SFP+ Connector Tone Signaling for Control Pin Reallocation
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Solution Overview
Problem
As data rate demands increase, there is a need to reassign some status and control pins in high-speed data connectors like SFP+ transceivers to high-speed data transmission, requiring alternative methods to utilize fewer pins effectively for control and status functionalities.
Innovation Solution
The solution involves generating distinct tones indicative of control or status signals and transmitting these tones over an additional contact adjacent to the standard contacts of an enhanced SFP+ connector, allowing for the reuse of pins previously dedicated to low-speed signaling for high-speed data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If status and control pins are re-assigned to high-speed data transmission, then high-speed data capacity increases, but control and status signaling capability deteriorates
Solution Approach 1:
The patent merges control and status signaling with high-speed data transmission by modulating these signals onto the same physical pins used for data transmission. The tone generator modulates control/status signals at distinct audio frequencies that are superimposed on the high-speed data lanes, allowing both functions to coexist on the same physical infrastructure.
Solution Approach 2:
The patent makes the data transmission pins multi-functional by enabling them to carry both high-speed data and control/status signals simultaneously. The same physical pins that transmit high-speed data also convey control and status information through audio-frequency modulation, eliminating the need for dedicated control pins.
2Productivity
If fewer pins are used for control and status signals, then more pins become available for high-speed data transmission, but signal integrity may deteriorate
Solution Approach 1:
The patent introduces a frequency dimension to the signal transmission by modulating control and status signals at distinct audio frequencies (e.g., 1kHz for control, 2kHz for status). This frequency-based separation allows multiple signals to coexist on the same physical medium without interference, maintaining signal integrity while increasing capacity.
Solution Approach 2:
The patent uses audio-frequency tones as intermediary carriers for control and status signals. These low-frequency modulations act as intermediaries that can be superimposed on high-speed data signals without causing interference, as they occupy different frequency spectrums and can be separated through frequency-based filtering.
Data Source
AI summary
An apparatus and method for signaling and transmitting data through an optical link is described. The apparatus may include a connector including a first plurality of contacts compatible with an enhanced SFP (SFP+) connector. The connector further includes an additional contact formed at a space adjacent to the first plurality of contacts. A tone generator couples to the additional contact to receive a first signal and to generate a first distinct tone indicative of the first signal for transmission via the additional contact. The method may include generating a first distinct tone indicative of a first signal providing control or status of an apparatus and transmitting or receiving a differential data signal over a portion of a first plurality of contacts compatible with an enhanced SFP (SFP+) connector. The first distinct tone is transmitted over the additional contact formed in a space adjacent to the first plurality of contacts.