ADTRAN DSU III AR User manual

DSU III AR
Data Service Unit
User Manual
Part Number
1202011L1
61202011L1-1C
May 2001

Trademark Information
Open View is a registered trademark of Hewlett-Packard Company.
SunNet Manager is a registered trademark of Sun Microsystems, Inc.
Netview is a registered trademark of IBM.
IQ View is a trademark of ADTRAN, Inc.
Hayes is a trademark of Hayes Microcomputer Products, Inc.
This product includes software developed by the University of California, Berkeley,
and its contributors.
901 Explorer Boulevard
P.O. Box 140000
Huntsville, AL 35814-4000
[phone]
© 2001 ADTRAN, Inc.
All Rights Reserved.
Printed in U.S.A.

iii
The following conventions are used in this manual.
m
Notes provide additional useful information.
Cautions signify information that could prevent service interruption.
Warnings provide information that could prevent damage to the equip-
ment or endangerment to human life.

iv
FCC regulations require that the following information be provided in this man-
ual:
1. This equipment complies with Part 68 of the FCC rules. On the bottom of the
equipment housing is a label that shows the FCC registration number and Ringer
Equivalence Number (REN) for this equipment, if applicable. If required, this
information must be given to the telephone company.
2. The following information may be required when applying to the local telephone
company for leased line facilities.
3. An FCC compliant telephone cord with a modular plug may be provided with
this equipment. This equipment is designed to be connected to the telephone net-
work or premises wiring using a compatible modular jack, which is FCC Part 68
compliant. See installation instructions for details.
4. If this equipment causes harm to the telephone network, the telephone company
may temporarily discontinue service. If possible, advance notification is given;
otherwise, notification is given as soon as possible. The telephone company will
advise the customer of the right to file a complaint with the FCC.
5. The telephone company may make changes in its facilities, equipment, operations,
or procedures that could affect the proper operation of this equipment. If this hap-
pens, the telephone company will provide advance notification and the opportunity
to make the necessary modifications to maintain uninterrupted service.
6. If experiencing difficulty with this equipment, please contact ADTRAN for repair and
warranty information. If the equipment is causing harm to the network, the telephone
company may request this equipment to be disconnected from the network until the
problem is resolved or it is certain that the equipment is not malfunctioning.
7. This unit contains no user serviceable parts.
8. The FCC recommends that the AC outlet to which equipment requiring AC
power is to be installed is provided with an AC surge arrester.
Service
Type Digital Facility Interface Code Service Order Code Network Jacks
2.4 kbps Digital Interface
4.8 kbps Digital Interface
9.6 kbps Digital Interface
19.2 kbps Digital Interface
38.4 kbps Digital Interface
56 kbps Digital Interface
64 kbps Digital Interface
04DU5-24
04DU5-48
04DU5-96
04DU5-19
04DU5-38
04DU5-56
04DU5-64
6.0F
6.0F
6.0F
6.0F
6.0F
6.0F
6.0F
RJ-48S
RJ-48S
RJ-48S
RJ-48S
RJ-48S
RJ-48S
RJ-48S

v
Federal Communications Commission Radio Frequency Interference Statement
This equipment has been tested and found to comply with the limits for a Class A dig-
ital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in
a commercial environment. This equipment generates, uses, and can radiate radio fre-
quency energy and, if not installed and used in accordance with the instruction man-
ual, may cause harmful interference to radio frequencies. Operation of this equipment
in a residential area is likely to cause harmful interference in which case the user will
be required to correct the interference at his own expense.
Shielded cables must be used with this unit to ensure compliance with Class A FCC
limits.
Affidavit Requirements for Connection to Digital Services
• An affidavit is required to be given to the telephone company whenever digital
terminal equipment without encoded analog content and billing protection is
used to transmit digital signals containing encoded analog content which are
intended for eventual conversion into voice band analog signal and transmitted
on the network.
• The affidavit shall affirm that either no encoded analog content or billing informa-
tion is being transmitted or that the output of the device meets Part 68 encoded
analog content or billing protection specification.
• End use/customer will be responsible to file an affidavit with the local exchange
carrier when connecting unprotected CPE to a 1.544 Mbps or subrate digital ser-
vice.
• Until such time as subrate digital terminal equipment is registered for voice appli-
cations, the affidavit requirements for subrate services are waived.
Change or modifications to this unit not expressly approved by the party re-
sponsible for compliance could void the user’s authority to operate the equip-
ment.

