Avaya P580 - Manual (Page 183)

Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1 5-3
Configuring Port Parameters
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.
* Notes: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.
Flow Control
There are three flow control options on 10/100 Ethernet ports:
■
Disable
■
Enable
■
Enable with Aggressive Backoff