Can Anyone Share a Link or Copy of the GR-1244-CORE Standard?
The full document is proprietary, but you might be able to find summaries or relevant details in Technical whitepapers from timing hardware vendors (e.g., Microchip, Symmetricom/Microsemi, Oscilloquartz)
ITU-T Recommendations are also good place, as it mirror parts of GR-1244 (such as G.811/G.812/G.813)
Not to mention you can find good WSTS presentations, like this:
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