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Chapter 11. Testing and Troubleshooting

11-8

DSU III ARdc User Manual

61200270L1-20

Troubleshooting New Installs or Existing Circuits

If an external BERT tester is available, these additional tests may be per-
formed:

•

DTE & Loop Test

•

DTE Only Test

•

Loop Only Test

If the unit fails any of these tests or the problem has not been determined,
contact ADTRAN Technical Support; see the back of this manual.

If your DSU ....

then...

is suspected of having problems

perform a Self Test to determine
whether the unit is in good health.

is receiving excessive errors requiring
retransmission of data

perform a DTE with Test Pattern Test
to determine if the unit's internal
transmitter and receiver is operating
error free.

continues to receive excessive errors
requiring retransmission of data

perform a Remote Test to verify an
error-free connection between the local
and remote unit. Run the test using all
available test patterns.

Summary of Contents for 1200270L1

Page 1: ...57 4FE CVC 5GTXKEG 7PKV 2CTV 0WODGT 3422492 3 QEWOGPV 0WODGT 83422492 3 42 CPWCT 4222...

Page 2: ...emarks Hayes is a registered trademark of Hayes Microcomputer Products Inc 901 Explorer Boulevard P O Box 140000 Huntsville AL 35814 4000 256 963 8000 2000 ADTRAN Inc All Rights Reserved Printed in U...

Page 3: ...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 h...

Page 4: ...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...

Page 5: ...ifficulty 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 correc...

Page 6: ...ich 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 fr...

Page 7: ...uipment 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...

Page 8: ...ifications 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...

Page 9: ...y 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 CONSTITUTE...

Page 10: ...x...

Page 11: ...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 Struct...

Page 12: ...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 Ove...

Page 13: ...ter 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...

Page 14: ...est 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...

Page 15: ...T 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 App...

Page 16: ...xvi DSU III ARdc User Manual 61200270L1 20 Table of Contents...

Page 17: ...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...

Page 18: ...nly 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...

Page 19: ...lock 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 1...

Page 20: ...xx DSU III ARdc User Manual 61200270L1 20 List of Tables Table B 1 Default Configuration Profiles B 2...

Page 21: ...4 kbps including 19 2 and 38 4 kbps services The DSU III ARdc may be used in either point to point or multi point circuits The DSU III ARdc provides both V 35 and EIA 232 electrical and physical DTE i...

Page 22: ...unit can be configured to run slower DTE rates async or sync 4 Wire Switched 56 Overview This switched 4 wire DDS allows customers to pay for data connection only for the time the unit is active The...

Page 23: ...repair or for verification of damage during shipment Equipment Provided The following items are included in ADTRAN shipments of the DSU III ARdc DSU III ARdc unit An 8 position modular to 8 position m...

Page 24: ...ccessible disconnect device that is suitably approved and rated should be incorporated in the fixed wiring NETWORK INTERFACE CONNECTION The DSU III ARdc s eight position modular jack labeled TELCO con...

Page 25: ...V 35 The pin assignments for the connectors are listed in Table 2 2 on page 2 4 and Table 2 3 on page 2 5 The V 35 connector is recommended for use with data rates above 19 2 kbps The EIA 232 connecto...

Page 26: ...Data TD 3 BB Receive Data RD 4 CA Request to Send RS 5 CB Clear to Send CS 6 CC Data Set Ready SR 7 AB Signal Ground SG 8 CF Received Line Signal Detector CD 9 12 Test Point 10 12 Test Point 15 DB Tra...

Page 27: ...rimary V 35 Connector Pin CCITT Description A 101 Protective Ground PG B 102 Signal Ground SG C 105 Request to Send RS D 106 Clear to Send CS E 107 Data Set Ready SR F 109 Received Line Signal Detecto...

Page 28: ...files Configuration Methods The DSU III ARdc provides methods for both local and remote configura tion These methods are shown in Table 2 4 AT Commands The DSU III ARdc can be configured and controlle...

Page 29: ...with spaces for readability The maximum length for a command line is 40 characters Each command line is executed by the DSU III ARdc upon receipt of a terminating charac ter The default terminating c...

Page 30: ...e to follow while the 13H in the control field indicates the final frame Bi Sync Option Character Format Data bits 7 Parity bit Odd Command Structure SYN SYN STX V 25 bis COMMAND ETX Asynchronous Opti...

