HP ProLiant BL660c Electrical signal integrity considerations for HP BladeSyst - Page 2
Introduction, What is signal integrity
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Introduction A requirement for any server architecture is that it continues to meet future customer needs by supporting a built in capability to provide sustained high performance as technology driven bandwidth enhancements become available. The BladeSystem c-Class enclosures (c3000, c7000) are architected to ensure that they can support upcoming technologies and increasing demand for bandwidth and power for at least 5 to 7 years. This technology brief discusses the effort to design, model, standardize, and document the electrical requirements for the high-speed interfaces of the HP BladeSystem. This applies to all HP BladeSystem switch modules, mezzanine cards, server blades, and midplanes that use the high-speed interface. What is signal integrity Signal integrity engineering ensures that electronic circuits communicate reliably in the presence of channel impairments. Over short distances and at low bit rates, a simple conductor can easily transmit a signal from point A to point B with good fidelity (Figure 1). Figure 1. Lossy signal line depiction over short distances and low bit rates However, at high bit rates and over longer distances, various effects can degrade the electrical signal to the point where data transmission errors occur, resulting in a system malfunction (Figure 2). Figure 2. Lossy signal line depiction over longer distances and higher bit rates 2