Allied Telesis AT-9000 Series - 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.