Passive optical LAN: When network speed, bandwidth and security matter

Computer Weekly

Copper-based local area networks are increasingly unfit for purpose in a digital enterprise, but passive optical LANs may be a solution. Tech evangelist Paul Ryan, chair of the Association of Passive Optical LAN, explains why

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Cisco Revives LAN-SAN Convergence Play in the Data Center

Data Center Knowledge

Cisco Networking Storage Cisco DCNM Cisco MDS 9000 Cisco Nexus 9000 FCIP FCoE LAN SAN convergence storage networking Tony AntonyWith all the ingredients finally in place in one family of switches and a revised family of storage directors, will convergence happen at last? Read More.

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The LAN: A History of Network Operating Systems Part 12

IT Toolbox

the network system calls then provided under interrupt 21H gave all suppliers of network software the capability to standardize at least some of the access to LAN hardware. Most manufacturers of LAN software had announced or implemented support of NETBIOS for IBM LANs When DOS was extended in Version 3.1,

LANs as the User Interface in a Distributed Network

IT Toolbox

The appropriate solution was to have only the connection to the LAN with the LAN gatewayed to the larger network and providing the appropriate terminal emulation

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The LAN: A History of Network Operating Systems Part 3

IT Toolbox

Even though the earliest LANs were of this genre, by 1989 it appeared that they were on the way out. By 1992, however, new life had been breathed into peer-to-peer networking by both Novell and Microsoft, along with the popularity of Artisoft's LANtastic. We will take a close look at peer-to-peer LANs at a deeper level in some future posts

IBM's Impact on LANs

IT Toolbox

Particularly in the areas of microcomputers, LANs, and enterprise networking, IBM's insistence that its customers remain "pure blue" ran against both the economic and technological developments set in motion before 1990

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LANs for Organizational Needs

IT Toolbox

The earlier manifestations of the PC-based LANs, by way of contrast, were not designed to provide connectivity except to a file server and to other micros on the network

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The LAN: A History of Network Operating Systems Part 10

IT Toolbox

In the past, if we wished to attach some other random LAN to this system, we typically needed a gateway to perform protocol conversion from whatever the LAN was using (assuming that it was not running the same DECnet protocol) to the DECnet protocols

LANs Moving Beyond the 1990s

IT Toolbox

LANs are rapidly becoming a basic building block in the structuring of truly global networks that will make the ideal of a global village possible

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The LAN: A History of Network Operating Systems Part 11

IT Toolbox

The NETwork Basic Input Output System (NET-BIOS) was introduced at the same time IBM announced the PC Network in 1984. The network microcode was the foundation for program control of the IBM LANs; it resides in ROM on the Adapter Card, on diskette, or on the PC's motherboard

Origins of Linking LANs

IT Toolbox

In an organizational context, networks provided the means for allowing the computing power available to be used to its most complete extent

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Proper LAN Testing Equipment Part 4

IT Toolbox

The digital (or discrete) signal levels present at the LAN interfaces to PCs, printers, modems and other peripherals are the test points most familiar to network managers

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The LAN: A History of Network Operating Systems Part 8

IT Toolbox

In addition to the network architectures mentioned above, other protocol or protocol-like issues were of great importance

The LAN: A History of Network Operating Systems Part 7

IT Toolbox

The fileservers were usually high-performance PCs running under some operating system that allows multiple activities to take place concurrently. Two approaches have been taken by NOS manufacturers

The LAN: A History of Network Operating Systems Part 9

IT Toolbox

In the early 1990s, there seemed to have been some convergence on the use of 802.2 (LLC) LLC) and 802.3/802.5 Mac sub-layers as the basic Physical and Data Link Layer technology. Every major manufacturer provided this alternative, and over time it became a common methodology employed

The LAN: A History Network Operating Systems Part 1

IT Toolbox

Under the best of circumstances, the end-user should not even know that a network exists. If he wishes to do something simple, like copy a file from one place to another, it should be possible to use something like the old MS/DOS copy command and simply type: COPY c:mydata.dat p:yourdata.dat.

