ADTRAN Network Router DSU 56 User Manual

DSU 56/64  
Data Service Unit  
User Manual  
Part Number 1200062L1  
61200062L1-1E  
May 2001  
 
The following conventions are used in this manual.  
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.  
Important Safety Instructions  
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 bathtub, 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 Important Safety Instructions  
iii  
 
 
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 user/ 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.  
iv  
 
 
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  
( ) 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  
v
 
 
( ) 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: _________________________  
vi  
 
FCC regulations require that the following information be provided 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 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.  
Service Type  
Digital Facility  
Interface Code  
Network  
Jacks  
56 kbps Digital Interface  
04DU5-56  
6.0F  
RJ-48S  
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 Chapter 2, Installation on page 2-1 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.  
vii  
 
   
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.  
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.  
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.  
viii  
 
   
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 users 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-  
panys 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.  
Users should not attempt to make such connections themselves, but  
should contract the appropriate electric inspection authority, or an elec-  
trician, as appropriate.  
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.  
ix  
 
 
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 work-  
manship. ADTRAN also warrants that products will conform to the applicable speci-  
fications 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.  
x
 
 
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 ADT-  
RAN Sales:  
Applications Engineering (800) 615-1176  
Sales  
(800) 827-0807  
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.  
Technical Support  
(888) 4ADTRAN  
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.  
ACES Help Desk  
(888) 874-2237  
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:  
CAPS Department  
(256) 963-8722  
xi  
 
             
Identify the RMA number 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.  
Training - phone  
Training - fax  
(800) 615-1176, ext. 7500  
(256) 963 7941  
Training - email  
xii  
 
 
List of Figures ...................................................................................................................... xv  
List of Tables ......................................................................................................................xvii  
Chapter 1. Introduction  
Product Overview ............................................................................................................... 1-1  
Front Panel ........................................................................................................................... 1-2  
LED Identification ................................................................................................. 1-2  
DTE Status (Green) ........................................................................................ 1-2  
Network Status (Red) .................................................................................... 1-2  
Test Status/ Error (Yellow/ Red) .................................................................. 1-3  
Test Switches ......................................................................................................... 1-3  
Rear Panel ............................................................................................................................. 1-4  
Chapter 2. Installation  
Unpack, Inspect, Power Up ............................................................................................... 2-1  
Contents of Shipping Package .................................................................................... 2-1  
Customer Provides ....................................................................................................... 2-1  
Power Up........................................................................................................................ 2-2  
Configuration ....................................................................................................................... 2-2  
Clear To Send (CS) - SW 1 ................................................................................... 2-2  
Down - Normal .............................................................................................. 2-2  
Up - On ............................................................................................................ 2-2  
Clear to Send Delay (CS Delay) - SW 2 .............................................................. 2-2  
Switch Position ............................................................................................... 2-2  
Down - Short .................................................................................................. 2-2  
Up - Long ........................................................................................................ 2-2  
Antistream - SW 3 ................................................................................................. 2-3  
Down - Off ...................................................................................................... 2-3  
Up - On ............................................................................................................ 2-3  
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DSU 56/64 User Manual  
xiii  
 
Table of Contents  
Down - 56 Kbps .............................................................................................. 2-4  
Up - 64 kbps .................................................................................................... 2-4  
Chapter 3. Test Modes  
DTE and Loop Test (LL) ..................................................................................................... 3-4  
Loop Only Test (RT) ............................................................................................................ 3-6  
Far End Tests ........................................................................................................................ 3-7  
Remote Digital ............................................................................................................... 3-7  
RDL with Test Pattern (TP).......................................................................................... 3-7  
Test Pattern (PTRN)...................................................................................................... 3-8  
Remote Tests ........................................................................................................................ 3-9  
Appendix A. Pinouts........................................................................................................ A-1  
Appendix B. Specifications ............................................................................................ B-1  
Index ............................................................................................................................Index-1  
xiv  
DSU 56/64 User Manual  
61200062L1-1  
 
