Dell PowerConnect 2708 User's Guide - Page 48

MDIX Media Dependent Interface with Crossover, MDI Media Dependent Interface

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Current Port Speed - The actual synchronized port speed, in bits per second. Admin Duplex - Full Duplex (FDX) indicates that the switch interface supports transmission between the device and another station, in both directions simultaneously. Half Duplex (HDX) indicates that the interface supports transmission between the device and the other station in one direction only at a time. Current Duplex Mode - The synchronized port duplex mode of transmission. Auto Negotiation - Enables Auto Negotiation on the port. This feature is a protocol between two link partners that enables a port to advertise its transmission rate, duplex mode and flow control capacity to its partner (Auto Negotiation has to be enabled on both communicating devices to operate). Current Auto Negotiation - Specifies the current Auto Negotiating status. The possible statuses are On or Off. Admin Advertisement - Designates the possible parameters of transmission: Max Capability, 10 Mbps at Half Duplex, 10 Mbps at Full Duplex, 100 Mbps at Half Duplex, 100 Mbps at Full Duplex, or 1000 Mbps at Full Duplex. Current Advertisement - Specifies the current advertised port rate and mode of transmission. Backpressure - The Backpressure mechanism makes it possible to avoid a temporary congestion and buffer overflow in the switch, by prohibiting transmission from an input device to the congested output device, when the number of packets in the output device exceeds a given threshold value. The Backpressure mode is used in Half Duplex mode. The receiving port can use backpressure (that is, occupy the link so it becomes unavailable for additional traffic), to temporarily prevent the sending port from transmitting additional traffic. Backpressure can be enabled or disabled by setting the field. Current Backpressure - The current backpressure setting. Flow Control - The Flow Control mechanism enables lower speed devices to communicate with higher speed devices by requesting that the higher speed device refrains from sending packets. Transmission is temporarily halted to prevent buffer overflow. Flow Control can be enabled or disabled by setting this field. Enables or disables flow control, or enables Auto-negotiation of flow control on the port. Current Flow Control - Specifies the current Flow Control setting. The possible statuses are Enable, Disable, or Auto Negotiation. MDI/MDIX - Displays the MDI/MDIX status on the port. Hubs and switches are deliberately wired opposite the way end stations are wired, so that when a hub or switch is connected to an end station, a straight through Ethernet cable can be used, and the pairs are matched up properly. When two hubs or switches are connected to each other, or two end stations are connected to each other, a crossover cable is used to ensure that the correct pairs are connected. The possible field values are: MDIX (Media Dependent Interface with Crossover) - Use for hubs and switches. MDI (Media Dependent Interface) - Use for end stations. 48

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48
Current Port Speed
— The actual synchronized port speed, in bits per second.
Admin Duplex
— Full Duplex (FDX) indicates that the switch interface supports transmission
between the device and another station, in both directions simultaneously. Half Duplex (HDX)
indicates that the interface supports transmission between the device and the other station in one
direction only at a time.
Current Duplex Mode
— The synchronized port duplex mode of transmission.
Auto Negotiation
— Enables Auto Negotiation on the port. This feature is a protocol between two
link partners that enables a port to advertise its transmission rate, duplex mode and flow control
capacity to its partner (Auto Negotiation has to be enabled on both communicating devices to
operate).
Current Auto Negotiation
— Specifies the current Auto Negotiating status. The possible statuses
are
On
or
Off
.
Admin Advertisement
— Designates the possible parameters of transmission: Max Capability, 10
Mbps at Half Duplex, 10 Mbps at Full Duplex, 100 Mbps at Half Duplex, 100 Mbps at Full Duplex,
or 1000 Mbps at Full Duplex.
Current Advertisement
— Specifies the current advertised port rate and mode of transmission.
Backpressure
— The Backpressure mechanism makes it possible to avoid a temporary congestion
and buffer overflow in the switch, by prohibiting transmission from an input device to the
congested output device, when the number of packets in the output device exceeds a given
threshold value. The Backpressure mode is used in Half Duplex mode. The receiving port can use
backpressure (that is, occupy the link so it becomes unavailable for additional traffic), to
temporarily prevent the sending port from transmitting additional traffic. Backpressure can be
enabled or disabled by setting the field.
Current Backpressure
— The current backpressure setting.
Flow Control
— The Flow Control mechanism enables lower speed devices to communicate with
higher speed devices by requesting that the higher speed device refrains from sending packets.
Transmission is temporarily halted to prevent buffer overflow. Flow Control can be enabled or
disabled by setting this field. Enables or disables flow control, or enables Auto-negotiation of flow
control on the port.
Current Flow Control
— Specifies the current Flow Control setting. The possible statuses are
Enable, Disable, or Auto Negotiation.
MDI/MDIX
— Displays the MDI/MDIX status on the port. Hubs and switches are deliberately
wired opposite the way end stations are wired, so that when a hub or switch is connected to an end
station, a straight through Ethernet cable can be used, and the pairs are matched up properly.
When two hubs or switches are connected to each other, or two end stations are connected to each
other, a crossover cable is used to ensure that the correct pairs are connected. The possible field
values are:
MDIX (Media Dependent Interface with Crossover)
— Use for hubs and switches.
MDI (Media Dependent Interface)
— Use for end stations.