ADC Migration Modules DSX-3 User manual

DSX-3 (DSX-4H-24)
Rear Cross-Connect System
User Manual
ADCP-80-314
Issue 6
January 2001
4-40001-2937 Rev B

ADCP-80-314 •Issue 6 •January 2001 •Preface
Page ii
COPYRIGHT
2001, ADC Telecommunications, Inc.
All Rights Reserved
Printed in the U.S.A.
REVISION HISTORY
ISSUE DATE REASON FOR CHANGE
1st Edition, Issue 1 05/1991 Original
2nd Edition, Issue 1 08/1992 Provide additional operation procedures and clarification terminology.
2nd Edition, Issue 2 10/1992 Change equipment and cross-connect cabling limitations.
3rd Edition, Issue 1 09/1996 Reformatted to current standards and incorporated editorial and technical changes.
3rd Edition, Issue 2 03/1998 Updated to show new ADC corporate address.
Issue 6 01/2001 Non-technical update.
TRADEMARK INFORMATION
ADC and ADC Telecommunications are registered trademarks 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 63475
(in U.S.A. or Canada) or 952-946-3475 (outside U.S.A. and Canada), or by e-mail to [email protected].
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-80-314 •Issue 6 •January 2001 •Preface
Page iii
2001, ADC Telecommunications, Inc.
TABLE OF CONTENTS
Content Page
PREFACE
COPYRIGHT ............................................................................. ii
REVISION HISTORY ........................................................................ ii
TRADEMARK INFORMATION .................................................................. ii
DISCLAIMER OF LIABILITY ................................................................... ii
ABOUT THIS MANUAL ...................................................................... vii
RELATED PUBLICATIONS .................................................................... vii
ADMONISHMENTS......................................................................... vii
SECTION 1
DESCRIPTION AND APPLICATION
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 ............................................................ 1-3
4 APPLICATIONS ..................................................................... 1-5
4.1 Testing and Fault Isolation ....................................................... 1-5
4.2 Interoffice Service Restoration..................................................... 1-5
4.3 Traffic Pattern Changes ......................................................... 1-5
4.4 System Expansion ............................................................. 1-5
4.5 Office Layout ................................................................ 1-5
4.6 Cutover To New Digital Switch ..................................................... 1-5
4.7 Office Record Keeping .......................................................... 1-6
5 PHYSICAL DESCRIPTION .............................................................. 1-6
5.1 DSX-4H Circuit Modules ......................................................... 1-9
5.2 DSX-4H Chassis.............................................................. 1-10
5.3 Fuse Panel ................................................................. 1-11
5.4 Cable Rings and Troughs ....................................................... 1-11
5.5 Cable Brackets .............................................................. 1-11
5.6 Cross-Connect System ......................................................... 1-11
6 SYSTEM SPECIFICATIONS ............................................................ 1-11

ADCP-80-314 •Issue 6 •January 2001 •Preface
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2001, ADC Telecommunications, Inc.
TABLE OF CONTENTS
Content Page
SECTION 2
INSTALLATION
1 GENERAL ......................................................................... 2-1
2 OFFICE REQUIREMENTS ............................................................... 2-1
2.1 Space and Floor Loading .........................................................2-1
2.2 Environment .................................................................2-2
2.3 Power ...................................................................... 2-2
2.4 Signal Levels................................................................. 2-2
2.5 Cable Types..................................................................2-2
2.6 Cable 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 Office Power to Bay Wiring........................................................ 2-8
4 POWER APPLICATION AND SYSTEM CHECKOUT .............................................. 2-11
SECTION 3
OPERATION
1 GENERAL ......................................................................... 3-1
PROCEDURE 1: CROSS-CONNECT CIRCUIT IDENTIFICATION ............................................ 3-2
PROCEDURE 2: DIGITAL OFFICE EQUIPMENT TEST .................................................. 3-3
PROCEDURE 3: IN-SERVICE PATCHING TO BYPASS A FAILED FACILITY.....................................3-4
PROCEDURE 4: IN-SERVICE ROLL OVER TO NEW FACILITY............................................. 3-6
PROCEDURE 5: OUT-OF-SERVICE PATCH ......................................................... 3-8
PROCEDURE 6: OUT-OF-SERVICE TRAFFIC PATTERN CHANGES.......................................... 3-9
SECTION 4
MAINTENANCE
1 GENERAL ......................................................................... 4-1
2 PREVENTIVE MAINTENANCE ............................................................4-1
3 CORRECTIVE MAINTENANCE ............................................................4-1
3.1 Troubleshooting ...............................................................4-1
3.2 Tracer Lamp Replacement ........................................................4-2
3.3 Fuse Replacement ............................................................. 4-2
3.4 Circuit Module Replacement ...................................................... 4-2

