ADC Migration Modules DSX-3 User manual

ADCP-80-353
Issue 2
August 2002
1021186 Rev B
DSX-3 (DSX-4U-24)
Rear Cross-Connect System
Installation Guide

ADCP-80-353
Issue 2
August 2002
1021186 Rev B
DSX-3 (DSX-4U-24)
Rear Cross-Connect System
Installation Guide

ADCP-80-353 • Issue 2 • August 2002 • Preface
Page ii
COPYRIGHT
© 2002, ADC Telecommunications, Inc.
All Rights Reserved
Printed in the U.S.A.
REVISION HISTORY
TRADEMARK INFORMATION
ADC is a registered trademark of ADC Telecommunications, Inc.
DISCLAIMER OF LIABILITY
Contents herein are current as of the date of publication. ADC reserves the right to change the contents without prior notice. In no
event shall ADC be liable for any damages resulting from loss of data, loss of use, or loss of profits and ADC further
disclaims any and all liability for indirect, incidental, special, consequential or other similar damages. This disclaimer of
liability applies to all products, publications and services during and after the warranty period.
This publication may be verified at any time by contacting ADC’s Technical Assistance Center at 1-800-366-3891, extension 73475
(in U.S.A. or Canada) or 952-917-3475 (outside U.S.A. and Canada), or by e-mail to [e-mail].
ISSUE DATE REASON FOR CHANGE
1 01/1998 Original
2 08/2002 Non-technical update.
ADC Telecommunications, Inc.
P.O. Box 1101, Minneapolis, Minnesota 55440-1101
In U.S.A. and Canada: 1-800-366-3891
Outside U.S.A. and Canada: [phone]
Fax: [phone]

ADCP-80-353 •Issue 2 •August 2002 •Preface
Page iii
© 2002, ADC Telecommunications, Inc.
TABLE OF CONTENTS
Content Page
ABOUT THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
RELATED PUBLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
ADMONISHMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
SECTION 1:
DESCRIPTION
1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
2 FEATURES AND BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
2.1 Modularity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2.2 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
2.3 Tracer Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
2.4 Cable Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
3 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
4 PHYSICAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
4.1 DSX-4U Circuit Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7
4.2 DSX-4U Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
4.3 Fuse Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
4.4 Cable Rings and Troughs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4.5 Cable Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4.6 Cross-Connect System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5 SYSTEM SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
SECTION 2:
INSTALLATION
1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2 OFFICE REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.1 Space and Floor Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.2 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.3 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.4 Cable Types and Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
3 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
3.1 Bay Installation/Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
3.2 Circuit Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
3.3 Installation of Office/Equipment Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
3.4 Cross-Connect Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
4 POWER APPLICATION AND SYSTEM CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
SECTION 3:
TABLE OF CONTENTS

ADCP-80-353 •Issue 2 •August 2002 •Preface
Page iv
© 2002, ADC Telecommunications, Inc.
TABLE OF CONTENTS
Content Page
GENERAL INFORMATION
1 WARRANTY/SOFTWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
2 SOFTWARE SERVICE AGREEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3 REPAIR/EXCHANGE POLICY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
4 REPAIR CHARGES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
5 REPLACEMENT/SPARE PRODUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
6 RETURNED MATERIAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
7 CUSTOMER INFORMATION AND ASSISTANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
TABLE OF CONTENTS

ADCP-80-353 •Issue 2 •August 2002 •Preface
Page v
© 2002, ADC Telecommunications, Inc.
ABOUT THIS MANUAL
This Installation Guide describes ADC’s DSX-3 (DSX-4U-24) Rear Cross-Connect System and
provides all instructions necessary to install the system.
RELATED PUBLICATIONS
Listed below are related manuals and their publication numbers. Copies of these publications can
be ordered by contacting the Technical Assistance Center at 1-800-366-3891, extension 73475
(in U.S.A. or Canada) or 952-917-3475 (outside U.S.A. and Canada).
DS3 Digital Signal Cross-Connect (DSX-3) System Applications Guide 80-323
Unequal Flange Rack Installation Instructions 80-345
ADMONISHMENTS
Important safety admonishments are used throughout this manual to warn of possible hazards to
persons or equipment. An admonishment identifies a possible hazard and then explains what
may happen if the hazard is not avoided. The admonishments — in the form of Dangers,
Warnings, and Cautions — must be followed at all times. These warnings are flagged by use of
the triangular alert icon (seen below), and are listed in descending order of severity of injury or
damage and likelihood of occurrence.
Title ADCP Number
Danger: Danger is used to indicate the presence of a hazard that will cause severe personal
injury, death, or substantial property damage if the hazard is not avoided.
Warning: Warning is used to indicate the presence of a hazard that can cause severe personal
injury, death, or substantial property damage if the hazard is not avoided.
Caution: Caution is used to indicate the presence of a hazard that will or can cause minor
personal injury or property damage if the hazard is not avoided.

