"' Digital Data Communications Message Protocol "'( "'DDCMP "') is a asynchronous links and allowed errors introduced in transmission to be detected and corrected.
2.
The most common alternatives for SNA with SDLC were probably DECnet with Digital Data Communications Message Protocol ( DDCMP ), Burroughs Network Architecture ( BNA ) with Burroughs Data Link Control ( BDLC ), and ARPANET with IMPs.
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