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APPENDIX E: DSU-to-Modem Interconnect

Appendix E. DSU-to-Modem

Interconnect

Modem Tail-Circuit Application

A DSU-to-modem interconnect diagram for a modem tail-circuit application is
shown in Figure E-1.

Figure E-1. DSU to Modem Interconnect.

ETC

DCD

RTS

ETC

RTS

DCD

For Multi-drop requirement:

Содержание MT136A

Страница 1: ... day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com JULY 1998 MT136A MT137C MT138C MT139C MT140C CSU DSU MS DBU CANCEL ENTER 1 4 7 A D SHIFT 2 5 8 0 B E 3 6 9 C F QUICK CSU DSU MS DBU ALM TST CD RD TD CS RS ...

Страница 2: ...f International Business Machines Coporation MCI is a registered trademark of MCI Telecommunications Corporation MNP is a registered trademark of Microcom Systems Inc Siemens is a registered trademark of Siemens Aktiengesellschaft UL is a registered trademark of Underwriters Laboratories Incorporated Sprint and US Sprint are registered trademarks of U S Sprint Communications Co Ltd Any other trade...

Страница 3: ...perated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This di...

Страница 4: ...ato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser referido a personal de servicio calificado 9 El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso La colocac...

Страница 5: ...r una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18 Servicio por personal calificado deberá ser provisto cuando A El cable de poder o ...

Страница 6: ...n the different configuration methods This chapter also provides a front panel menu tree Chapters 6 through 11 provide brief explanations for selections made in the Configuration menus These chapters are based on the front panel menu branches of the Configuration menu Network Options DTE Options Test Options Dial Options Management and Utilities Chapter 12 Testing and Troubleshooting describes the...

Страница 7: ...6 CSU DSU MS DBU Appendix E contains a DSU to modem interconnect diagram for a modem tail circuit application Appendix F contains product specifications ...

Страница 8: ...ase contact Black Box for repair and warranty information The telephone company may require this equipment to be disconnected from the network until the problem is corrected or it is certain the equipment is not malfunctioning 5 This unit contains no user serviceable parts 6 An FCC compliant telephone cord with a modular plug is provided with this equipment In addition an FCC compliant cable appro...

Страница 9: ...r the ISDN Module Service Type SOC REN FIC USOC Basic Rate ISDN 6 0F N A 021S5 RJ 49 11 The REN is useful in determining the quantity of devices you may connect to your telephone line and still have all of those devices ring when your number is called In most areas the sum of the RENs of all devices should not exceed five To be certain of the number of devices you may connect to your line as deter...

Страница 10: ...nt 2B1Q line coding 1B D Service supports up to 64 kbps THE CSU DSU MS DBU ISDN SUPPORTS THE FOLLOWING SWITCH TYPES AND SOFTWARE PROTOCOLS AT T 5ESS Custom 5E6 and later software National ISDN 1 NT1 DMS 100 BCS 32 and later software Pvc1 National ISDN 1 Pvc2 Siemens EWSD National ISDN 1 Request that the ISDN line allocate one DYNAMIC Terminal Endpoint Identifier TEI for the number For service offe...

Страница 11: ...Waiting Hunting InterLata Competition FOR SERVICE OFFERED FROM A NORTHERN TELECOM DMS 100 REQUEST A POINT TO POINT MULTI POINT LINE WITH THE FOLLOWING FEATURES Line Type Basic Rate Functional Electronic Key Telephone Sets EKTS No Call Appearance Handling CACH No Non Initializing Terminal No Circuit Switched Service Yes Packet Switched Service No TEI Dynamic Bearer Service Circuit Switched voice an...

Страница 12: ...ect and Power Up 19 2 2 Rear Panel 20 3 Operation 24 4 Applications 30 4 1 LAN Application with SNMP TELNET Management 30 4 2 Dial Backup Application 33 5 Configuration Overview 36 6 Configuring Network Options 42 6 1 Loop Rate 43 6 2 Network Address 43 6 3 Remote Configuration 44 6 4 Network Type 44 6 5 Clock Source 44 7 Configuring DTE Options 45 7 1 DTE Rate 48 7 2 Connector Type 48 7 3 Data Fo...

