Digium's dual span digital interface cards support 48 (T1 / J1) or 60 (E1) connections to PSTN trunks over two spans (digital circuits). Built exclusively for use with Asterisk and Asterisk-based communications systems, the dual span cards provide the best value in digital connectivity.

Dual span digital cards are available in PCI and PCI-Express form factors. All dual span models can be combined with an Octasic DSP-based echo cancellation module from Digium to provide effective hardware echo cancellation across all channels.


  1. Up to 24 (T1/J1) or 30 (E1) simultaneous calls
  2. Supports T1, E1 and J1 physical interface connections
  3. Optional 128ms hardware echo cancellation module
  4. Protocol support includes: ISDN PRI, Robbed-Bit, CAS
  5. Industry standard RJ-45 port
  6. Available in PCI and PCI Express form factors
  7. 2 ports / 2 spans
  8. 5-year warranty
  9. Digium ESP risk-free guarantee
  10. Asterisk and DAHDI supported (DAHDI 2.8 or later required for the TE235)
  11. Switchvox supported (Switchvox 5.8.1 or later required for the TE235)
Please click on the identified photos or here to learn more about Digium Cards. If you would like to obtain quotes or learn more about our wide array of products, services, and support, please e-mail us.