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DSU III ARdc

Data Service Unit

USER MANUAL

61200270L1-1A
September 1998

Содержание DSU III ARdc

Страница 1: ...DSU III ARdc Data Service Unit USER MANUAL 61200270L1 1A September 1998...

Страница 2: ...mark Hayes is a registered trademark of Hayes Microcomputer Products Inc 901 Explorer Boulevard P O Box 140000 Huntsville AL 35814 4000 Phone 256 963 8000 1998 ADTRAN Inc All rights reserved Printed i...

Страница 3: ...ficulty with this equipment please contact ADTRAN for repair and warranty information The telephone company may re quire this equipment to be disconnected from the network until the prob lem is correc...

Страница 4: ...h 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 Changes or modifications to th...

Страница 5: ...quipment 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...

Страница 6: ...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...

Страница 7: ...nection 2 2 DTE Data Connection Primary DTE 2 2 Configuration 2 4 Configuration Methods 2 5 AT Commands 2 5 V 25 bis Commands 2 6 SDLC Option 2 6 Character Format 2 6 Command Structure 2 7 Bi Sync Opt...

Страница 8: ...ation CONFIG 3 2 Dial 3 2 Basic Menu Travel 3 3 Front Panel 3 4 LCD Window 3 4 Enter 3 4 Up and Down Arrows 3 5 Cancel 3 5 Numeric Keypad 3 5 Shift 3 5 Quick 3 5 LED Description 3 6 Rear Panel 3 6 Cha...

Страница 9: ...7 3 Chapter 8 Configuring Dial Options 8 1 Dial Options 8 1 Phone Number 8 1 Auto Answer 8 2 Chapter 9 Manual Command 9 1 Manual Command 9 1 Chapter 10 Dial Selection 10 1 Dial Options 10 1 Dial Stor...

Страница 10: ...t Pattern 11 15 Test Purpose 11 15 Initiating 11 15 Interpreting Test Results 11 16 Test Pattern 11 16 Test Purpose 11 17 Initiating 11 17 Interpreting Test Results 11 18 Self Test 11 18 Test Purpose...

Страница 11: ...NO FRAME SYNC 12 3 TEST FROM TELCO 12 3 RATE ADAPTING 12 3 ANSWERING CALL 12 3 NO WINK FROM CO 12 3 CALL DISCONNECT 12 4 Network Rate 12 4 DTE Rate Mode 12 4 DTE Control Leads and Status 12 4 Appendi...

Страница 12: ...Table of Contents vi DSU III ARdc User Manual 61200270L1 1...

Страница 13: ...3 Figure 6 3 Selecting the Connector Type 6 4 Figure 6 4 Selecting Data Format 6 5 Figure 6 5 Selecting DTE Command Option 6 6 Figure 6 6 Transmit Clock Options 6 7 Figure 6 7 Selecting CS Options 6 8...

Страница 14: ...ly 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 1...

Страница 15: ...le 6 5 CS Options AT Commands 6 9 Table 6 6 Short and Long Delays at Different Operating Speeds 6 10 Table 6 7 Anti Stream AT Commands 6 11 Table 6 8 CD Options AT Commands 6 12 Table 6 9 TR Options A...

Страница 16: ...List of Tables x DSU III ARdc User Manual 61200270L1 1...

Страница 17: ...to 64 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...

Страница 18: ...t the service rates of 56 kbps and 64 kbps the 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 connec...

Страница 19: ...meet its published specifications or fails while in service For detailed warranty repair and return information refer to the ADTRAN Equipment Warranty and Repair and Return Policy Procedure Return Mat...

Страница 20: ...Chapter 1 Introduction 1 4 DSU III ARdc User Manual 61200270L1 1...

Страница 21: ...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...

Страница 22: ...WORK INTERFACE CONNECTION The DSU III ARdc s eight position modular jack labeled TELCO con nects to the network when the unit is configured for either dedicated or switched operation See Table 2 1 for...

Страница 23: ...t possible radio frequency interference emissions a shielded cable is required Table 2 2 Pin Assignments for Primary EIA 232 Connector Pin EIA Description 1 AA Protective Ground PG 2 BA Transmit Data...

Страница 24: ...on is required to put the unit into service If profile 1 does not match the desired system Pin CCITT Description A 101 Protective Ground PG B 102 Signal Ground SG C 105 Request to Send RS D 106 Clear...

Страница 25: ...Table 2 4 Configuration Methods AT Commands The DSU III ARdc can be configured and controlled with in band AT commands from an asynchronous DTE port just as modems are To exit the data mode and enter...

Страница 26: ...mand line is executed by the DSU III ARdc upon receipt of a terminating character The default terminating character is a carriage return ASCII 013 but it can be changed by writing a different value to...

