From Fibre Channel for SANs


The FC-0 level is the physical link layer in the Fibre Channel architecture. Although its characteristics are well suited to optical fiber implementation, it is designed for maximum flexibility and allows use of several electrical technologies as well. Data transfer interfaces are defined for optical transmission over both single- and multi-mode fibers, with both lasers and LEDs, at both long (1300 1360 nm) and short (770 850 nm) wavelengths, and for electrical transmission over video coax, miniature coax, and shielded twisted pair cables. Transmission speeds are defined at 1.0625 Gbps, at half-, quarter-, and eighth-speed data rates, and recently at double- (2.125 Gbps) and quadruple-speed rates as well. This variety of possible technologies makes for a large range of customer and manufacturer choices regarding transmission medium, transmission distance, and price.

General Characteristics

The FC-0 level converts 10-bit transmission characters at a transmitting Port into serialized transmission signals that traverse a cable plant to a receiving Port. A cable plant consists of optical fibers or electrical cables with associated connectors and/or splices for optical fibers and grounding mechanisms for electrical cables. The FC-0 level at the receiving Port digitizes and deserializes the received signal into retimed 10-bit characters to be passed to the receiving Port s FC-1 level.

The transmission signal is binary, with a two-state transmission signal. A digital b 1 is encoded relative to b 0 as either more optical power (optical fiber) or a higher voltage on the center conductor (coaxial cable) or higher voltage on the conductor labeled + (twisted pair...

Products & Services
Optical Fiber Identifiers
Optical fiber identifiers are designed to non-invasively identify continuous-wave signals in fiber optic cables. They are low cost, hand-held tools that identify signals in single-mode fiber without interrupting service or damaging the fiber.
Network Wiring and Cabling Services
Network wiring and network cabling services install copper and fiber optic cable within buildings or central offices.
Patch Cables and Cords
Patch cables and cords are flexible cables that are terminated at both ends with a plug and used to interconnect circuits on patch panels. They are used with patch panels, groups of ports that connect lines between communications and electronic devices.
Fiber Optic Rotary Joints
Fiber optic rotary joints (FORJ) are the optical equivalent of electrical slip rings. They enable uninterrupted transmission of an optical signal while rotating along the fiber axis.

Topics of Interest

Introduction This chapter covers the design of the 8B/10B transmission code used for Fibre Channel transmission, and the transmitter and receiver states. 8B/10B Transmission Code Overview When data...

Absorption: The portion of optical attenuation in an optical fiber resulting from the conversion of optical power to heat; caused by impurities such as hydroxyl ions in the fiber. A/B Switch: A...

3.9   GIGABIT ETHERNET The Gigabit Ethernet (1000BASE-x), or GbE for short, is the natural evolution of two older standards, the 100 Mbit Ethernet (100BASE-x) and the 10 Mbit Ethernet (10BASE-T).

Introduction This chapter provides an overview of the general structure, concepts, organization, and mechanisms of the Fibre Channel protocol. This will provide a background for the detailed...

Exam Essentials List the main considerations when designing a basic fiber optic system. Remember that there are many ways to approach fiber optic system design and there are many different fiber optic...