Chapter 4: Setting Port Parameters

from white to brown and you cannot select them. To change the Speed and Duplex Mode fields, change the Negotiation setting to “Manual.”

Speed— Indicates the port speed. Select 10mb, 100mb, or 1000mb.

Duplex Mode— Sets the set the duplex modes of the twisted pair ports or activates Auto-Negotiation manually. The settings are half, full, or Auto Negotiation. Ports operating in half-duplex mode can either receive or transmit packets, but not both at the same time. Ports operating in full-duplex can both send and receive packets, simultaneously.

Polarity— Sets the wiring configuration of the twisted pair ports when they are operating at 10 or 100 Mbps, in either half- or full- duplex mode.

A twisted pair port that is operating at 10 or 100 Mbps can have one of two wiring configurations. The configurations are known as MDI and MDI-X. To forward traffic, a port on the switch and a port on a network device must have different settings. For instance, the wiring configuration of a switch port has to be MDI if the wiring configuration on a port on a network device is MDIX.

To set this parameter on a port, you must set the speed and duplex mode manually. A port that is using Auto-Negotiation sets its wiring configuration automatically using auto-MDI/MDIX.

Back Pressure Status— Activates or deactivates back pressure on the ports. Use this field to enable or disable back pressure on ports that are operating at 10 or 100 Mbps in half-duplex mode.

Back pressure 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 back pressure by transmitting on the shared link to cause a data collision, which causes its link partner to cease transmission.

To set back pressure on a port, you must configure the speed and duplex mode manually. You cannot set back pressure on a port that is using Auto-Negotiation.

Back Pressure Limit (1 - 7935)— Indicates a threshold level for back pressure on a port. Specifies the number of cells for back pressure. A cell represents 128 bytes. The range is 1 to 7935 cells. The default value is 7935 cells.

Flow Control Status— Enables or disables the flow control feature. By default, flow control is disabled on a port.

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Allied Telesis AT-9000/52, AT-9000/28SP manual Setting Port Parameters
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AT-9000/52, AT-9000/28SP, AT-9000/28 specifications

The Allied Telesis AT-9000/28 is a versatile and robust network switch designed for organizations seeking to enhance their networking capability. This Layer 2 managed switch delivers a high degree of performance and reliability, making it an ideal choice for businesses that require a seamless network experience.

One of the main features of the AT-9000/28 is its 28 ports, which include 24 Fast Ethernet ports and 4 Gigabit Ethernet uplink ports. This allows for flexible network configuration and scalability, accommodating both wired and wireless devices efficiently. The switch also supports auto-negotiation and auto-MDI/MDI-X, which simplifies installation and connectivity by automatically detecting and configuring the appropriate settings.

The AT-9000/28 employs advanced switching technologies, such as IEEE 802.1Q VLAN tagging, which enables the segregation of traffic for improved security and performance. This feature is crucial for businesses that require data isolation between different departments or user groups. In addition, the switch supports quality of service (QoS) protocols, allowing for traffic prioritization. This is particularly beneficial for organizations that handle multimedia applications or VoIP services that demand reliable bandwidth.

Another significant characteristic of the AT-9000/28 is its support for port mirroring. This capability is essential for network monitoring and troubleshooting, as it allows administrators to track and analyze network traffic efficiently. Furthermore, the switch supports multiple user authentication methods, including RADIUS and TACACS+, thus enhancing network security.

The AT-9000/28 is built with energy efficiency in mind, featuring Energy Efficient Ethernet (EEE) technology. This reduces power consumption during periods of low traffic without compromising performance, which aids in lowering overall operational costs.

In terms of management, the AT-9000/28 offers versatile management options, including a web-based GUI, Command Line Interface (CLI), and SNMP support. This flexibility enables network administrators to configure, monitor, and troubleshoot the switch easily.

Overall, the Allied Telesis AT-9000/28 is a reliable switch well-suited for a variety of network environments. Its combination of performance, security features, and energy efficiency makes it an excellent choice for organizations looking to optimize their network infrastructure. With robust capabilities and advanced technologies, the AT-9000/28 stands out as a valuable addition to any networking setup.
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