E and m type ii signaling, Release control – Nortel Networks 1000 User Manual

Page 675

Operation

675

Table 246
Operation Mode

Operation mode

Start arrangement

Immediate start

IMM

Delay dial

DDL

Wink start

WNK

E and M Type II signaling

Figure 229 "E and M Type II signaling patterns - originating party release"
(page 677)

shows E and M Type II signaling patterns for incoming and

outgoing calls.

Figure 230 "E and M Type II signaling patterns - originating

party release on a tandem connection" (page 678)

shows 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. Since 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.

Release control

Release control of a call made over a trunk is specified in LD 16.
Disconnect supervision is specified for each trunk group independently.
The two options available are EITHER or ORIGINATING party control.
These can be specified for the end (near-end), or for the central office or
other PBX end (far-end). Joint party control can also be specified for the
far-end.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008