All Digium single span cards support connections with T1 (24-channel), E1 (32-channel), or J1 (24-channel) circuits. These industrial-grade cards utilizes Digium's VoiceBus™ technology. VoiceBus allows the TE122 to use an industry standard bus-mastering PCI interface to maximize system compatibility, eliminate system conflicts and provide outstanding voice quality. All single span digital cards may be combined with Digium's VPMOCT032 echo cancellation module to deliver 128ms of echo cancellation across 30 channels in E1 mode or 24 channels in T1 mode.

• Up to 24 (T1/J1) or 30 (E1) simultaneous calls
• Supports T1, E1 and J1 physical interface connections
• Uses Digium's VoiceBus™ technology for enhanced performance
• Optional 128ms hardware echo cancellation module
• Protocol support includes: ISDN PRI, Robbed-Bit, CAS, MFC/R2
• Industry standard RJ-45 port
• Available in PCI and PCI Express form factors