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Interface device on the PCM Expansion Bus (PEB) or SCbus and the Network external interface to network circuits that meet either the T-1 or E-1 telephony standard. NOTE: The DTI/211 and DTI/212 boards operate on the PCM Expansion Bus (PEB). The DTI/2xx boards are not SCbus compatible. The Network library of C functions also supports DTI/101 boards.
PEB - PCM Expansion Bus (digital voice bus) | AcronymFinder
US5212688A - TDM expansion bus - Google Patents