Page 31: ...ored number DIC Disregard incoming call PRN Program number RLN Request list of numbers VAL Valid V 25 command processed CFIET Call failed on switched network busy detected CFIDE Call failed on switche...

Page 32: ...nd has the following format CNL LOCAL PASSWORD AT ONE OR MORE AT COMMANDS A local password may not be required depending on the present configu ration of the unit Responses to CNL commands are returne...

Page 33: ...ified register The format of this command is as follows CRS OPTIONAL SPACE REGISTER NUMBER 1 10 If this command is issued without the register number parameter the IN VPS Invalid Parameter Syntax resp...

Page 34: ...re issued with this command the specified register is cleared The DSU responds with VAL RLN Request List of Numbers This command causes the DSU III ARdc to return the number stored in the specified re...

Page 35: ...STATUS TEST CONFIGURATION and DIAL Each MAIN menu item has several functions and sub menus to identify and access specific parameters LCD Display of the Main Menu Main Menu The following paragraphs br...

Page 36: ...e 11 1 Configuration CONFIG CONFIGURATION is used to select network and DTE operating parameters to configure testing and dialing options and to enter a manual command This menu branch is divided into...

Page 37: ...3 1 on page 3 4 illustrate how to select the DSU III ARdc Loop Rate option 1 Select CONFIGURATION CONFIG by pressing 3 and then pressing Enter 2 Select LOCAL or REMOTE test by pressing the correspondi...

Page 38: ...on Figure 3 2 DSU III ARdc Front View LCD Window Displays menu items and messages in 2 lines by 16 characters Enter Selects active menu items To activate a menu item press the number of the item When...

Page 39: ...he numeric keypad contains the numbers 0 through 9 and alpha charac ters A through F which are used to activate menu items or enter parame ters Shift Enter alpha characters by first pressing and relea...

Page 40: ...or EIA 232 connection An 8 pin telco jack a DC power connector and a power switch are also located on the rear panel Pin assignments for the DTE and network connections are listed in Installation on p...

Page 41: ...ARdc Rear View Table 3 1 Identification of Numbers Number Item Function 1 Telco Connection Connection to the dedicated circuit 2 EIA 232 DTE interface 3 V 35 High speed DTE interface 4 24 to 48 VDC C...

Page 42: ...Chapter 3 Operation 3 8 DSU III ARdc User Manual 61200270L1 20...

Page 43: ...lt Configura tion Profiles on page B 1 The unit is shipped from the factory with profile number 1 default configuration loaded into the current nonvolatile con figuration memory If profile 1 matches r...

Page 44: ...r detailed information on configuration see Configuring Network Options on page 5 1 Configuring DTE Options on page 6 1 Configuring Test Options on page 7 1 Configuring Dial Options on page 8 1 and Ma...

Page 45: ...PTIONS 4 V 25 BSC ASYNC ENTER TIMEOUT 5 TRANSMIT CLOCK 1 NORMAL 1 FORCED ON 1 TEST TIMEOUT 0 OFF 00 SEC 2 EXTERNAL 2 FOLLOWS RS 6 CS OPTIONS 3 FOLLOWS CD 2 RDL EN DIS 1 RDL IGNORED 2 RDL ACCEPTED 7 AN...

Page 46: ...Chapter 4 Configuration Overview 4 4 DSU III ARdc User Manual 61200270L1 1...

Page 47: ...et Command Accepted is displayed briefly before returning to the active menu Loop Rate The LOOP RATE option sets the loop operating speed The unit should be set to the rate required by the DDS service...

Page 48: ...s and format selections are listed in Table 5 1 with the equivalent AT commands that perform the same configuration functions Table 5 1 Loop Rate Commands Front Panel AT Command 1 AUTO B0 2 2 4K B1 3...

Page 49: ...Table 5 2 shows the AT command used to set the network address Remote Configuration This option sets up the DSU III ARdc to accept or reject remote configura tion commands Figure 5 3 on page 5 4 shows...

Page 50: ...or the specific type of network being used The factory default setting is DEDICATED see Figure 5 4 on page 5 5 Table 5 3 Remote Configuration Commands Front Panel AT Command Description 1 DISABLE P4 D...

Page 51: ...NETWORK see Figure 5 5 on page 5 6 Table 5 4 Network Type Commands Front Panel AT Command Description 1 DEDICATED L0 Any 4 wire DDS network 2 AT T MCI L1 AT T MCI Switched 56 service 3 US SPRINT L2 U...