vi
CANADIAN EQUIPMENT LIMITATIONS
Notice: The Canadian Industry and Science Canada label identifies certified equip-
ment. This certification means that the equipment meets certain telecommunications
network protective, operational, and safety requirements. The Department does not
guarantee the equipment will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to be con-
nected to the facilities of the local telecommunications company. The equipment must
also be installed using an acceptable methods of connection. In some cases, the com-
pany’s inside wiring associated with a single line individual service may be extended
by means of a certified connector assembly (telephone extension cord). The customer
should be aware that compliance with the above limitations may not prevent degra-
dation of service in some situations.
Repairs to certified equipment should be made by an authorized Canadian mainte-
nance facility designated by the supplier. Any repairs or alterations made by the user
to this equipment, or equipment malfunctions, may give the telecommunications
company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of
the power utility, telephone lines and internal metallic water pipe system, if present,
are connected together. This precaution may be particularly important in rural areas.
The Load Number (LN) assigned to each terminal device denotes the percentage of
the total load to be connected to a telephone loop which is used by the device, to pre-
vent overloading. The termination on a loop may consist of any combination of
devices subject only to the requirement that the total of the Load Numbers of all
devices does not exceed 100.
Users should not attempt to make such connections themselves, but
should contract the appropriate electric inspection authority, or an
electrician, as appropriate.

vii
CANADIAN EMISSIONS REQUIREMENTS
This digital apparatus does not exceed the Class A limits for radio noise emissions
from digital apparatus as set out in the interference-causing equipment standard enti-
tled “Digital Apparatus," ICES-003 of the Department of Communications.
Cet appareil nuerique respecte les limites de bruits radioelectriques applicables aux
appareils numeriques de Class A prescrites dans la norme sur le materiel brouilleur:
"Appareils Numeriques," NMB-003 edictee par le ministre des Communications.
IMPORTANT SAFETY INFORMATION
When using your telephone equipment, please follow these basic safety precautions
to reduce the risk of fire, electrical shock, or personal injury:
1. Do not use this product near water, such as near a bath tub, wash bowl, kitchen
sink, laundry tub, in a wet basement, or near a swimming pool.
2. Avoid using a telephone (other than a cordless-type) during an electrical storm.
There is a remote risk of shock from lightning.
3. Do not use the telephone to report a gas leak in the vicinity of the leak.
4. Use only the power cord, power supply, and/or batteries indicated in the manual.
Do not dispose of batteries in a fire. They may explode. Check with local codes
for special disposal instructions.
SAVE THESE INSTRUCTIONS

viii
Affidavit for Connection of Customer Premises Equipment to 1.544 MBPS and/
or Subrate Digital Services
For the work to be performed in the certified territory of ______________ (telco name)
State of ________________________________
County of ______________________________
I, _______________________ (name), ____________________ (business address),
_____________________ (telephone number) being duly sworn, state:
I have the responsibility for the operation and maintenance of the terminal equipment
to be connected to 1.544 Mbps and/or __________________ subrate digital services.
The terminal equipment to be connected complies with Part 68 of the FCC rules
except for the encoded analog content and billing protection specification.With
respect to encoded analog content and billing protection:
( ) I attest that all operations associated with the establishment, maintenance and adjust-
ment of the digital CPE with respect to encoded analog content and billing protection
information continuously complies with Part 68 of the FCC rules and Regulations.
( ) The digital CPE does not transmit digital signals containing encoded analog con-
tent or billing information which is intended to be decoded within the telecommuni-
cations network.
( ) The encoded analog content and billing protection is factory set and is not under
the control of the customer.
I attest that the operator(s) maintainer(s) of the digital CPE responsible for the estab-
lishment, maintenance and adjustment of the encoded analog content and billing
information has (have) been trained to perform these functions by successfully having
completed one of the following (check appropriate blocks):
( ) A. A training course provided by the manufacturer/grantee of the equipment used
to encode analog signals; or
( ) B. A training course provided by the customer or authorized representative, using
training materials and instructions provided by the manufacturer/grantee of the
equipment used to encode analog signals; or

