ADTRAN DSU III ARdc User manual

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&CVC"5GTXKEG"7PKV
2CTV"0WODGT"3422492.3
&QEWOGPV"0WODGT"83422492.3/42#
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Trademarks:
Hayes is a registered trademark of Hayes Microcomputer Products,
Inc.
901 Explorer Boulevard
P.O. Box 140000
Huntsville, AL 35814-4000
[phone]
© 2000 ADTRAN, Inc.
All Rights Reserved.
Printed in U.S.A.

iii
Notes provide additional useful information.
Cautions signify information that could prevent service
interruption.
Warnings provide information that could prevent dam-
age to the equipment or endangerment to human life.

iv
IMPORTANT SAFETY INSTRUCTIONS
Save These Instructions
When using your telephone equipment, please follow these basic safe-
ty precautions to reduce the risk of fire, electrical shock, orpersonal in-
jury:
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 indicat-
ed in the manual. Do not dispose of batteries in a fire. They may
explode. Check local codes for any special disposal instructions.

v
FCC regulations require that the following information be pro-
vided in this manual:
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 requested, provide this information to the tele-
phone company.
2. If this equipment causes harm to the telephone network, the tele-
phone 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 custom-
er of the right to file a complaint with the FCC.
3. The telephone company may make changes in its facilities, equip-
ment, operations, or procedures that could affect the proper oper-
ation of this equipment; advance notification and the opportunity
to maintain uninterrupted service is given.
4. If experiencing difficulty with this equipment, please contact
ADTRAN for repair and warranty information. The telephone
company may require this equipment to be disconnected from the
network until the problem is corrected or it is certain the equip-
ment is not malfunctioning.
5. This unit contains no user serviceable parts.
6. An FCC compliant telephone cord with a modular plug is provid-
ed with this equipment. This equipment is designed to be connect-
ed to the telephone network or premises wiring using an FCC
compatible modular jack, which is Part 68 compliant.
7. The following information may be required when applying to the
local telephone company for leased line facilities.
Service Type Digital Facility
Interface Code Service Order Code Network Jacks
2.4 kbps Digital Interface 04DU5-24 6.0F RJ-48S
4.8 kbps Digital Interface 04DU5-48 6.0F RJ-48S
9.6 kbps Digital Interface 04DU5-96 6.0F RJ-48S
19.2 kbps Digital Interface 04DU5-19 6.0F RJ-48S
38.4 kbps Digital Interface 04DU5-38 6.0F RJ-48S
56 kbps Digital Interface 04DU5-56 6.0F RJ-48S
64 kbps Digital Interface 04DU5-64 6.0F RJ-48S
PSDS Type 1 04DU5-56B 6.0F RJ-48S

vi
FEDERAL COMMUNICATIONS COMMISSION RADIO
FREQUENCY INTERFERENCE STATEMENT
This equipment has been tested and found to comply with the limits
fora Class Bdigital device, pursuantto Part 15 oftheFCCRules. These
limits are designed to provide reasonable protection against harmful
interference in a residential environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interfer-
ence 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.
CANADIAN EMISSIONS REQUIREMENTS
This digital apparatus does not exceed the Class B limits for radio
noise emissions from digital apparatus as set out in the interference-
causing equipment standard entitled "Digital Apparatus," ICES-003 of
the Department of Communications.
Cet appareil nuerique respecte les limites de bruits radioelectriques
applicables aux appareils numeriques de Class B prescrites dans la
norme sur le materiel brouilleur: "Appareils Numeriques," NMB-003
edictee par le ministre des Communications.
Shielded cables must be used with this unit to ensure
compliance with Class B FCC limits.
Changes or modifications to this unit not expressly ap-
proved by ADTRAN will void the user's authority to
operate the equipment.

vii
CANADIAN EQUIPMENT LIMITATIONS
Notice: The Canadian Industry and Science Canada label identifies
certified equipment. 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, ensure that it is permissible to be
connected to the facilities of the local telecommunications company.
The equipment must also be installed using an acceptable method of
connection. In some cases, the company’s inside wiring associated
with a single-line individual service may be extended by means of a
certified connector assembly (telephone extension cord). Compliance
with the above conditions may not prevent degradation of service in
some situations.
Repairs to certified equipment should be made by an authorized Ca-
nadian maintenance facility designated by the supplier. Any repairs
or alterations made by the user to this equipment, or equipment mal-
functions, may give the telecommunications company cause to re-
quest 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 prevent overloading. The termination on a
loop may consist of any combination of devices subject only to the re-
quirement 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 contact the appropriate electric
inspection authority, or an electrician, as appropriate.

viii
WARRANTY AND CUSTOMER SERVICE
ADTRAN willreplace or repairthis productwithin fiveyearsfrom the
date of shipment if it does not meet its published specifications or fails
while in service. For detailed warranty, repair, and return information
refer to the ADTRAN Equipment Warranty and Repair and Return
Policy Procedure.
Return Material Authorization (RMA) is required prior to returning
equipment to ADTRAN.
For service, RMA requests, or further information, contact one of the
numbers listed in the back of this manual.

