Allied Telesis AT-9000 Series User Manual
Page 60
Chapter 4: Setting Port Parameters
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4. The following fields are displayed:
Interface— Port number.
Type— Indicates if the port is fiber or copper. If fiber: 1000Base-
SX/LX/CX; if copper: 10/100/1000Base-T.
Status— Indicates if the port is enabled or disabled. The default
setting is “Enabled.” Disabling ports turns off their receivers and
transmitters so that they cannot forward traffic.
Link— Indicates whether the port has successfully connected to a
port on another switch or unit.
Negotiation— Indicates Autonegotiation or Manual. By default,
Autonegotiation is enabled.
Speed— Speed of the port. The default setting is “1 Gbps” for
1000Mbps. The other possible options are 10Mbps and 100Mbps.
Duplex— Duplex mode of the twisted pair ports or Auto
Negotiation. The three settings are half, full, and Auto Negotiation.
Polarity— Indicates if the port’s wiring configuration is MDI
(medium dependent interface) or MDI-X (medium dependent
interface crossover). This setting only applies to a twisted pair port
that is operating at 10 or 100 Mbps.
Note
You can enable or disable backpressure on ports where you
disabled Auto-Negotiation, and set the speeds and duplex modes
manually to 10 or 100 Mbps in half-duplex mode.
Back Pressure— Indicates if back pressure is enabled or disabled
on a port. Backpressure is used by ports during periods of packet
congestion to temporarily stop their network counterparts from
transmitting more packets. This prevents a buffer overrun, and the
subsequent loss and retransmission of network packets. A port
initiates backpressure by transmitting on the shared link to cause a
data collision, which causes its link partner to cease transmission.
The default setting is “Disabled.”
Back Pressure Limit— Indicates the threshold level for back
pressure on a port. Specifies the number of cells for back
pressure. The default value is 7935 cells.