ADCP-80-314 •Issue 6 •January 2001 •Preface
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2001, ADC Telecommunications, Inc.
TABLE OF CONTENTS
Content Page
SECTION 5
GENERAL INFORMATION
1 WARRANTY/SOFTWARE ............................................................... 5-1
2 SOFTWARE SERVICE AGREEMENT ........................................................ 5-1
3 REPAIR/EXCHANGE POLICY ............................................................ 5-1
4 REPAIR CHARGES ................................................................... 5-2
5 REPLACEMENT/SPARE PRODUCTS........................................................ 5-2
6 RETURNED MATERIAL ................................................................ 5-2
7 CUSTOMER INFORMATION AND ASSISTANCE ................................................ 5-3

ADCP-80-314 •Issue 6 •January 2001 •Preface
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2001, ADC Telecommunications, Inc.

ADCP-80-314 •Issue 6 •January 2001 •Preface
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2001, ADC Telecommunications, Inc.
ABOUT THIS MANUAL
This user manual describes ADC’s DSX-3 (DSX-4H-24) Rear Cross-Connect System and its
applications in large and small offices, digital loop carriers, and customer premises. The
manual also provides all instructions necessary to install, operate, and maintain the system.
RELATED PUBLICATIONS
Listed below are related manuals and their publication numbers. Copies of these publications
can be ordered by contacting the ADC Technical Assistance Center at 1-800-366-3891
(in U.S.A. or Canada) or 952-946-3000, extension 63475 (outside U.S.A. and Canada).
Title ADCP Number
DSX-3 (DSX-4H-24) Rear Cross-Connect Installation Guide 80-321
DS3 Digital Signal Cross-Connect (DSX-3) System Applications Guide 80-323
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.
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-80-314 •Issue 6 •January 2001 •Preface
Page viii
2001, ADC Telecommunications, Inc.
USE
3 AMP
FUSE
MAXIMUM
50 AMP
MAXIMUM
TOTAL BUSS
AMPERAGE
BLOWN FUSE
INDICATOR
48
12 16
8666-A
DSX-3 (DSX-4H-24) REAR CROSS-CONNECT SYSTEM

DESCRIPTION AND
APPLICATION

ADCP-80-314 •Issue 6 • January 2001 • Section 1: Description and Application
Page 1-1
2001, ADC Telecommunications, Inc.
SECTION 1: DESCRIPTION AND APPLICATION
Content Page
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 ............................................................ 1-3
4 APPLICATIONS ..................................................................... 1-5
4.1 Testing and Fault Isolation ....................................................... 1-5
4.2 Interoffice Service Restoration..................................................... 1-5
4.3 Traffic Pattern Changes ......................................................... 1-5
4.4 System Expansion ............................................................. 1-5
4.5 Office Layout ................................................................ 1-5
4.6 Cutover To New Digital Switch ..................................................... 1-5
4.7 Office Record Keeping .......................................................... 1-6
5 PHYSICAL DESCRIPTION .............................................................. 1-6
5.1 DSX-4H Circuit Modules ......................................................... 1-9
5.2 DSX-4H Chassis.............................................................. 1-10
5.3 Fuse Panel ................................................................. 1-11
5.4 Cable Rings and Troughs ....................................................... 1-11
5.5 Cable Brackets .............................................................. 1-11
5.6 Cross-Connect System ......................................................... 1-11
6 SYSTEM SPECIFICATIONS ............................................................ 1-11
1 GENERAL
This section describes ADC’s DSX-3 (DSX-4H-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:
•DS3 44.736 megabits per second.
•DS4NA 139.264 megabits per second.
•STS-1 51.84 megabits per second.
•STS-3 155.52 megabits per second.