Page 52: ...AT commands for setting the clock source Select MASTER timing only if the circuit has no timing source for example two DSUs and a crossover cable Table 5 5 Clock Source Commands Front Panel AT Comman...

Page 53: ...Figure 6 2 on page 6 3 The factory default setting is SAME AS LOOP Figure 6 1 DTE Rates for 56 or 64 kbps Loop Rate The equivalent AT commands for setting the DTE rate for a 56 kbps loop rate are sho...

Page 54: ...DTE rate 4 8K sync and async 3 DTE 9 6K K5 DTE rate 9 6K sync and async 4 DTE 19 2K K6 DTE rate 19 2K sync and async 5 DTE 38 4K K7 DTE rate 38 4K sync and async 6 DTE 56K 57 6K K8 DTE rate 56K sync o...

Page 55: ...DATA FORMAT 3 CONFIG 2 DTE OPTIONS 4 DTE CMD OPTION 2 REMOTE ENTER ADDRESS 5 TRANSMIT CLOCK 6 CS OPTIONS 7 ANTI STREAM 8 CD OPTIONS 9 TR OPTIONS 3 TEST OPTIONS A SR OPTIONS 4 DIAL OPTIONS 5 MANUAL CO...

Page 56: ...sed to set the connector type The factory default setting is V 35 There are no AT commands available to set the connector type Figure 6 3 Selecting the Connector Type 1 NETWORK OPT 1 DTE RATE 1 EIA 23...

Page 57: ...ands Front Panel AT Command Description 1 ASYNCHRONOUS Q0 Always asynchronous 2 SYNCHRONOUS Q2 Always synchronous For asynchronous options select the length of the data bytes 1 ASYNC 9 BITS N A 9 bits...

Page 58: ...ption or from escape sequence in AT mode with AT COMMAND SET or V 25 SYNC selected the DTE format is independent of the DATA FORMAT option However if V 25 BSC ASYNC is selected the unit will use V 25...

Page 59: ...he EXTERNAL clock option is also recommended when the EIA 232 con nector is used for 56 kbps and 64 kbps applications A special DSU cable diagram for this application is shown in Appendix D EIA 232 Co...

Page 60: ...f the options chosen involves request to send RS then the delay from RS to CS must be selected Table 6 5 on page 6 9 shows the AT Com mands used to set the CS OPTIONS 1 NETWORK OPT 1 DTE RATE 2 CONNEC...

Page 61: ...FOLLOWS CD R2 CS off when CD goes off or if DSU cannot pass data 4 FOLLOWS RS CD R3 CS follows RS after delay and also off if CD off If CD goes off after RS is on DSU III ARdc will turn off CS but con...

Page 62: ...ing up the transmit circuit back to the master DSU The anti stream timer is reset to zero when RS changes to the active state and is updated every second while RS is active When the anti stream tim eo...

Page 63: ...TIMER OFF T0 Anti stream timer disabled 2 TIME 10 SEC T1 Timeout equals 10 seconds 3 TIME 30 SEC T2 Timeout equals 30 seconds 4 TIME 60 SEC T3 Timeout equals 60 seconds 1 NETWORK OPT 1 DTE RATE 2 CON...

Page 64: ...for setting CD OPTIONS Table 6 8 CD Options AT Commands Front Panel AT Command Description 1 FORCED ON C0 On all the time 2 NORMAL C1 On only when data present on loop 3 OFF WITH LOCD C2 On except af...

Page 65: ...s AT Commands Front Panel AT Command Description 1 IGNORED D0 Ignore the TR input 2 IDLE WHEN OFF D2 See the following Note 3 OFF ON DIAL 1 D3 Dial Stored 1 TR goes off to on SW56 only 4 OFF ON DIAL 2...

Page 66: ...go On Hook Idle The unit also does not dial out if TR is off In dedicated mode the DSU goes into DTE command mode when TR goes off When TR goes on if the DSU does not receive a command in the number o...

Page 67: ...0 SR Options AT Commands Front Panel AT Command Description 1 FORCED ON S0 Always on 2 OFF OOS ONLY S1 Off when network Out Of Service OOS 3 OFF LOCD ONLY S3 Off 5 seconds after disconnect SW56 only 4...

Page 68: ...Chapter 6 Configuring DTE Options 6 16 DSU III ARdc User Manual 61200270L1 20...

Page 69: ...automatically returning to the data mode Enter the timeout from 0 to 255 seconds The factory default setting is off 0 Figure 7 1 shows the menu path used to access TEST TIMEOUT Figure 7 1 Setting Tes...