Страница 13: ...swer 55 9 3 DBU Options 56 9 3 1 Standard DBU Options 56 9 3 2 DBU Options for S4W 59 9 3 3 DBU Options for V 34 Card 60 9 3 4 DBU Options for ISDN Card 61 9 3 5 DBU Passcode 61 10 Configuring Management Functions 63 10 1 Interface 63 10 2 Control Rate 63 10 3 IP Options 64 10 3 1 Unit IP Address 64 10 3 2 Subnet Mask 64 10 3 3 Gateway IP Address 64 10 3 4 IP Security 64 10 3 5 IP Filter Address 6...

Страница 14: ...isplay 73 12 1 3 Exiting a Test 74 12 2 Troubleshooting 74 12 2 1 Messages from the DSU CSU 74 12 2 2 Troubleshooting New Installations 76 12 3 Local Unit Diagnostics 77 12 3 1 DTE Loop LL 78 12 3 2 Loop Only RT 79 12 3 3 DTE Only 79 12 3 4 DTE With Test Pattern 80 12 3 5 Test Pattern 81 12 3 6 Self Test 82 12 4 Remote Unit Diagnostics 82 12 5 DBU Connection 84 13 Activating Dial Functions 86 14 V...

Страница 15: ...guration DTE Network and Test Options 103 C 2 2 DBU Configuration 103 C 2 3 Management Configuration 104 C 2 4 Utility Configuration 105 C 3 Local Remote Test Menus 106 C 4 Dial SW56 Dial DBU 106 C 4 1 Dial SW56 Options 106 C 4 2 Dial DBU 107 Appendix D Configuration Profiles 108 Appendix E DSU to Modem Interconnect 111 Appendix F Specifications 112 ...

Страница 16: ...4 kbps including 19 2 and 38 4 4 wire Switched 56 SW56 operation Embedded SNMP and TELNET Control port provides SLIP and async PPP access to SNMP or VT100 terminal configuration Two option slots 10BASE T Ethernet SNMP port available with the SNMP Ethernet Module Automatic or manual DBU DBU available with DBU cards options include 4 wire Switched 56 V 34 and ISDN Time of day and weekend lockout opt...

Страница 17: ...tion Dial up 4 wire Switched 56 DDS allows customers to pay for data connection only for the time the unit is active The regional operating companies provide the 4 wire local loop service to SW56 customers The CSU DSU MS DBU supports DTE rates of 2 4 4 8 9 6 19 2 38 4 and 56 kbps synchronous and 2 4 4 8 9 6 19 2 38 4 and 57 6 kbps asynchronous 1 4 SNMP The term SNMP Simple Network Management Proto...

Страница 18: ...cility for the CSU DSU MS DBU TELNET allows a user on a network manager to control the CSU DSU MS DBU through the terminal menus See Chapter 4 and Appendix C for more information 1 6 Dial Backup Operation The CSU DSU MS DBU s unique DBU cards are field installable See Chapter 2 for information on installing DBU cards The three backup options are described in the following sections Contact the loca...

Страница 19: ...chronous mode the throughput at 57 6 kbps is less dependent on data types ISDN MODULE 1B D Basic Rate ISDN service provides the customer with a switched 56 64 kbps circuit In addition to 56 and 64 kbps synchronous DTE rates the card also supports synchronous and asynchronous DTE rates of 2 4 4 8 9 6 19 2 and 38 4 kbps per CCITT V 120 The card also supports the DTE rate of 57 6 kbps async and is co...

Страница 20: ...able and a modular to female DB25 adapter for access to the Control SLIP PPP port NOTE The Black Box CSU DSU MS DBU MIB is available from Black Box in the support section of the Black Box Web page at www blackbox com The following items are included with the DBU Modules DBU Module An 8 position modular to 8 position modular cable for the 4 wire SW56 and 1B D ISDN dial backup options An 8 position ...