ADCP-80-314 • Issue 6 • January 2001 • Section 1: Description and Application
Page 1-2
2001, ADC Telecommunications, Inc.
The DSX-3 (DSX-4H-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. 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.
2 FEATURES AND BENEFITS
2.1 Modularity
The DSX-3 (DSX-4H-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 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-4H circuit modules. Each cross-connect system consists of up to
240 DSX-4H circuit modules (two per cross-connect) plugged into a 7 foot ×23 inch ×12
inch (2.13 m ×58.42 cm ×30.48 cm) equipment bay.
2.2 Connectors
The DSX-3 (DSX-4H-24) Rear Cross-Connect System has BNC or TNC 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-4H
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.
Note: ADC recommends spacing of 10.0 inches (25.4 cm) between bays to avoid the
possibility of cable congestion.

ADCP-80-314 • Issue 6 • January 2001 • Section 1: Description and Application
Page 1-3
2001, ADC Telecommunications, Inc.
3 FUNCTIONAL DESCRIPTION
The DSX-3 (DSX-4H-24) Rear Cross-Connect System consists of up to 240 individual DSX-4H
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.
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
Figure 1-1. Two DSX-4H 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-4H 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-4H patch jacks.
Atypical DSX-4H circuit arrangement is shown inFigure 1-2.Office equipments A,B,and C
are connected to the IN/OUT connectors of three different DSX-4H circuit modules. Office
equipments A and B are then connected together at the DSX-4H 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:
•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.
•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.

ADCP-80-314 • Issue 6 • January 2001 • Section 1: Description and Application
Page 1-4
2001, ADC Telecommunications, Inc.
•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.
In addition, patch cables can be used to split cross-connected equipment units, and connect
either of the two units to athird unit. In Figure 1-2,equipment Bis 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. As a result, many benefits can be immediately realized as described in the following
applications.
Note: The Operation Section of this manual provides schematic diagrams and step-by-
step procedures for most of the functions performed at the cross-connect system.
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
Figure 1-2. Typical DSX-3 (DSX-4H-24) Circuit Arrangement

ADCP-80-314 • Issue 6 • January 2001 • Section 1: Description and Application
Page 1-5
2001, ADC Telecommunications, Inc.
4 APPLICATIONS
4.1 Testing and Fault Isolation
Terminating all digital operational and test equipment at the DSX-3 (DSX-4H-24) Rear Cross-
Connect greatly reduces the amount of time and skilled personnel required for testing and isolation
of troubles. Identification of existing or developing problems is readily accomplished by:
•Testing at circuit module jacks connected directly to digital equipment inputs and outputs.
•Patching in spare equipment for suspected faulty units.
4.2 Interoffice Service Restoration
The loss of a major facility may isolate or greatly reduce communication capability between
the two locations. To temporarily restore partial communications, circuits can be rerouted
through a third location. The reroute is established with simple patch arrangements at the
cross-connect systems at three sites. After the facility is repaired, the reroute patches are
easily removed and normal service is restored.
4.3 Traffic Pattern Changes
Major changes in traffic patterns may be required on a regular basis (daily, weekly, etc.), or on
a long term basis because of a large corporation relocating within the boundary of the serving
office. Any of these requirements can be met by patching or reconfiguring cross-connect
cables at the cross-connect system.
4.4 System Expansion
The DSX-4H-24 facilitates planning for future growth. The system can be grown from, a
minimal installation of one chassis with up to 24 circuit modules, to any number of full bays.
4.5 Office Layout
The DSX-4H-24 makes it possible to add equipment to an office without major changes in the
office layout. Equipment is simply installed where space is available and then cabled to the
centralized cross-connect system. Cross-connect cables on the cross-connect system connect
the equipment into the desired office electrical configuration.
4.6 Cutover To New Digital Switch
The DSX-4H-24 simplifies the cutover to a new digital switch. When a digital switch is
installed, it is terminated on the cross-connect system. The cross-connections serving the
existing switch are then replaced by temporary patch cords, and new cross-connect jumpers
are installed for the new digital switch. Cutover to the new switch is then completed by
removing the temporary patch cords.

ADCP-80-314 • Issue 6 • January 2001 • Section 1: Description and Application
Page 1-6
2001, ADC Telecommunications, Inc.
4.7 Office Record Keeping
The DSX-4H-24 minimizes office record keeping by providing vertical and horizontal
marking for identifying equipment locations and city terminations. In addition, red LED tracer
lamps allow for easy identification of equipment cross-connected at the cross-connect system.
5 PHYSICAL DESCRIPTION
Front and rear views of a typical fully configured DSX-3 (DSX-4H-24) Rear Cross-Connect
System bay are shown inFigures 1-3 and 1-4.The bay is comprised ofuptoten module
chassis, each capable of holding up to 24 DSX-4H 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 or
TNC coaxial connectors located on the back of the circuit module. Each circuit module also
has standard or midsize coaxial jacks on the front for patching and monitoring.