ADCP-80-353 •Issue 2 •August 2002 •Preface
Page vi
© 2002, ADC Telecommunications, Inc.
DSX-3 (DSX-4U-24) REAR CROSS-CONNECT SYSTEM
USE
3 AMP
FUSE
MAXIMUM
50 AMP
MAXIMUM
TOTAL BUSS
AMPERAGE
BLOWN FUSE
INDICATOR
48
12 16
8666-A

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-1
© 2002, ADC Telecommunications, Inc.
SECTION 1: DESCRIPTION
1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
2 FEATURES AND BENEFITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
2.1 Modularity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2.2 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
2.3 Tracer Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
2.4 Cable Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
3 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
4 PHYSICAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
4.1 DSX-4U Circuit Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7
4.2 DSX-4U Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
4.3 Fuse Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9
4.4 Cable Rings and Troughs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4.5 Cable Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4.6 Cross-Connect System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
5 SYSTEM SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
_________________________________________________________________________________________________________
1 GENERAL
This section describes ADC’s DSX-3 (DSX-4U-24) Rear Cross-Connect System and its
applications in large and small offices, digital loop carriers, and customer premises. The system
provides for test access, patch, cross-connect, and monitor functions in 75 ohm digital
transmission systems operating with a common signal format and bit rate. Bit rates of digital
systems in which this cross-connect system may be used are:
• 2.048 megabits per second.
• 8.448 megabits per second.
• 34.368 megabits per second.
• 51.84 megabits per second.
• 139.264 megabits per second.
• 155.52 megabits per second.
The DSX-3 (DSX-4U-24) Rear Cross-Connect System is typically used between multiplexing/
demultiplexing or digital switch equipment and a transmission medium such as digital coaxial
cable, microwave radio, or fiber optics. It is recommended that signals from all digital
equipment are maintained at an equal level at the cross-connect system by means of office-
provided pads and equalizers which compensate for the various cable lengths. This allows for
testing, patching, and rearranging of compatible equipment at the cross-connect system without
having to readjust signal levels.
Content Page

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-2
© 2002, ADC Telecommunications, Inc.
2 FEATURES AND BENEFITS
2.1 Modularity
The DSX-3 (DSX-4U-24) Rear Cross-Connect System is modular for easy expansion at the
user’s site, and may provide any number of bi-directional cross-connects in multiples of 120 (up
to 240 equipment terminations) per 2.13 meter (7 foot) bay. This allows for installation of a
minimal system configuration to meet the immediate needs of a site, and then expanding it as
necessary by adding individual DSX-4U circuit modules. Each cross-connect system consists of
up to 240 DSX-4U circuit modules (two per cross-connect) plugged into a 2.13 m × 48.26 cm ×
30.48 cm (7 foot × 19 inch × 12 inch) equipment bay.
2.2 Connectors
The DSX-3 (DSX-4U-24) Rear Cross-Connect System has BNC connectors for terminating
coaxial cross-connect (XO and XI) and equipment IN/OUT (O and I) cabling, and pin jacks for
interconnecting of tracer lamps. Patching and monitoring is accomplished by means of standard
or midsize coaxial jacks located on the front of the module.
2.3 Tracer Lamps
A red flashing light emitting diode (LED) tracer lamp is located at the top of each DSX-4U
circuit module for quick and easy identification of cross-connected circuits.
2.4 Cable Management
Unequal flange (duct type) racks and spacers provide space for routing office/equipment cables
to and from the various shelves in the cross-connect system bay. Cable brackets are provided on
each side at the rear for fastening of the cables to the bay. Vertical and horizontal rings are
provided at the rear of the bay for orderly routing of cross-connect cables between circuit
modules on the bay, and cable troughs at the top and bottom allow for orderly cross-connect
cabling between bays.
3 FUNCTIONAL DESCRIPTION
The DSX-3 (DSX-4U-24) Rear Cross-Connect System consists of up to 240 individual DSX-
4U circuit modules, two of which are shown schematically in Figure 1-1. Each circuit module
accommodates the input and output of one digital equipment unit, and two circuit modules are
required for each cross-connect.
Note: ADC recommends spacing of 25.4 cm (10.0 inches) between bays to avoid the
possibility of cable congestion.

