NEC NEAX2000 IVS2 system manual 30DTI

CHAPTER 1 GENERAL INFORMATION

System Configuration

30DTI

The Digital Trunk Interface (DTI) interfaces the PBX directly to 30-channel PCM transmission line. The 30-DTI has the following functions.

•Unipolar/Bipolar Conversion (HDB3 Format)

•Signaling Insertion/Extraction

•Alarm Detection/Insertion

•Digital PAD on Voice Signal Transmission

•Cyclic Redundancy Checking (based on ITU-T Rec. G704)

•Channel Associated Signaling (based on ITU-T Rec. Q421 Digital R2 Signaling Code)

For connection of a 30-DTI and transmission line, either coaxial cable or twisted pair cable can be used.

DCH

The D Channel Handler (DCH) provides the D Channel signaling interface through the DTI to a Q-SIG network, and it is responsible for signaling between the PBX and the network under control of the system MP.

A DCH can control a maximum of 30 B Channels.

24DTI

The Digital Trunk Interface (DTI) interfaces the PBX directly to 24-channel PCM transmission line. The 24-DTI has the following functions.

•Unipolar/Bipolar Conversion (AMI Format)

•Alarm Detection/Insertion

•Digital PAD on Voice Signal Transmission

•Cyclic Redundancy Checking (based on ITU-T Rec. G704)

For connection of a 24-DTI and transmission line, a twisted pair cable can be used.

DCH

The D Channel Handler (DCH) provides the D Channel signaling interface through the DTI to a Q-SIG network, and it is responsible for signaling between the PBX and the network under control of the system MP.

A DCH can control a maximum of 23 B Channels.

Page 8	NEAX2000 IVS2 Q-SIG System Manual
	ND-70923 (E), Issue 1.0