- Supports 
                DS1 Rate (24 Digital Channels) and E1 Rate (32 Digital Channels) 
                
 
              - All 
                versions support CO, TIE, DID and OPS (Off - Premises Stations) 
                port types using the robbed signal protocol, proprietary bit-oriented 
                signaling, (BOS) 24th channel signaling protocol, and the DMI-BOS 
                24th channel signaling protocol 
 
              - All 
                versions also support ISDN-PRI connectivity 
 
              - TN464E 
                and later provide test jack access to the DS1 or E1 line and support 
                the 120A Integrated CSU 
 
              - TN464F 
                and later suffix is required to communicate with Conversant 
 
                 
                 
                 
                 
               
             
            
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