NEC NEAX 2400 ICS User manual

ND-45383 (E)
ISSUE CD 1.0
STOCK # 200716
DRU System Manual
JANUARY, 1996
NECAmerica,Inc.
®

LIABILITY DISCLAIMER
NEC America, Inc. reserves the right to change the specifications,
functions, or features, at any time, without notice.
NEC America, Inc. has prepared this document for use by its em-
ployees and customers. The information contained herein is the
property of NEC America, Inc. and shall not be reproduced without
prior written approval from NEC America, Inc.
NEAX and Dterm are registered trademarks of NEC Corporation.
Copyright 1996
NEC America, Inc.
Printed in USA

ND-45383 (E)
ISSUE CD 1.0
JANUARY, 1996
NEAX2400 IMS
DRU System Manual
TABLE OF CONTENTS
Page
ND-45383 (E) TABLE OF CONTENTS
Page i
Revision CD 1.0
LIST OF FIGURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iv
LIST OF TABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
REGULATORY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
CHAPTER 1 INTRODUCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Configuration of the DRU System Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Related Reference Manuals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
CHAPTER 2 GENERAL INFORMATION FOR DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. SYSTEM OUTLINE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Purpose of the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Features of the DRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. DESCRIPTION OF SYSTEM COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 DRU (Digital Remote Unit). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.1 Outer View of the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.2 Type of DRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.3 How to Install the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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3.1.4 Specifications of the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.5 Circuit Cards in the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Batteries (Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.1 How to Mount the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.2 Specifications of the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Functions of Circuit Cards for the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.1 Required Circuit Cards for the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.2 Functions of Circuit Cards for the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4. DATA PROGRAMMING PLAN FOR DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.1 Relationship between Each Circuit on the DLI Card and LENS. . . . . . . . . . . . . . . . . . . . . . 23
5. LOOP-BACK FUNCTION TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Local Loop-Back Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2 Remote Loop-Back Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.3 Remote Loop-Back. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
CHAPTER 3 INSTALLATION PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2. PRECAUTIONS ON INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3. INSTALLATION PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.1 Marking and Drilling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.1.1 When Mounting the DRU on the Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

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3.1.2 When Installing the DRU on the Floor Using Stand Assembly (STAND ASSEM)
(Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
3.2 Installation of the DRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.2.1 When Mounting the DRU on the Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.2.2 When Installing the DRU on the Floor Using Stand Assembly (STAND ASSEM)
(Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.2.3 When Mounting the DRU on the 19-inch Rack (Option) . . . . . . . . . . . . . . . . . . . . . . 40
3.3 Confirmation of Power Cable of the DRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.4 Mounting of the Battery (Option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.4.1 When Mounting the Battery within the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.4.2 When Mounting the Battery Externally. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.5 Switch Setting of the DRE Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
3.5.1 Switch Setting Sheet of DRE Card in DRU-30-A . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.5.2 Switch Setting Sheet of DRE Card in DRU-23-S3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
3.5.3 Switch Setting Sheet of DRE Card in DRU-30-S3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
3.6 Setting of Switch Positions and Mounting of the DLI Card . . . . . . . . . . . . . . . . . . . . . . . . . 66
3.6.1 PA-DAIA Card Switch Setting Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
3.6.2 PA-2DAID Card Switch Setting Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
3.6.3 PA-DAIC Card Switch Setting Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
3.7 Cable Termination and Cross Connection from the MDF to the DRU and from the DRU
to the Dterm/Analog PB TEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
3.7.1 Cable Termination and Cross Connection from the MDF to the DRU . . . . . . . . . . . 92

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3.7.2 Cross Connections for Digital Interface (When remotely installing the
DRU-23-S3 by Digital Interface). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
3.7.3 Cable Termination and Cross Connection from the DRU-30-A/DRU-30-S3 to the
Analog PB TEL/Dterm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
3.7.4 Cable Termination and Cross Connection from the DRU-23-S3 to the Dterm . . . . 105
3.8 Cleaning and Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
CHAPTER 4 INSTALLATION TEST PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
2. INSTALLATION TEST PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
2.1 Start-up of the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
2.2 Check of Lamp Indications and System Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
2.3 Check of Loop-Back Test Execution Required/Not Required . . . . . . . . . . . . . . . . . . . . . . 112
2.4 Check of Battery Operation when Power Supply Failure to the DRU . . . . . . . . . . . . . . . . 113
3. MOUNTING OF COVER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
CHAPTER 5 MAINTENANCE PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
1. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
2. SYSTEM MESSAGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
2.1 Technical Terms for Explaining Message Detail Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
2.1.1 Circuit Card Location Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
2.2 How to Proceed with Diagnostic Work from System Message . . . . . . . . . . . . . . . . . . . . . 120
2.3 System Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