ix
( ) C. An independent training course (e.g., trade school or technical institution) rec-
ognized by the manufacturer/grantee of the equipment used to encode analog sig-
nals; or
( ) D. In lieu of the proceeding training requirements, the operator(s)/maintainer(S) is
(are) under the control of a supervisor trained in accordance with _______________
(circle one) above.
I agree to provide ____________________ (telco’s name) with proper documentation
to demonstrate compliance with the information in the preceding paragraph, if so
requested.
_____________________ Signature
_____________________ Title
_____________________ Date
Subscribed and sworn to before me
This _________ day of ___________________, 20__
_______________________________________
Notary Public
My commission expires: _________________________

x
LIMITED PRODUCT WARRANTY
ADTRAN warrants that for five (5) years from the date of shipment to Customer, all
products manufactured by ADTRAN will be free from defects in materials and
workmanship. ADTRAN also warrants that products will conform to the applicable
specifications and drawings for such products, as contained in the Product Manual or
in ADTRAN's internal specifications and drawings for such products (which may or
may not be reflected in the Product Manual). This warranty only applies if Customer
gives ADTRAN written notice of defects during the warranty period. Upon such
notice, ADTRAN will, at its option, either repair or replace the defective item. If
ADTRAN is unable, in a reasonable time, to repair or replace any equipment to a
condition as warranted, Customer is entitled to a full refund of the purchase price
upon return of the equipment to ADTRAN. This warranty applies only to the original
purchaser and is not transferable without ADTRAN's express written permission.
This warranty becomes null and void if Customer modifies or alters the equipment in
any way, other than as specifically authorized by ADTRAN.
EXCEPT FOR THE LIMITED WARRANTY DESCRIBED ABOVE, THE FOREGOING
CONSTITUTES THE SOLE AND EXCLUSIVE REMEDY OF THE CUSTOMER AND
THE EXCLUSIVE LIABILITY OF ADTRAN AND IS IN LIEU OF ANY AND ALL
OTHER WARRANTIES (EXPRESSED OR IMPLIED). ADTRAN SPECIFICALLY DIS-
CLAIMS ALL OTHER WARRANTIES, INCLUDING (WITHOUT LIMITATION),
ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. SOMESTATES DO NOT ALLOW THE EXCLUSION OF IMPLIED WAR-
RANTIES, SO THIS EXCLUSION MAY NOT APPLY TO CUSTOMER.
In no event will ADTRAN or its suppliers be liable to Customer for any incidental,
special, punitive, exemplary or consequential damages experienced by either Cus-
tomer or a third party (including, but not limited to, loss of data or information, loss
of profits, or loss of use). ADTRAN is not liable for damages for any cause whatsoever
(whether based in contract, tort, or otherwise) in excess of the amount paid for the
item. Some states do not allow the limitation or exclusion of liability for incidental or
consequential damages, so the above limitation or exclusion may not apply to Cus-
tomer.

xi
Customer Service, Product Support Information, and Training
ADTRAN will replace or repair this product within five years from the date of ship-
ment if the product does not meet its published specification, or if it fails while in ser-
vice.
A return material authorization (RMA) is required prior to returning equipment to
ADTRAN. For service, RMA requests, training, or more information, see the toll-free
contact numbers given below.
Presales Inquiries and Applications Support
Please contact your local distributor, ADTRAN Applications Engineering, or
ADTRAN Sales:
Post-Sale Support
Please contact your local distributor first. If your local distributor cannot help, please
contact ADTRAN Technical Support and have the unit serial number available.
The Custom Extended Services (ACES) program offers multiple types and levels of ser-
vice plans which allow you to choose the kind of assistance you need. For questions,
call the ACES Help Desk.
Applications Engineering [phone]
Sales [phone]
Technical Support (888) 4ADTRAN
ACES Help Desk [phone]

xii
Repair and Return
If ADTRAN Technical Support determines that a repair is needed, Technical Support
will coordinate with the Custom and Product Service (CAPS) department to issue an
RMA number. For information regarding equipment currently in house or possible
fees associated with repair, contact CAPS directly at the following number:
Identify the RMAnumber clearly on the package (below address),and return to the fol-
lowing address:
ADTRAN Customer and Product Service
901 Explorer Blvd.
Huntsville, Alabama 35806
RMA # _____________
Training
The Enterprise Network (EN) Technical Training Department offers training on our
most popular products. These courses include overviews on product features and func-
tions while covering applications of ADTRAN's product lines. ADTRAN provides a va-
riety of training options, including customized training and courses taught at our
facilities or at your site. For more information about training, please contact your Terri-
tory Manager or the Enterprise Training Coordinator.
CAPS Department [phone]
Training - phone [phone], ext. 7500
Training - fax [phone]
Training - email [e-mail]

