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Chapter 4. Testing and Troubleshooting

61200063L1-20

DSU III TDM User Manual

4-27

Table 4-3. Messages from the DSU/CSU

Message

Meaning

Probable

Cause

Action

LOOP IS
NORMAL

Good local loop
signal being
received from the
telco.

Good local loop. No action

required; unit
properly
connected to telco
circuit.

OPEN LOOP

Unit not receiving
a signal from the
telco.

Bad telco cable
from the DSU to
telco jack or bad
circuit to telco.

Replace telco
cable from DSU to
wall jack. If a
problem persists,
contact telco
provider.

NO RX SIGNAL

Unit detects
sealing current but
no data signal
from telco.

Bad conductor in
telco cable from
DSU to telco jack
or bad circuit to
telco.

Replace telco
cable from DSU to
wall jack. If a
problem persists,
contact telco
provider.

OOS/
OOF_FROM NET

Unit detects an
Out of Service or
Out of Frame
condition from the
telco.

Telco is having
problems with
DDS circuit or
remote unit 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 jack or
contact telco
service provider.

TEST FROM
TELCO

Telco activated a
loopback to test
the DDS circuit.

Telco is testing
circuit.

Wait until test is
complete or
contact telco
service provider.

Содержание 1200063L1

Страница 1: ...57 6 CVC 5GTXKEG 7PKV 2CTV 0WODGT 3422285 3 QEWOGPV 0WODGT 83422285 3 42 RTKN 3...

Страница 2: ...is a registered trademark of CAE electronics and is used by Northern Telecom under license 901 Explorer Boulevard P O Box 140000 Huntsville AL 35814 4000 256 963 8000 1999 ADTRAN Inc All Rights Reserv...

Страница 3: ...ulty with this equipment please contact ADT RAN for repair and warranty information The telephone company may require this equipment to be disconnected from the network until the problem is corrected...

Страница 4: ...rference 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 compliances with Class A FCC limits CANADIAN EMISS...

Страница 5: ...quipment should be made by an authorized Canadi an maintenance facility designated by the supplier Any repairs or alter ations made by the user to this equipment or equipment malfunctions may give the...

Страница 6: ...y and or batteries indicated in the manual Do not dispose of batteries in a fire They may explode Check local codes for any special disposal instructions SAVE THESE INSTRUCTIONS ADTRAN YEAR 2000 Y2K R...

Страница 7: ...1 4 1B D Basic Rate ISDN Backup Option 1 4 Entering Dial Backup Mode 1 5 Loss of Sealing Current 1 5 Out of Service OOS Signal 1 5 No Receive Signal 1 5 All 1s or all 0s Condition 1 5 Conditions for R...

Страница 8: ...atus 3 6 Current DDS Network Status 3 6 Test 3 7 Configuration CONFIG 3 7 Dial 3 7 Basic Menu Travel 3 8 Front Panel 3 10 LCD Window 3 10 Enter 3 10 Numeric Keypad 3 10 Shift 3 10 Quick 3 11 Cancel 3...

Страница 9: ...17 Interpreting Test Results 4 17 Self Test 4 18 Test Purpose 4 18 Initiating 4 18 Interpreting Test Results 4 18 Remote Unit Diagnostics 4 20 Test Patterns 4 20 Data from DTE 4 21 Port RDL 4 22 Test...

Страница 10: ...al 7 6 Data Set Ready SR Options 7 7 Forced On 7 7 Off OOS Only 7 7 Off Test Only 7 7 Off Test OOS 7 7 Off Remt Idle 7 7 Chapter 8 Configuring Test Options Test Options 8 1 Test Timeout 8 1 Remote Dig...

Страница 11: ...9 7 ISDN Dial Backup Options 9 8 Switch Type 9 8 Chapter 10 Manual Command Manual Command 10 1 Chapter 11 Dial Options Dial Options 11 1 Answer Unit Connected to DDS Line 11 2 Dial Backup 11 2 Origin...

Страница 12: ...xii DSU III TDM User Manual 61200063L1 20 Table of Contents Appendix F Glossary F 1 Index 1...

Страница 13: ...11 Figure 4 10 Initiating a DTE Only Test 4 12 Figure 4 11 DTE with Test Pattern 4 13 Figure 4 12 Initiating a DTE Test with Test Pattern 4 14 Figure 4 13 Test Pattern Only 4 16 Figure 4 14 Initiating...