Figure 1-1. DSU 56/ 64 Unit .............................................................................................. 1-2  
Figure 1-2. DSU 56/ 64 Rear Panel ................................................................................... 1-4  
Figure 3-1. DTE Only Test Diagram................................................................................. 3-2  
Figure 3-2. DTE with TP Test Diagram ........................................................................... 3-4  
Figure 3-3. DTE and Loop Test Diagram ........................................................................ 3-5  
Figure 3-4. Loop Only Test Diagram ............................................................................... 3-6  
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xv  
 
 
List of Figures  
xvi  
DSU 56/64 User Manual  
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List of Tables  
Table 2-1. Default Option Switch Settings .................................................................... 2-5  
Table A-1. Pinouts for RJ-48S Network Connections .................................................. A-1  
Table A-2. V.35 DTE Pinouts........................................................................................... A-2  
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List of Tables  
xviii  
DSU 56/64 User Manual  
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Chapter 1  
Introduction  
PRODUCT OVERVIEW  
The ADTRAN DSU 56/ 64, shown in Figure 1-1 on page 1- 2, is a  
technologically advanced, high performance Data Service/ Channel  
Service Unit (DSU/ CSU) that provides the interface between telco  
provided Digital Data Service (DDS) and the customers Data  
Terminal Equipment (DTE).  
The DSU 56/ 64 supports both 56 kbps and 64 kbps loop service  
rates with the DTE interface rate matching the selected loop rate. A  
synchronous V.35 interface is provided for the DTE interface.  
All setup or configuration is accomplished with a single eight-  
position DIP switch that is accessible from the back panel of the  
unit.  
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1-1  
 
     
Chapter 1. Introduction  
FRONT PANEL  
As shown in Figure 1-1, the front panel of the DSU 56/ 64 contains  
eleven light emitting diode (LED) indicators that display DTE  
interface, network, and test status. These indicators are defined in  
the LED Identification section, below.  
DSU 56/64  
TEST  
RS  
CS  
TD  
RD  
CD  
ALM  
DTE  
LOOP  
RDL  
PTRN ERROR  
SELECT  
TEST  
Figure 1-1. DSU 56/64 Unit  
LED Identification  
DTE Status (Green)  
Indicator Definition  
RS Request To Send DTE  
Source  
CS  
TD  
RD  
CD  
Clear To Send  
Transmit Data  
Receive Data  
Carrier Detect  
DSU  
DTE  
DSU  
DSU  
The active state for the status indicators (RS, CS, and CD) is On while  
the on state for the data indicators (TD and RD) represents a Space con-  
dition.  
Network Status (Red)  
ALM  
ON indicates a problem on the local loop or within the  
DDS network.  
OFF indicates normal loop and network conditions.  
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Chapter 1. Introduction  
Test Status/Error (Yellow/Red)  
DTE  
ON SOLID indicates DTE interface test in progress.  
FLASHING indicates Loop Interface test (CSU Loop-  
back) has been initiated by telco.  
Loop  
ON SOLID indicates loop interface test has been initiat-  
ed from local DSU.  
FLASHING indicates loop interface test (CSU or DSU  
Loopback) has been initiated by telco.  
RDL  
ON SOLID indicates remote digital loopback test has  
been initiated from the local DSU.  
FLASHING indicates remote digital loopback test has  
been initiated from the remote DSU.  
PTRN  
Error  
ON SOLID indicates that integral pattern generator is  
being utilized for testing.  
ON indicates that errors are being detected during a  
test or that a test can not be properly initiated.  
Tests defined by the above indicators are explained in greater detail  
in Chapter 3, Test Modes on page 3-1.  
Test Switches  
The front panel also contains two push-button switches for  
selecting and controlling the various test modes for the DSU 56/ 64.  
The descriptions of these switches are as follows:  
Select Each time this switch is activated, a valid test mode is in-  
dicated by one or more LEDs being turned on solid.  
Pressing the SELECT button from within an active test in-  
jects a bit error.  
Test  
Once the desired test mode is displayed on the test sta-  
tus indicators, the test is initiated by activating this  
switch. Pressing the TEST button again will terminate  
any test in progress.  
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1-3  
         
