Archive for the ‘RJ45’ Category

Media converters – Explained

Saturday, November 14th, 2009

Media converters

  • Seamlessly integrate 10, 100, and 1000 BASE-T, ThinNet, Thicknet and fibre optic cabling.
  • Inexpensively connect half- or full-duplex 100BASE-TX and 100BASE-FX!
  • Switch between different wiring systems without adding to your overall network repeater count.
  • Convert to fibre and run cables across an extra-long distance-up to 50 kilometres or more!
  • Have an Ethernet switch with RJ-45 ports? No problem! Use a converter to attach legacy AUI and BNC or new fibre segments.

What are Media Converters?
Media converters are simple networking devices that enable you to interconnect networks or network devices with different speeds, operation types, modes and media types. Operation addresses half- and full-duplex dissimilarities. Mode addresses different wavelengths in a fibre optic environment. And media type can be multimode, single-mode or twisted-pair cable.

Benefits of Media Converters:
Media converters play an important role in today’s multiprotocol, mixed-media networks. For example, LAN administrators can deploy media converters to integrate fibre optic cabling and active equipment into existing copper-based, structured cabling systems while achieving significant cost savings. In general, media conversion can deliver the following benefits for your network environment:

Cost Reduction
You can use media converters with cost-effective Ethernet switches to do the same job as expensive hybrid media switches and reduce your overall networking costs in the process. Media converters can also be used with fibre optic cabling to bridge the last mile in your network or to establish a WAN connection up to 100 kilometres. This type of media converter solution can cost significantly less than one that relies on higher-layer devices such as routers or switches.

Investment Protection
Media converters enable you to protect your existing network investment. As simple network devices, media converters can easily be located or relocated to other areas within the installation, further leveraging the original investment. Additionally, they extend the productive life of your fibre and copper wiring plants by being able to interconnect different devices supporting various media types (coaxial cable, twisted pair, single-mode or multimode fibre), different wavelength modes (850 nm, 1310 nm or 1550 nm) or dissimilar speeds (10 Mbps, 100 Mbps or 1000 Mbps).

Flexibility and Simplification
Media converters offer the flexibility of combining copper with 850 nm and 1300 nm multimode fibre and 1310 nm and 1550 nm single-mode fibre. Slide-in media conversion cards for all cable types can reside in one media conversion chassis. With protocol transparency, Ethernet speed can be supplied anywhere in the network-local or remote-whether it’s a LAN or the WAN environment. Every device can also be smoothly integrated into your workgroup or the enterprise-wide network, regardless of the type of bit rate transparency or the bit rate conversion that’s supported.

Ease of Use and High Availability
Media converters are much easier to handle and to manage than higher-layer devices. Configuring and installing redundant solutions is neither complex nor cost intensive. And by adding management functions to your media converters, you can minimise downtime and make troubleshooting easier.

What Kinds of Media Converters Exist?

Basic Media Converter
A basic media converter is a Layer 1 device that transparently passes through all information. It has a very low path-delay value and does not count as a repeater. Basic media converter functions may include FibreAlert, LinkLoss and single-strand fibre conversion. Along with its all-transparent behaviour, a basic media converter’s key advantage is its low cost.

Switched Media Converter
A switched media converter not only converts media types and fibre mode but also speed and duplex mode. As the name implies, a switch is integrated into the converter to provide additional functionality. This switch function is its key advantage and often enables you to securely combine multiple Ethernet interfaces onto one fibre or prioritise traffic over the link.

Managed Media Converter
A managed media converter can be controlled and monitored locally and remotely. It can support command line interface, Telnet connections or SNMP functions for integration into an element manager or a management platform. Its key advantages are easier troubleshooting and reduced downtime.

Possible Media Converter Features:

LinkLoss™ Feature
When either a twisted-pair or a fibre link is broken, the information about this link loss is transferred to the other media link. For example, when a cable breaks on the fibre segment of a conversion, LinkLoss detects the error and passes this information to the twisted-pair segment. This results in a loss of link on the remote twisted-pair device. If LinkLoss is enabled on that device, the device’s green Link LED goes out, informing the local supervisor that there’s something wrong with the link.

FibreAlert™ Feature
What if only one strand of a fibre segment is broken? The FibreAlert feature enables the media converter at the receiver end to detect this type of link loss. The media converter stops transmitting data and a link signal until it begins receiving a signal or link pulse again. If there’s no signal or pulse, Link LEDs on the media converters at both ends of the fibre segment go out, indicating a fault somewhere in the segment. This way, a local site administrator is notified of a cable fault and can quickly locate it.

Wavelength Division Multiplexing (WDM) Feature
Black Box’s new WDM media-conversion products enable you to double your fibre optic plant capacity by using Wavelength Division Multiplexing technology. With a WDM converter, you can send more than one optical signal through the same fibre strand. WDM modulates each of several data streams onto a different part of the light spectrum. In this way, it increases the amount of data that a fibre optic cable can transport.

There are two flavours of WDM media converters: one fibre link and single-strand fibre. The one-fibre link version transports two links onto one duplex fibre link. The single-strand fibre version transports one link over a single strand of fibre.