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-3
© 2002, ADC Telecommunications, Inc.
Figure 1-1. Two DSX-4U Circuits
Each circuit module has connectors and jacks for terminating office/equipment cables and for
cross-connecting and patching the various office/equipment units together. Cabling from office
equipment is connected to DSX-4U equipment IN/OUT connectors, and any equipment input or
output may then be connected to any other equipment input/output by means of jumpers
connected to the cross-connect connectors. Equipment inputs and outputs may also be tested or
temporarily patched to other equipment inputs and outputs by means of patch cords plugged
into the DSX-4U patch jacks.
A typical DSX-4U circuit arrangement is shown in Figure 1-2. Office equipments A, B, and C
are connected to the IN/OUT connectors of three different DSX-4U circuit modules. Office
equipments A and B are then connected together at the DSX-4U circuit modules by temporary
patch cords. The corresponding tracer lamp (TL) terminals are also jumpered together by the
messenger cord in the cross-connect cable. Cross-connected equipments A and B can now be
identified, monitored, and tested as follows:
1. Circuit Identification - Pulling any lamp switch (LS) outward causes the tracer lamp at
each end of the corresponding cross-connect cable to flash for approximately 30 seconds
and then remain lit until the lamp switch (LS) is pushed back in. This gives a visual
indication of the equipment units that are cross-connected together.
2. Bridged Monitoring and Testing - Monitor or test equipment patched into the MON jack
of either circuit module allows testing without interrupting the signals between the A and
B equipment.
3. Split-Circuit Testing - Test equipment patched into an IN or OUT jack splits the A-to-B
equipment circuit for direct access testing of either equipment unit.
1266-D
X-O/
X-I
OUT
MON
IN
X-O/
X-I
GND
–48V
LAMP
SWITCH
LAMP
SWITCH
GND TL TL
–48V
MESSENGER
CORD
EQPT
B
MON
OUT
IN
EQPT
A
X-IN
X-OUT
X-IN
X-OUT
OUT
IN
OUT
IN
=EQUIPMENT IN OUT CONNECTOR
= CROSS-CONNECT CONNECTOR
= PATCH JACK
= PIN JACK

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-4
© 2002, ADC Telecommunications, Inc.
In addition, patch cables can be used to split cross-connected equipment units, and connect
either of the two units to a third unit. In Figure 1-2, equipment B is temporarily patched to
equipment C.
As seen in Figure 1-2, numerous testing and patch-around configurations are possible, all of
which are established permanently or temporarily at the centrally located cross-connect system.
Figure 1-2. Typical DSX-3 (DSX-4U-24) Circuit Arrangement
4 PHYSICAL DESCRIPTION
Front and rear views of a typical fully configured DSX-3 (DSX-4U-24) Rear Cross-Connect
System bay are shown in Figure 1-3 and Figure 1-4. The bay is comprised of up to ten module
chassis, each capable of holding up to 24 DSX-4U circuit modules. A fuse panel located near
the top of the bay supplies power to each chassis. Provision for an AC outlet is located at the
bottom of the bay. Rings and brackets at the back of the bay allow for routing and securing
equipment in/out cables and cross-connect jumpers.
Equipment and cross-connect cabling to the cross-connect system bay is by means of BNC
coaxial connectors located on the back of the circuit module. Each circuit module also has
midsize coaxial jacks on the front for patching and monitoring.
1267-C
X-O/
X-I
OUT
MON
IN
X-O/
X-I
GND
–48V
LAMP
SWITCH
LAMP
SWITCH
GND TL
TL
TL
–48V
LAMP
SWITCH
GND
–48V
MESSENGER
CORD
EQPT
B
MON
OUT
IN
EQPT
A
MON
OUT
IN
EQPT
C
PERMANENT
CROSS-CONNECT
CABLES
X-IN
X-OUT
X-IN
X-OUT
X-IN
X-OUT
OUT
IN
OUT
IN
OUT
IN
=EQUIPMENT IN OUT CONNECTOR
= CROSS-CONNECT CONNECTOR
= PATCH JACK
= PIN JACK

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-5
© 2002, ADC Telecommunications, Inc.
Figure 1-3. DSX-3 (DSX-4U-24) Rear Cross-Connect System Bay (Front View)
USE
3 AMP
FUSE
MAXIMUM
50 AMP
MAXIMUM
TOTAL BUSS
AMPERAGE
BLOWN FUSE
INDICATOR
48
12 16
8666-A

