DIRECT DIGITAL INTERFACE
DIRECT DIGITAL INTERFACE
General Description
This service feature provides the capability to connect trunks from the NEAX2000 IVS2 directly to T1 carrier links using either a private or public network.
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| PCM transmission line |
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| (24 channel) |
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NEAX2000 IVS2 |
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| Digital |
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| PABX |
OFFICE | LINE | LINE | OFFICE |
REP | REP | REP | REP |
Operating Procedure
No manual operation is required.
Service Conditions
1.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.
b.
This office operates using a Phase Lock Oscillator (PLO) to synchronize with the clock at the Source Office. If the Source Clock fails, the
c.Receiver office
This office is arranged so it will have at least two clock routes, one for Source and the other for standby. Synchronization Clock is derived from incoming PCM bit stream from higher hierarchy offices.
d.Local Receiver office
This is the end office in a digital network arrangement. This office will not be provided with a backup route for the PLO because this office is the only one influenced in the event of trouble occurrence.
2.When a digital network is implemented using the NEAX2000 IVS2, the NEAX2400 IMX can function as a Source office or
3.Each digital office is equipped with a PLO used for network synchronization. Clocks from the Source Os- cillator or Digital Interface Package should be connected to inputs on each PLO.
4.D3 Channel Banks are not required since the switch can be equipped with a Digital Trunk Interface (DTI) compatible with
5.The DTI provides signalling interface, bipolar/unipolar conversion, frame synchronization, insertion/ex- traction and alarm detection.
NEAX2000 IVS2 |
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Business/Hotel/Data Features and Specifications | Page 139 |