Страница 27: ...w 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 Option Charact...

Страница 28: ...FIET Call failed on switched network busy detected CFIDE Call failed on switched network no wink detected CFINS Call failed no dial string in specified register INVCU Unknown command detected INVPS In...

Страница 29: ...d 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 returned...

Страница 30: ...cified 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 INVPS Invalid Parameter Syntax resp...

Страница 31: ...e 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 reg...

Страница 32: ...Chapter 2 Installation 2 12 DSU III ARdc User Manual 61200270L1 1...

Страница 33: ...of the Main Menu 1 STATUS 2 TEST 3 CONFIG 4 DIAL The DIAL option is only available when the unit is configured for a Switched 56 network type For more information see Chapter 10 Dial Selection Main Me...

Страница 34: ...to enter a manual command This menu branch is divided into several chapters for easier reference The division includes a brief overview chapter followed by a separate chapter for each of the five sub...

Страница 35: ...ample and Figure 3 1 illustrate how to select the DSU III ARdc Loop Rate option 1 Select Configuration CONFIG by pressing 3 then press Enter 2 Select LOCAL or REMOTE test by pressing the corresponding...

Страница 36: ...ation 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 Wh...

Страница 37: ...The 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 rel...

Страница 38: ...Data CD Carrier Detect ALM Alarm Indication TST Test Mode Manual REAR PANEL The rear panel contains two DTE connectors which provide a V 35 or EIA 232 connection An 8 pin telco jack a DC power connec...

Страница 39: ...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...

Страница 40: ...Chapter 3 Operation 3 8 DSU III ARdc User Manual 61200270L1 1...

Страница 41: ...efault Configuration Profiles on page B 1 The unit is shipped from the factory with profile number 1 default configuration loaded into the cur rent nonvolatile configuration memory If profile 1 matche...

Страница 42: ...1 For detailed information on configuration see Chapter 5 Configuring Net work Options Chapter 6 Configuring DTE Options Chapter 7 Configur ing Test Options Chapter 8 Configuring Dial Options and Chap...

Страница 43: ...r is set 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 s...

Страница 44: ...and format selections are listed in Figure 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...

Страница 45: ...ress Table 5 2 shows the AT command used to set the network address Table 5 2 Network Address Command Remote Configuration This option sets up the DSU III ARdc to accept or reject remote configura tio...

Страница 46: ...ype This option configures the DSU III ARdc for the specific type of network being used The factory default setting is DEDICATED see Fig ure 5 4 Front Panel AT Command Description 1 DISABLE P4 Disable...

Страница 47: ...The CLOCK SOURCE options specify the timing source for the DSU III ARdc s internal circuitry The factory default setting is FROM NET WORK see Figure 5 5 Front Panel AT Command Description 1 DEDICATED...

Страница 48: ...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...

Страница 49: ...o 1 2K see Figure 6 2 The factory default set ting 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 show...

Страница 50: ...r network elements to activate loopbacks To prevent this the SCRAM BLER ON or SUPPRESS LBE option should be selected for both the local and remote DSU III ARdc For loop rates of 2 4 9 6 19 2 and 38 4...

Страница 51: ...band command modes such as AT commands or V 25 bis If any command modes are set they will be disabled when the 1 2K setting is selected 1 NETWORK OPT 1 DTE RATE 1 SAME AS LOOP 2 1 2K 2 CONNECTOR TYPE...

Страница 52: ...ed 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 232...

Страница 53: ...nds 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...

Страница 54: ...tion 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 B...

Страница 55: ...dem tail circuit applications A DSU to modem interconnect diagram for this application is shown in Appendix C DSU to Modem Interconnect on page C 1 The EXTERNAL clock option is also recommended when t...

Страница 56: ...ss the CS OPTIONS menu The default factory setting is FOLLOWS RS with CS DELAY SHORT Figure 6 7 Selecting CS Options If one of the options chosen involves request to send RS then the delay from RS to...

Страница 57: ...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 continue t...

Страница 58: ...DTE device on a multi drop network from continuously tying 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 eve...

Страница 59: ...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 CONN...

Страница 60: ...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...

Страница 61: ...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...

Страница 62: ...e SR Options The SR OPTIONS menu is used to select the operating mode for the data set ready SR lead Press Shift A to activate the SR OPTIONS sub menu The factory default setting is OFF TEST ONLY show...

Страница 63: ...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 dis connect SW56 only 4...

Страница 64: ...Chapter 6 Configuring DTE Options 6 16 DSU III ARdc User Manual 61200270L1 1...

Страница 65: ...fore 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...