Страница 21: ...unded 115 VAC power receptacle CAUTION Power to the DSU must be provided from a grounded 115 VAC 60 Hz receptacle 2 2 Rear Panel The rear panel contains two DTE connectors that provide primary channel V 35 or EIA 232 An 8 pin telco jack a control port a captive power cord and a power switch are also located on the rear panel Pin assignments for these connectors are listed in Appendix A The CSU DSU...

Страница 22: ...evice running SLIP or async PPP protocol V 35 High speed DTE interface Power Switch Turns power on or off 115 VAC Connection Power Cord Connection DDS VT 100 Terminal or device running SLIP or async PPP protocol DTE Device DTE Device RJ45 to DB25 Cable V 35 Cable TELCO EIA 232 DBU INTERFACE LAN INTERFACE 115VAC 60HZ 15A ISDN DBU 10 BASET LAN ON OFF CONTROL V 35 S4W V 34 or ISDN DBU Card 10BASET LA...

Страница 23: ...r this connector is listed in Appendix A Each DBU module has a connector which is used for connection to the switched backup network The pinout for the connector depends on the card type Pinouts for 4 wire Switched 56 V 34 and ISDN 1B D DBU options are shown in Appendix A EIA 232 AND V 35 CONNECTORS DTE DATA CONNECTION PRIMARY DTE The primary DTE should be connected to either the EIA 232 DTE conne...

Страница 24: ...232 compatible interface a device running SLIP protocol or a device running Async PPP protocol An 8 foot adapter connector and cable provide a standard DB25 EIA 232 interface See Appendix A for the control port s pin assignments A description of the operation of this port is in Chapter 3 The control port also functions as the SLIP or async PPP port when configured for SNMP management The pinouts a...

Страница 25: ...n keys numbered 0 through 9 with letters A through F These keys are used to activate menu items and enter information SHIFT Enter letters by pressing and releasing Shift before pressing the key representing the desired character To activate a menu item designated by an alpha character rather than a number press Shift and then the letter The menu item flashes indicating which parameter is activated...

Страница 26: ...flects the status of the Request to Send pin of the DTE interface CS Clear to Send Reflects the status of the Clear to Send pin of the DTE interface TD Transmit Data This LED is active when data is transmitted from the DTE RD Receive Data This LED is active when data is received from the network CD Carrier Detect This LED is active when frame synchronization is achieved and the CSU DSU MS DBU is r...

Страница 27: ...enu such as Network Options NETWORK OPT 5 Activate NETWORK OPT by pressing 1 Press Enter 6 Activate LOOP RATE options by pressing 1 Press Enter 7 Press the number corresponding to the desired loop rate Press Enter Figure 3 2 Example of Basic Menu Navigation FRONT PANEL MENU STRUCTURE The CSU DSU MS DBU uses a multilevel menu approach to access its many features All menu operations are displayed in...

Страница 28: ...nus to control local and remote testing Select local or remote testing and the type of test and test pattern when required For more information see Chapter 12 Configuration Use Configuration menus to select network and DTE operating parameters configure testing and dialing options select management functions and configure unit utilities This menu branch is divided into several chapters for easier ...

Страница 29: ...nter repeatedly until the Terminal Menu appears Figure 3 3 5 Make selections by entering the number corresponding to the chosen parameter Press ESC to return to the previous screen NOTE Due to the increased display capabilities the VT100 menu structure differs from the front panel interface Appendix C includes the VT100 screens as well as a complete menu tree for accessing configuration selections...

Страница 30: ...Figure 3 3 Terminal Interface Main Menu SW56 Mode 29 CHAPTER 3 Operation 1 STATUS 2 LOCAL CONFIG 4 LOCAL TEST 5 REMOTE TEST 6 DIAL SW56 TERMINAL MENU ESC EXIT ENTER SELECTION ...