61202011L1-1 DSU III AR User Manual xiii
Table of Contents
List of Figures ..................................................................................................................... xix
List of Tables ....................................................................................................................... xxi
Chapter 1. Introduction
Product Overview ...............................................................................................................1-1
DDS Overview............................................................................................................... 1-2
4-Wire Switched 56 Overview..................................................................................... 1-2
Chapter 2. Installation
Unpack, Inspect, Power Up ............................................................................................... 2-1
ADTRAN Shipments Include...................................................................................... 2-1
Customer Provides ....................................................................................................... 2-1
Power Up........................................................................................................................2-2
Rear Panel ............................................................................................................................. 2-3
Network Interface Connection....................................................................................2-4
DTE Data Connection/Primary DTE.........................................................................2-4
Secondary Channel Connection..................................................................................2-4
Chapter 3. Operation
Front Panel Menu Structure .............................................................................................. 3-1
Main Menu.................................................................................................................... 3-1
Status ...................................................................................................................... 3-2
Test .......................................................................................................................... 3-2
Configuration (Config) ......................................................................................... 3-2
Dial .......................................................................................................................... 3-2
Basic Menu Travel......................................................................................................... 3-3
Enter ................................................................................................................. 3-3
Up Arrow ........................................................................................................ 3-3
Down Arrow .................................................................................................. 3-3

Table of Contents
xiv DSU III AR User Manual 61202011L1-1
Cancel ..............................................................................................................3-3
Front Panel ...........................................................................................................................3-5
LCD Window .................................................................................................3-5
Enter .................................................................................................................3-5
Numeric Keypad ............................................................................................3-5
Up and Down Arrows ...................................................................................3-5
Cancel ..............................................................................................................3-5
Shift ..................................................................................................................3-6
Quick ................................................................................................................3-6
LED Descriptions ..........................................................................................................3-6
Chapter 4. Configuration Overview
Local And Remote Configuration ....................................................................................4-1
Configuration Methods................................................................................................4-2
VT-100 Connection........................................................................................................4-5
AT Commands...............................................................................................................4-6
V.25 Bis Commands......................................................................................................4-7
SDLC Option .........................................................................................................4-7
Character Format ...........................................................................................4-7
Command Structure ......................................................................................4-7
Bi-Sync Option .......................................................................................................4-7
Character Format ...........................................................................................4-7
Command Structure ......................................................................................4-7
Asynchronous Option ..........................................................................................4-8
Character Format ...........................................................................................4-8
Command Structure ......................................................................................4-8
Command Descriptions ................................................................................4-8
Syntax and Possible Responses ...........................................................................4-9
CIC (Connect Incoming Call) .......................................................................4-9
CNL (Configuration Local) ........................................................................4-10
CNR (Configuration Remote) ....................................................................4-10
Switched 56 Operation .......................................................................................4-10
CRN (Call Request with Number) ............................................................4-10
CRS (Call Request Using Stored Number) ...............................................4-11
DIC(Disregard Incoming Call) ...................................................................4-11
PRN (Program Number) .............................................................................4-11
RLN (Request List of Numbers) ................................................................4-12
Chapter 5. Network Configuration
Network Options .................................................................................................................5-1
Loop Rate........................................................................................................................5-1

