Page 616 of 894 NT8D15 E&M Trunk card
553-3001-211 Standard 2.00 September 2004
Note: In Cabinet systems equipped with Meridian Mail, the Universal
Trunk line card cannot be installed in slot 10 of the main cabinet.
The NT8D15 E&M trunk card supports the following types of trunks:
• 2-wire E&M Type I signaling trunks
• two-wire dial repeating trunks
• two or four wire tie trunks
• 4-wire E&M trunks:
— Type I or Type II signaling
— duplex (DX) signaling
• paging (PAG) trunks
Type I signaling uses two signaling wires plus ground. Type II and DX
signaling uses two pairs of signaling wires. Most electronic switching
systems use Type II signaling.
Table 191 lists the signaling and trunk types supported by the NT8D15 E&M
trunk card.
Table 191
Trunk and signaling matrix
Signaling
Trunk types
RLM/RLR TIE PAG CSA/CAA/CAM
2-wire E&M Yes Yes Ye s Ye s
4-wire E&M Yes Yes No Ye s
Legend:
RLM Release Link Main
RLR Release Link Remote
CSA Common Control Switching Arrangement
CAA Common Control Switching Arrangement with Automatic Number Identification (ANI)
CAM Centralized Automatic Message Accounting (CAMA) trunk