|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||
Fiber Optic Cables We provide the largest variety of SingleMode jumpers and Multi Mode Fiber patch cords. Please call on us for
Fiber Optic Cables for Fast Ethernet, Fibre Channel, Infiniband, ATM and Gigabit Ethernet
More Fiber Optic Products:
 Simplex, duplex and multi-fiber Connectors: ST, FC, SC, MTRJ,
SMA, BICONIC, FDDI, ESCON, Mini BNC Pigtails, patch cords, hybrids Multi-fiber with pulling eyes Patch panels
We use manufacturers such as Corning, Lucent, AMP and others. Highlights:
Definitions: Fiber Optic cabling Single mode is an optical fiber, with a small core (2-9 microns that supports one mode). Mode size (standard ie 8.3/125) is stamped on the yellow cable jacket. Singlemode is used for high speed, long distance applications. Multimode is an optical fiber with a core (25-200 microns) that supports several modes. The core commonly 62.5/125 or 50/125 is stamped on the cable jacket. Multimode is used for lower speed, short distance applications. Simplex cable has a single fiber while Duplex has two fibers side by side. Types of Fiber. There are two basic types of fiber that are commonly deployed: multimode and single mode. Multimode fiber has a large core relative to a wavelength of light (~1.3 micron)--typically 62.5 microns. The relatively large size of multimode fiber means that light injected at one end of the fiber strand ends up bouncing along through the fiber, caroming off the cladding (the "walls" of the fiber optic "pipe"), and traveling many different paths to the other end of the fiber strand.
Fig. 1.: The elements of a multi-fiber fiber optic cable Given this relatively short permissible distance, why do sites bother using multimode fiber at all? First of all, multimode fiber was available before single mode fiber, so a lot of multimode fiber was installed where it was the only common option and gigabit speeds weren't on the horizon. Way back when, a couple of kilometers at fast Ethernet speeds probably sounded like more than enough "reach." Even today, multimode fiber continues to be installed in some circumstances because it is comparatively inexpensive and works fine over restricted distances (e.g., within a building), and because multimode transceivers (the devices that inject and receive light in fiber optic cables) tend to cost less than single mode transceivers. Where distances are longer, however, single mode fiber is the clear choice. Single mode fiber has a relatively thin core (typically 8-9 microns), thereby virtually eliminating modal dispersion problems. In the case of single mode fiber, the primary factor that serves to limit fiber reach is "attenuation," or loss of optical signal strength as the light passes through the fiber. Fiber Strand Count Requirements.
Now let's consider a different issue: fiber strand count. Just as it normally takes a pair of wires to deliver electricity, so, too, you'll normally need a pair of fibers to deliver network connectivity.
In many common network scenarios, however, you may find that you actually want more than two fibers, although in a pinch you can actually make do with only a single fiber. To understand why, you
need to develop a pessimistic "network engineering mindset," recognizing that any fiber you deploy will exhibit a perverse affinity for backhoes, brushfires, hungry rodents, and sundry other natural
disasters, all aimed at destroying your connectivity. The normal solution to this problem is to deploy fiber redundantly along two physically separate
routes, thereby insuring that if a backhoe cuts the pair of fibers you happen to be using, traffic will automatically reroute onto the backup ("protection") pair. Clearly, this is not a particularly elegant
solution nor a particularly cheap one, but if the circuit is crucial, or if it's running through remote areas where quick repairs would be difficult, it's routine to spend whatever it takes to get the required
backup circuit deployed, even though that may mean doubling (or more than doubling) the cost. Experience Cable Manufacturing at its Best |
We can build your cable assembly precisely to your specified fiber type, cable
length and connectors required.
| Medial Cables | Wire Harnesses | RF Cables | SAS Cables
| SATA Cables | HDMI Cables
| DVI Cables | Power Cords
| © Copyright 2007 CABLE MAN. All Rights Reserved |
