RJ45 jack seemed to be loose on each module causing poor connections and was the source of intermittent data loss.
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Product details
The SparkFun QwiicBus EndPoint is the fastest and easiest way to extend the range of your I2C communication bus. The breakout uses NXP’s PCA9615 IC, which converts the two default I2C signals into four differential signals, two for SCL and two for SDA. The differential signals are sent over an Ethernet cable, which attaches to the breakout through the on-board RJ-45 connectors. The differential signaling allows the I2C signals to reach distances of up to 100ft. while still maintaining their signal integrity! To make it even easier to get your readings, all communication is enacted exclusively via I2C, utilizing our handy Qwiic system so no soldering is required to connect it to the rest of your system. However, we still have broken out 0.1"-spaced pins in case you prefer to use a breadboard. The simplicity of the QwiicBus EndPoint is one of its biggest appeals. Other I2C communication methods require packetizing I2C communication into another protocol, be it RS-485 or 1-Wire. However, the PCA9615 keeps the I2C protocol by utilizing a differential transceiver. This updated version of the Differential I2C Breakout adds two 0.1" spaced pins connected to the unused pair of wires on the RJ-45 connectors so users can easily take advantage of the unused pair for whatever they would like. Whether you need to extend the range of an I2C sensor on an autonomous vehicle plagued with noise from motors or want to create a vast sensor network in your home or office, the QwiicBus EndPoint is a great solution to extend distance and reduce noise susceptibility. The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong. Get Started with the SparkFun QwiicBus Guide
All reviews
I tried to extend an OLED on a 15 foot ethernet cable to no success. There is no help from Sparkfun except for the community. Someone responded to my request for help that seemed from the title was a SparkFun employee [not sure], with a statement about how odd it was to try to extend an OLED display or something similar. I finally had to abandon the Endpoint system and move to ESPNow setup, which works well and is less expansive. By the way - I read the documentation for this which I found confusing with limited examples of wiring, for example. Not trying to be a jerk about it - just explaining my situation in case it helps with informing someone else about how to do the project.