Страница 14: ...Setting Test Timeout 8 1 Figure 8 2 Remote Digital Loopback 8 2 Figure 8 3 DBU Answer Test 8 3 Figure 9 1 Dial Options 9 2 Figure 9 2 Editing a Stored Phone Number 9 3 Figure 10 1 Manual Command 10 1...

Страница 15: ...ges from the DSU CSU 4 27 Table 10 1 Manual Commands 10 2 Table A 1 Pin Assignments for EIA 232 Connectors A 1 Table A 2 Pin Assignments for Main Connector A 2 Table A 3 Pin Assignments for Backup Con...

Страница 16: ...xvi DSU III TDM User Manual 61200063L1 20 List of Tables...

Страница 17: ...f lower speed channels Figure 1 1 on page 1 2 shows an example of a typical application using the DSU III TDM on a 64 kbps network Each of the four DTE devices is al lowed a portion of the dedicated c...

Страница 18: ...loop service to DDS customers and may provide data for routing Inter LATA to an interexchange carrier In DDS mode the DSU III TDM sup ports the 56 64 kbps DDS service rate DDS NETWORK CENTRAL OFFICE 6...

Страница 19: ...circuit the DSU III TDM can be au tomatically or manually returned to dedicated operation When using analog V 32 bis backup only port 1 is backed up When operating at a DDS loop rate of 64 kbps the T...

Страница 20: ...slower connection rate V 42 bis in creases the effective data throughput from 14 4 kbps to as high as 57 6 kbps depending on the data type No compression is supported in syn chronous operation Due to...

Страница 21: ...hat the loop is open Out of Service OOS Signal An OOS signal generated by the network indicates a device or devices in the network is out of service If the network has an excessive rate of er rors the...

Страница 22: ...circuit failure has been corrected Once the DSU III TDM deter mines that the problem has been properly corrected and the DDS circuit is stable it will wait for the amount of time specified in the rest...

Страница 23: ...ot meet its published specifications or fails while in service For detailed warranty repair and return information re fer to the ADTRAN Equipment Warranty and Repair and Return Policy Procedure Return...

Страница 24: ...Chapter 1 Introduction 1 8 DSU III TDM User Manual 61200063L1 20...

Страница 25: ...of this manual Keep the original shipping container to use for future shipment or verification of damage during shipment ADTRAN Shipments Include The following items are included in ADTRAN shipments o...

Страница 26: ...number 1200063L6 for male to male part number 1200063L8 for male to female is available from ADTRAN This cable converts the EIA 232 on the rear panel of the unit to V 35 The pinout for the V 35 conver...

Страница 27: ...modular jack labeled BACKUP provides con nection to the switched telco circuit The pinout for the BACKUP connector depends on the backup option selected The pinouts for each of the dial backup options...

Страница 28: ...face is provided on four standard DB 25 connectors See Table on page A 1 for the EIA 232 interface pin as signments The V 35 adapter 1200063L6 or 1200063L8 is recommended for data rates above 19 2 kbp...

Страница 29: ...oes not match the desired system requirements modify the default con figuration or select another profile more closely matching the desired con figuration and modify When a new profile is loaded or th...

Страница 30: ...emote Command The DSU III TDM can be controlled remotely from another DSU III TDM The Configuration CONFIG menu allows the DSU III TDM remote config uration capability to be enabled or disabled For mo...

Страница 31: ...fea tures All menu operations are displayed in the LCD window The opening menu is the access point to all other operations There are four main menu branches STATUS TEST CONFIGURATION and DIAL Each ma...

Страница 32: ...ttempting to change to a port not in use Figure 3 1 Status Display Example Network Rate DTE Rate and Data Format The second screen of the Status display indicates the current loop rate either 56K or 6...

Страница 33: ...led No backup service option card installed in the DSU III TDM unit Answering Call The DSU III TDM has detected incoming call messages and is starting the setup call procedure Call Disconnect Call Dis...

Страница 34: ...ther the called terminal or the called terminal s access line is out of service or is faulty 2 wire and 4 wire Switched 56 Open Loop The physical connection to the backup line has been broken 2 wire a...