ix
LIMITED PRODUCT WARRANTY
ADTRAN warrants that for ten (10) 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 WAR-
RANTIES (EXPRESSED OR IMPLIED). ADTRAN SPECIFICALLY
DISCLAIMS ALL OTHER WARRANTIES, INCLUDING (WITHOUT
LIMITATION), ALL WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE. SOME STATES DO NOT
ALLOW THE EXCLUSION OF IMPLIED WARRANTIES, 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 dam-
ages experienced by either Customer 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 exclu-
sion of liability for incidental or consequential damages, so the above
limitation or exclusion may not apply to Customer.

x

61200270L1-20 DSU III ARdc User Manual xi
Table of Contents
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
Receipt Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Equipment Provided . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Network Interface Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
DTE Data Connection/Primary DTE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Configuration Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
V.25 bis Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
SDLC Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Character Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Command Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Bi-Sync Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Character Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Command Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Asynchronous Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Character Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Command Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Command Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Syntax and Possible Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
CIC (Connect Incoming Call) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
CNL (Configuration Local) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
CNR (Configuration Remote) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Switched 56 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
CRN (Call Request with Number) . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
CRS (Call Request Using Stored Number) . . . . . . . . . . . . . . . . . . 2-11

xii DSU III ARdc User Manual 61200270L1-20
Table of Contents
DIC (Disregard Incoming Call) . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
PRN (Program Number) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
RLN (Request List of Numbers) . . . . . . . . . . . . . . . . . . . . . . . . . . .2-12
Chapter 3. Operation
Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
LCD Display of the Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Configuration (CONFIG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Dial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Basic Menu Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
LCD Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Enter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Up and Down Arrows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Cancel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Numeric Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
Quick . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
LED Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
Rear Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
Chapter 4. Configuration Overview
Local and Remote Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
Chapter 5. Configuring Network Options
Network Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Loop Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1
Network Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Remote Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3
Network Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4
Clock Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5
Chapter 6. Configuring DTE Options
DTE Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
DTE Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
Connector Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-5

61200270L1-20 DSU III ARdc User Manual xiii
Table of Contents
DTE Command Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Transmit Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
CS Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Anti-Stream . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10
CD Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
TR Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
SR Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Chapter 7. Configuring Test Options
Test Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Test Timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Remote Digital Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
EIA Local Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
EIA Remote Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
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
Chapter 10. Dial Selection
Dial Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Dial Stored # . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Enter Dial # . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
Redial Last # . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2
Chapter 11. Testing and Troubleshooting
TEST OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Initiating a Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
Test Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-2
Exiting a Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
Messages from the DSU/CSU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-5
Troubleshooting New Installs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-7
Troubleshooting New Installs or Existing Circuits . . . . . . . . . . . . . 11-8
Local Unit diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-9
DTE & Loop (LL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-10

xiv DSU III ARdc User Manual 61200270L1-20
Table of Contents
Test Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-10
Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-11
Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-11
Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12
Loop Only (RT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12
Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12
Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12
Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-13
DTE Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-13
Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-14
Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-14
Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-15
DTE With Test Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-15
Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-15
Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-15
Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-16
Test Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-16
Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-17
Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-17
Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-18
Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-18
Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-18
Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-18
Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-19
Remote Unit Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-19
Test Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-20
Initiating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-20
Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-21
Interpreting Test Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-21
Chapter 12. Status Selection
STATUS display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-1
DSU Operational Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2
DATA MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2
UNIT IN TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2
DTE COMMAND MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2
IDLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2
INCOMING CALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2
DIALING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2
DDS Network Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-2

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Table of Contents
LOOP IS NORMAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-2
OPEN LOOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
NO RX SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
CHECK TELCO LINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
OOS/OOF FROM NET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
NO FRAME SYNC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
TEST FROM TELCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
RATE ADAPTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
ANSWERING CALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
NO WINK FROM CO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
CALL DISCONNECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
Network Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
DTE Rate/Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
DTE Control Leads and Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
Appendix A. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1
Appendix B. Default Configuration Profiles. . . . . . . . . . . . . . . . . . . . .B-1
Appendix C. DSU-to-Modem Interconnect . . . . . . . . . . . . . . . . . . . . . .C-1
Appendix D. EIA-232 Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1
Appendix E. Specifications Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . E-1
Appendix F. Glossary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

