Direct Digital Interface - NEC NEAX 2400 ICS Features Manual

D-16
General Description
This service feature provides the capability to connect trunks from the NEAX2400 ICS directly to "T1"
carrier links via either private or public network.
Digital PBX
Traditional
Analog PBX
Operating Procedure
No manual operation is required.
Service Conditions
1. The DTI provides signalling interface, bipolar/unipolar conversion, frame synchronization,
insertion/extraction and alarm detection.
2. The Digital Interface Module can be provided with circuit cards to interface with "T1" carrier and/
or CCITT standard networks.
3. The Digital Interface Module (DTI) is mounted in a Port Interface Module (PIM).
4. The following two methods may be used for network synchronization.
5. Each office hierarchy is defined as follows:
a.) Master Office: One center will operate as the Master Office. This location has two highly
stabilized master oscillators, and distributes the Master Clock to all the systems through
the digital interface lines.
NEAX2400 ICS Business Features and Specifications
NDA-24143, Issue 4

Direct Digital Interface

Direct Digital Interface
Private Network: Connecting Digital Networks
DS-1 Signal Level
PCM Transmission Line
Office Line
Rep Rep
Private Network: Connecting Digital Networks
Office Line
Rep Rep
D3
Bank
(24 Channel)
Line
Rep
Line Office
Rep Rep
Office
Rep
Digital PBX
Traditional
D3
Analog PBX
Bank
D-16
Page 211