Страница 35: ...e synchronization and is ready to pass data Out of Sync The multiplexer has not been able to achieve frame synchronization and cannot pass data Possible reasons for no synchronization are Unit not con...

Страница 36: ...rently in test mode Use the arrow keys to display the type of test being performed Answering Call The DSU III TDM detects an incoming call Check Telco The transmit and receive Tx Rx pairs of the loop...

Страница 37: ...MBLE option submenu is dis played instead of the DTE RATE menu to control scrambling The CONFIG menu branch is divided into several chapters for easier reference The di vision includes a brief overvie...

Страница 38: ...nds The following example steps and Figure 3 2 on page 3 9 illustrate how to select DSU III TDM options 1 Select Configuration CONFIG by pressing 3 and then pressing Enter 2 Select LOCAL or REMOTE CON...

Страница 39: ...00063L1 20 DSU III TDM User Manual 3 9 Figure 3 2 Example of Basic Menu Travel 1 LOCAL 1 NETWORK OPT 1 LOOP RATE 3 CONFIG 2 DTE OPTIONS 2 CLOCK SOURCE 2 REMOTE 3 TEST OPTIONS 3 REMOTE CONFIG 4 DIAL OP...

Страница 40: ...ND AC CEPTED indicates a valid operation Numeric Keypad The numeric keypad contains the numbers 0 through 9 and alpha characters A through F which are used to activate menu items Numbers 0 through 9 a...

Страница 41: ...he previous menu Repeat until the desired menu level is reached Up and Down Arrows Up and Down Arrows scroll through the submenu items available in the current menu Submenu items display two at a time...

Страница 42: ...e multiplexer transmits data to the DTE on the currently active port RD Receive Data This LED is active when data is received from the DTE on the currently active port CD Carrier Detect This LED is ac...

Страница 43: ...cribed in the appendix Pinouts on page A 1 The DSU III TDM rear panel is shown in Figure 3 4 Figure 3 4 DSU III TDM Rear View Item Function Port 1 Port 4 DTE connection Power switch Used to turn power...

Страница 44: ...Chapter 3 Operation 3 14 DSU III TDM User Manual 61200063L1 20...

Страница 45: ...unctions that isolate portions of the circuit to identify the problem source Tests may be initiat ed and terminated from the front panel or the DTE interface The unit also responds to standard DDS net...

Страница 46: ...Before Initiating Loopback Test All diagnostic tests disrupt data flow LOCAL TDM DTE Rx Tx Rx Tx Rx Tx Rx Tx DTE Rx Tx Rx Tx DTE Rx Tx Rx Tx DTE Rx Tx Rx Tx Rx Tx Rx Tx Rx Tx Rx Tx REMOTE TDM DTE R x...

Страница 47: ...by Enter 3 Use the Up and Down arrows to view test options 4 Select a test from the available options by pressing the corresponding number followed by Enter The example in Figure 4 2 shows the menu p...

Страница 48: ...test pattern Figure 4 3 Sample Test Status Displays Exiting a Test During a test press Quick to access the EXIT TEST DISPLAY STATUS menu or press Cancel to return to the main menu The EXIT TEST DISPL...

Страница 49: ...P A TTE R N 2 5 1 1 P A TTE R N 3 S TR E S S P TR N 1 5 TE S T P A TTE R N 4 S TR E S S P TR N 2 2 TE S T 5 S TR E S S P TR N 3 6 S TR E S S P TR N 4 S E LF TE S T 6 S E LF TE S T C H EC K S U M X X X...

Страница 50: ...Description DTE Loop LL TD RD and RX TX Loopbacks Loop Only RT RT TX Loopback at Network Interface DTE Only TX RX Loopback at DTE Interface DTE with TP RX RX Loopback with test pattern Test Pattern Tr...

Страница 51: ...e sections and then loops the receive data of each interface back to its respective transmit data The DTE LOOP test provides a bidi rectional loopback at the DSU CSU Figure 4 5 illustrates the loopbac...

Страница 52: ...Provide a loopback for network tests Initiating Follow the menu path outlined in Figure 4 6 to initiate a DTE LOOP test Figure 4 6 Initiating a DTE Loop Test Interpreting Test Results A BERT tester m...

Страница 53: ...on of the DTE interface for the local DSU III TDM to be tested from the remote site over the actual communication circuit Figure 4 7 illustrates the loop back point and the signal paths for this test...

