13-12 Sm artSwit ch 1800 4.0 U ser Gui de, Rev 01
The E&M types are described in Appendix C.
Interface
specifies (in conjunction with Telephony Interface Type) the type of interface that will
be used by the Voice channel. Valid selections are listed below:
Telephony Interface Type In terf ace
OPX (FXO) Loop Start
SLT (FXS) Loop Start
E&M 4W E&M, 4W E&M TE, 2W E&M, 2W E&M TE
AC15 AC15A or AC15C
Loop Start and OPX operating modes provide characteristics similar to those of a
central office. Loop Start and SLT operating modes provide cha racteristics similar to
those of a standa rd tel e phone set.
4W E&M is the normal setting for a PBX E&M tie-line interface that uses one pair of
wires for the incoming voice signal and another pair of wires for the outgoing voice
signal. 2W E&M is for an E&M tie line that uses a single pair of wires for both the
incoming and outgoing voice signal.
AC15A or AC15C are 4-wire signaling systems used by PBXs to communicate with
each other and other PBX-like communications equipment
2W E&M and 4W E&M can be configured in these modes, via the switches on the front
of the SmartSwitch:
●2W E&M or 4W E&M IS (Immediate Start), the industry standards for E&M oper-
ation.
●2W E&M or 4W E&M DD (Delay Dial), which will cause the SmartSwitch will
expect an attached PBX to raise its M-lead to request a dial register. The Smart-
Switch will respond as follows: 1) toggle the E-lead, 2) send a dial register to
the PBX, 3) return the E-lead to its original state, and 4 ) wait for dial digits from
the PBX (no dial tone is transmitted to the PBX).
●2W E&M or 4W E&M WS (Wink Start), which will cause the SmartSwitch will
expect an attached PBX to raise its M-lead to request a dial register. The Smart-
Switch will respond by sending a dial register to the PBX. When the PBX indi-
cates it is ready for dial digits (no dial tone is transmitted to the PBX), the
SmartSwitch will toggle the E-l ead. When the E-lead returns to its original state,
the PBX will transmit dial digits to the SmartSwitch.
2W E&M TE or 4W E&M TE (Timed E&M) are specified, you can specify a delay at
which the E-Lead follows the M-Lead (See TE Tim e r below).
Table 13-5 E&M Switch Settings
E&M
Type Voice Po rt 2
Sw. 8 Sw. 7 Sw. 6 Sw. 5 Voice Port 1
Sw. 4 Sw. 3 Sw. 2 Sw. 1
I UpUpDownDownUpUpDownDown
II Down Up Up Down Down Up Up Down
V UpDownUpUpUpDownUpUp