NEC 2400 PX Manuale Utente
NEAX2400 IPX Feature Programming Manual
Page 292
NDA-24297, Issue 1
D-16
Direct Digital Interface
D-16
Direct Digital Interface
General Description
This service feature provides the capability to connect trunks from the NEAX2400 IPX directly to “T1” carrier links
via either private or public network.
via either private or public network.
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.
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.
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:
a.) Source-Receiver System (Source)
b.) Source-Receiver System (Receiver)
b.) Source-Receiver System (Receiver)
5.
Each office hierarchy is defined as follows:
a.) Source Office: One center will operate as the Source Office. This location has two highly
stabilized source oscillators, and distributes the Source Clock to all the systems through the
digital interface lines.
digital interface lines.
Private Network: Connecting Digital Networks
Private Network: Connecting Digital Networks
DS-1 Signal Level
PCM Transmission Line
(24 Channel)
Office
Line
Line
Office
Rep
Rep
Rep
Rep
Digital PBX
Digital PBX
Traditional Analog
PBX
Traditional Analog
PBX
D3 Bank
D3 Bank
Office
Line
Line
Office
Rep
Rep
Rep
Rep