The Adtran Atlas 550 Quad T1/PRI Module provides four interfaces that are independently configurable for DS1, DSX-1, or PRI operation.
Features
Type: ISDN terminal adapter
Enclosure Type: Plug In Module
ISDN Interface: ISDN PRI T1
Line Rate: T-1
Digital Ports Qty: 4
Interfaces: 4 x modem - ISDN PRI T1