Using the SEHI100TX Hub View

802.3speciÞcations, or a node on the net is transmitting without Þrst listening for carrier sense (and beginning its illegal transmission more than 51.2 ∝s after the Þrst station began transmitting). Note that in both cases, the occurrence of the errors can be intermittent: in the case of excessive network length, OOW collisions will only occur when the farthest stations transmit at the same time; in the case of the node which is transmitting without listening, the malfunctioning node may

only fail to listen occasionally, and not all of its failures to listen will result in OOW collisions Ñ some may simply result in collisions (if the 51.2 ∝s window has not yet closed), and some will get through Þne (if no one else happens to be transmitting).

Runt Frames

The number of received packets smaller than the minimum Ethernet frame size of 64 bytes (excluding preamble). This minimum size is tied to the maximum propagation time of an Ethernet network segment Ñ the maximum propagation time is 51.2 ∝s, and it takes approximately 51.2 ∝s to transmit 64 bytes of data; therefore, every node on the segment should be aware that another node is transmitting before the transmission is complete, providing for more accurate collision detection. Runts can sometimes result from collisions, and, as such, may be the natural by-product of a busy network; however, they can also indicate a hardware (packet formation), transmission (corrupted data), or network design (more than four cascaded repeaters) problem.

Giant Frames

The number of received packets that are longer than the maximum Ethernet size of 1518 bytes (excluding preamble). Giant packets typically occur when you have a jabbering node on your network Ñ one that is continuously transmitting, or transmitting improperly for short bursts Ñ probably due to a bad transmitter on the network interface card. Giant packets can also result from packets being corrupted as they are transmitted, either by the addition of garbage signal, or by the corruption of the bits that indicate frame size.

The SEHI100TX Error Priority Scheme

Each Cabletron device employs an error priority scheme which determines how packets with multiple errors will be counted, and ensures that no error packet is counted more than once. The priority scheme for the SEHI100TX counts errors in the following order:

1.OOW Collisions

2.Runts

3.Giants

4.Alignment Errors

5.CRC Errors

Monitoring Hub Performance

2-19

Page 32 Page 34
Page 33
Image 33
Cabletron Systems SEHI100TX-22 manual Runt Frames, Giant Frames
Page 32 Page 34

SEHI100TX-22 specifications

Cabletron Systems SEHI100TX-22 is a high-performance network interface card that has been designed for reliable data transfer in various networking environments. Ideal for both enterprise and small business applications, the SEHI100TX-22 delivers exceptional performance at a competitive price point.

One of the standout features of the SEHI100TX-22 is its support for 100Base-TX Ethernet standards, which enables high-speed data transmission at rates of up to 100 Mbps. This high throughput capacity makes it an excellent choice for organizations that require swift and efficient data handling, particularly in environments with heavy network traffic.

The card is equipped with two RJ-45 connectors, allowing it to support dual-port configurations. This dual-port setup enhances networking capabilities by enabling fault tolerance and load balancing, ensuring that the network remains operational even in the event of a failure. Moreover, it supports full-duplex operation, allowing for simultaneous bi-directional data transmission, further improving overall network efficiency and performance.

Another significant advantage of the SEHI100TX-22 is its compatibility with a wide range of operating systems and platforms, including Windows, Linux, and various UNIX variants. This versatility ensures that it can be seamlessly integrated into existing network infrastructures without the need for extensive configuration or modification.

In terms of installation and maintenance, the SEHI100TX-22 is user-friendly, thanks to its Plug and Play capability. This feature allows for easy installation; users can simply insert the card into an available PCI slot, and the operating system will automatically recognize and configure the device, minimizing downtime and simplifying the setup process.

Additionally, the SEHI100TX-22 incorporates advanced technologies like Auto-Negotiation, which automatically detects the speed and duplex capabilities of the connected device, thus optimizing the network performance. The card also features various onboard diagnostic LEDs, providing real-time feedback on connection status and data activity, which aids in troubleshooting and performance monitoring.

In summary, the Cabletron Systems SEHI100TX-22 offers a robust set of features that cater to the demands of modern network environments. With its high-speed capabilities, dual-port support, compatibility across multiple operating systems, and user-friendly installation process, it remains a solid choice for organizations looking to enhance their networking performance and reliability.
Top Page Image Contents