Specifications

Line and Station Boards and Special Components
GCA39-825 Rev 2, Issue 4/02 Page 4 Printed in the USA
Direct Inward Dial and E & M Tie Line Board
Part Number: FXEMDD-DF (8 Port DID and 2 Port E & M Tie Line)
• The DID/E&M line is a reverse battery, loop start, two-wire voice circuit.
• Direct Inward Dial (DID) lines are incoming only. They allow you to dial an internal
extension directly without going through an attendant.
Each extension on the telephone system can have its own published outside telephone
number without having a dedicated line.
• An E & M tie line is a dedicated circuit linking 2 systems. An E & M tie line may be
accessed by lifting the telephone handset (ring down circuit), dialing an access code on the
intercom, or by pressing a pre-programmed button.
E & M tie lines provide a user with local intercom dial tone from the remote system.
If the tie line goes outside the premises, it is necessary to protect the line with a long loop
adapter and surge protection.