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3. FAULT DIAGNOSIS BY LOOP-BACK TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
3.1 Loop-Back Diagnosis from the DLI to the DRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
3.1.1 Procedure for Loop-Back Diagnosis from the DLI to the DRU. . . . . . . . . . . . . . . . 129
3.2 Loop-Back Diagnosis between the DLI and the Transmission Equipment. . . . . . . . . . . . 131
3.2.1 Procedure for Loop-Back Diagnosis between the DLI and the
Transmission Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
3.3 Loop-Back Diagnosis between the DRU and the Transmission Equipment. . . . . . . . . . . 134
3.3.1 Procedure for Loop-Back Diagnosis between the DRU and the
Transmission Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
4. FAULT REPAIR PROCEDURE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
4.1 DLI Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
4.2 DRU Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
4.3 Battery Fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

LIST OF FIGURES ND-45383 (E)
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Figure Page
Figure 2-1 Outline of NEAX2400 IMS when the DRU is used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 2-2 Outer View of the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2-3 Example of Installation of the DRU (Wall Mounting). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2-4 Example of Installation of the DRU (Floor Installation using STAND ASSEM) (Option) . 7
Figure 2-5 Example of Installation of the DRU (Mounting on the 19-inch rack) (Option) . . . . . . . . . 8
Figure 2-6 Outer View of DRE Card in DRU-30-A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 2-7 Outer View of DRE Card in DRU-23-S3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 2-8 Outer View of DRE Card in DRU-30-S3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 2-9 Mounting Location of DLI Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 2-10 Front View of PA-DAIA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 2-11 Front View of PA-DAIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 2-12 Mounting Location of 2DLI Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 2-13 Front View of PA-2DAID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 2-14 Local Loop-Back Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 2-15 Remote Loop-Back Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 2-16 Remote Loop-Back. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 3-1 Static Caution Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 3-2 3M Model 8012 Portable Field Service Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 3-3 Marking for Mounting the DRU on the Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 3-4 Drilling for Mounting the DRU on the Concrete Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 3-5 Drilling for Mounting the DRU on the Wooden Wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 3-6 Marking for the STAND ASSEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

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Figure 3-7 Drilling for Setting the STAND ASSEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 3-8 Fastening of the STAND ASSEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 3-9 Remove the DRU Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 3-10 Installation of the DRU (Wall Mounting) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 3-11 Installation of the DRU (Floor Installation by the STAND ASSEM) . . . . . . . . . . . . . . . . . 39
Figure 3-12 Installation of the DRU (When Mounting 4 Sets of DRU onto the 19-inch Rack) . . . . . . 40
Figure 3-13 Installation of the DRU (When Mounting 3 Sets of DRU onto the 19-inch Rack) . . . . . . 41
Figure 3-14 Confirmation of Short Piece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 3-15 Battery Connection (When Mounting the Battery within the DRU) . . . . . . . . . . . . . . . . . 43
Figure 3-16 Battery Cable Connection (When Mounting the Battery within the DRU). . . . . . . . . . . . 44
Figure 3-17 Battery Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 3-18 Battery Cable Connection (When Mounting the Battery Externally) . . . . . . . . . . . . . . . . 46
Figure 3-19 Circuit Card Mounting (Partial Insertion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Figure 3-20 Connection of DRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Figure 3-21 “LT” Connector Pin Accommodation for the DLI Mounted in PIMA . . . . . . . . . . . . . . . . 94
Figure 3-22 “LT” Connector Pin Accommodation for the DLI Mounted in PIMB . . . . . . . . . . . . . . . . 95
Figure 3-23 “LT” Connector Pin Accommodation for the 2DLI Mounted in PIMB (1/2) . . . . . . . . . . . 96
Figure 3-23 “LT” Connector Pin Accommodation for the 2DLI Mounted in PIMB (2/2) . . . . . . . . . . . 97
Figure 3-24 Connection of Digital Interface for IMG (ICS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Figure 3-25 Connection of Digital Interface for MMG (ICS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Figure 3-26 Connection of Analog PB TEL/Dterm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Figure 3-27 Details of Analog PB TEL Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

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Figure 3-28 Details of Dterm Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Figure 3-29 “CHAMP” Connector Pin Accommodation for DRU-30-A/DRU-30-S3. . . . . . . . . . . . . . 104
Figure 3-30 Connection of Dterm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Figure 3-31 “CHAMP” Connector Pin Accommodation for DRU-23-S3. . . . . . . . . . . . . . . . . . . . . . . 106
Figure 4-1 Mounting of the DRU Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Figure 5-1 Relation between Accommodated Location Information and Mounting Location. . . . 117
Figure 5-2 Example of Diagnostic Work Items and Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