Страница 54: ...P ONLY test Figure 4 8 Initiating a Loop Only Test Interpreting Test Results The Loop Only test is used for the purpose of looping the DDS circuit back to the telco No test results are available from...

Страница 55: ...DTE transmit data is connected to the DTE receive data at a point close to the physical DTE interface This test can be used to verify proper operation between the local DTE and the local DSU III TDM...

Страница 56: ...y of connection between DTE and DSU III TDM Initiating Follow the menu path outlined in Figure 4 10 to initiate a DTE ONLY test Figure 4 10 Initiating a DTE Only Test Interpreting Test Results A BERT...

Страница 57: ...nerated using the DSU CSU internal test pattern generator This test can be used to detect deficiencies within the network interface Figure 4 11 illustrates the loop back point and the data paths for t...

Страница 58: ...ress pattern with alternating high and low ones densities Repeated pattern of 100 octets 1111 1111 followed by 100 octets 0000 0000 Stress Pattern 2 Stress pattern with alternating medium and low ones...

Страница 59: ...being performed while the second line of the display indicates the number of errors accu mulated by the test pattern detector If errors occur during this test the test error count can be reset to zer...

Страница 60: ...n this test is used the remote DSU CSU must be in loopback or transmitting a test pattern Figure 4 13 illus trates the data paths for this mode Figure 4 13 Test Pattern Only TELCO Test Pattern Generat...

Страница 61: ...s data across the communi cation circuit to the remote unit Helps determine from which direction the circuit is receiving errors Initiating Follow the menu path outlined in Figure 4 14 to initiate a t...

Страница 62: ...nctioning properly Initiating Follow the menu path outlined in Figure 4 15 to initiate a SELF TEST Figure 4 15 Initiating a Self Test Interpreting Test Results Once SELF TEST is activated the LEDs cyc...

Страница 63: ...INVALID MUX CONFIG BLOCK message is an indication that the multi plexer received invalid configuration information from the nonvolatile memory This condition may be cleared by performing a factory def...

Страница 64: ...e 4 16 on page 4 21 The remote unit is placed in RDL automatically The DSU III TDM is capable of transmitting six test patterns with its built in test pattern generator For more information on the tes...

Страница 65: ...n be transmitted and ver ified on any or all of the DTE ports depending on the physical connection See Figure 4 16 Figure 4 16 V 54 Remote Digital Loopback w Test Pattern Test Pattern Generator Error...

Страница 66: ...through the network to the remote end where it is looped back and transmit ted to the local end This allows the whole network to be tested on a port by port basis The other three ports function norma...

Страница 67: ...ress 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 the test is successful the...

Страница 68: ...ginate unit to the answer unit Receive data is checked for errors and the results dis played on the front panel While running this test errors may be injected by pressing 2 and cleared by pressing 1 D...

Страница 69: ...tiating Follow the menu path outlined in Figure 4 19 to initiate a DBU Connection test Figure 4 20 Initiating a DBU Connection Test Interpreting Test Results If the unit is functioning properly the DS...

Страница 70: ...otely attached ADTRAN DSU CSUs Messages from the DSU CSU The DSU III TDM displays messages on the LCD display and LEDs concerning the status of the unit and the local loop If the Alarm LED is on one o...

Страница 71: ...g current but no data signal from telco Bad conductor in telco cable from DSU to telco jack or bad circuit to telco Replace telco cable from DSU to wall jack If a problem persists contact telco provid...

Страница 72: ...Chapter 4 Testing and Troubleshooting 4 28 DSU III TDM User Manual 61200063L1 20...

Страница 73: ...p The DSU III TDM contains four different user profiles sets of configura tions options that are stored in read only memory see Default Configura tion for the DSU III TDM on page B 2 The unit is shipp...

Страница 74: ...Options on page 6 1 Configuring DTE Options on page 7 1 Configur ing Test Options on page 8 1 Configuring Dial Options on page 9 1 and Man ual Command on page 10 1 A complete CONFIGURATION menu is sh...

Страница 75: ...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 The DSU III TDM supports loop rates of 56 and 64 kbps shown in Figu...

Страница 76: ...20 For 64 kbps clear channel operation the DTE data sequences might mimic network loop maintenance functions and erroneously cause other network elements to activate loopbacks To prevent this the SCRA...

