Nortel Networks 311 E and M Type II signaling, Release control

Operation 757

E and M Type II signaling

Figure 245 "E and M TypeII signaling patterns - originating par ty release"

(page 758) shows E and M TypeII signaling patterns for incoming and

outgoing calls. Figure 246 "E and M Type II signalingpatter ns - originating

party release on a tandem connection" (page 759) 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).

TypeII 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

TypeI 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, forecho

suppression, echo suppressor control cannot be used with TypeII signaling.

Note: M, SB, E, and SG designations are Electronic Industries

Association and TelecommunicationsIndustries Association (EIA/TIA)

conventions. These leads are also known as MB, MA, EA, and EB,

respectively.

Release control

Release control of a call made overa trunk is speciﬁed in LD 16. Disconnect

supervision is speciﬁed for each trunk group independently. The two options

available are EITHER or ORIGINATINGparty control. These can be

speciﬁed for the end (near-end), or for the central ofﬁceor other PBX end

(far-end). Joint party control can also be speciﬁed for the far-end.

Release control of a call made overa trunk is speciﬁed in LD 16. Disconnect

supervision is speciﬁed for each trunk group independently. The two options

available are EITHER or ORIGINATINGparty control. These can be

speciﬁed for the Meridian 1 end (near-end), or for the CO or other PBX end

(far-end). Joint party control can also be speciﬁed for the far-end.

Release control of a call made overa trunk is speciﬁed in LD 16. Disconnect

supervision is speciﬁed for each trunk group independently. The two options

available are EITHER or ORIGINATINGparty control. These can be

speciﬁed for the CS 1000 end (near-end), or for the CO 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 01.04 Standard

Release 5.0 23 May 2008