Страница 31: ...Net Manager NOTE The Black Box CSU DSU MS DBU MIB is available in support section of the Black Box Web page at www blackbox com SNMP and TELNET management are provided by one of the following interfaces A device a router for example running SLIP protocol Connection is made through the CSU DSU MS DBU s control port See Figure 4 1 A device a router for example running async PPP protocol Connection i...

Страница 32: ...tion with SNMP TELNET Management EIA 232 or V 35 EIA 232 or V 35 EIA 232 or V 35 EIA 232 or V 35 Ethernet Ethernet SLIP PPP SLIP PPP DDS or Frame Relay DDS or Frame Relay CSU DSU MS DBU CSU DSU MS DBU CSU DSU MS DBU CSU DSU MS DBU SNMP Management Station SNMP Management Station Router Router Router Router LAN LAN LAN LAN ...

Страница 33: ...umber This address is available from the network administrator Gateway IP Address if required Enter the Gateway node IP address This address is necessary only if the CSU DSU MS DBU and the network manager are connected through a Gateway node This address is available from the network administrator SPECIAL FEATURES OF THIS APPLICATION Customize the SNMP TELNET application using the following CSU DS...

Страница 34: ...or at specified times of the day Dial a specified number when a DBU activation condition is detected Figure 4 3 Dial Backup Application ENTERING DIAL BACKUP MODE When a condition for entering dial backup mode is detected the Alarm LED turns on and the buzzer sounds The buzzer alternates between 30 seconds on and 30 seconds off unless the DDS line is restored or unless it is disabled by using the Q...

Страница 35: ...is inoperative All 1s or all 0s Condition This condition is usually generated by the network to indicate that some device or devices in the network is inoperative Upon detecting an all 1s or all 0s condition the CSU DSU MS DBU initiates a handshake routine to determine whether the remote unit s DTE is the source of the all 1s or all 0s condition or whether an actual network failure exists Answer A...

Страница 36: ...to be returned to the DDS manually Once the CSU DSU MS DBU enters dial backup mode the unit polls the DDS circuit once every 100 ms to determine if the condition causing the DDS circuit failure has been corrected Once the CSU DSU MS DBU determines that the problem has been properly corrected and the DDS circuit is stable it will wait for the amount of time specified in the restore timer 1 to 255 m...

Страница 37: ...ion memory The CSU DSU MS DBU is then configured with that profile every time power is turned on or the unit is reset Configuration Methods The CSU DSU MS DBU responds to the following methods of configuration AT commands V 25 commands Front panel commands A VT100 compatible terminal SNMP TELNET through a device running SLIP PPP protocol SNMP TELNET through a LAN running Ethernet protocol availabl...

Страница 38: ...d escape sequence to occur the DTE must transmit the escape code character three times in succession with delay between each character being less than the guard time Once the command mode is entered AT commands can be transmitted to the CSU DSU MS DBU to configure most of the options or initiate tests to check both the CSU DSU MS DBU and the network connections All command lines must begin with AT...

Страница 39: ... 1 MASTER 2 FROM NETWORK 3 TEST OPTIONS 4 DIAL OPTIONS 1 TEST TIMOUT 2 RDL EN DIS 3 EIA LLB EN DIS 4 EIA RLB EN DIS 5 DBU ANS TEST ENTER TIMOUT 0 OFF 00 SEC 1 RDL IGNORED 2 RDL ACCEPTED 1 DISABLED 2 ENABLED 1 DISABLED 2 ENABLED 1 DISABLED 2 ENABLED 5 MANAGEMENT 6 UTILITIES 1 MANUAL COMMAND 2 TIME DATE COMMAND 00 1 CURRENT 2 SET TIME COMMAND HH VALUE 00 TIME 23 01 59 DATE 08 15 97 1 SET HOURS 2 SET...

