Avaya 882 사용자 설명서

Document No. 10-300077, Issue 2

8-3

Configuring Ports

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.

 lists the gigabit modules that do not support auto negotiation:

M5502-1000SX-F

M or earlier

M5502-1000LX-F

M or earlier

M5502-1000SLX-F

F or earlier

M5504-1000SX-F

H or earlier

M5504-1000LX-F

H or earlier

M5504-1000SLX-F

H or earlier