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DIRECT DIGITAL INTERFACE
NEAX2000 IVS
2
Business/Hotel/Data Features and Specifications
NDA-24271, Issue 1.0
Page 139
DIRECT DIGITAL INTERFACE
General Description
This service feature provides the capability to connect trunks from the NEAX2000 IVS
2
directly to T1 carrier
links using either a private or public network.
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. Sub-Source office
This office operates using a Phase Lock Oscillator (PLO) to synchronize with the clock at the Source
Office. If the Source Clock fails, the Sub-Source office can operate using its own backup oscillator.
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 IVS
2
, the NEAX2400 IMX can function as a
Source office or Sub-Source office while the NEAX2000 IVS
2
functions as a Receiver and/or Local Receiv-
er office.
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 DS-1 signal level.
5. The DTI provides signalling interface, bipolar/unipolar conversion, frame synchronization, insertion/ex-
traction and alarm detection.
OFFICE
REP
LINE
REP
LINE
REP
OFFICE
REP
NEAX2000 IVS
2
Digital
PABX
DS-1 signal level
PCM transmission line
(24 channel)