Страница 77: ...timing source Selecting the MASTER option sets the DSU III TDM as the master timing source Figure 6 2 Setting the Clock Source When operating on a DDS network the timing should be FROM NETWORK On a p...

Страница 78: ...ct remote configura tion commands Figure 6 3 shows the menu path for enabling dis abling remote configuration The factory default setting is ENABLED Figure 6 3 Enabling Disabling Remote Configuration...

Страница 79: ...otal for all four ports cannot exceed the maximum bandwidth The maximum band width for a loop rate of 56 kbps is 52 8 kbps and 60 8 kbps for a loop rate of 64 kbps If the maximum bandwidth is exceeded...

Страница 80: ...Options Changing the DTE RATE on any port momentarily interrupts the flow of data on all four ports If a 64 kbps main DDS line is switched to a 56 kbps backup line the DSU III TDM drops DTEs starting...

Страница 81: ...ce The factory default setting is SYNCHRONOUS see Figure 7 2 In DTE PASS THROUGH mode selecting ASYNCHRONOUS operation sets the rate to 57 6 kbps for port 1 Figure 7 2 Selecting Data Format 1 NETWORK...

Страница 82: ...y used in modem tail circuit appli cations A DSU to modem interconnect diagram for this application is shown in the appendix DSU to Modem Interconnect on page C 1 The EXTERNAL clock option is also rec...

Страница 83: ...nd RS is ignored as long as the unit is synchronized and able to pass data Follows RS The CS state matches the RS state No data can be received from the DTE device until RS is activated The CS lead on...

Страница 84: ...Normal The CD lead is active only when frame synchronization has been achieved and data is received from the far end If a configuration problem has been detected such as a port not configured the sam...

Страница 85: ...more information on OOS see the section When Out of Service OOS on page 9 4 Off Test Only The SR lead is on except when the DSU III TDM is executing a test Off Test OOS The SR lead is on except during...

Страница 86: ...Chapter 7 Configuring DTE Options 7 8 DSU III TDM User Manual 61200063L1 20...

Страница 87: ...in a test mode before automatically returning to the data mode Enter the time out in two digit decimal value The range is 0 to 99 seconds The fac tory default setting is 0 which disables the timer so...

Страница 88: ...te digital loopback RDL request from the far end of the circuit The factory default setting is RDL ACCEPTED Figure 8 2 shows the menu path used to access the RDL EN DIS option Figure 8 2 Remote Digita...

Страница 89: ...er for this test to be performed DBU ANSWER TEST must be enabled on the remote see Figure 8 3 If DBU ANSWER TEST is not enabled the remote unit will not accept a DBU test from the other end Figure 8 3...

Страница 90: ...Chapter 8 Configuring Test Options 8 4 DSU III TDM User Manual 61200063L1 20...

Страница 91: ...tions DIAL OPTIONS The DIAL OPTIONS menu stores up to ten phone numbers and defines the dial backup operation of the DSU III TDM when the DDS circuit fails Figure 9 1 shows the full DIAL OPTIONS menu...

Страница 92: ...O RX SGNL 1 DISABLED 2 ENABLED 6 NO SEAL CUR 1 DISABLED 2 ENABLED 7 WHEN ALL 1s 0s 1 DISABLED 2 ENABLED 8 AUTO RESTORE RESTORE TIMER 0 OFF 1 MIN 9 REDIAL COUNTER ENTER REDIAL COUNT 5 A FAIL TIMER AUTO...

Страница 93: ...64 kbps instead of 56 kbps For example 2059718000 4 Setting the Service Profile Identifier SPID For ISDN dial backup the service profile identifier SPID must be entered in Stored Number 9 The SPID is...

Страница 94: ...bled dial backup mode must be entered manually The factory de fault setting is DISABLE Number to Dial The NUMBER TO DIAL option offers a selection of stored numbers for the unit to automatically dial...

Страница 95: ...n backup until the DDS circuit is active for the length of time specified for the RESTORE TIMER The selection is entered in minutes up to 255 If set to 0 the DDS must be restored manually The factory...

Страница 96: ...ions include AT T MCI Other and US Sprint V 32 bis Dial Backup Options Error Control This option determines the type of error control to be negotiated at the start of a V 32 bis modem connection The f...

