8
Installation Guide
Link Loss Carry Forward
Link Loss Carry Forward (LLCF) is provided as an aid in troubleshoot-
ing a remote connection. When LLCF is enabled, loss of the receive
signal at the TX port prevents the FX port from transmitting an idle
signal onto the cable. Conversely, if the FX port does not detect a
receive signal, the TX port does not transmit an idle signal.
When LLCF is disabled (default), the card continually transmits idle
signals on both ports.
Warning: If LLCF is enabled on a remote access line card and there is
no link on the card’s copper port, you will NOT be able to manage that
remote card.
Refer to
Link Loss Carry Forward
for further details.
Auto-Negotiation
Auto-negotiation (AN) is only supported on the copper port. Enable AN
to establish a full duplex connection with another auto-negotiating
device or to force the port to half duplex.
When AN is enabled, the copper port advertises 100Mbps and full/half
duplex capability. The line card cannot auto-negotiate speed, which is
set to 100Mbps.
When AN is disabled (default), the copper port is set to full duplex.
IMPORTANT: The duplex mode of the device connected to the fiber
port must be the same as the copper port’s connection.
Link Loss Return
Link Loss Return (LLR) is only applicable to the fiber optic port. When
LLR is enabled, loss of the receive signal at the port disables its own
transmit link.
When LLR is disabled (default), the fiber port continually transmits an
idle signal.
Refer to
Link Loss Return
for additional information.
