October 2002
Intermediate to advanced
1280 pages
24h 35m
English
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General
Some general physical characteristics of the physical link are:
2.5Gb/s (wire speed).
A link is a point-to-point connection between ports on two devices.
A link can have 1x, 4x, or 12x “data lanes.” Each data lane consists of a transmit wire and a receive wire.
In a multi-lane implementation, the data is byte-striped across the lanes.
The link is a dual-simplex (i.e., full-duplex) connection permitting simultaneous data transmission in both directions.
Data is transmitted over a transmit signal pair and received over a receive signal pair.
There is no carrier sense or collision detect (as in Ethernet).
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