Chapter 1. Introduction  
REAR PANEL  
The rear panel of the DSU 56/ 64 is shown in Figure 1-2.  
synchronous DTE interface.  
The eight-pin modular jack (RJ-48S) labeled TELCO connects the  
DSU 56/ 64 to the DDS network.  
For pinouts to these connectors, see Table A-1, Pinouts for RJ-48S  
Network Connections, on page A-1 and Table A-2, V.35 DTE Pinouts,  
on page A-2.  
PRIMARY V.35  
TELCO  
OPTIONS  
(LISTED ON BOTTOM)  
1
2
3
4
5
6
7
8
115 V
60HZ .06A  
Figure 1-2. DSU 56/64 Rear Panel  
All setup or configuration parameters for the DSU 56/ 64 are  
selected with an eight-position DIP switch. This switch, labeled  
OPTIONS, is accessible from the rear panel. The label also references  
the options chart located on the bottom of the unit. The individual  
options are explained in detail in Chapter 2 in the section  
Configuration on page 2-2.  
The power cord on the rear panel of the DSU 56/ 64 is mechanically  
secured to the back panel and provides the connections to the  
integral AC/ DC power supply.  
1-4  
DSU 56/64 User Manual  
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Chapter 2  
Installation  
UNPACK, INSPECT, POWER UP  
Carefully inspect the DSU 56/ 64 for any shipping damages. If  
damage is suspected, file a claim immediately with the carrier and  
then contact ADTRAN Customer and Product Service (CAPS). If  
possible, keep the original shipping container for use in returning  
the unit for repair or for verification of damage during shipment.  
Contents of Shipping Package  
The following items are included in ADTRAN shipments of the  
DSU 56/ 64:  
The DSU 56/ 64 unit  
Network interface cable  
An 8-position modular to 8-position modular cable  
The DSU 56/ 64 User Manual  
Customer Provides  
V.35 cable  
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2-1  
               
