Digium 1TE235F Two Span Digital T1/E1/J1/PRI PCI-Express X1 Card Up to 24 (T1/J1) or 30 (E1) simultaneous calls per span (48 total T1/J1 and 60 total E1 calls per card) Supports T1, E1 and J1 physical interface connections Protocol support includes: ISDN PRI, Robbed-Bit, CAS Industry standard RJ-45 port Asterisk and DAHDI supported (DAHDI 2.8 or later required for the TE235)