AT-29xx Series Gigabit Ethernet Network Adapters Installation Guide

Setting this parameter higher allows the NIC to buffer larger bursts of network traffic without dropping frames, especially on slower systems. Note that the driver may not be able to allocate the required amount of memory if this parameter is set too high. This parameter should not be set less than 50 if adaptive_coalesce (see below) is enabled.

ˆrx_jumbo_desc_cnt

Configures the number of receive descriptors for jumbo frames larger than 1528 bytes. The default is 128 and the valid range is from 1 to

255.When jumbo frames larger than 1528 bytes are used, do not set this parameter to lower than 60 on systems with high network traffic. Setting this parameter higher allows the NIC to buffer larger bursts of jumbo traffic without dropping frames, especially on slower systems. Depending on kernel and system architecture, the driver may require up to 268 bytes per descriptor. Note that each descriptor also requires a buffer the size of a maximum jumbo frame. On systems with insufficient memory, it may be necessary to reduce this parameter. This parameter should not be set to less than 50 if adaptive_coalesce (see below) is enabled. When the maximum frame size is less than 1528 (MTU size less than 1514), this parameter is not used and is always 0.

ˆadaptive_coalesce

Enables or disables adaptive adjustments to the various interrupt coalescing parameters. Enabling it allows the driver to dynamically adjust the interrupt coalescing parameters to achieve high throughput during heavy traffic and low latency during light traffic. Do not set rx_std_desc_cnt (and rx_jumbo_desc_cnt if using jumbo frames) to less than 50. Also, do not set tx_pkt_desc_cnt to less than 80 when this parameter is enabled. Choose from the following selections:

–0 - disabled

–1 - enabled (default)

ˆrx_coalesce_ticks

Configures the number of 1 usec ticks before the NIC generates receive interrupt after receiving a frame. This parameter works in conjunction with the rx_max_coalesce_frames parameter. Interrupt is generated when either of these thresholds is exceeded. A value of 0 means this parameter is ignored and an interrupt is generated when the rx_max_coalesce_frames threshold is reached. The valid range is from 0 to 500 and default is 80. This parameter is not used and is adjusted automatically if adaptive_coalesce is set to 1.

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Allied Telesis AT-2931SX, AT-2916LX10/LC-901, AT-2916SX, AT-2972T/2 ˆ rxjumbodesccnt, ˆ adaptivecoalesce, ˆ rxcoalesceticks
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AT-2916LX10/LC-901, AT-2972SX, AT-2972SX/2, AT-2972LX10/LC-901, AT-2916SX specifications

The Allied Telesis AT-2972T/2 is a highly capable 10/100 Mbps Fast Ethernet switch designed to provide reliable performance and advanced management features for small to medium-sized businesses. This switch is built on a robust technology platform, making it an ideal choice for organizations looking to enhance their network infrastructure while ensuring scalability and flexibility.

One of the main features of the AT-2972T/2 is its support for 24 ports, allowing for extensive connectivity in a compact footprint. This makes it suitable for environments where space is limited but connectivity demands are high. With auto-negotiation on all ports, the switch automatically detects the best speed and duplex mode, ensuring optimal performance and seamless integration into existing networks.

The AT-2972T/2 incorporates advanced Layer 2 switching capabilities, enabling efficient handling of data traffic. Its ability to support VLAN (Virtual Local Area Network) tagging allows for network segmentation, improving performance and security. This feature is particularly beneficial for organizations that require different departments or teams to maintain their network traffic separately.

Quality of Service (QoS) is another significant aspect of the AT-2972T/2. The switch provides multiple traffic prioritization levels, ensuring that critical applications receive the necessary bandwidth to function effectively. This is essential in maintaining the performance of real-time applications such as VoIP and video conferencing, which are increasingly crucial in today’s business environment.

The built-in diagnostics features of the AT-2972T/2 enhance its reliability and ease of management. With capabilities such as loop detection and port mirroring, network administrators can quickly troubleshoot issues and monitor traffic flow to ensure a stable network.

Power over Ethernet (PoE) support is available in some configurations of the AT-2972T/2, allowing the switch to deliver power to connected devices such as IP cameras and wireless access points. This capability simplifies installations and reduces the need for additional power sources, streamlining the deployment of network devices.

Furthermore, the switch is designed with energy efficiency in mind, adhering to environmental standards that help organizations reduce their carbon footprint while cutting energy costs.

In summary, the Allied Telesis AT-2972T/2 stands out as a versatile and robust Fast Ethernet switch, equipped with essential features like VLAN support, QoS, PoE, and advanced diagnostics. Its combination of performance, management capabilities, and energy efficiency makes it an excellent choice for businesses aiming to build a reliable and future-proof network infrastructure.
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