Cabletron Systems SSIM-A8-01 Spezifikationen PDF herunterladen (Seite 11)

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Chapter 1

FDDI Application

FDDI provides speed and reliability to a LAN and is often used as a backbone technology as well as

a means of connecting high-speed computers in a local area. This chapter describes the views

available for the FDDI application.

ANSI developed the Fiber Data Distributed Interface (FDDI) as a standard for ﬁber-optic data

transmission. FDDI is a token-passing ring architecture that operates at 100 Mbps. In addition to

its transmission speed, other advantages of FDDI include the inherent noise immunity of ﬁber

optics, higher bandwidth, and longer transmission distance. Transmission by ﬁber also increases

security as ﬁber does not emit electrical signals that can be tapped. Unlike Ethernet (and, to a

certain extent, Token Ring), the FDDI network standard is fault tolerant by design due to a dual

counter rotating ring and optical bypass switches.

FDDI deﬁnes the use of two types of ﬁber: single mode and multimode. Single-mode ﬁber allows

only one beam of light to travel through the ﬁber, while multimode allows multiple beams. Single-

mode ﬁber generally uses lasers to generate the light, while multimode ﬁber uses light-emitting

diodes (LEDs).

SMT, Station Management, is required to provide the control necessary at the station level to

manage the processes underway in the various FDDI layers and to ensure that the station works

cooperatively with other stations on the ring. SMT provides many services, such as:

• Connection Management

• Station Insertion and Removal

• Conﬁguration Management

• Fault Isolation and Recovery

• Ring Scheduling

• Station Connection Statistics

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Cabletron Systems SSIM-A8-01 Spezifikationen Seite 11