Table of Contents
61202011L1-1 DSU III AR User Manual xv
Network Address.......................................................................................................... 5-3
Remote Configuration.................................................................................................. 5-4
Network Type................................................................................................................ 5-5
Clock Source .................................................................................................................. 5-6
Chapter 6. Configuring DTE Options
DTE Options ........................................................................................................................ 6-1
DTE Rate.........................................................................................................................6-2
Connector Type............................................................................................................. 6-5
Data Format ................................................................................................................... 6-6
DTE Command Option................................................................................................ 6-7
Transmit Clock .............................................................................................................. 6-8
CS Options ................................................................................................................... 6-10
Anti-Stream.................................................................................................................. 6-12
Carrier Detect (CD) Options...................................................................................... 6-13
TR Options ................................................................................................................... 6-14
SR Options ................................................................................................................... 6-15
Auxiliary Port.............................................................................................................. 6-16
Chapter 7. Configuring Test Options
Test Options ......................................................................................................................... 7-1
Test Time-out................................................................................................................. 7-1
Remote Digital Loopback ............................................................................................ 7-2
EIA Local Loopback...................................................................................................... 7-3
EIA Remote Loopback.................................................................................................. 7-4
Chapter 8. Configuring Dial Options
Dial Options ......................................................................................................................... 8-1
Phone Number .............................................................................................................. 8-1
Auto Answer.................................................................................................................. 8-2
Chapter 9. Manual Command
Manual Command .............................................................................................................. 9-1
Using the Front Panel to Enter a Manual Command .............................................. 9-2
Chapter 10. Dial Selection
dial Options ........................................................................................................................ 10-1
Dial Stored Number.................................................................................................... 10-2
Enter Dial Number...................................................................................................... 10-2
Redial Last Number.................................................................................................... 10-2

Table of Contents
xvi DSU III AR User Manual 61202011L1-1
Chapter 11. Testing and Troubleshooting
TEST OVERVIEW ..............................................................................................................11-1
Initiating a Test............................................................................................................11-2
Test Status Display......................................................................................................11-3
Exiting a Test................................................................................................................11-3
Troubleshooting .................................................................................................................11-5
Messages from the DSU/CSU...................................................................................11-5
Troubleshooting New Installs...................................................................................11-6
Test Sequence for Troubleshooting New Installs or Existing Circuits ........11-8
Local Unit diagnostics ....................................................................................................11-10
DTE and Loop (LL)...................................................................................................11-12
Test Description .................................................................................................11-12
Test Purpose .......................................................................................................11-12
Initiating .............................................................................................................11-13
Interpreting Test Results ..................................................................................11-13
Loop Only (RT)..........................................................................................................11-14
Test Purpose .......................................................................................................11-14
Initiating .............................................................................................................11-15
Interpreting Test Results ..................................................................................11-15
DTE Only....................................................................................................................11-16
Test Purpose .......................................................................................................11-16
Initiating .............................................................................................................11-17
Interpreting Test Results ..................................................................................11-17
DTE With Test Pattern..............................................................................................11-18
Test Purpose .......................................................................................................11-18
Initiating .............................................................................................................11-19
Interpreting Test Results ..................................................................................11-19
Test Pattern ................................................................................................................11-20
Test Purpose .......................................................................................................11-20
Initiating .............................................................................................................11-21
Interpreting Test Results ..................................................................................11-21
Self Test.......................................................................................................................11-22
Test Purpose .......................................................................................................11-22
Initiating .............................................................................................................11-22
Interpreting Test Results ..................................................................................11-22
Remote Unit Diagnostics ................................................................................................11-23
Test Purpose .......................................................................................................11-24
Initiating .............................................................................................................11-24
Test Results ........................................................................................................11-24
Interpreting Test Results ..................................................................................11-25

Table of Contents
61202011L1-1 DSU III AR User Manual xvii
Chapter 12. Viewing Status Information
STATUS display ................................................................................................................ 12-1
DSU Operational Status............................................................................................. 12-2
DDS Network Status................................................................................................... 12-3
Network Rate............................................................................................................... 12-4
DTE Rate/Mode.......................................................................................................... 12-4
DTE Control Leads and Status..................................................................................12-4
Appendix A. Pinouts ....................................................................................................... A-1
Appendix B. AT Commands........................................................................................... B-1
Appendix C. Default Configuration Profiles ............................................................. C-1
Appendix D. EIA-232 Connector................................................................................... D-1
Appendix E. DSU to DSU Tail Circuit.......................................................................... E-1
Appendix F. Specifications Summary........................................................................... F-1
Appendix G. Acronyms/Abbreviations....................................................................... G-1
Appendix H. Glossary..................................................................................................... H-1
Index ............................................................................................................................Index-1

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xviii DSU III AR User Manual 61202011L1-1