Page 70: ...back Table 7 2 shows the equivalent AT commands for setting the RDL option Table 7 1 Test Timeout AT Commands Front Panel AT Command Description ENTER TIMEOUT S18 x Specify 0 255 seconds test timeout...

Page 71: ...setting the EIA LLB op tions EIA Remote Loopback The EIA RLB Electronics Industries Association Remote Loopback op tion specifies whether or not the DSU III ARdc responds to the RLB input from the DTE...

Page 72: ...or setting the EIA RLB op tions Table 7 4 EIA Remote Loopback AT Commands Front Panel AT Command Description 1 DISABLED _R0 EIA RLB disabled 2 ENABLED _R1 EIA RLB enabled 1 NETWORK TYPE 2 DTE OPTIONS...

Page 73: ...to 10 numbers of 36 digits each Edit a phone number by re entering the entire number This process overwrites the pre viously stored number Figure 8 1 shows the menu path used to access the PHONE NUMBE...

Page 74: ...shows the menu path used to enable or disable this option Figure 8 2 Enabling Disabling the Auto Answer Function Table 8 2 shows the AT Commands available for the AUTO ANSWER option Table 8 1 AT Comm...

Page 75: ...AL 3 Select 5 MANUAL COMMAND 4 The first display prompts for command number entry COMMAND 00 5 Use the up arrow key to delete the current entry then use the number keys to enter the new value Press Sh...

Page 76: ...CR Character 3 00 to FF AT LF Character 4 00 to FF AT BS Character 5 00 to FF AT Escape Char Timer 0C 00 to FF Abort Call Timer 7 00 to FF DTR Recognize Delay x 2 5ms 19 00 to FF DTR Initiated Comman...

Page 77: ...ble for use only if AT T MCI SW56 or US SPRINT SW56 is the selected NETWORK TYPE Figure 10 1 shows the menu path used to ac cess these options Figure 10 1 Dial Options Menu Dial Stored This option all...

Page 78: ...formation Enter Dial This option allows you to enter a phone number of up to 36 digits for the DSU III ARdc to dial Redial Last Selecting this option redials the last phone number entered 1 NETWORK OP...

Page 79: ...control the testing from the DTE interface For synchronous operation V 25 bis commands can provide test control The unit also responds to standard DDS network tests initiated from telco test centers...

Page 80: ...nding number followed by Enter 5 The example in Figure 11 2 shows the menu path for initiating a local DTE and loop test Figure 11 2 Initiating a Test Once a test is initiated Please Wait is displayed...

Page 81: ...el to return to the MAIN menu The EXIT TEST DISPLAY STA TUS menu provides the following options which are available only after a test has been initiated Exit Test Exits the current test and returns to...

Page 82: ...3 STRESS PTRN 1 1 EXIT TEST 4 DTE WITH TP 4 STRESS PTRN 2 STATUS DISPLAY 2 DISPLAY STATUS 5 STRESS PTRN 3 6 STRESS PTRN 4 1 2047 PATTERN 2 511 PATTERN 3 STRESS PTRN 1 1 EXIT TEST 5 TEST PATTERN 4 STRE...

Page 83: ...s from the DSU CSU The STATUS menu must be selected in order for the unit to display status messages Pressing Quick returns to the MAIN menu where STATUS can be selected Message Meaning Probable Cause...

Page 84: ...is turned off or disconnected Check remote unit Contact telco service provider CHECK TELCO LINE Transmit receive pair reversal detected Telco wall jack wired incorrectly Switch wire pairs in wall jac...

Page 85: ...cribed in the following section Table 11 2 Troubleshooting New Installs Configuration Item to Check Option Selection Action DTE Type EIA 232 or V 35 From the CONFIG menu select the type of DTE interfa...

Page 86: ...nical Support see the back of this manual If your DSU then is suspected of having problems perform a Self Test to determine whether the unit is in good health is receiving excessive errors requiring r...

Page 87: ...1 3 Test AT Commands Front Panel Display AT Command Description DTE Loop LL T10 TD RD and RX TX Loopbacks Loop Only RT T11 RX TX Loopback at DTE Interface DTE Only T1 TX RX Loopback at Network Interfa...

Page 88: ...Pattern Commands Front Panel AT Command Description 1 2047 PATTERN _T0 T8 Standard 2047 random data pattern 2 511 PATTERN _T1 T8 Standard 511 random data pattern 3 STRESS PTRN 1 _T2 T8 Stress pattern...

