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H.100 and H.110 are nonproprietary switching fabric implementations developed by the ECTF (Enterprise Computer Telephony Forum). The standards are implemented in CT (computer telephony) systems. CT systems integrate voice, fax, and data networking as described under CTI (Computer-Telephony Integration) and other topics listed on the related entries page.

H.100 and H.110 defined what is required to implement a CT Bus on PCI and CompactPCI systems. H.100 is for PCI, a common bus for desktop computer systems. H.110 is for CompactPCI, which is PCI that has been "ruggedized" (a term used by the industry to refer to industrial-grade systems that can be moved around and withstand shocks). For more information on PCI and CompactPCI, see Switch Fabrics and Bus Design.

H.100/H.110 integrates TDM (time division multiplexing) with PCI and CompactPCI (cPCI) bus architectures. The TDM bus carries real-time voice and fax traffic is carried across a TDM bus that implements 4,096 bidirectional time slots (64 Kbits/sec each). The bus can support up to 2,048 full-duplex calls. H.110 is built right into the CompactPCI backplane, while H.100 is implemented as a ribbon cable connecting the different CT boards.

H.100 is defined in Dialogic's SCSA (Signal Computing System Architecture), which is a reference model for building open CT servers that can integrate multivendor CT applications and technologies. H.100 and H.110 are part of the low-level bus and hardware interface specifications.

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