Страница 66: ...s for setting the RDL option Table 7 2 Remote Digital Loopback AT Commands EIA Local Loopback The EIA LLB Electronics Industries Association Local Loopback option specifies whether or not the DSU III...

Страница 67: ...emote Loopback The EIA RLB Electronics Industries Association Remote Loopback option specifies whether or not the DSU III ARdc responds to the RLB input from the DTE The factory default setting is DIS...

Страница 68: ...or setting the EIA RLB options 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 1...

Страница 69: ...s up to ten numbers of 36 digits each Edit a phone number by re entering the entire number This process overwrites the previously stored number Figure 8 1 shows the menu path used to access the PHONE...

Страница 70: ...he DTE or by raising TR from the DTE Figure 8 2 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 availab...

Страница 71: ...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 num ber keys to enter the new value Press Shift to activa...

Страница 72: ...e Character 2 00 to FF AT 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 t...

Страница 73: ...Chapter 9 Manual Command 61200270L1 1 DSU III ARdc User Manual 9 3 Network Addr Unlock C3 00 Network Addr Lock C3 01 Table 9 1 Manual Commands Continued Command Description Command Value...

Страница 74: ...Chapter 9 Manual Command 9 4 DSU III ARdc User Manual 61200270L1 1...

Страница 75: ...available 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 access these options Figure 10 1 Dial Options Menu Dial Stored This optio...

Страница 76: ...re information 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 NETWO...

Страница 77: ...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...

Страница 78: ...er 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 briefly f...

Страница 79: ...ancel to return to the Main menu The Exit Test Display Status menu provides the following options which are available only after a test has been initiated Exit Test Exits the current test and returns...

Страница 80: ...1 EXIT TEST 3 STRESS PTRN 1 STATUS DISPLAY 2 DISPLAY STATUS 4 DTE WITH TP 4 STRESS PTRN 2 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...

Страница 81: ...STATUS can be selected Table 11 1 Messages from the DSU CSU Message Meaning Probable Cause Action LOOP IS NORMAL Good local loop sig nal being received from the telco Indicates good local loop No act...

Страница 82: ...pair reversal detected Telco wall jack wired incorrectly Switch wire pairs in wall jack or contact telco service pro vider TEST FROM TELCO Telco activated a loopback to test the DDS circuit Telco is t...

Страница 83: ...A MODE LOOP IS NORMAL is shown begin performing diagnostics described in the following section Configuration Item to Check Option Selection Action DTE Type EIA 232 or V 35 From the CONFIG menu select...

Страница 84: ...al Support see inside back cover of this manual If your DSU then is suspected of having problems perform a Self Test to determine the unit is in good health is receiving excessive errors requiring ret...

Страница 85: ...Pattern tests 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 Interface DTE...

Страница 86: ...his test 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 with alt...

Страница 87: ...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 LOCA...

Страница 88: ...ion of 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 tes...

Страница 89: ...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...

Страница 90: ...oses 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 10...

Страница 91: ...n be used to detect defi ciencies within the internal drivers and receivers of the DSU III ARdc Figure 11 11 illustrates the loopback point and the data paths for this test Figure 11 11 DTE with Test...

Страница 92: ...n be reset to zero by pressing 1 To verify proper operation of this test single bit errors can be injected into the transmitted test pattern by pressing 2 These errors appear on the TEST ERR display T...

Страница 93: ...o detect if there are any errors on the DDS circuit Injects errors and verifies the unit transmits data across the commu nication circuit to the remote unit Helps determine from which direction the ci...

Страница 94: ...ation of the DSU III ARdc It can be per formed at any time and is recommended if there is any question about the DSU s health Test Purpose To determine if the DSU is functioning properly Initiating Fo...

Страница 95: ...te Tests and AT Commands The Remote Unit 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 Front Panel...

Страница 96: ...Figure 11 17 to place a remote DSU III ARdc into loopback Figure 11 17 Initiating a Remote Test DTE LOCAL DSU CSU REMOTE DSU CSU Rx Tx Rx Tx Local Unit Initiates Test Rx Tx TELCO Test Pattern Generato...

Страница 97: ...UNIT Address XX Use the number keys to type the address of the remote DSU then press Enter The test pattern selections are displayed After a test pattern is selected the system briefly displays Pleas...

Страница 98: ...Chapter 11 Testing and Troubleshooting 11 22 DSU III ARdc User Manual 61200270L1 1...

Страница 99: ...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...

Страница 100: ...ODE The unit is in command mode from the DTE AT or V 25 bis In SW56 mode the following messages are possible IDLE The unit is idle waiting for a call or a dial command INCOMING CALL The unit has detec...

Страница 101: ...rmal condition code from the network NO FRAME SYNC The DSU III ARdc cannot sync on the signal from the telco 64k mode only TEST FROM TELCO The DSU III ARdc is in a test initiated from the telco Scroll...