Страница 97: ...ay be achieved For synchronous ap plications the speed is limited to a maximum of 14 4 kbps The factory default setting is ENABLED Rel V 42 MNP Reliable V 42 LAPM or MNP operation Uses either V 42 LAP...

Страница 98: ...U III TDM User Manual 61200063L1 20 ISDN Dial Backup Options Switch Type This option selects the type of telco central office switch providing the ISDN service There are three options for ISDN switch...

Страница 99: ...n Table 10 1 on page 10 2 Figure 10 1 shows the menu path for manual command Figure 10 1 Manual Command When MANUAL COMMAND is selected the following prompt is displayed After the command is entered t...

Страница 100: ...et 3 8A 02 Option Set 4 8A 03 Store User Profile Save to Profile 0 91 00 Save to Profile 1 91 01 Select User Profile Power Up Profile 0 93 00 Power Up Profile 1 93 01 Front Panel Disable AA 00 Enable...

Страница 101: ...nd designated as the ANSWER or ORIGINATE unit or is currently in dial backup mode see Figure 11 1 Figure 11 1 Dial Options Menu Answer Unit Connected to DDS Line 1 DIAL BACKUP COMMAND ACCEPTED Origina...

Страница 102: ...rs can be used or a new number can be entered Stay on Leased The DSU III TDM remains on the leased line and does not enter dial back up mode DBU Online Test This option allows the dial backup connecti...

Страница 103: ...s Rear Panel on page 3 13 and DTE Connection on page 2 4 Table A 1 Pin Assignments for EIA 232 Connectors Pin EIA Description 1 AA Protective Ground PG 2 BA Transmit Data SD 3 BB Receive Data RD 4 CA...

Страница 104: ...nector Pin Name Description 1 R1 Transmit Data from DSU to Network Ring 1 2 T1 Transmit Data from DSU to Network Tip 1 3 6 Not Used 7 T Receive Data from Network to DSU Tip 8 R Receive Data from Netwo...

Страница 105: ...mber 1200063L6 is a 6 foot cable Electrical Interface Mechanical Interface Power Requirements Power is supplied on pins nine and ten of the DB 25 DCE connector as fol lows DTE Standard V 35 signal int...

Страница 106: ...rminal Ready DTE J Not Used K Not Used L Not Used M Not Used N Not Used P Transmit Data A DTE R Receive Data A DCE S Transmit Data B DTE T Receive Data B DCE U External Transmit Clock A DTE V Receive...

Страница 107: ...DCE 4 Request to Send DTE 5 Clear to Send DCE 6 Data Set Ready DCE 7 Signal Ground 8 Carrier Detect DCE 9 12V 50mA Max DCE 10 12V 50mA Max DCE 11 Not Used 12 Not Used 13 ETC Select DCE 14 Not Used 15...

Страница 108: ...Appendix A Pinouts A 6 DSU III TDM User Manual 61200063L1 20...

Страница 109: ...le 1 Profile 1 is configured for a 56 kbps loop rate with port speeds set at 9 6 kbps synchronous point to point operation Automatic DBU has been disabled for this configuration profile Profile 2 Use...

Страница 110: ...ps Scrambler Mode OFF OFF OFF OFF Remote Conf En Dis Enable Enable Enable Enable Clock Source From Network From Network DTE Options DTE Rate 56k loop 9 6 kbps 9 6 kbps 9 6 kbps 9 6 kbps DTE Data Forma...

Страница 111: ...re Timer 1 minute 1 minute 1 minute 1 minute DBU Redial Counter 5 5 5 5 DBU Fail Timer x10 3 seconds 3 seconds 3 seconds 3 seconds DBU Redial Wait Time 10 10 10 10 When all 1s 0s Disable Disable Disab...

Страница 112: ...Appendix B Configuration Profiles B 4 DSU III TDM User Manual 61200063L1 20...

Страница 113: ...nect MODEM TAIL CIRCUIT APPLICATION A DSU III TDM to modem interconnect diagram for a modem tail circuit application is shown in Figure C 1 Figure C 1 DSU III TDM to Modem Interconnect M O D E M D S U...

Страница 114: ...Appendix C DSU to Modem Interconnect C 2 DSU III TDM User Manual 61200063L1 20...

