Download Open System LANs and their Global Interconnection. by Jack Houldsworth PDF

By Jack Houldsworth

This can be a "source booklet" on neighborhood quarter Networks (LANs) expertise with the most emphasis on Open method Interconnection (OSI) criteria. It includes entire details on all points of LAN structures from copper and fibre wiring to the media entry keep an eye on platforms for Ethernet (CSMA/MD), token ring, token bus, slotted ring and FDDI LAN applied sciences

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Extra info for Open System LANs and their Global Interconnection. Electronics and Communications Reference Series

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A bridge is thus a bidirectional device which allows traffic to flow between two LANs. Note that the bridged LANs must be operating the same higher layer protocols otherwise it becomes necessary for the device to also carry out protocol conversions. In such a case it is no longer termed a bridge but is known as a router or a gateway. A MAC device must wait for its turn or opportunity to access the medium, therefore a bridge must be a store and forward device capable of queueing frames until it gets the opportunity to transmit them successfully.

In this case the devices are termed remote bridges. A bridge is thus a bidirectional device which allows traffic to flow between two LANs. Note that the bridged LANs must be operating the same higher layer protocols otherwise it becomes necessary for the device to also carry out protocol conversions. In such a case it is no longer termed a bridge but is known as a router or a gateway. A MAC device must wait for its turn or opportunity to access the medium, therefore a bridge must be a store and forward device capable of queueing frames until it gets the opportunity to transmit them successfully.

3 shows the wavelength vs attenuation characteristic of a typical fibre. 3 Wavelength vs attenuation for a typical fibre. 75 dB/km at this wavelength. Light Emitting Diodes (LEDs) at 850 nm are inexpensive but they cannot easily be made to operate at a high Baud rate. The IEEE family of LANs currently use first window transmission. 5 dB/km. Higher bandwidth LEDs are possible but are more expensive. FDDI uses second window transmission. 0 dB/km. This window is used by laser diode based monomode systems and has not found its way into LANs in other than specialised long distance links.

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