Search /
Advanced search  |  Help  |  Site map
Click for Layer 8! No, really, click NOW!
Networking for Small Business
How a cyber cop patrols the underworld of e-commerce
Kill switches coming to iPhone, Android, Windows devices in 2015
Galaxy S5 deep-dive review: Long on hype, short on delivery
Google revenue jumps 19 percent but still disappoints
Windows XP's retirement turns into major security project for Chinese firm
Teen arrested in Heartbleed attack against Canadian tax site
Still deploying 11n Wi-Fi?  You might want to think again
Collaboration 2.0: Old meets new
9 Things You Need to Know Before You Store Data in the Cloud
Can Heartbleed be used in DDoS attacks?
Secure browsers offer alternatives to Chrome, IE and Firefox
Linksys WRT1900AC Wi-Fi router: Faster than anything we've tested
Heartbleed bug is irritating McAfee, Symantec, Kaspersky Lab
10 Hot Hadoop Startups to Watch
Server makers rushing out Heartbleed patches
Fortinet, McAfee, Trend Micro, Bitdefender battle in socially-engineered malware prevention test
Net neutrality ruling complicates US transition to IP networks
Net neutrality ruling complicates US transition to IP networks
6 Social Media Mistakes That Will Kill Your Career
Canonical's new Ubuntu focuses on the long haul
4 Qualities to Look for in a Data Scientist
Big bucks going to universities to solve pressing cybersecurity issues
Mozilla appoints former marketing head to interim CEO
Box patches Heartbleed flaw in its cloud storage systems
Obama administration backs disclosing software vulnerabilities in most cases

How far can Gigabit Ethernet go?

Related linksToday's breaking news
Send to a friendFeedback

Sign up to receive this and other networking newsletters in your inbox.

One thing to consider when installing any LAN technology is how far it can reach over fiber-optic lines or copper wires.

Maximum distances for Gigabit Ethernet vary widely, depending on the medium. The technology is designed to carry data for 25 meters over coaxial cable, but this version isn't widely used. Gigabit Ethernet over Category 5 unshielded twisted pair wires (using 1000Base-T) can travel for 100 meters, but products supporting this don't exist yet. Because of the short distance, copper Gigabit Ethernet is likely to be limited to server connections.

Multimode fiber-optic lines (using 1000Base-SX) will get you as much as a kilometer, so they're good for in-building and campus wiring. Equipment vendors say they can send data 10 km across single-mode fiber (using 1000Base-LX), for a distributed campus. With proprietary extensions, Gigabit Ethernet can stretch as much as 70 km with Foundry Networks switches, and as much as 50 km on Packet Engines switches (using the designation 1000Base-LH).

Now that these distances are possible companies are starting to use Gigabit Ethernet for connecting campuses around a city in metropolitan-area networks.

Jeff Caruso is senior editor at Network World, covering LAN hardware and network management software from his offices in San Mateo, Calif. In past reporting lives he has also written about WAN hardware, as well as mainframes and other computing platforms. You can reach him at Can't say enough about Gigabit Ethernet
Network World Fusion, 4/5/99

Tech Update: Readying copper pipes for Gigabit Ethernet
Network World, 4/5/99

Draft standard for Gigabit Ethernet over copper nearing completion, Gigabit Ethernet Alliance
Network World, 3/18/99

Net Resources: Gigabit Ethernet, includes articles and primers

Archive of Network World on High Speed LANs newsletters

NWFusion offers more than 40 FREE technology-specific email newsletters in key network technology areas such as NSM, VPNs, Convergence, Security and more.
Click here to sign up!
New Event - WANs: Optimizing Your Network Now.
Hear from the experts about the innovations that are already starting to shake up the WAN world. Free Network World Technology Tour and Expo in Dallas, San Francisco, Washington DC, and New York.
Attend FREE
Your FREE Network World subscription will also include breaking news and information on wireless, storage, infrastructure, carriers and SPs, enterprise applications, videoconferencing, plus product reviews, technology insiders, management surveys and technology updates - GET IT NOW.