ADCP-80-314 • Issue 6 • January 2001 • Section 1: Description and Application
Page 1-7
2001, ADC Telecommunications, Inc.
USE
3 AMP
FUSE
MAXIMUM
50 AMP
MAXIMUM
TOTAL BUSS
AMPERAGE
BLOWN FUSE
INDICATOR
48
12 16
8666-A
Figure 1-3. DSX-3 (DSX-4H-24) Rear Cross-Connect System Bay (Front View)

ADCP-80-314 • Issue 6 • January 2001 • Section 1: Description and Application
Page 1-8
2001, ADC Telecommunications, Inc.
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
Figure 1-4. DSX-3 (DSX-4H-24) Rear Cross-Connect System Bay (Rear View)

ADCP-80-314 •Issue 6 •January 2001 •Section 1: Description and Application
Page 1-9
2001, ADC Telecommunications, Inc.
5.1 DSX-4H Circuit Modules
Each DSX-4H circuit module, showninFigure 1-5,provides access tothe input and output of
one digital office equipment unit. The unit dimensions are approximately 6.00 ×0.88 ×9.02
inches (15.02 ×2.02 ×23.04 cm).
8637-A
TRACER
LAMP
LAMP
SWITCH
MON
OUT
IN
CROSS
CONNECT
CROSS
CONNECT
–48V/GND
EQUIPMENT
CONNECTION
EQUIPMENT
CONNECTION
TL
XO
XI
O
I
SIDE VIEW REAR VIEW
Figure 1-5. DSX-4H Circuit Module
The DSX-4H module is designed for use with either DS3, STS-1, STS-3, or DS4NA
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
or TNC 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.
Table 1-1. DSX-3 (DSX-4H-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) Standard or Midsize
Coaxial Jack
Front Provides bridged access to the output
signal of connected office equipment to
allow monitoring without interruption.
(continued)

ADCP-80-314 •Issue 6 •January 2001 •Section 1: Description and Application
Page 1-10
2001, ADC Telecommunications, Inc.
Table 1-1. DSX-3 (DSX-4H-24) Circuit Module Components, continued
NAME TYPE LOCATION FUNCTION
OUT Standard or
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
whenever a plug is in the OUT jack.
IN Standard or
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 or TNC
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 I BNC or TNC
Connector
Bottom
Rear
Provides for connection from the digital
equipment output (O) or input (I)
termination.
(Not marked) Pin Jacks Top
Rear
Provides for interconnecting of the tracer
lamps for the corresponding cross-
connects to allow tracer lamp operation as
described above. The connections
between the circuit modules should
correspond 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.
5.2 DSX-4H Chassis
The DSX-4H chassis, as shown inFigure 1-6,provides the mounting for up to 24 circuit
modules. It is 6 inches (15.2 cm) high, 23 inches (58.4 cm) wide and is designed for
installation in bays with mounting holes spaced at 1.0 inch (2.54 cm).
8639-A
Figure 1-6. DSX-4H Chassis

ADCP-80-314 •Issue 6 •January 2001 •Section 1: Description and Application
Page 1-11
2001, ADC Telecommunications, Inc.
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.
5.3 Fuse Panel
The fuse panel, as shown inFigure 1-7,provides –48 Vdc power protection for all cross-
connect system tracer lamp LED circuitry in the bay. Power for each DSX-4H 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.
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
Figure 1-7. Fuse Panel
5.4 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.
5.5 Cable Brackets
The cables are brought in at the sides of the bay and tied to the cable brackets.
5.6 Cross-Connect System
The cross-connect system bay is an unequal flange type, 84 ×25.94 ×12 inches (213 ×65.88
×30.48 cm). Shelf mounting holes are spaced at one inch (2.54 cm). An AC outlet may be
provided at the bottom front of the bay as an auxiliary source of 110 Vac primary power.
6 SYSTEM SPECIFICATIONS
Specifications for the DSX-3 (DSX-4H-24) Front Cross-Connect System are shown inTable 1-2.