Page 89: ...rity of the DTE interface and cable Provide a loopback for network tests Initiating Follow the menu path outlined in Figure 11 6 to initiate a DTE LOOP TEST Figure 11 6 Initiating a DTE Loop Test 1 DT...

Page 90: ...the DTE interface for the local DSU III ARdc to be tested from the remote site over the actual communication circuit Figure 11 7 illustrates the loopback point and the signal paths for this test Figu...

Page 91: ...the DTE interface drivers and receivers of the local DSU III ARdc 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...

Page 92: ...urposes Verify integrity of the DTE interface Verify integrity of connection between DTE and DSU III ARdc Initiating Follow the menu path outlined in Figure 11 10 to initiate a DTE ONLY test Figure 11...

Page 93: ...sed to detect defi ciencies within the internal drivers and receivers of the DSU III ARdc Fig ure 11 11 illustrates the loopback point and the data paths for this test Figure 11 11 DTE with Test Patte...

Page 94: ...1 To verify proper operation of this test single bit errors can be injected into the transmitted test pattern by pressing 2 These errors ap pear on the TEST ERR display Test Pattern The TEST PATTERN...

Page 95: ...ect if there are any errors on the DDS circuit Injects errors and verifies the unit transmits data across the communi cation circuit to the remote unit Helps determine from which direction the circuit...

Page 96: ...the DSU III ARdc It can be performed at any time and is recommended if there is any question about the DSU s health Test Purpose To determine whether the DSU is functioning properly Initiating Follow...

Page 97: ...submenu allows a remotely installed DSU to be placed into loopback There are six test patterns to choose from or Data from the DTE may be selected 1 DTE LOOP LL 2 LOOP ONLY RT 3 DTE ONLY 4 DTE WITH T...

Page 98: ...Figure 11 17 to place a remote DSU III ARdc into loopback Figure 11 17 Initiating a Remote Test 1 2047 PATTERN 1 LOCAL UNIT 2 511 PATTERN 2 TEST ENTER TEST UNIT 3 STRESS PTRN 1 2 REMOTE UNIT ADDRESS...

Page 99: ...mber keys to type the address of the remote DSU then press En ter The test pattern selections are displayed After a test pattern is select ed the system briefly displays Please Wait Test Results If th...

Page 100: ...Chapter 11 Testing and Troubleshooting 11 22 DSU III ARdc User Manual 61200270L1 20...

Page 101: ...r 30 seconds of no front panel operation the DSU III ARdc automati cally reverts to the status display Examples of possible status displays are shown in Figure 12 1 Figure 12 1 Examples of Status Disp...

Page 102: ...twork status is normal UNIT IN TEST The unit is in test Scroll to next status menu for test type DTE COMMAND MODE The unit is in command mode from the DTE AT or V 25 bis In SW56 mode the following mes...

Page 103: ...n NO RX SIGNAL The DSU III ARdc detects sealing current but no receive signal CHECK TELCO LINE The DSU III ARdc detects a possible reversal in the Rx and Tx pairs OOS OOF FROM NET The DSU III ARdc det...

Page 104: ...terminated Network Rate The message displayed on this line of the Status display screen indicates the rate of the service configured for the network DTE Rate Mode The message displayed on this line of...

Page 105: ...ATH Hang Up Call none ATO Go Online none ATQn Result Code Display 0 ATSn Read S Register none ATSn x Write to S Register none ATVn Result Code From 1 ATZ Reset none AT Cn DCD Option 0 AT Dn DTR Option...

Page 106: ...T P x Password Verify 0 AT R Initiate Remote Config AT Tn Anti Stream Option 0 AT_An LLB Control 0 AT_Cn SR Control During Test 0 AT_Dn RTS CTS Delay 0 AT_Fn Scrambler Control 0 AT_Jn Auto Answer Enab...

Page 107: ...ded into the nonvol atile configuration memory See Installation on page 2 1 and Manual Com mand on page 9 1 for more information Profile 1 Profile 1 is configured for a 56 kbps synchronous point to po...

Page 108: ...Echo Enable Enable Enable Enable Result Code Enable Enable Enable Enable Long or Short Code Long Long Long Long Test Pattern Type 2047 2047 2047 2047 CS Delay Short Short Short Short DTR Recog Delay...

