March 2000
Intermediate to advanced
720 pages
20h 10m
English
Content preview from Understanding the Network: A Practical Guide to InternetworkingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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1000Base-X PHY Implementations
1000Base Ethernet (Gigabit Ethernet), for all intents and purposes, is 100Base Ethernet (Fast Ethernet) on steroids. Like 10Base and 100Base Ethernet, at the data link layer (OSI-RM Layer 2), the 1000Base implementation utilizes the "standard" IEEE 802.3 MAC frame format, making it completely backwards-compatible with pre-existing Ethernet implementations. To achieve this "compatibility," however, certain adjustments need to be made to the 1000Base Ethernet CSMA/CD mechanism in order to support segment lengths that could be useful, in light of the greatly reduced slot-time.
In terms of the physical layer (OSI-RM Layer 1), architecturally, 100Base and 1000Base Ethernet are similar. With the most obvious being the ...
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