LIST OF TABLES ND-45383 (E)
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LIST OF TABLES
Table Page
Table 1-1 Configuration of the DRU System Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 1-2 Related Reference Manuals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Table 2-1 Specifications of the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 2-2 Specifications of Interface between NEAX2400 IMS and the DRU . . . . . . . . . . . . . . . . . . 9
Table 2-3 DRE Card Lamp Indication Reference Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 2-4 Specifications of the Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 2-5 PA-DAIA Lamp Indication Reference Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 2-6 PA-DAIC Lamp Indication Reference Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 2-7 PA-2DAID Lamp Indication Reference Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 2-8 Relationship between Each Circuit on the DLI and LENS . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 5-1 System Messages for the DRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

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CHAPTER 1 INTRODUCTION
1. GENERAL
This manual describes the outline of the functions, installation procedure and maintenance, etc. of the DRU
(Digital Remote Unit). How to use this manual is described in Section 2: “HOW TO FOLLOW THE MANU-
AL” in this chapter. Be sure to read it before continuing.
1.1 Configuration of the DRU System Manual
The configuration of this manual is shown in Table 1-1.
Table 1-1 Configuration of the DRU System Manual
CHAPTER TITLE CONTENTS
2 GENERAL INFORMATION
FOR DRU This chapter explains the outline of the functions of the DRU, the hard- ware required for using the DRU and testing of the DRU circuit func-
tions.
3 INSTALLATION
PROCEDURE This chapter explains the procedure for installation of the DRU.
4 INSTALLATION TEST PRO-
CEDURE This chapter explains the procedure for installation tests of the DRU.
5 MAINTENANCE
PROCEDURE This chapter explains the procedure for maintenance of the DRU.

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1.2 Related Reference Manuals
This manual describes only items related to DRU. For detailed explanations on the NEAX2400 IMS as a
whole, maintenance procedures and installing various kinds of terminal equipment, refer to the manuals
shown in Table 1-2.
Table 1-2 Related Reference Manuals
MANUAL DESCRIPTION
NEAX2400 IMS Installation
Procedure Manual The Installation Procedure Manual describes the procedure for the following opera- tions:
• The installation procedure of the system equipment including the Module
Group, Maintenance Administration Terminal, Attendant Console, terminal
equipment, etc.
• The procedure for starting up the system by turning on the operating power.
• The testing procedures used to verify that each system feature operates ac-
cording to the assigned office data.
NEAX2400 IMS System Opera-
tions Manual The System Operations Manual explains the system administrative functions and con- trol methods, etc. required for normal system operation.
NEAX2400 IMS System Main-
tenance Manual The System Maintenance Manual explains the procedures to be used to maintain the normal operating state of the system, and the remedial actions to be taken or the oper-
ating procedures used when a malfunction occurs within the system.
NEAX2400 IMS Circuit Card
Manual The Circuit Card Manual explains the functional outline, mounting locations, lamp in- dications, switch setting and external interface of the circuit cards used in the
NEAX2400 IMS.

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CHAPTER 2 GENERAL INFORMATION FOR DRU
1. GENERAL
This chapter explains the outline of the functions of the DRU, the system components, and loop-back test func-
tions.
2. SYSTEM OUTLINE
2.1 Purpose of the DRU
The DRU is a system which extends and decentralizes the Line Circuits (LC/DLC/ELC), which have so far
been accommodated in the PIM of the NEAX2400 IMS, using the digital line interface. Figure 2-1 shows
the outline of the NEAX2400 IMS when the DRU is used.
Figure 2-1 Outline of NEAX2400 IMS when the DRU is used
123 RECALL
45 6 PNC
78 9 CNF
∗
0
#
LINE
/SPD
HOLD TRF ANS SPKR
D
term
D
term
Max.
23 or 30
D
terms
•
•
•
DRU
NEAX2400 IMS
DRU
1 2 3
RECALL
456PNC
789CNF
∗
0
#
LINE
/SPD
HOLD TRF ANS SPKR
Analog PB TEL
1 2 3
RECALL
4 5 6 PNC
7 8 9 CNF
∗
0
#
LINE
/SPD
HOLD TRF ANS SPKR
Analog PB TEL
•
•
•
Max. 30
Analog PB TELs
Analog PB TEL
D
term
1-Pair Cable
1-Pair Cable
2-Pair Cable
2-Pair Cable

