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Samsung DCS Application Note No 15 - Issue 01 Page 1 of 8
For Further Information Call LSP Communications
No. 15 August 1998
Topic E and M Tielines
Introduction
• E&M Tielines are used to connect systems using E&M signalling
• E&M tielines allow connection between systems supporting E&M tielines and may be used for
intercom calls, transferring calls and LCR applications
• E&M tieline ports can only be connected other E&M Tieline ports
• E&M tielines take trunk port positions and may be accessed using direct trunk selection, accessing
a trunk group with the E&M tielines assigned or using LCR
• When an E&M Tieline is selected, dial tone is heard from the other system and DTMF can be sent
to the receiving E&M Tieline port to access features such as internal calls or accessing a trunk on
the remote system
• The Samsung DCS and the Samsung DCS 70 provide the option of using a translation table to
interpret the incoming digits to the E&M Tieline port on the DCS. The translation table can be used
in conjunction with LCR.
• Each E&M tieline card has four ports
Note that a four wire E&M Tieline circuit has six wires associated with it. The numbering refers to the
number of wires used in speech circuits and not the E and M signalling wires.
Figure 1 Four Wire E&M Tieline Circuit as supported on Samsung DCS and DCS 70
Connecting two systems using E&M Tielines