xvi DSU III ARdc User Manual 61200270L1-20
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61200270L1-20 DSU III ARdc User Manual xvii
List of Figures
Figure 1-1. Sample Point-to-Point Application for DSU III ARdc . . . 1-2
Figure 3-1. Example of Basic Menu Travel . . . . . . . . . . . . . . . . . . . . . . 3-4
Figure 3-2. DSU III ARdc Front View. . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Figure 3-3. DSU III ARdc Rear View. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Figure 4-1. Complete Configuration Menu . . . . . . . . . . . . . . . . . . . . . . 4-3
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 . . . . . . . . . . . . . . . 6-1
Figure 6-2. DTE Rates for Loop Rates of 2.4, 9.6, 19.2, and 38.4 kbps 6-3
Figure 6-3. Selecting the Connector Type. . . . . . . . . . . . . . . . . . . . . . . . 6-4
Figure 6-4. Selecting Data Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Figure 6-5. Selecting DTE Command Option . . . . . . . . . . . . . . . . . . . . 6-6
Figure 6-6. Transmit Clock Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Figure 6-7. Selecting CS Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Figure 6-8. Anti-Stream Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Figure 6-9. Selecting CD Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Figure 6-10. Selecting TR Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Figure 6-11. Setting SR Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Figure 7-1. Setting Test Timeout Option . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Figure 7-2. Remote Digital Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
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. Manual Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
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

xviii DSU III ARdc User Manual 61200270L1-20
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Figure 11-3. Sample Test Status Displays . . . . . . . . . . . . . . . . . . . . . . . .11-3
Figure 11-4. Complete Test Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-4
Figure 11-5. DTE & Loop Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-11
Figure 11-6. Initiating a DTE & Loop Test. . . . . . . . . . . . . . . . . . . . . . .11-11
Figure 11-7. Loop Only Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12
Figure 11-8. Initiating a Loop Only Test . . . . . . . . . . . . . . . . . . . . . . . .11-13
Figure 11-9. DTE Only Test Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . .11-14
Figure 11-10. Initiating a DTE Only Test. . . . . . . . . . . . . . . . . . . . . . . . .11-14
Figure 11-11. DTE with Test Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-15
Figure 11-12. Initiating a DTE Test with Test Pattern . . . . . . . . . . . . . .11-16
Figure 11-13. Test Pattern Only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-17
Figure 11-14. Initiating a Test Using a Test Pattern. . . . . . . . . . . . . . . .11-18
Figure 11-15. Initiating a Self Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-19
Figure 11-16. V.54 RDL with Test Pattern. . . . . . . . . . . . . . . . . . . . . . . .11-20
Figure 11-17. Initiating a Remote Test . . . . . . . . . . . . . . . . . . . . . . . . . . .11-20
Figure 12-1. Examples of Status Displays . . . . . . . . . . . . . . . . . . . . . . . .12-1
Figure C-1. DSU-to-Modem Interconnect . . . . . . . . . . . . . . . . . . . . . . . C-1
Figure D-1. EIA-232 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

61200270L1-20 DSU III ARdc User Manual xix
List of Tables
Table 2-1. Pin Assignments for Telco Connector. . . . . . . . . . . . . . . . . . 2-2
Table 2-2. Pin Assignments for Primary EIA-232 Connector. . . . . . . . 2-4
Table 2-3. Pin Assignments for Primary V.35 Connector. . . . . . . . . . . 2-5
Table 2-4. Configuration Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Table 3-1. Identification of Numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Table 5-1. Loop Rate Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Table 5-2. Network Address Command . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Table 5-3. Remote Configuration Commands . . . . . . . . . . . . . . . . . . . . 5-4
Table 5-4. Network Type Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Table 5-5. Clock Source Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Table 6-1. DTE Rate AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Table 6-2. Scrambler On/Off AT Commands . . . . . . . . . . . . . . . . . . . . 6-2
Table 6-3. Data Format Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Table 6-4. Transmit Clock AT Commands . . . . . . . . . . . . . . . . . . . . . . . 6-7
Table 6-5. CS Options AT Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Table 6-6. Short and Long Delays at Different Operating Speeds. . . 6-10
Table 6-7. Anti-Stream AT Commands. . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Table 6-8. CD Options AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Table 6-9. TR Options AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
Table 6-10. SR Options AT Commands. . . . . . . . . . . . . . . . . . . . . . . . . . 6-15
Table 7-1. Test Timeout AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Table 7-2. Remote Digital Loopback AT Commands . . . . . . . . . . . . . . 7-2
Table 7-3. EIA Local Loopback AT Commands. . . . . . . . . . . . . . . . . . . 7-3
Table 7-4. EIA Remote Loopback AT Commands. . . . . . . . . . . . . . . . . 7-4
Table 8-1. AT Command for Storing Phone Numbers . . . . . . . . . . . . . 8-2
Table 8-2. AT Commands for Auto Answer. . . . . . . . . . . . . . . . . . . . . . 8-2
Table 9-1. Manual Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
Table 11-1. Messages from the DSU/CSU . . . . . . . . . . . . . . . . . . . . . . . 11-5
Table 11-2. Troubleshooting New Installs . . . . . . . . . . . . . . . . . . . . . . . 11-7
Table 11-3. Test AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-9
Table 11-4. DTE With Test Pattern Commands . . . . . . . . . . . . . . . . . . 11-10
Table 11-5. Remote Tests and AT Commands . . . . . . . . . . . . . . . . . . . 11-19
Table A-1. AT Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1

xx DSU III ARdc User Manual 61200270L1-20
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Table B-1. Default Configuration Profiles . . . . . . . . . . . . . . . . . . . . . . . B-2