Avaya Nortel Communication Server 1000 Reference page 445

end of the seizure signal, the far-end can start pulsing after the standard delay
(normally 70 ms minimum).
- In delay dial mode, a 256-384 ms off hook/on hook signal is returned to the far-end
immediately after receipt of the seizure signal. When the far-end detects the on hook
signal (start signal), the far-end can start pulsing after the standard delay (normally
70 ms minimum).
- In wink start mode, within a 128–256 ms period after receipt of the seizure signal
from the far-end, the called office transmits a 250 ms, wink start, off hook/on hook
signal to the calling office.
Table 182: Operation Mode
Immediate start
Delay dial
Wink start
E and M Type II signaling
Figure 142: E and M Type II signaling patterns - originating party release
E and M Type II signaling patterns for incoming and outgoing
II signaling patterns - originating party release on a tandem connection
Type II signaling patterns for a tandem connection where the originating end is senderized and
the route is over a CO trunk (CCSA not applicable).
Type II signaling uses four leads: M, SB, E, and SG. Instead of changes of state between
battery and ground (M signals) or open and ground (E signals), the trunk signals by closing
the contacts between the lead pairs M and SB. Signals are received by detecting current flow
between lead pairs E and SG.
On incoming calls, the far end seizes the trunk by shorting the E and SG leads together. This
transmits the ground from the SG lead to the E lead (in Type I signaling the ground to the E
lead comes from the far-end). Dialing is done by opening and closing the E/SG contacts.
Because of the SB and M leads are also used as the ESCG and ESC leads, respectively, for
echo suppression, echo suppressor control cannot be used with Type II signaling.
Note:
M, SB, E, and SG designations are Electronic Industries Association and
Telecommunications Industries Association (EIA/TIA) conventions. These leads are also
known as MB, MA, EA, and EB, respectively.
Circuit Card Reference
Operation mode Start arrangement
IMM
DDL
WNK
calls.Figure 143: E and M Type
Operation
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