Страница 40: ...FF OOS ONLY 3 OFF LOCD ONLY 4 OFF TEST ONLY 5 OFF TEST OOS 6 OFF TEST LOCD 1 INTERFACE 2 CONTROL RATE 1 VT100 CONTROL 2 SLIP CONTROL 3 PPP CONTROL 4 ETHERNET LAN ENTER CURRENT HOUR HH 01 ENTER CURRENT MIN MM 01 ENTER CURRENT SEC SS 01 3 IP OPTIONS 4 SNMP OPTIONS ENTER CURRENT MONTH MM 01 ENTER CURRENT DAY DD 07 ENTER CURRENT YEAR YY 97 5 TELNET OPTIONS 1 GET COMMUNITY 2 SET COMMUNITY 3 TRAP COMMUN...

Страница 41: ... bis COMMAND FCS F The address field A is FFH The control field C is set to 13H except for cases of multi frame responses For this case the control field is set to 03H in all but the last frame The 03H in the control field indicates that other frames are 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 Structu...

Страница 42: ... to pass AT commands to the local DSU via the V 25 bis command processor This allows the CSU DSU MS DBU to be configured with AT commands using a synchronous interface The format is as follows CNL LOCAL PASSWORD AT ONE OR MORE AT COMMANDS A local password may not be required depending on the present configuration of the unit Responses to CNL commands are returned in the data format currently confi...

Страница 43: ...ble 6 1 shows the AT commands used to set the Network Options See Figure 6 1 for the Network Options menu tree Table 6 1 Network Options AT Commands Front Panel AT Command Loop Rate AUTO B0 2 4K B1 4 8K B2 9 6K B3 19 2K B4 38 4K B5 56K B6 64K B7 Network Address XX decimal _N xx Remote Configuration 1 DISABLED P4 2 ENABLED P5 Network Type 1 DEDICATED none 2 AT T MCI SW56 none 3 US SPRINT SW56 none ...

Страница 44: ...mmands that perform the same configuration functions 6 2 Network Address A two digit decimal address can be assigned to each CSU DSU MS DBU This addressing capability makes it possible to perform remote configuration and testing in point to point and multi drop networks Figure 6 1 shows the menu path used to change the network address The factory default setting is 0 3 CONFIG 1 LOCAL 2 REMOTE ENTE...

Страница 45: ...etwork Type Select the appropriate network type The choices are dedicated AT T MCI SW56 and US Sprint SW56 6 5 Clock Source The Clock Source option specifies the timing source for the CSU DSU MS DBU s internal circuitry The factory default setting is From Network When operating on a DDS network the timing should be From Network On a point to point private network one CSU DSU MS DBU must be set for...

Страница 46: ... CS OPTIONS 7 ANTI STREAM 8 CD OPTIONS 9 TR OPTIONS A SR OPTIONS 1 2 4K 2 4 8K 3 9 6K 4 19 2K 5 38 4K 6 56K 57 6K 7 SAME AS LOOP 1 EIA 232 2 V 35 1 ASYNCHRONOUS 2 SYNCHRONOUS 1 DISABLED 2 AT COMMAND SET 3 V 25 SYNC 4 V 25 BSC ASYNC 1 FORCED ON 2 FOLLOWS RS 3 FOLLOWS CD 4 FOLLOWS RS CD 5 OFF WITH LOCD 1 TIMER OFF 2 TIME 10 SEC 3 TIME 30 SEC 4 TIME 60 SEC 1 SCRAMBLER OFF 2 SCRAMBLER ON 3 SUPPRESS LB...

Страница 47: ...ble code LBE in transmit data from the DTE after 30 bytes in a row detected 64 kbps loop rate only Data Format 1 ASYNCHRONOUS Q0 Asynchronous DTE operation mode 2 SYNCHRONOUS Q2 Synchronous DTE operation mode DTE CMD Option 1 DISABLED none Disables all DTE command modes 2 AT COMMAND SET none Enables AT command mode for DTE 3 V 25 SYNC none Enables V 25 SDLC command mode for DTE 4 V 25 BSC ASYNC no...