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2.2 Features of the DRU
The DRU has the following features.
• In the case of the conventional NEAX2400 IMS, cables for connecting the Dterms to the system are re-
quired as many as the number of Dterms/Analog PB TELs. However,use of the DRU enables maximum
23 or 30 Dterms/30 Analog PB TELs can be connected to the system by means of 2-pair cables and thus
the number of the cables for Dterm/Analog PB TEL can be reduced.
• Even when the system is installed in a wide area such as a factory, a university premises, etc., the dis-
tance between the NEAX2400 IMS and the DRU can be extended using digital line.
• As one set of the DRU can be connected to maximum 23 or 30 Dterms/30 Analog PB TELs, when in-
creasing the number of Dterms/Analog PB TELs, installation work is required only between the DRU
and Dterms/Analog PB TELs and no installation work is required between the NEAX2400 IMS and the
DRU.

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3. DESCRIPTION OF SYSTEM COMPONENTS
This section explains the following system components of the DRU.
• DRU (Digital Remote Unit)
• Batteries
• Functions of Circuit Cards for the DRU
3.1 DRU (Digital Remote Unit)
3.1.1 Outer View of the DRU
Figure 2-2 shows the outer view of the DRU.
Figure 2-2 Outer View of the DRU
3.1.2 Type of DRU
DRU is available in following three types:
• DRU 30-A
This DRU is capable of connecting a maximum 30 sets of analog PB telephone.
• DRU-23-S3
This DRU is capable of connecting a maximum 23 sets of Dterm.
• DRU-30-S3
This DRU is capable of connecting a maximum 30 sets of Dterm.
NEC
Digital Remote Unit
350
60 430
(1' 4 ")
9
10
(1' 1 ")
4
5
(2 ")
2
5
Unit: mm (inch)

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3.1.3 How to Install the DRU
The DRU can be installed by one of the following methods.
• Mounting on the wall.
• Installing on the floor using the stand assembly (STAND ASSEM) (Option).
• Installing plural sets of the DRU at one location using the 19-inch rack (Option).
Figures 2-3 through 2-5 show examples of installation of the DRU.
Figure 2-3 Example of Installation of the DRU (Wall Mounting)
DRU
Wall
DRU
Wall
BATT BOX
ASSEM
Note: The external battery and the BATT BOX ASSEM must be locally provided.
• When the battery is set inside the DRU
• When the battery is installed externally

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Figure 2-4 Example of Installation of the DRU (Floor Installation using STAND ASSEM) (Option)
DRU
BATT BOX
ASSEM
DRU
STAND ASSEM STAND ASSEM
Note: The external battery and the BATT BOX ASSEM must be locally provided.
• When the battery is set inside the DRU • When the battery is installed externally

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Figure 2-5 Example of Installation of the DRU (Mounting on the 19-inch rack) (Option)
DRU
DRU
DRU
DRU
BATT BOX
UNIT (Special)
DRU
DRU
DRU
19-inch Rack
(IEC Spec.)
BATT BOX
ASSEM (Standard)
• When installing 4 sets of DRU • When installing 3 sets of DRU
Note 1: The 19-inch rack should be provided by the installer.
Note 2: The external battery and the BATT BOX ASSEM must be locally provided.

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3.1.4 Specifications of the DRU
Table 2-1 and 2-2 show specifications pertaining to the DRU.
Table 2-1 Specifications of the DRU
ITEM SPECIFICATIONS
DRU-30-A DRU-30-S3 DRU-23-S3
Number of Circuits 30 circuits ELC Mode DLC Mode ELC Mode DLC Mode
Voice 30 circuits
Data None Voice15 circuits Data15 circuits Voice23 circuits Data None Voice 12 circuits Data 11 circuits
Connectable
Terminal Analog PB TEL (One TEL per
analog port max)
2W Dterm (Dterm Series III) 2W Dterm (Dterm Series III)
Distance between
the DRU and Analog
PB TEL/Dterm
350 Ω
(Including TEL
resistance)
Max. 200 meters (609 feet) Max. 200 meters (609 feet)
Table 2-2 Specifications of Interface between NEAX2400 IMS and the DRU
ITEM INTERFACE SPECIFICATIONS
DRU-30-A/DRU-30-S3 DRU-23-S3
DRU Installing Con-
dition In-Premises Direct Installation In-Premises Direct Installation/Remote Instal- lation by T1 Interface
Extensible Distance Max. 400 meters (1218 feet)
[In the case of In-Premises Direct Installation] Max. 400 meters (1218 feet) [In the case of In-Premises Direct Installation]
Transmission Speed 2.048 Mbps 1.544 Mbps
Number of voice/
Data Channels 30 CH 23 CH
Number of Common
Channels 1 CH 1 CH
Transmission Code AMI (HDB3) AMI (B8ZS)