Page 109: ...rced On Follow RS Anti stream Timer Timer Off Timer Off Timer Off Timer Off CD Options Normal Normal Forced On Normal TR Options Ignored Ignored Ignored Idle When Off SR Options Off Test OOS Off Test...

Page 110: ...Appendix B Default Configuration Profiles B 4 DSU III ARdc User Manual 61200270L1 20...

Page 111: ...Interconnect MODEM TAIL CIRCUIT APPLICATION A DSU to modem interconnect diagram for a modem tail circuit applica tion is shown in Figure C 1 Figure C 1 DSU to Modem Interconnect M O D E M D S U III RC...

Page 112: ...Appendix C DSU to Modem Interconnect C 2 DSU III ARdc User Manual 61200270L1 20...

Page 113: ...sing the external clock option and this cable should eliminate data errors caused by excessive delays in the DTE transmit clock receiver and transmit data driver When creating this cable at the DTE in...

Page 114: ...Appendix D EIA 232 Connector D 2 DSU III ARdc User Manual 61200270L1 20...

Page 115: ...ed 56 4 wire Data Rates Dedicated mode service rate 2 4 4 8 9 6 19 2 38 4 56 and 64 kbps Switched mode service rate 56 kbps DTE Rates FCC Approval FCC part 15 class A and part 68 DTE Interfaces Both E...

Page 116: ...ate network master internal clock Normal DDS with tail circuit Private network master slaved to external clock Stored number Front panel keypad DTR dialing of stored number In band AT commands V 25 bi...

Page 117: ...48S 4 wire full duplex Receiver Sensitivity 45 dB at all rates Environment Power 24 to 48 VDC 8 W MTBF 334 561 hours Operating Temperature 0 to 50O C 32 to 122O F Storage Temperature 20 to 70O C 4 to...

Page 118: ...Appendix E Specifications Summary E 4 DSU III ARdc User Manual 61200270L1 20...

Page 119: ...patible with the ADTRAN DSU III S4W and with the DSU III TDM 4 wire Switched 56 TDM option asynchronous A method of data transmission which allows characters to be sent at irregular intervals by prece...

Page 120: ...A DCE device used to connect a digital phone line T1 or Switched 56 line coming in from the phone company to either a mul tiplexer channel bank or directly to another device producing a digi tal signa...

Page 121: ...d receive digital data on digi tal transmission facilities digital data service DDS also called Digital Data System A private line digital service for transmitting data end to end at speeds of 2 4 4 8...

Page 122: ...ers terminals and modems Defines the mechanical and electrical characteristics for connecting DTE and DCE data communications devices It defines what the interface does circuit functions and their cor...

Page 123: ...is retained LATA Local Access and Transport Area One of 161 local geographical areas in the US within which a local telephone company may offer telecom munications services local or long distance loca...

Page 124: ...CSU or VT 100 compatible terminal scrambler A device that transposes or inverts signals or otherwise encodes a message at the transmitter to make it unintelligible at a receiver not equipped with an a...

Page 125: ...the functions of estab lishing and releasing connections on a per call basis between two or more circuits services or communications systems The DSU III S2W and DSU III S4W are examples of Switched 56...

Page 126: ...rd for trunk interface between a network access device and a packet network that defines signaling for data rates greater than 19 2 kbps VT 100 A non intelligent terminal or terminal emulation mode us...

Page 127: ...2 check telco line 12 3 clear to send CS 3 6 6 8 AT commands 6 9 clock source 5 5 configuration 2 5 dial backup 8 1 DTE options 6 1 local 4 1 network options 5 1 test options 7 1 configuration CONFIG...

Page 128: ...19 2 and 38 4 kbps 6 3 E EIA local loopback LLB 7 3 AT commands 7 3 EIA remote loopback RLB 7 3 AT commands 7 4 EIA 232 connector D 1 enter 3 3 3 4 exit test 11 3 external clock 6 7 D 1 F function key...

Page 129: ...5 4 5 5 enable disable 5 3 remote loopback 11 1 12 4 request to send 3 6 return material authorization RMA viii S scrambler on off 6 2 AT commands 6 2 factory default 6 2 self test 11 18 shift 3 5 st...

Page 130: ...Index 4 DSU III ARdc User Manual 61202013L1 20 Index V 35 connector 2 3 VALA 2 9 W warranty 1 2...

Page 131: ...repair is needed Technical Support will coordinate with the Customer and Product Service CaPS department to issue an RMA number For information regarding equipment currently in house or possible fees...

Page 132: ...Notes...

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