Alcatel-Lucent 9500 MXC User Manual page 456

Chapter 7. Node and Terminal Plug-ins
Vol. IV-7-66
• 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 with an external Ethernet transceiver, can run only in 10Mb
half-duplex mode.
: Click to view and select auto-detect or a specified cable type.
6.4 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,
6.5 Priority
medium low, and low. To change, view and 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.
• Ports with a higher priority have their data packets accepted by the
queue controller ahead of lower priority ports on a strict priority basis.
Refer to Step 12, Priority Mapping, for more information on port
prioritization.
: An arrow indicates detection of valid Ethernet framing at the
6.6 Port Up
local port connection. Unconnected ports or ports with invalid framing
are red-flagged. This status indicator is derived from the auto-negotiation
process.
: A tick in a resolved box indicates that the DAC GE has
6.7 Resolved
determined the presence of valid Ethernet data from the locally
connected equipment, and where Auto has been selected, for
Duplex-Speed and/or Mdi/MdiX. If the port is not connected or is
physically connected but not resolved, the tick box will be empty and the
associated Port Up arrow will normally be red-flagged. Until resolved,
the port is not traffic-accepting. This auto-negotiation process only acts
and reports on data sensed from the locally connected equipment, it does
not respond to data received from the other end of the DAC GE/ES link.
7.
Maximum Frame Size sets the maximum frame size that can be accepted at the
switch interface. In turn it
which determines the largest datagram than can be transmitted without it
determines the Maximum Transmission Unit (MTU),
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