Zhone Technologies IMACS-200 - Manual (Page 163)

E&M Ports 7-3
Figure 7-2 illustrates a Type II E&M signaling interface where the connecting equipment
(normally a PBX or other inter-office carrier systems) originates on the M-lead. The
connecting equipment provides a contact closure between the M and SB leads at the interface
to send an 0ff-hook (originate) and an open between the M and SB leads at the interface to
send an on-hook. The IMACS-200 provides a contact closure between the E and SG leads at
the interface to send on off-hook to the connecting equipment and an open between the E and
SG leads to send an on-hook
Figure 7-2.Type II E&M Signaling