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-6
© 2002, ADC Telecommunications, Inc.
Figure 1-4. DSX-3 (DSX-4U-24) Rear Cross-Connect System Bay (Rear View)
REMOTE ALARMS
NEG (-)
POS (+)
1-10
11-20
1-10
11-20
–48V
ONLY
NEG (–)
BUS
POS (+)
BUS
GND
DANGER
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
CKT
13
14
15
16
17
18
19
20
21
22
23
24
X-OUT X-IN CKT
1
2
3
4
5
6
7
8
9
10
11
12
X-OUT X-IN
8665-A

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-7
© 2002, ADC Telecommunications, Inc.
4.1 DSX-4U Circuit Modules
Each DSX-4U circuit module, shown in Figure 1-5, provides access to the input and output of one
digital office equipment unit. The unit dimensions are approximately 15.02 × 1.78 × 23.04 cm
(6.00 × 0.70 × 9.02 inches).
Figure 1-5. DSX-4U Circuit Module
The DSX-4U module is designed for use with either E1, E3, E4 or STM-1 interfaces; however,
only one type of interface should be terminated at any one cross-connect system bay. The
module has standard or midsize coaxial jacks for testing and patching. BNC coaxial connectors
at the back of the module are used for connecting the equipment in/out cables and cross-connect
jumpers. Specific functions of the circuit module components are defined in Table 1-1.
8637-A
TRACER
LAMP
LAMP
SWITCH
MON
OUT
IN
CROSS
CONNECT
CROSS
CONNECT
–48V/GND
EQUIPMENT
CONNECTION
EQUIPMENT
CONNECTION
TL
XO
XI
O
I
SIDEVIEW REARVIEW

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-8
© 2002, ADC Telecommunications, Inc.
Table 1-1. DSX-3 (DSX-4U-24) Circuit Module Components
NAME TYPE LOCATION FUNCTION
Tracer Lamp (TL) Red LED Indicator Front Used to identify the opposite end of a
cross-connect. The tracer lamp flashes
for approximately 30 seconds whenever
the tracer lamp switch is pulled out, and
remains lit while the tracer lamp switch
is left pulled out. If the module is cross-
connected to another module, the tracer
lamp on that module will also flash
approximately 30 seconds and then
remain lit.
Lamp Switch (LS) Push/Pull Switch Front Provides bridged access to the output
signal of connected office equipment to
allow monitoring without interruption.
MON (Monitor) Midsize Coaxial Jack Front Provides bridged access to the output
signal of connected office equipment to
allow monitoring without interruption.
OUT Midsize Switching
Coaxial Jack Front Provides
test or patch access to digital
equipment output terminations. Any
cross-connect to the X-O jack is disabled
and terminated to 75 ohm ground when-
ever a plug is in the OUT jack.
IN Midsize Switching
Coaxial Jack Front Provides
test or patch access to digital
equipment input terminations. Any cross-
connect to the X-I jack is disabled and
terminated to 75 ohm ground whenever
a plug is in the IN jack.
XO and XI BNC Connector Rear Provides direct access to the digital
equipment output (XO) or input (XI)
termination for cross-connecting to any
digital equipment output or input
termination via the cross-connect system.
O and IBNC Connector Bottom
Rear Provides
for connection from the digital
equipment output (O) or input (I) termi-
nation.
(Not marked) Pin Jacks Top Rear Provides for interconnecting of the tracer
lamps for the corresponding cross-con-
nects to allow tracer lamp operation as
described above. The connections
between the circuit modules should cor-
respond exactly to the XO or XI cross
connect jumpers. Cross-connect jumpers
are available with messenger cords which
accommodate both the cross-connect and
the corresponding lamp connection.