Страница 48: ...RCED ON C0 On all the time 2 NORMAL C1 On only when data present on loop 3 OFF WITH LOCD C2 On except after disconnect SW56 only TR Options 1 IGNORED D0 Ignore the TR input 2 IDLE WHEN OFF D2 See the note on the next page 3 OFF ON DIAL 1 D3 Dial Stored 1 TR goes off to on SW56 only 4 OFF ON DIAL 2 D4 Dial Stored 2 TR goes off to on SW56 only 5 NO DBU IF OFF D3 No dial backup if TR is off valid onl...

Страница 49: ...he factory default setting is Scrambler Off CAUTION 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 prevents this the Scrambler On option should be selected for both the local and remote CSU DSU MS DBU 7 2 Connector Type The Connector Type option is used to specify which ...

Страница 50: ...or 56 kbps and 64 kbps applications Using this option eliminates data errors caused by excessive delays in the DTE transmit clock receiver and transmit data driver The Invert clock option is recommended when the EIA 232 connector is used for rates other than 56 kbps or 64 kbps 7 6 Clear to Send CS Options The CS Options menu is used to select the control mode for the CS lead The default factory se...

Страница 51: ...ds 7 8 CD Options The CD Options menu is used to select the control mode for the receive line signal detector CD lead The factory default setting is Normal Table 7 1 shows the equivalent AT commands for setting CD options 7 9 Data Terminal Ready TR Options The TR Options menu is used to select the CSU DSU MS DBU response to the Data Terminal Ready TR lead The factory default setting is Ignored Tab...

Страница 52: ...The available options and their AT commands are listed in Table 8 1 Figure 8 1 Test Options Menu Tree 3 CONFIG 1 LOCAL 2 REMOTE ENTER ADDRESS 1 NETWORK OPT 2 DTE OPTIONS 3 TEST OPTIONS 4 DIAL OPTIONS 5 MANAGEMENT 6 UTILITIES 1 TEST TIMEOUT 2 RDL EN DIS 3 EIA LLB EN DIS 4 EIA RLB EN DIS 5 DBU ANS TEST 1 DISABLED 2 ENABLED 1 DISABLED 2 ENABLED 1 DISABLED 2 ENABLED ENTER TIMEOUT 0 OFF 00 SEC 1 RDL IG...

Страница 53: ...s DBU tests from far end TEST TIMEOUT The Test Timeout option sets the length of time a CSU DSU MS DBU remains in a test mode before automatically returning to the data mode Enter the timeout as a two digit decimal value The factory default setting is off 0 REMOTE DIGITAL LOOPBACK RDL The RDL option specifies whether the CSU DSU MS DBU responds to an RDL request from the far end of the circuit The...

Страница 54: ... DDS In order for this test to be performed DBU Answer Test must be enabled on the remote unit If DBU Answer Test is not enabled the remote unit will not accept a DBU test from the other end The factory default setting is Disabled NOTE The DBU Answer Test is not available if the DBU Criteria option Answer Always is Enabled ...

Страница 55: ...F 0 MIN 6 REDIAL COUNTER 7 FAIL TIMER 8 WAIT TO REDIAL ENTER REDIAL COUNT 0 AUTO DBU FAIL TIME 0X10 SEC WAIT TO REDIAL TIME 0 SEC 9 NETWORK TYPE 1 AT T MCI OTHER 2 US SPRINT 9 ERROR CONTROL 1 BUFFERED 2 DIRECT 3 RELIABLE MNP 4 AUTO MNP 5 RELIABLE V 42 6 REL V 42 MNP 7 AUTO V 42 MNP A FLOW CONTROL 1 DISABLED 2 XON XOFF 3 CTS ONLY 4 RTS CTS 5 UNI XON OFF B COMPRESSION 1 DISABLED 2 ENABLED 9 SWITCH T...

