Digium's single span digital interface cards support 24 (T1 / J1) or 30 (E1) connections to PSTN trunks over a single circuit. These industrial-grade cards utilizes Digium's VoiceBus™ technology to maximize system compatibility, eliminate system conflicts and provide outstanding voice quality.

Single span cards are available in PCI and PCI-Express form factor.  All single span models be combined with Digium's VPMOCT032 echo cancellation module to provide echo cancellation across all channels.

Digium cards are compatible with all versions of Asterisk using the DAHDi driver framework.  Asterisk and DAHDi are available for free from the Asterisk.org website. All cards include a five (5) year warranty and are eligibile for Digium's no-risk ESP guarantee.

(Image shown with echo cancellation module)