two devices on the link in the following order

of preference:

1. 100Base-TX full-duplex

2. 100Base-T4

3. 100Base-TX

4. 10Base-T full-duplex

5. 10Base-T half-duplex

* Note: T4: 100 Mbps with 8B/6T coding scheme

Once the greatest common denominator of settings is determined,

each device equipped with auto-negotiation will configure itself

automatically. In certain cases where automatic configurations are

not desired, auto-negotiation provides a way for these settings to be

overridden manually.

* Note: Auto-negotiation should be disabled only on 50-series

modules that have remote fault detection enabled. Do

not disable Auto-negotiation on 80-Series gig links.

There are three flow control options on 10/100 Ethernet ports:

Enable with Aggressive Backoff

There are four flow control options on Gigabit Ethernet Ports.

Configuring Port Parameters

P550r P580 P880