Knowledge Base

The purpose of this article is to discuss the concept of Bit Error Ratio testing, and will explain, using a minimum amount of math, the answer to the fairly common question: "How many bits do I need to send in order to verify that a devices exceeds a given BER?"

A brief list of acronyms used in the Ethernet, Fast Ethernet, Gigabit Ethernet, 10Gigabit Ethernet and Power over Ethernet consortia.

A series of networking tutorials focused on Ethernet technology.

Design And Implementation Of A Linux SCSI Target For Storage Area Networks.

Design and Implementation of a SCSI Target for Storage Area Networks.

iSCSI is an emerging storage network technology that allows for block-level access to disk drives over a computer network. Since iSCSI runs over the very ubiquitous TCP/IP protocol it has many advantages over its more proprietary alternatives. Due to the recent movement toward 10 gigabit Ethernet, storage vendors are interested to see how this large increase in network bandwidth could benefit the iSCSI protocol.

In order to make full use of the bandwidth provided by a 10 gigabit Ethernet link, specialized Remote Direct Memory Access hardware is being developed to offload processing and reduce the data-copy-overhead found in a standard TCP/IP network stack. This thesis focuses on the development of an iSCSI implementation that is capable of supporting this new hardware and the evaluation of its performance.

This thesis depicts the approach used to implement the iSCSI Extensions for Remote Direct Memory Access (iSER) with the UNH iSCSI reference implementation. This approach involves a three step process: moving UNH-iSCSI from the Linux kernel to the Linux user-space, adding support for the iSER extensions to our user-space iSCSI and finally moving everything back into the Linux kernel. In addition to a description of the implementation, results are given that demonstrate the performance of the completed iSER-assisted iSCSI implementation.

Design, Implementation, and Performance Analysis of Session Layer Protocols for SCSI over TCP/IP.

Design, Implementation, and Performance Analysis of the iSCSI Protocol for SCSI Over TCP/IP.

An informative presentation on the basics of iSCSI.

Terms used when discussing PTP

Terms used when discussing PTP

An overview of the 100BASE-TX PMD created by the UNH-IOL.

This presentation provides a high level overview and introduction to Spanning Tree, and related technologies.

The presence of crosstalk is a major detriment to the performance of Digital Subscriber Line (DSL) transceivers. It is therefore important to test performance under a wide variety of crosstalk scenarios. This thesis presents the development of a crosstalk noise generation system as a tool for DSL performance testing. Where many commercially available solutions are limited to specific testing needs, the system presented here is universal and can simulate virtually any noise scenario conceivable for DSL deployment.
Several requirements for the accurate frequency domain modeling of DSL crosstalk are presented. The time domain properties of crosstalk were also studied with particular attention paid to the amplitude distribution. The importance of a Gaussian amplitude distribution and the limiting effect of a finite-length pseudo-random crosstalk sequence on the "tail" of the Gaussian distribution were investigated. A method of forcing finite-length crosstalk sequences to have a "near-Gaussian" amplitude distribution is proposed.

An overview of Gigabit Passive Optical Networks (GPON) conformance and interoperability capabilities. A brief introduction to the power of PONs.

This presentation provides a high level overview and introduction to Multiple Spanning Tree, and related technologies.

This is an informal glossary for educational purposes. It is reviewed by experts but is not intended to replace more formal definitions in standards. (Click the “Notes” link at the website for details.)

This presentation provides a basic overview of IEEE 802.1 Bridging, and related technologies.

This presentation provides a high level overview and introduction to VLAN and GVRP, and related technologies.

This presentation provides a high level overview and introduction to Link Aggregation, and related technologies.

This presentation provides a high level overview and introduction to Port-Based Authentication, and related technologies.

This presentation provides a high level overview and introduction to Provider Bridges.

The official IEEE website reference.

John Eidson's general overview of the technology, the standard, and applications, plus other topics. Hosted at NIST. This regards only PTP version 1. (Version 2 is from 2008.)

This presentation provides an overview and introduction to Voice over DSL (VoDSL) technologies. The presentation covers the basics of channels voice over DSL, Voice over ATM (VoATM) and Voice over IP (VoIP). The presentation also includes a quick introduction to BLES, which is used to transport voice of AAL2 over ATM.