Chapter 2. Installation  
Power Up  
The DSU 56/ 64 is equipped with a captive six-foot power cord that  
is terminated with a three-prong plug for connecting to a grounded  
power receptacle.  
Ensure that a grounded, 115 VAC, 60 Hz receptacle is used for powering  
the DSU 56/64 unit.  
CONFIGURATION  
The DSU 56/ 64 has eight options for controlling the operation of  
both the network and DTE interfaces. These options are selected by  
setting individual switches on either position DIP switch that is  
accessible from the rear panel. A chart showing the options and  
switch settings is attached to the bottom of the unit.  
Clear To Send (CS) - SW 1  
Down - Normal  
In the down position, CS follows the RS lead with the selected  
amount of delay. The only exceptions to this occur when network  
or test conditions prevent data from being transferred over the DTE  
interface. During these conditions CS is turned off.  
Up - On  
CS is forced on all the time.  
Clear to Send Delay (CS Delay) - SW 2  
Switch Position  
RS to CS Delay  
Down - Short  
250 µs + 125 µs  
Up - Long  
10 ms + 125 µs  
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Chapter 2. Installation  
Antistream - SW 3  
The Antistream option is used to select the antistream time out. The  
antistream time out is the maximum time the DSU 56/ 64 is allowed  
to transmit data from the DTE into the network. This feature  
prevents one DTE device on a multi-drop network from  
continuously tying up the transmit circuit from a remote DSU back  
to the master DSU.  
The antistream timer is reset to zero when RS transitions to the  
active state and is updated every second while RS is active. When  
the antistream time out expires, the DSU 56/ 64 stops transmitting  
DTE data into the network. It does, however, continue to accept  
data. CS is maintained in the active state until the DTE deactivates  
the RS input.  
Down - Off  
The Antistream timer is disabled.  
Up - On  
The Antistream timer is enabled and set for 45 +/ - 0.5 seconds.  
Carrier Detect (CD) - SE 4  
Down - Normal  
CD is on any time customer data is being received and off when the  
receive circuit is idle, not carrying customer data.  
Up - On  
CD is forced on all the time.  
Data Set Ready (SR) - SW 5  
Down - On  
SR is forced on all the time.  
Up - Normal  
SR is only turned off when the network is out of service or a test is  
in progress.  
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Chapter 2. Installation  
Remote Digital Loopback (RDL) - SW 6  
Down - Enable  
The DSU 56/ 64 accepts the industry standard V.54 RDL command  
from the far end of the circuit.  
Up - Disable  
The DSU 56/ 64 does not respond to the V.54 loopback command  
from the far end of the circuit.  
Loop Rate - SW 7  
Down - 56 Kbps  
The network interface of the DSU 56/ 64 is configured for operation  
at 56 kbps.  
Up - 64 kbps  
The network interface is configured for 64 kbps operation.  
Scrambler - SW 8  
For 64 kbps clear channel operation, there is a possibility that the  
DTE data sequenced might mimic network loop maintenance  
functions and erroneously cause other network elements to activate  
loopbacks. To prevent this, the Scrambler switch should be set to  
the Down (On) position.  
The SCRAMBLER ON option must be set the same for both the local  
and remote 56/ 64 DSUs for the situation described above.  
The option is only valid when the 64 kbps rate is selected.  
Down - On  
The scrambler is enabled.  
Up - Off  
The scrambler is disabled.  
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DSU 56/64 User Manual  
 
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Chapter 2. Installation  
Table 2-1. Default Option Switch Settings  
Setting  
Switch  
Position  
1
2
3
4
5
6
7
8
Down  
Down  
Down  
Down  
Up  
Down  
Down  
Down  
Clear to Send (CS) Normal  
CS Delay Short  
Anti-stream Timer Off  
Carrier Detect (CD) Normal  
Data Set Ready (SR) Normal  
Remote Digital Loopback (RDL) Enabled  
Loop Rate 56 Kbps  
Scrambler Enabled  
NETWORK CONNECTIONS  
This interface consists of four leads that are paired to provide  
separate transmit and receive circuits. The four leads are provided  
on the eight-position modular jack DSU RJ-48S labeled TELCO on  
the rear panel of the DSU 56/ 64.  
The pinouts for this connector are shown in Table A-1 on page A-1.  
DTE CONNECTIONS  
The Data Terminal Equipment (DTE) is attached to the connector  
labeled PRIMARY V.35 at the rear of the DSU 56/ 64.  
The pinout for the V.35 DTE connector is shown in Table A-2 on  
page A-2.  
A shielded V.35 cable is required to prevent possible radio frequency in-  
terference emissions.  
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Chapter 2. Installation  
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DSU 56/64 User Manual  
 