61202011L1-1 DSU III AR User Manual xix
List of Figures
Figure 1-1. Sample Point-to-Point Application for DSU III AR................................... 1-2
Figure 2-1. DSU III AR RearView.................................................................................... 2-3
Figure 3-1. Main Menu LCD Display .............................................................................. 3-1
Figure 3-2. Example of Basic Menu Travel...................................................................... 3-4
Figure 3-3. DSU III AR Front View ..................................................................................3-5
Figure 4-1. Complete Configuration Menu .................................................................... 4-3
Figure 4-2. Configuration Menu with DTE Options ..................................................... 4-4
Figure 5-1. Setting Loop Rate Options ............................................................................5-2
Figure 5-2. Setting the Network Address........................................................................5-3
Figure 5-3. Enabling/Disabling Remote Configuration ............................................... 5-4
Figure 5-4. Setting Network Type Options..................................................................... 5-5
Figure 5-5. Setting the Clock Source................................................................................5-6
Figure 6-1. DTE Rates for 56 or 64 kbps Loop Rate with No Secondary Channel.... 6-2
Figure 6-2. DTE Rates for 56 kbps Secondary Channel and 64 kbps Loop Rates ..... 6-3
Figure 6-3. Selecting the Connector Type........................................................................ 6-5
Figure 6-4. Selecting Asynchronous or Synchronous Data Format ............................ 6-6
Figure 6-5. Selecting DTE Command Option.................................................................6-7
Figure 6-6. Transmit Clock Options................................................................................. 6-8
Figure 6-7. Selecting CS Options.................................................................................... 6-10
Figure 6-8. Anti-Stream Options .................................................................................... 6-12
Figure 6-9. Selecting CD Options................................................................................... 6-13
Figure 6-10. Selecting TR Options.................................................................................... 6-14
Figure 6-11. Setting SR Options........................................................................................ 6-15
Figure 6-12. Setting the Secondary Rate..........................................................................6-16
Figure 7-1. Setting Test Time-out Option ........................................................................ 7-1
Figure 7-2. Remote Digital Loopback.............................................................................. 7-2

List of Figures
xx DSU III AR User Manual 61202011L1-1
Figure 7-3. EIA Local Loopback Options........................................................................7-3
Figure 7-4. EIA Remote Loopback Options....................................................................7-4
Figure 8-1. Editing Stored Phone Numbers....................................................................8-1
Figure 8-2. Enabling/Disabling the Auto Answer Function........................................8-2
Figure 9-1. Menu Path for Manual Command...............................................................9-1
Figure 10-1. Dial Options Menu .......................................................................................10-1
Figure 10-2. Path to Storing Numbers Option................................................................10-2
Figure 11-1. Normal Operation Before Initiating Loopback Test ................................11-1
Figure 11-2. Initiating a Test.............................................................................................. 11-2
Figure 11-3. Sample Test Status Displays........................................................................ 11-3
Figure 11-4. Complete Test Menu..................................................................................... 11-4
Figure 11-5. DTE & Loop Test......................................................................................... 11-12
Figure 11-6. Initiating a DTE & Loop Test..................................................................... 11-13
Figure 11-7. Loop Only Test ............................................................................................ 11-14
Figure 11-8. Initiating a Loop Only Test........................................................................ 11-15
Figure 11-9. DTE Only Test Diagram............................................................................. 11-16
Figure 11-10.Initiating a DTE Only Test........................................................................ 11-17
Figure 11-11.DTE with Test Pattern................................................................................ 11-18
Figure 11-12.Initiating a DTE Test with Test Pattern................................................... 11-19
Figure 11-13.Test Pattern Only........................................................................................ 11-20
Figure 11-14.Initiating a Test Using a Test Pattern....................................................... 11-21
Figure 11-15.Initiating a Self Test ................................................................................... 11-22
Figure 11-16.V.54 RDL with Test Pattern....................................................................... 11-23
Figure 11-17.Initiating a Remote Test ............................................................................ 11-24
Figure 12-1. Examples of Status Displays .......................................................................12-1
Figure D-1. EIA-232 Connector.........................................................................................D-1
Figure E-1. DDS Tail Circuit ..............................................................................................E-2
Figure E-2. Standard EIA-232-D Crossover Cable .........................................................E-3