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SX-200 ICP MX Technician’s Handbook
Test/Verify (E&M)
• Loop back to self whenever more than 1 E&M type V circuit is
available.
• Verify far-end circuits by activating near-end M lead and listening for
far- end dial tone.
• Verify near-end circuits by activating near-end E lead and listening for
near-end dial tone.
• Verify that appropriate voltages are present on E&M leads in each call
state.
Stop Dial E lead goes active; goes
inactive when ready to go
—
Receipt of Digits Audible Tones - Busy,
Reorder, Ringback dependent
upon digits dialed and called
party condition
Audible Tones - Busy,
Reorder, Ringback
generated and sent to
calling party dependent
upon digits received and
called party condition
Answer
Supervision
E lead goes active M lead goes active
Disconnect
Supervision
Near-end termination:
M lead goes inactive;
E follows
Far-end termination:
E lead goes inactive;
M follows
Near-end termination: M
lead goes inactive;
E follows
Far-end termination:
E lead goes inactive;
M follows
Table 53: E&M Trunk Summary (continued)
Signal E&M Trunk PBX Outgoing
E&M Trunk PBX
Incoming
(Page 2 of 2)