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Chapter 3  
Test Modes  
In addition to a self-test mode, the DSU 56/ 64 has other extensive  
test modes which are designed to help isolate problems to specific  
components of the communications circuit. These various test  
modes for the DSU 56/ 64 are initiated and terminated from the  
front panel using the SELECT and TEST buttons.  
SELF TEST  
A self-test goes through the following cycle.  
1. When the DSU 56/ 64 is powered on, all LEDs on the front  
panel turn on simultaneously for approximately two seconds.  
2. After two seconds, all the LEDs turn off briefly.  
3. The LEDs then cycle on in pairs with a fan-out pattern away  
from the ALM indicator.  
4. Next, the LEDs cycle off in pairs with a fan-in pattern back  
towards the ALM indicator.  
These patterns are repeated four times for visual verification that  
all LEDs are functioning properly.  
At the completion of the LED test patterns, the PTRN LED is on,  
which indicates that the DTE with TP test is being performed.  
If the test is successful, the ERROR indicator does not turn on.  
If the DTE WITH TP test fails, the RS, ALM, DTE, PTRN, and ERROR  
indicators all flash.  
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Chapter 3. Test Modes  
If an EPROM CHECKSUM failure is detected during self test, CS,  
ALM, PTRN, and ERROR indicators all flash at the end of the self  
test.  
NEAR END TESTS  
The local DSU 56/ 64 can perform the following near end tests:  
DTE Only  
DTE with Test Pattern  
DTE and LOOP (LL)  
Loop Only (RT)  
DTE ONLY TEST  
The DTE ONLY test can test both the DTE interface of the local DSU  
56/ 64 plus its loop transmitter and receiver. For this test, the loop  
transmit data is connected to the loop receive data at a point close  
to the physical network interface.  
The loopback point and the signal paths for this test are shown in  
Figure 3-1.  
56/64 DSU  
DTE or Test  
Equipment  
Interface  
Network  
Interface  
DTE  
Transmit  
Interface  
Loop  
Transmit  
Interface  
TD  
Loop TX  
DTE  
Only  
RD  
Loop RX  
DTE  
Receive  
Interface  
Loop  
Receive  
Interface  
Figure 3-1. DTE Only Test Diagram  
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To initiate the DTE ONLY test, perform the following steps:  
1. Press SELECT once to turn on the DTE test indicator.  
2. Press TEST while the test indicator is on.  
3. To terminate the test, press TEST.  
Test data from the terminal or test equipment is routed through the  
DTE section of the DSU 56/ 64 and then to the output of the loop  
transmitter section where the signal is encoded for transmission.  
The output of the loop transmitter is coupled back to the loop  
receiver input. The received test signal is then decoded and  
returned to the terminal or test equipment where it is checked for  
any bit errors.  
DTE WITH TEST PATTERN (TP)  
The DTE WITH TP test is similar to the DTE ONLY TEST described in  
Figure 3-1 on page 3-2. It is initiated at the local DSU 56/ 64 and is  
used to independently test the operation of the DSU 56/ 64.  
To initiate the DTE WITH TP test, perform the following steps:  
1. Press SELECT twice to turn on both the DTE and PTRN test  
indicators.  
2. Press TEST while these test indicators are on.  
3. To terminate this test, press TEST.  
Instead of using data from the terminal or test equipment, this test  
utilizes an internal test pattern generator and detector in the DSU  
56/ 64. The loopback point and the data paths for this test are  
illustrated in Figure 3-2 on page 3-4.  
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Chapter 3. Test Modes  
Test  
Pattern  
Generator  
56/64 DSU  
DTE or Test  
Equipment  
Interface  
Network  
Interface  
DTE  
Transmit  
Interface  
Loop  
Transmit  
Interface  
TD  
Loop TX  
DTE  
with  
Test Pattern  
RD  
Loop RX  
DTE  
Receive  
Interface  
Loop  
Receive  
Interface  
Test  
Pattern  
Detector  
Figure 3-2. DTE with TP Test Diagram  
The internal test pattern generator and detector of the DSU 56/ 64  
operate with a 2047 data pattern. When this test is initiated, the test  
pattern detector examines the receive data stream until  
synchronization to the 2047 pattern occurs. Once synchronized, the  
detector continues to check the receive data and reports any  
detected bit errors by turning on the ERROR LED.  
Once a test is initialized with the internal test pattern generator and  
detector, errors can be injected into the transmit data stream by  
pressing SELECT and observed by watching the ERROR LED turn  
on for a brief period of time. As previously mentioned, the DTE  
WITH TP is automatically performed during the self-test sequence  
for the DSU 56/ 64.  
DTE AND LOOP TEST (LL)  
This test is initiated at the local DSU 56/ 64 and allows independent  
testing of the separate sections of the DSU 56/ 64. This includes  
testing of the local DTE interface with data from the terminal or test  
equipment and testing of the loop interface section of the local DSU  
3-4  
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Chapter 3. Test Modes  
56/ 64 from the remote site over the actual communications circuit.  
Testing from the remote end of the circuit is performed with test  
data generated by the remote DSU or terminal type test equipment.  
The DTE AND LOOP test splits the DSU 56/ 64 into separate DTE and  
Loop interface sections and then loops the transmit data of each  
interface back to its respective receive data. Figure 3-3 illustrates  
the loopback points and the signal paths for this test. The DTE AND  
LOOP LEDs flash during initialization of the test and turn on solid  
once the test is in progress.  
56/64 DSU  
DTE or Test  
Equipment  
Interface  
Network  
Interface  
DTE  
Transmit  
Interface  
Loop  
