Alcatel-Lucent 9500 MXC User Manual page 442

Chapter 7. Node and Terminal Plug-ins
Vol. IV-7-52
result or where a fixed setting is preferred:
• Auto negotiation is not 100% reliable, particularly so where the
connected equipment is using an older auto-sensing mechanism.
• Links with a duplex mismatch will operate, but will generate a large
number of errors and will slow throughput.
• Generally, for auto negotiation to work, both interfaces must be set to
auto for speed and duplex.
• Full-duplex can only be achieved if both interfaces are either set for
auto-negotiation or are manually configured to use full duplex.
• Full duplex will not operate via a hub/repeater. These are half duplex
devices.
• If auto-negotiation is enabled on only one side of the link, it will always
default to half-duplex, regardless of what the other side of the link is
forced to.
• If one side of a link is forced to full duplex and the other is set to
auto-negotiation, a duplex mismatch will occur.
• You can force a new auto-negotiation by simply unplugging a host
cable for 10 seconds.
• Most 10 Mb interfaces can run only in 10 Mb half-duplex mode.
• Most 10/100 Mb interfaces support auto-negotiation and most 10/100
Mb interfaces with RJ-45 twisted-pair can run in full-duplex mode.
• Any network connected via an AUI port (Attachment Unit Interface),
such as on an external Ethernet transceiver, can run only in 10Mb
half-duplex mode.
: Click to view and select auto-detect or a specified cable type.
5.4 Mdi/MdiX
The normal setting is Auto, where the auto negotiation protocol senses
and sets the port connection cable type to Mdi or MdiX (straight or
cross-over cable respectively). The fixed options are used where auto
negotiation fails to provide the expected result or where a fixed setting is
preferred.
: Sets the port priority. The options are high, medium high,
5.5 Priority
medium low, and low. To change, select from the priority menu. Each
port can be prioritized in this way.
• This prioritization only has relevance where two or more ports use a
common channel.
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