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-9
© 2002, ADC Telecommunications, Inc.
4.2 DSX-4U Chassis
The DSX-4U chassis, as shown in Figure 1-6, provides the mounting for up to 24 circuit
modules. It is 15.2 cm (6 inches) high, 48.26 cm (19 inches) wide and is designed for
installation in bays with mounting holes spaced at 2.54 cm (1.0 inch).
Figure 1-6. DSX-4U Chassis
White adhesive-backed designation labels are shipped with the chassis for application at the
user’s site. These labels may be pre-printed to customer request or they may be blank to allow
designations to be added during installation.
4.3 Fuse Panel
The fuse panel, as shown in Figure 1-7, provides –48 Vdc power protection for all cross-connect
system tracer lamp LED circuitry in the bay. Power for each DSX-4U chassis is supplied
through a separate 0.5 Amp fuse. (Each LED draws 0.01 Amp, 24 LEDs in a chassis, equates to
a 0.24 Amp load.) The GMT fuse has a colored tab which is displayed when the fuse is blown.
The fuse panel also has a LED indicator which lights whenever any fuse on the panel is blown.
The fuse panel may also be connected to an external alarm system.
Figure 1-7. Fuse Panel
8639-A
FRONT VIEW
USE
3 AMP
FUSE
MAXIMUM
50 AMP
MAXIMUM
TOTAL BUSS
AMPERAGE
BLOWN FUSE
INDICATOR
48
12 16
2389-B
REAR VIEW
REMOTE ALARMS
NEG (-)
POS (+)
1-10
11-20
1-10
11-20
– 48V
ONLY
NEG (–)
BUS
POS (+)
BUS
GND
A
B
C
D
E
F1 2 3 4 5 6 7 8 9 10

ADCP-80-353 •Issue 2 •August 2002 •Section 1: Description
Page 1-10
© 2002, ADC Telecommunications, Inc.
4.4 Cable Rings and Troughs
Vertical cable rings at the rear of the bay allow for routing of cross-connect jumpers up and
down each side of the bay. Cable troughs at the top and bottom of the bay provide for the
routing of cross-connect jumpers between bays.
4.5 Cable Brackets
The cables are brought in at the sides of the bay and tied to the cable brackets.
4.6 Cross-Connect System
The cross-connect system bay is an unequal flange type, 213 × 65.88 × 30.48 cm (84 × 25.94 × 12
inches). Shelf mounting holes are spaced at 2.54 cm (1 inch). An AC outlet may be provided at
the bottom front of the bay as an auxiliary source of 110 Vac primary power.
5 SYSTEM SPECIFICATIONS
Specifications for the DSX-3 (DSX-4U-24) Rear Cross-Connect System are shown in Table 1-2.
Table 1-2. System Specifications
PARAMETER SPECIFICATION
Physical
Height: 2.13 m (7.0 feet)
Width: 55.72 cm (21.94 inches)
Depth: 30.48 cm (12 inches)
Weight: 163 kg (360 pounds) (fully equipped)
Power
Voltage: –48 Vdc
Current: 10 mA for each lit LED tracer lamp
Environmental
Operating Temperature: –40° to 65° C (–40° to +149° F)
Storage Temperature: –55° to +85° C (–67° to +185° F)
Operating and Storage Humidity: 0% to 95% without condensation
Functional
Characteristic Impedance: 75 ohms unbalanced.
Insertion Loss: Less than 0.8 dB at 22.368 mHz and less than 1.9 dB at
137.088 mHz with up to 27 feet (8.23 m) of cross-connect cable.
Crosstalk: Better than 60 dB.
Return Loss: Greater than 20 dB (DC to 300 mHz).
Monitor Level: 21.5 dB ±1.5 dB below signal level (DC to 300 mHz).

ADCP-80-353 •Issue 2 •August 2002 •Section 2: Installation
Page 2-1
© 2002, ADC Telecommunications, Inc.
SECTION 2: INSTALLATION
1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2 OFFICE REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.1 Space and Floor Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.2 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1
2.3 Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
2.4 Cable Types and Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
3 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
3.1 Bay Installation/Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3
3.2 Circuit Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
3.3 Installation of Office/Equipment Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
3.4 Cross-Connect Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
4 POWER APPLICATION AND SYSTEM CHECKOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
_________________________________________________________________________________________________________
1 GENERAL
This section provides complete instructions for installing the DSX-3 (DSX-4U-24) Rear Cross-
Connect System. It is recommended that the entire section be read and understood before
beginning installation.
2 OFFICE REQUIREMENTS
2.1 Space and Floor Loading
The cross-connect system consists of up to 240 circuit modules mounted in a standard 2.13 m ×
48.26 cm (7-foot × 19-inch) unequal flange equipment bay. Maximum width of the bay is 55.72 cm
(21.94 inches), and maximum depth is 30.47 cm (12 inches). A fully configured unwired/uncabled
cross-connect system bay weighs approximately 163 kg (360 pounds).
2.2 Environment
2.2.1 Shipping and Storage
The cross-connect system must be shipped and stored in ambient temperatures and humidities
which do not exceed the following:
• Temperature: –55° to +85° C (–67° to +185° F).
• Relative Humidity: 0% to 95% without condensation.
Content Page