Страница 56: ...is assigned by the telco when the ISDN line is installed and normally resembles a phone number Only the AT T 5ESS switch is capable of recognizing a point to point configuration eliminating the need for a SPID All other switch types require a SPID Setting the Local Directory LDN Number For ISDN dial backup the LDN is stored in Stored Number 10 Table 9 1 AT Commands for Storing Phone Numbers AT Com...

Страница 57: ...U originates or waits to answer if the dedicated circuit fails One end must be set to Originate and the other to Answer The factory default setting is Answer DBU Criteria These options specify the conditions that will cause the CSU DSU MS DBU to enter the backup mode When Out of Service OOS When enabled the CSU DSU MS DBU enters backup mode if an out of service condition is detected The factory de...

Страница 58: ...out End Enter the hour that the daily lockout ends and dial backup is reactivated 0 to 23 Only applies if the Daily Lockout parameter is ENABLED Auto Restore Once the DDS circuit is down the CSU DSU MS DBU remains in 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 the restore timer is set to 0 the DDS mu...

Страница 59: ...econds WAIT TO REDIAL TIME __ __ SEC Transition Timer Dial Backup Option This option sets the amount of time the DSU keeps the DBU connection up after the auto restore function transitions back to the dedicated circuit The factory default setting is 60 seconds A value of 0 seconds causes the DSU to drop the DBU call immediately after transition to the dedicated line Table 9 2 DBU Options AT Comman...

Страница 60: ...dition WEEKEND LOCKOUT 1 Disabled none Disables weekend lockout feature 2 Enabled none No backup occurs from midnight Friday to midnight Sunday DAILY LOCKOUT 1 Disabled none Sets dial backup lockout starting hour 2 Enabled none Sets dial backup lockout ending hour LOCKOUT START none Sets hour to enable dial backup LOCKOUT END none Sets hour to disable dial backup Auto Restore S31 x Sets restore ti...

Страница 61: ...eved For synchronous applications the speed is limited to a maximum of 33 6 kbps for the V 34 Card The factory default setting is Enabled Table 9 3 DBU Options AT Commands for V 34 Card DBU Options CMD AT Description Error Control 1 BUFFERED N0 Normal operation No error control Allows speed matching buffering and flow control 2 DIRECT N1 Direct operation No error control no buffer and no flow cont...

Страница 62: ...ression disabled 2 ENABLED C1 Compression enabled 9 3 4 DBU OPTIONS FOR ISDN CARD SWITCH TYPE This option selects the type of telco CO switch providing the ISDN service There are three options for ISDN switch types AT T 5ESS NT DMS 100 National ISDN 9 3 5 DBU PASSCODE The dial backup passcode adds an additional level of security to the CSU DSU MS DBU A passcode of one to ten characters can be prog...

Страница 63: ...asscode message to the originate unit and terminates the dial backup connection If a passcode is not received by an answer unit with passcode enable or if the Passcode OK message is not received by an originate unit with passcode enabled the dial backup connection is terminated ...

Страница 64: ...pplies when the interface options is set for VT100 terminal SLIP or PPP 3 CONFIG 1 LOCAL 2 REMOTE ENTER ADDRESS 1 NETWORK OPT 2 DTE OPTIONS 3 TEST OPTIONS 4 DIAL OPTIONS 5 MANAGEMENT 6 UTILITIES 1 INTERFACE 2 CONTROL RATE 3 IP OPTIONS 4 SNMP OPTIONS 5 TELNET OPTIONS 1 TELN PASSWORD 2 TELNET TIMEOUT 1 VT 100 CONTROL 2 SLIP CONTROL 3 PPP CONTROL 4 ETHERNET LAN 1 1200 BPS 2 2400 BPS 3 9600 BPS 1 UNIT...

Страница 65: ...ed decimal notation This address is necessary only if the CSU DSU MS DBU and network manager are connected through a Gateway node If an IP packet with an unknown IP address is received the CSU DSU MS DBU sends it to the Gateway 10 3 4 IP SECURITY Enable disable the IP security option If enabled the CSU DSU MS DBU only accepts management commands from the IP addresses up to 5 entered into the IP Fi...