Transmit  
Interface  
TD  
Loop TX  
DTE  
and  
Loop  
RD  
Loop RX  
DTE  
Receive  
Interface  
Loop  
Receive  
Interface  
Figure 3-3. DTE and Loop Test Diagram  
To initiate the DTE AND LOOP test, perform the following steps:  
1. Press SELECT three times to turn on both the DTE AND LOOP  
test indicators.  
2. Press TEST while these test indicators are on.  
3. To terminate this test, press TEST.  
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Chapter 3. Test Modes  
LOOP ONLY TEST (RT)  
The LOOP ONLY test or REMOTE LOOPBACK test (RT) is used to test  
the loop interface and a major portion of the DTE interface of the  
local DSU 56/ 64 from the remote site over the actual digital data  
circuit.  
For the LOOP ONLY test, the network receive data is looped to the  
network transmit data inside the DTE interface section of the DSU  
56/ 64. The physical DTE interface is ignored for this test. The LOOP  
LED flashes during initialization of the test and turns on solid once  
the test is in progress. Figure 3-4 illustrates the loopback point and  
the signal paths for this test.  
56/64 DSU  
Network  
DTE or Test  
Equipment  
Interface  
Interface  
DTE  
Transmit  
Interface  
Loop  
Transmit  
Interface  
TD  
Loop TX  
Loop  
Only  
RD  
Loop RX  
DTE  
Receive  
Interface  
Loop  
Receive  
Interface  
Figure 3-4. Loop Only Test Diagram  
To initiate the LOOP ONLY test, perform the following steps:  
1. Press SELECT four times to turn on the LOOP test indicator.  
2. Press TEST while this test indicator is on.  
3. To terminate this test, press TEST.  
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Chapter 3. Test Modes  
FAR END TESTS  
Remote Digital  
When the RDL test is initiated at the local DSU 56/ 64, it commands  
the remote DSU into loopback with the industry standard V.54  
loopback pattern. The loopback point and the signal paths for the  
remote DSU are the same as the LOOP ONLY test for a local DSU,  
shown in Figure 3-4 on page 3-6. This Loopback test is performed  
with data from the terminal or test equipment. The RDL LED  
flashes during initialization of the test and turns on solid once the  
test is in progress.  
To initiate the RDL test, perform the following steps:  
1. Press SELECT five times to turn on the RDL test indicator.  
2. Press TEST while this test indicator is on.  
3. To terminate this test, press TEST.  
RDL with Test Pattern (TP)  
When the RDL WITH TP test is initiated at the local DSU 56/ 64, the  
local DSU commands the remote DSU into loopback with the  
industry standard V.54 loopback pattern. The loopback point and  
the signal paths for the remote DSU are the same as the LOOP ONLY  
test for a local DSU; see Figure 3-4 on page 3-6. This LOOPBACK test  
is performed with data from the internal test pattern generator and  
error detector. The RDL and PTRN LEDs flash during initialization  
of the test and turn on solid once the test is in progress.  
To initiate the RDL WITH TP test, perform the following steps:  
1. Press SELECT six times to turn on both the RDL and PTRN test  
indicators.  
2. Press TEST while these test indicators are on.  
3. To terminate this test, press the TEST switch.  
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Test Pattern (PTRN)  
When the PTRN test is initiated, the local DSU 56/ 64 uses the  
integral test pattern generator to transmit a standard 2047 test  
pattern to the DSU on the far end of the circuit. The local DSU 56/  
64 then examines the received data for the standard 2047 pattern.  
Once this pattern is detected and synchronization is achieved, the  
ERROR indicator is turned off. The ERROR indicator turns on when  
errors in the receive data pattern are detected. While this test is  
active, errors can be injected into the transmit data stream by  
pressing the SELECT push-button. The PTRN LED flashes during  
initialization of the test and turns on solid once the test is in  
progress.  
To initiate the PTRN test, perform the following steps:  
1. Press SELECT seven times to turn on the PTRN test indicator.  
2. Press the TEST switch while this test indicator is on.  
3. To terminate this test, press TEST.  
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Chapter 3. Test Modes  
REMOTE TESTS  
The DSU 56/ 64 responds to three remotely activated tests.  
Remote Digital Loopback (RDL)  
CSU Loopback (LL)  
DSU Loopback (RT)  
The RDL test is initiated by a remote DSU and causes the local DSU  
56/ 64 to loopback. The loopback point is the same as the loop only  
point. See Figure 3-4 on page 3-6. This test is run to test the end-to-  
end performance of the circuit.  
Both the CSU LOOPBACK and the DSU LOOPBACK tests are  
activated from the telephone company diagnostic test equipment  
and are used to isolate trouble on a circuit.  
The CSU LOOPBACK, commonly called the LL test, has the same  
loopback points as the DTE AND LOOP test. It is used by the  
telephone company to test the integrity of the local loop.  
The DSU LOOPBACK, commonly called the RT test, has the same  
loopback point as the LOOP ONLY test and is used by the telephone  
company to test the operation of both the local loop and DTE  
interface sections.  
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Chapter 3. Test Modes  
3-10  
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61200062L1-1  
Appendix A  
Pinouts  
Table A-1. Pinouts for RJ-48S Network Connections  
Pin Number  
Function  
Signal Direction  
From Customer to Network Interface  
From Customer to Network Interface  
N/A  
1
Transmit Data (R)  
Transmit Data (T)  
Not Used  
2
3-6  
7
Receive Data (T-1) From Network Interface to Customer  
Receive Data (R-1) From Network Interface to Customer  
8
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A-1  
       