ADCP-80-353 •Issue 2 •August 2002 •Section 2: Installation
Page 2-2
© 2002, ADC Telecommunications, Inc.
2.2.2 Operational
The DSX-3 (DSX-4U-24) Rear Cross-Connect System must be operated in ambient
temperatures and humidities which do not exceed the following:
• Temperature: –40° to +65° C (–40° to +149° F).
• Relative Humidity: 0% to 95% without condensation.
2.3 Power
The cross-connect system operates on –48 Vdc filtered office battery, fused or breakered at the
office distribution panel. Approximate current requirements can be calculated based on 10
milliamps for each lit LED tracer lamp. The number of tracer lamps lit at any one time will
depend on local patching and testing procedures. The fuse panel, just below the upper wire
trough, at the top of the bay provides a 0.5 Amp. fuse for each DSX-4U chassis in the bay.
2.4 Cable Types and Lengths
All coaxial cables should be 75 ohm coaxial with tinned copper shield (735A/734A or
equivalent).
The digital equipment terminated at the cross-connect system bay must have equalizers and/or
pads which are adjusted for the particular cable lengths to maintain the proper transmission
levels. The maximum length between digital equipment and the bay is governed by the specific
item of equipment and cable type. See Figure 2-1 and Table 2-1 for detailed cable length
information.
Figure 2-1. Coaxial Cable Lengths and Losses
NETWORK
ELEMENT
(NE)
NETWORK
ELEMENT
(NE)
DSX DSX
0.50 dB
0.50 dB
0.50 dB
0.50 dB
0.50 dB
6.0 dB TOTAL
12.0 dB TOTAL
CROSS-CONNECT JUMPERS
EQUIPMENT CABLES
9213-B
34.368, 51.84, 139.264 Mbps
155.52 Mbps
2.048, 8.448 Mbps
12.7 dB TOTAL
2.048, 8.448 Mbps
34.368, 51.84, 139.264 Mbps
155.52 Mbps
0.75 dB
0.75 dB
0.75 dB
0.75 dB
2.25 dB 2.25 dB
5.0 dB
5.35 dB
5.0 dB
5.35 dB

ADCP-80-353 •Issue 2 •August 2002 •Section 2: Installation
Page 2-3
© 2002, ADC Telecommunications, Inc.
3 INSTALLATION
3.1 Bay Installation/Expansion
Installation of cross-connect system hardware may consist of installation of an entire new cross-
connect system bay or expansion of an existing bay. Location of a new bay must take into
consideration its distance to other equipment, other system bays, and cable type.
3.1.1 Positioning and Mounting of New Bay
Set the bay in its assigned position, and secure it to the floor and to adjacent bays using
appropriate hardware. Also secure it to overhead support if required. Refer to the Unequal
Flange Rack Installation Instructions (ADCP-80-345).
Table 2-1. IN/OUT Equipment Cable and Cross-Connect Jumper Lengths by Cable Type
EQUIPMENT CABLES
TRANSMISSION RATE 734A TYPE 735A TYPE
2.048 252.2 m (827.2 feet) 118.2 m (387.9 feet)
8.448 135.6 m (444.7 feet) 58.1 m (190.7 feet)
34.368 158.2 m (518.8 feet) 77.3 m (253.6 feet)
139.264 73.6m (241.5 feet) 36.2 m (118.8 feet)
51.84 128 m (420 feet) 64 m (210 feet)
155.52 74.5 m (244.3 feet) 36.6 m (119.9 feet)
CROSS-CONNECT JUMPERS
TRANSMISSION RATE 735A TYPE RG59 TYPE
2.048 26.3 m (86.2 feet) 38.6 m (126.7 feet)
8.448 12.9 m (42.4 feet) 19 m (62.4 feet)
34.368 7.4 m (24.2 feet) 9.4 m (30.9 feet)
139.264 3.6 m (11.9 feet) 4.7 m (15.4 feet)
51.84 6.1 m (20.0 feet) 7.7 m (25.2 feet)
155.52 3.4 m (11.2 feet) 4.4 m (14.5 feet)
Note: The recommended spacing between bays is 25.4 cm (10.0 inches) when using 734A
or equivalent and 12.7 cm (5.0 inches) when using 735A or equivalent cables for cross-
connect and equipment IN/OUT cabling.
Caution: A crated DSX-3 (DSX-4U-24) Rear Cross-Connect System bay weighs approximately
265 kg (585 pounds). An adequately rated and secured block and tackle or overhead hoist must
be used while uncrating, positioning, and securing the bay.