METRObility Optical Systems Delta Class Installation And User Manual page 15

LLCF with Auto-Negotiation
To prevent synchronization problems, we recommend that
IMPORTANT:
you do not enable both LLCF and auto-negotiation at the same time on
the both the local and remote "twister". Disable one of the functions on
either unit to ensure quick link establishment.
When LLCF and auto-negotiation (AN) are enabled simultaneously on
both the local and remote units, as shown in the following diagram, it
may take a few seconds for the "twister" units to establish link.
remote
local
"twister"
"twister"
LLCF is ON LLCF is ON
AN is ON
AN is ON
AN is ON
AN is ON
Copper Fiber Copper
Cable
Cable Cable
LED lit = established link LED unlit = no link
As connections are created, the "twister" units may enter a situation in
which the LLCF and auto-negotiation functions become synchronized but
slightly out of phase. This will cause continuous up-down link conditions
on all ports. That is, the link (LK) LEDs on the ports will blink on and off.
If the condition lasts more than 10 seconds, reset one of the "twister"
units, or unplug and then reconnect one of the connectors. The links
should be established within a few seconds.
User's Guide 15