I checked again; it's the Sierra Wireless MC5725 mini-PCI card as shown here.The actual modem of the "Sierra 595U CDMA Data Card" is actually a Sierra Wireless 5620(? don't quote me on that, I'm away from my desk right now) Mini-PCI card.
... but as it's becoming clear it either has a different or undefined reset/init/power sequence from the LTE mini-PCI that'll eventually be used, it doesn't appear to be useful for pre-release SW testing.
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