Страница 115: ...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...

Страница 116: ...Appendix D EIA 232 Connector D 2 DSU III TDM User Manual 61200063L1 20...

Страница 117: ...eatures incorporat ed in the DSU III TDM Network Interface Line rate i Physical interface DTE Interface Switched Mode Dialing 56k 64 kbps RJ48S 4 wire Four EIA 232 DTE connectors V 35 adapters availab...

Страница 118: ...al 4 wire switched 56 2 wire switched 56 1 B D ISDN V 32 bis Network CSU DSU loopbacks User Local DTE and loop V 54 Test Patterns 2047 511 DDS stress patterns 1 through 4 Normal DDS or private network...

Страница 119: ...E Specifications Summary 61200063L1 20 DSU III TDM User Manual E 3 Environment Operating Temperature 0 to 50 C 32 to 122 F Storage Temperature 20 to 70 C 4 to 158 F Relative Humidity Up to 95 non con...

Страница 120: ...Appendix E Specifications Summary E 4 DSU III TDM User Manual 61200063L1 20...

Страница 121: ...56 An AT T proprietary 56 64 kbps switched digital data service offered by telco service providers and delivered to users over 4 copper wires Compati ble with the ADTRAN DSU III S4W and with the DSU...

Страница 122: ...e conditioning and equalization functions and responds to loopback com mands sent from the central office A CSU regenerates digital signals It monitors them for problems and provides a way of testing...

Страница 123: ...that fewer data bits are required to represent a given amount of data Compression facilitates the transmission of more data for a given amount of transmission time and circuit capacity It also reduces...

Страница 124: ...to test DDS circuits Each pattern is designed to stress the DDS circuit in a particular manner to assure its reli ability DSU See data service unit DSU loopback A telco initiated test which loops the...

Страница 125: ...arrangements and defines a limited set of standard multipurpose interfaces for equipment vendors network providers and cus tomers Interworking with a public switched telephone network is retained loc...

Страница 126: ...so is called public network public switched network or public telephone network point to point A private circuit conversation or teleconference in which there is one per son at each end usually connec...

Страница 127: ...lecommunications to customers by a common carrier administration or private operating agency using voice data and or video technologies SMART 16 An ADTRAN rackmount system that allows up to 16 devices...

Страница 128: ...N 160 kbps digital signal between the ISDN central office and the NT1 at the customer premises UL Underwriters Laboratories A laboratory established by the National Board of Fire Underwriters that tes...

Страница 129: ...pendix F Glossary 61200063L1 20 DSU III TDM User Manual F 9 VT 100 A non intelligent terminal or terminal emulation mode used for asynchro nous communications Used to configure the ADTRAN Smart 16 She...

Страница 130: ...Appendix F Glossary F 10 DSU III TDM User Manual 61200063L1 20...

Страница 131: ...backup connector A 2 pin assignments A 2 backup options E 2 C Call Disconnect 3 3 called unit busy 3 3 cancel 3 8 cancel key 3 11 carriage return character 10 2 carrier detect CD 3 12 7 6 CD 3 12 Che...

Страница 132: ...ameters 5 1 DTE off sync 3 2 DTE only 4 11 DTE options 5 1 DTE pass through 7 2 DTE rate 7 1 factory default 7 1 DTE rates 7 2 DTE with test pattern 4 13 DTR initiated command timeout 10 2 DTR recogni...

Страница 133: ...haracter 10 2 front panel enable disable 10 2 line feed character 10 2 load factory option 10 2 network address lock 10 2 network address unlock 10 2 select user profile 10 2 store user profile 10 2 m...

Страница 134: ...thorization RMA 1 7 RS 3 12 S select user profile 10 2 self test 4 18 shift key 3 10 status dial backup mode 3 3 Status menu 3 2 status messages Answering Call 3 6 answering call 3 3 Call Disconnect 3...

Страница 135: ...5 1 configuration 8 1 test pattern 4 16 test status display 4 4 test timeout 8 1 testing 4 1 transmit clock 7 4 D 1 transmit data TD 3 12 TST 3 12 U unit dialing options 5 1 Unit in Test 3 6 unit tes...

Страница 136: ...Index 6 DSU III TDM User Manual 61200063L1 20 Index...

Страница 137: ...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...

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