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How Does Copper DS3 Compare To Fiber DS3?

Delivery of dedicated bandwidth services to meet business data network requirements is evolving at breakneck speed (no pun intended). But that doesn't mean your options are limited. In fact....it really creates more opportunity to be creative.

Case in point is set up of DS3 connectivity for local loops.

According to my knowledge nowdays most of the DS3 drops are connected by fiber. But is that description entirely accurate?

DS3 hand-off is always done as copper. However, I've never heard of any LEC stringing coax DS3 cables across telephone poles; the coax DS3 is used within the building where the hand-off takes place.

To ride between buildings (e.g. to the CO), DS3 is muxed-up to OC3 or higher. This means that to get a single DS3 into a building with no fiber yet, the LEC will trench fiber into the building and install an OC3 mux...very expensive.

DS3's themselves are definately copper (Coax w/BNC connectors).

They commonly are brought in via a SONET Fibre system (aka. a single channel on an OC3/STS-1). Thus perhaps the confusion.

If you require more than 1 DS3, the provider will usually drop an OC3/OC12 SONET MUX/ADM on your premises; and mux the multiple DS3's into a SONET/OC3-OC12 signal for delivery into the Telco Metro Network.

However, "your" interface (i.e. your side of the DEMARC) is always Coax/BNC, one pair of coax (Tx/Rx) per DS3. The fact that the local telos may employ a SONET/Fibre facility is irrelevant to you for all intents and purposes.

The only Caveat to that, is if you *also* have your own SONET ADM/MUXing equipment. You could request 3 x DS3's, but ask that the Telco bring it in on a channelized OC3 (3 x STS-1's); and you would DEMUX the DS'3s from the SONET signal yourself.

This is what quite a few business do - for example they may have a bunch of Nortel OM3500 OC-48 Transport Nodes, and usually request their carriers to drop any leased DS3's to them on SONET APS 1+1 OC3/OC12 links; after which they can then run protected SONET/Fibre to their equipment.

These businesses would then Mux/Demux the DS3's themselves. However, the *all* still terminate as individual Coax/BNC connections on their own internal DSX-3 termination panel.

So....yes both copper and fiber are involved in obtaining a DS3. But the exact configuration is not as limiting as it may appear....and creativity in a final solution is definitely possible.

Michael is the owner of FreedomFire Communications....including DS3-Bandwidth.com and Business-VoIP-Solution.com. Michael also authors Broadband Nation where you're always welcome to drop in and catch up on the latest BroadBand news, tips, insights, and ramblings for the masses.

posted by streamyx-speedtest37082 @ 11:19 PM 0 comments

Gigabit Ethernet Applications-Is It A Fit For Your Organization?

In general 10 Gigabit Ethernet links are deployed in parts of an enterprise or service provider network where large numbers of Gigabit Ethernet links are being aggregated. This most commonly occurs in the network core, but as gigabit-to-the desktop deployments continue to grow the need for 10 Gigabit Ethernet uplinks from the network edge will emerge. Following are some common uses or applications for 10 Gigabit Ethernet.

Enterprise

As all enterprise applications converge on the common Ethernet backbone, the network must be able to gracefully support a new array of bandwidth hungry applications such as storage, backups and video. To effectively deal with this onslaught of bandwidth demand, forward-thinking network architects are designing enterprise networks with 10 Gigabit Ethernet to meet current and future needs.

Starting from the edge of the network, as gigabit-to-the-desktop deployments continue to grow, the need for 10 gigabit uplinks from a wiring closet switch to handle the performance demands of power users will emerge. Backbone links to entire floors or buildings may run over optical fibers at gigabit rates, while drops to desktop workstations may need to be no faster than 100 Mbps. Naturally, with this upsurge in bandwidth, demand 10 Gigabit Ethernet will be used as a high-speed interconnection between multiple buildings. These buildings could be in close proximity on a self-contained "campus", or could be many miles apart and be connected by dark fiber provided by a local service provider or municipality. Due to the limited distance of 10 Gigabit Ethernet on multimode fiber (MMF), singlemode fiber (SMF) must be deployed or leased to support 10 gigabit building interconnects.

In an enterprise data center, 10 Gigabit Ethernet can be used in a variety of applications such as cluster computing, server attachment and storage interconnect.

High Performance Cluster Computing (HPCC)

Server clusters are a group of tens, hundreds or even thousands of relatively inexpensive (e.g. 1U Linux servers) computers (referred to as nodes) connected in parallel to cooperatively solve large, complex problems. Cluster computing has become a mainstream technological tool for research, financial modeling, digital image rendering and scientific applications. The connection between the various computers in the cluster is typically an Ethernet switch.

Gigabit Ethernet Servers and NAS

As servers and Network Attached Storage (NAS) devices are attached to the edge of the network at 10 gigabit speeds, the network core will have to scale proportionally by link aggregating multiple 10 Gigabit Ethernet links or eventually with 40 Gigabit Ethernet. Network architecture must take into account meeting current Gigabit Ethernet and 10 Gigabit Ethernet server connectivity needs and scale upwards as the need for greater bandwidth inevitably emerges.

Storage Interconnect (iSCSI)

Fibre Channel has been the protocol of choice for storage area networking, however, with the emergence of the IETF (Internet Engineering Task Force) iSCSI protocol, Fibre Channels dominance is being challenged by IP/Ethernet. Simply put, iSCSI is an IP-based storage networking standard that facilitates data transfers by carrying SCSI (a protocol commonly used for communication between storage devices and computers) commands over IP networks. As iSCSI continues to gain in popularity, 10 Gigabit Ethernet links are the logical choice to carry the enormous volumes of data that traverse large corporate networks.

Given the extreme complex nature of designing an appropriate Gigabit Ethernet network architecture....and even deciding if it's right for your organization....it's strongly suggested that you not dump this whole animal on your IT staff. At a minimum....make use of free technical consultation for the bandwidth sourcing requirements from DS3-Bandwidth.com.

Michael is the owner of FreedomFire Communications....including DS3-Bandwidth.com and Business-VoIP-Solution.com Michael also authors Broadband Nation where you're always welcome to drop in and catch up on the latest BroadBand news, tips, insights, and ramblings for the masses.

posted by streamyx-speedtest37082 @ 6:00 AM 0 comments