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How long is the fiber run? FX is 100mb fiber and SX is short haul. Depending on the distance you might need LX, but probably not if it worked with FX. I don't see any reason why it wouldn't work just fine.
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How long is the fiber run? FX is 100mb fiber and SX is short haul. Depending on the distance you might need LX, but probably not if it worked with FX. I don't see any reason why it wouldn't work just fine.

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Both buildings are a little over 100 meters.
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Both buildings are a little over 100 meters.

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Right now we have 2 buildings connected to each other using a Fiber Media converter box. &nbsp;I have a set of switches in each building and building to building connection goes through a 10/100 Base FX to 10/100 Base TX Converter box Auto Negotiation enabled. &nbsp;Both buildings have this box with SC connections. &nbsp;Now I am upgrading my switched to Gig Switches in both buildings. &nbsp;Can I get a 10/100/1000 Base SX converter box on both ends to make it work? &nbsp;Like this one? &nbsp;<br />
<a href="http://aaxeon.com/products/media-converters/unmanaged-converters/10-100-1000tx-to-1000fx/3579" rel="ugc">http://aaxeon.com/products/media-converters/unmanaged-converters/10-100-1000tx-to-1000fx/3579</a><br />
What is the difference between the FX, SX and if I get the same type at both ends will it work? &nbsp;I am unfamiliar with fiber so any suggestions or information would be appreciated. &nbsp;Thanks.
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Right now we have 2 buildings connected to each other using a Fiber Media converter box.  I have a set of switches in each building and building to building connection goes through a 10/100 Base FX to 10/100 Base TX Converter box Auto Negotiation enabled.  Both buildings have this box with SC connections.  Now I am upgrading my switched to Gig Switches in both buildings.  Can I get a 10/100/1000 Base SX converter box on both ends to make it work?  Like this one?  
http://aaxeon.com/products/media-converters/unmanaged-converters/10-100-1000tx-to-1000fx/3579
What is the difference between the FX, SX and if I get the same type at both ends will it work?  I am unfamiliar with fiber so any suggestions or information would be appreciated.  Thanks.

100 Base FX upgrade to 1000 Base SX?

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries, organized in abstraction layers, traditionally called "Link," "Internet," "Transport" and "Application”. Its routing function enables internetworking, and essentially establishes the Internet. IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.

Internet Protocols

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.