Страница 102: ...te of the service configured for the network DTE Rate Mode The message displayed on this line of the Status display screen indicates the DTE data rate and format DTE Control Leads and Status Four addi...

Страница 103: ...cho Command 1 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...

Страница 104: ...d 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 Enable Disable 0...

Страница 105: ...into the nonvolatile con figuration memory See Chapter 2 Installation and Chapter 9 Manual Command for more information Profile 1 Profile 1 is configured for a 56 kbps synchronous point to point or di...

Страница 106: ...e Long Long Long Long Test Pattern Type 2047 2047 2047 2047 CS Delay Short Short Short Short DTR Recog Delay x2 5ms 3 3 3 3 DTR Command Timeout x1 sec 8 8 8 8 Front Panel En Dis Enable Enable Enable E...

Страница 107: ...mal Normal Forced On Normal TR Options Ignored Ignored Ignored Idle When Off SR Options Off Test OOS Off Test OOS Off Test OOS Off Test OOS Test Options Test Timeout Off Off Off Off RDL En Dis RDL Acc...

Страница 108: ...Appendix B Default Configuration Profiles B 4 DSU III ARdc User Manual 61200270L1 1...

Страница 109: ...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...

Страница 110: ...Appendix C DSU to Modem Interconnect C 2 DSU III ARdc User Manual 61200270L1 1...

Страница 111: ...ing the external clock option and this cable should eliminate data errors caused by excessive delays in the DTE trans mit clock receiver and transmit data driver When creating this cable at the DTE in...

Страница 112: ...Appendix D EIA 232 Connector D 2 DSU III ARdc User Manual 61200270L1 1...

Страница 113: ...ates 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 DTE rates match service rates DTE to loop rate matching in both dedicated and switche...

Страница 114: ...Mode Dialing Options Stored number Front panel keypad DTR dialing of stored number In band AT commands V 25 bis in band dialing Diagnostics Network CSU and DSU loopbacks User Local DTE and loop remote...

Страница 115: ...r Manual E 3 Environment Operating Temperature 0 O C to 50 O C 32 O F to 122 O F Storage Temperature 20 O C to 70 O C 4 O F to 158 O F Relative Humidity Up to 95 noncondensing Dimensions 2 25 H 8 75 W...

Страница 116: ...Appendix E Specifications Summary E 4 DSU III ARdc User Manual 61200270L1 1...

Страница 117: ...t at irregular intervals by preceding each character with a start bit followed by a stop bit AT commands Also known as the Hayes Standard AT Command Set A language that enables PC com munications soft...

Страница 118: ...and responds to loopback commands sent from the central office A CSU regenerates digital signals monitors them for problems and provides a way of testing the digital circuit clocking An oscillator gen...

Страница 119: ...necting equipment DDS is offered on an inter LATA basis by AT T and on an intra LATA basis by the Bell operating companies data set ready SR A signal on the EIA 232 interface that indicates if the com...

Страница 120: ...class B Radiated and conducted emissions standards set for residential use FCC part 68 FCC Rules and regulations intended to provide protection of the telephone network from harm caused by connection...

Страница 121: ...not lost when the power is shut off out of band Signaling that is separated from the channel carrying information voice data video etc Typically the separation is accomplished by a filter The signali...

Страница 122: ...e sent at arbitrary intervals In order for the computer to make sense of what is coming in each character starts its transmission with a start bit This way if the first bit of the character to be tran...

Страница 123: ...special reference to fire dangers and other hazards to life V 25 bis Automatic calling and answering command set including the ability to work with async bisync and HDLC devices Provides a small subs...

Страница 124: ...Glossary Glossary 12 DSU III ARdc User Manual 61200270L1 1...

Страница 125: ...12 check telco line 12 3 clear to send CS 3 6 6 8 AT commands 6 9 clock source 5 5 configuration 2 4 dial backup 8 1 DTE options 6 1 local 4 1 network options 5 1 test options 7 1 configuration CONFIG...

Страница 126: ...al loopback LLB 7 2 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 keys 3 3 I incoming call 12 2 insta...

Страница 127: ...request to send 3 6 return material authorization RMA 1 3 S scrambler on off 6 2 AT commands 6 2 factory default 6 2 self test 11 18 shift 3 5 status 3 1 synchronous operation 11 1 T telco jack 3 6 te...

Страница 128: ...Index Index 4 DSU III ARdc User Manual 61200270L1 1...

Страница 129: ...Support 888 4ADTRAN Repair and Return If ADTRAN Technical Support determines that a repair is needed Technical Support will coordinate with the Customer and Product Service CAPS de partment to issue...

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