Appendix A. Pinouts  
Table A-2. V.35 DTE Pinouts  
Description  
Pin  
A
CCITT  
101  
102  
105  
106  
107  
109  
104  
104  
115  
115  
103  
103  
114  
114  
113  
113  
Protective Ground  
B
Signal Ground (SG)  
C
D
E
Request to Send (RS)  
Clear to Send  
Data Set Ready (SR)  
F
Receive Line Signal Detector (CD)  
Received Data (RD-A)  
R
T
Received Data (RD-B)  
V
Receiver Signal element Timing (SCR-A)  
Receiver Signal Element Timing (SCR-B)  
Transmitted Data (SD-A)  
X
P
S
Transmitted Data (SD-B)  
Y
Transmitter Signal element Timing (SCT-A)  
Transmitter Signal element Timing (SCT-B)  
External TX Signal element Timing (SCX-A)  
External TX Signal element Timing (SCX-B)  
AA  
U
W
A-2  
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Appendix B  
Specifications  
SPECIFICATIONS AND FEATURES  
The DSU 56/ 64 is a single stand-alone unit designed to be used  
either on a desktop or mounted on a wall.  
This section describes the standard specifications and features  
incorporated in the DSU 56/ 64.  
Loop Interface  
4-wire, full duplex  
Line Requirements  
Local loop specifications per AT&T Pub 62310  
Loop Rates  
56 kbps or 64 kbps  
Receiver Sensitivity  
-45 dB  
DTE Interfaces  
V.35 synchronous  
DTE Operating Modes  
Full or half duplex  
DTE Data Rates  
56 kbps or 64 kbps synchronous  
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Appendix B. Specifications  
Diagnostics  
Network test center activated:  
CSU loopback on sealing current reversal in local loop  
DSU loopback  
User activated:  
Self test,  
Local loopback,  
V.54 activated remote loopback with 2047 test pattern  
DTE data/ data from external test set  
Power  
115 VAC  
4 Watts (maximum)  
Environment  
Operating Temperature: 0o C to 50o C (32o F to 122o F  
Storage Temperature: - 20o C to 70o C (-4o F to 158o F)  
Relative Humidity: Up to 95%, non-condensing  
Hardware Specifications  
Dimensions: 1.56 inches H, 6.50 inches W, 8.32 inches L  
Weight: 1.5 pounds  
B-2  
DSU 56/64 User Manual  
 
