T1 PRI and E1 PRI

           The Primary Rate Interface (PRI) is a standardized telecommunications service level within the Integrated Services Digital Network (ISDN) specification for carrying multiple DS0 voice and data transmissions between a network and a user.

          PRI is the standard for providing telecommunication services to offices. It is based on the T-carrier (T1) line in the US and Canada, and the E-carrier (E1) line in Europe. The T1 line consists of 24 channels, while an E1 has 32.         

■ T1 PRI card with a DSX1 electrical interface supporting 23 bearer channels and 
one signaling channel (23B+D). The T1 interface is used in Japan and North 
America.
■ E1 PRI card with a G.703 electrical interface supporting 30 bearer channels and 
one signaling channel (30B+D). The E1 interface is used outside of Japan and 
North America. 

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