The LAN: A History of Network Operating Systems Part 5

IT Toolbox

In general, pipes are software developers' tools for easily creating communications routines in software without having to explicitly control and issue commands to the communications hardware

The LAN: A History of Network Operating Systems Part 4

IT Toolbox

The approaches to integrated networking implemented by Banyan and Novell are difficult to match to the OSI model as well. The architectures presented in this series of posts were changing rapidly during the times that these platforms were in use, so they often differed from what you actually bought in a given product release

The LAN: A History of Network Operating Systems Part 2

IT Toolbox

Before proceeding further, a brief comment on the use of the terms "proprietary" and "open system" is probably in order

The Impacts of IBM's SNA Networking on LANs Part 2

IT Toolbox

IBM did not, for the most part, sell SNA as a generalized networking solution independent of its own product line. It was designed to be a networking solution primarily revolving around an information environment that has IBM-designed large or mid-range computers at the center

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The Impacts of IBM's SNA Networking on LANs Part 4

IT Toolbox

Support for resource sharing is particularly important since in a modern data communications network one primary objective is (or should be) extensive connectivity among end-users and devices

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The Impacts of IBM's SNA Networking on LANs Part 3

IT Toolbox

SNA is a layered architecture similar to the International Standards Organization's Open Systems Interconnection (OSI) model. SNA proper is divided into only five (not seven) layers?End End User and Physical layers are not part of the formal scope of SNA

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The Impacts of IBM's SNA Networking on LANs Part 1

IT Toolbox

IBM also supported a wide variety of other software interfaces, as well, including IEEE's Logical Link Control (LLC). In addition, IBM sold a number of Ethernet (802.3) related products during this time as a hedge

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The Impact of Digital's DNA on LANs

IT Toolbox

DEC's implementation of Ethernet was sufficiently important to its view of networking. As a note, DEC was bought out by Compaq which was later acquired by HP

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The Impacts of IBM's SNA Networking on LANs Part 5

IT Toolbox

PU-T2.1 was defined in 1983 and is designed for peer-to-peer coupling (for PCs, for example) or subarea routing. The former is, in principle, nonmediated?that that is, it is not necessary for routing through VTAM or NCP, although two PCs communicating with one another through different SNA cluster controllers will probably have to pass through the Communications FEP

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Secure LAN Messaging

Galido

If your company’s policy is to maintain an independent network with safe, secure and effective intra-office communication, external cloud messaging applications may not meet your needs. Softros LAN Messenger. Message history can be saved locally or on a network share.

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Putting Together Your LAN Troubleshooting Toolkit

IT Toolbox

After seeing this smorgasbord of equipment available for helping you to test and troubleshoot your network, the next logical question is, "Which tools should I purchase for my network?" Here are some guidelines

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Proper LAN Testing Equipment Part 2

IT Toolbox

Instead of providing details on the subject of power protection per se, I will concentrate this time on test equipment that a typical network administrator might use Volumes have been written regarding the damage that electrical transients, surges, and improper grounding techniques can cause to sensitive computer equipment ? including many of my previous posts.

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Proper LAN testing Equipment Part 1

IT Toolbox

Each network, because of its uniqueness, will require additions and deletions to this smorgasbord. A variety of devices, including cabling system testers, power line monitors, and analog and digital interface diagnosis equipment will be discussed. This is by no means an exhaustive list. Use it only as a guide?a a starting point for assembling your own tool kit

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The Cloud Job Market Update: SDN and APIs Are Hot

Data Center Knowledge

Cloud Computing Data Center Jobs Networking Virtualization API jobs LAN software-defined networking The digitization of the modern data center has created the need for even more robust services and control methods.

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Accessing Other Networks in the Early Years

IT Toolbox

The network operating system or other networking software could make moving from one PC LAN to another either simple or complicated

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The Domination of TCP/IP on the LAN Part 1

IT Toolbox

Some networks, in fact, could use IP but not TCP, preferring instead to use some alternative protocol at the transport layer TCP provides the packet sequencing, error control, and other services required to provide reliable end-to-end communications while IP takes the packet from TCP and passes it through whatever gateways are needed, for delivery to the remote TCP layer through the remote IP layer.

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The Broadband Networks

IT Toolbox

Applications for SMDS include LAN interconnection; high-speed, remote database access; packet audio and video; resource sharing by educational institutions; image transfer; and teleradiology

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The Bygone days of LAN Gateways and Bridges

IT Toolbox

That was the state as we grew networks through the 1990s. But these devices also disappeared into routers and switches such that it was easier to simply light up a port in a switch that was used to bridge to another switch representing another network. These sorts of devices are rarely seen today as stand-alone hardware products

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How Networks Enabled Distributed Computing

IT Toolbox

At that some point it will be important to understand how LANs fit into the overall OSI scheme of things, and that will be illustrated by reference to MAP, the Manufacturing Automation Protocol in some future post

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