61200062L1-1  
     
Index  
FCC regulations, vii  
features of DSU 56/ 64, B-1  
A
ACES help desk, xi  
affidavit  
description and drawing, 1-2  
LED identification, 1-2  
test switches, 1-3  
connection for digital services, iv  
connection of CPE equipment, v  
antistream - SW-1, 2-3  
Applications engineering  
how to contact, xi  
how to contact, xi  
C
cables  
included with shipment, 2-1  
provided by customer, 2-1  
Canadian emissions requirements, viii  
Canadian equipment limitations, ix  
CAPS department  
LED identification  
DTE status 1-2  
for front panel, 1-2  
Network Status, 1-2  
test status/ error 1-3  
Loop Only Test 3-6  
loop rate - SW-7, 2-4  
how to contact, xi  
carrier detect (CD) - SE-4, 2-3  
clear to send (CS) SW-1, 2-2  
clear to send delay (CS delay) - SW-2, 2-2  
configuration  
for network and DTE interfaces, 2-2  
customer service, xi  
network connections, 2-5  
LED identification, 1-2  
D
pinouts  
data set ready (SR) - SW-5, 2-3  
diagnostics, of DSU 56/ 64, B-2  
DTE and Looptest 3-4  
DTE connections, 2-5  
DTE status  
LED identification, 1-2  
DTE with TP test 3-3  
DTE-only test 3-2  
RJ-48S network connections, A-1  
V.35 DTE, A-2  
description of, 2-2  
power features, B-2  
product overview, 1-1  
product warranty, x  
PTRN test 3-8  
E
R
environmental specifications, B-2  
rear panel  
F
description and graphic, 1-4  
remote digital loopback (RDL) - SW-6, 2-4  
remote digital test 3-7  
Far End Tests 3-7  
FCC radio frequency interference, viii  
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Index-1  
 
Index  
remote tests 3-9  
DTE and Loop Test, 3-4  
DTE with Test pattern test, 3-3  
DTE-only test, 3-2  
Far End Tests, 3-7  
loop only test, 3-6  
PTRN test, 3-8  
remote digital, 3-7  
remote tests, 3-9  
self-test 3-1  
repair and return information, xi  
RJ-48S network connections,  
pinouts, A-1  
RMA requests xi  
S
safety instructions, iii  
scrambler - SW-8, 2-4  
self-test mode 3-1  
service type information vii  
shipping damage  
what to do 2-1  
test status/ error  
LED identification, 1-3  
test switches  
on front panel 1-3  
training information  
how to contact, xii  
shipping package  
contents of, 2-1  
specifications B-1  
V
T
V.35 DTE pinouts, A-2  
technical support  
how to contact, xi  
test modes 3-1  
W
warranty, x  
Index-2  
DSU 56/64 User Manual  
 
61202062L1-1  

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