Allied Telesis AT-8100L/8POE, Руководство пользователя

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Chapter 4: Setting Port Parameters
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
Type — Transmission speed and medium, copper or fiber optic, of
the port. For example, 1000Base-SX indicates that the port is a
fiber optic gigabit standard.

Status — Indicates if the port is enabled or disabled. The default
setting is “Enabled.” Disabling a port turns off its receiver and
transmitter so that the port cannot forward traffic.

Link — Indicates whether the port has successfully connected to a
port on another switch or unit.

Auto-Neg — Auto-Negotiation. The setting is “Auto” or “Manual.”
The default is “Auto.”

Speed — Speed of the port. The possible options are 10 Mbps,
100 Mbps, and 1000 Mbps.

Duplex — Duplex mode of the twisted-pair port. The setting is
“Half” or “Full.”

Polarity — Indicates the port’s wiring configuration is MDI (medium
dependent interface), MDI-X (medium dependent interface
crossover), or the auto setting. This setting only applies to a
twisted-pair port that is operating at 10 or 100 Mbps.

Back Pressure — Indicates if back pressure is enabled or disabled
on the port. Back pressure is used by a port during periods of
packet congestion to temporarily stop its network counterpart from
transmitting more packets. This prevents a buffer overrun and the
subsequent loss and retransmission of network packets. A port
initiates back pressure 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 — Threshold level for back pressure on the
port. Specifies the number of cells for back pressure. The default
value is 7935 cells.

Flow Control — Indicates if flow control (send and receive) is
enabled or disabled on a port. If flow control is enabled, a port
sends pause packets when it reaches the point of packet
congestion. Also, the port stops transmitting packets when it
receives pause packets from its local or remote counterpart. When
flow control is disabled, the port transmits regardless of packet
congestion. In addition, the port continues transmitting packets
when it receives pause packets from its local or remote
counterpart. The default is “Disabled.”

Flow Control Limit — Threshold level for flow control on a port.
The default value is 7935.

Description — Description of a port. To specify this field, see
“Changing the Port Settings” on page 67.