Increasing the number of available slots and performance of a system is
a desired goal in many communications market segments. Between exercising
the limits of physical backplane layouts and coaxing backplane transceivers
to their electrical limits, the achievable speeds to date have been less
than stellar. GTLP interface technology allows for an incident-wave
switched backplane that provides superior performance and slots over
previous, less capable technologies.
This paper will demonstrate how to implement GTLP in heavily-loaded
backplanes with optimized signal integrity. Issues discussed include proper
termination selection, the effects of stub lengths, impedance choices, and
related items. The results of both intensive simulations and actual
measurements will be presented, based on an actual case study.
The audience will benefit from this paper by learning how to extend the
capabilities of their GTLP designs. While the focus is achieving the
highest speed backplane possible with the maximum number of slots, this
must be done with good signal integrity, noise and timing margins in mind.
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