Страница 66: ... to the network manager The default value is MT136A If using front panel entry see Section 10 6 for more information SNMP TRAPS Specify which traps the CSU DSU MS DBU will send to the network manager When enabled the CSU DSU MS DBU sends SNMP traps to network managers for alarm conditions The options are DISABLE GENERIC ONLY and ENABLE ALL The GENERIC ONLY option enables the Generic Standard traps...

Страница 67: ...e TELNET session 10 6 Entering Letters Using the Front Panel Some Management menus require the entry of letters rather than numbers When configuring the unit using the front panel special steps must be taken in order to perform these entries The following example of entering the TELNET Password illustrates this procedure 1 Press 5 then Enter to select TELNET OPTIONS from the Management menu 2 Pres...

Страница 68: ...fies movement from field to field When you see a black cursor pressing the Up Arrow key deletes the current entry of that field Pressing the Down Arrow key advances the cursor to the next field An underscore cursor signifies letter entry When you see an underline cursor pressing the Up and Down Arrow keys scrolls the alphabet ...

Страница 69: ...ommands are not available for this menu Figure 11 1 Utilities Menu Tree 3 CONFIG 1 LOCAL 2 REMOTE 1 NETWORK OPT 2 DTE OPTIONS 3 TEST OPTIONS 4 DIAL OPTIONS 5 MANAGEMENT 6 UTILITIES 1 MANUAL COMMAND 2 TIME DATE 3 SOFTWARE REV 4 LAN MAC ADDR 5 SERIAL NUMBER COMMAND 00 1 CURRENT 2 SET TIME 3 SET DATE VERSION CHKSUM REV X XXXX COMMAND HH VALUE 00 TIME 23 01 59 DATE 08 15 97 1 SET HOURS 2 SET MINUTES 3...

Страница 70: ...t 1 MANUAL COMMAND 5 The first display prompts you for command number entry COMMAND 00 Use the Up Arrow key to delete the current entry then use the number keys to enter the new value Press Shift to activate letters A F 6 Press Enter to complete the Command entry 7 Once the command number is entered the display shows both the command number and the present value or setting for the command The comm...

Страница 71: ...r 5 00 to FF AT Escape Char Timer 0C 00 to FF Abort Call Timer 7 00 to FF DTR Recognize Delay 19 00 to FF DTR Initiated Command Timeout 28 00 to FF Load Factory Opt Option Set 1 8A 00 Option Set 2 8A 01 Option Set 3 8A 02 Option Set 4 8A 03 Network Address Lock Network Addr Unlock C3 00 Network Addr Lock C3 01 Front Panel En Dis Disable AA 00 Enable AA 01 11 2 Time Date View set the current time a...

Страница 72: ...ar 2000 compliance 11 3 Software Revision View the current revision of the software installed in the CSU DSU MS DBU 11 4 LAN MAC Address View the LAN MAC address This address is available when the SMP Ethernet Module is installed 11 5 Serial Number View the CSU DSU MS DBU s serial number ...

Страница 73: ...lso responds to standard DDS network tests initiated from telco test centers In addition it can run several tests such as local and remote loopbacks to aid in problem isolation See Figure 12 1 Figure 12 1 Normal Operation Before Initiating Loopback Test CAUTION All diagnostic tests disrupt data flow 12 1 1 INITIATING A TEST Initiate tests using the following procedure 1 Select Test from the Main m...

Страница 74: ...s similar to the status screen described in Chapter 14 with additional prompts for the type of test and the number of errors for tests with a test pattern Figure 12 3 shows an example of a Test Status Display for a test with a test pattern Figure 12 3 Sample Test Status Displays TEST PATTERN TST ERR 00 LOOP 56K DTE 56K SYNC TR SR LLB RLB OFF OFF OFF OFF UNIT IN TEST LOOP IS NORMAL While this menu ...

Страница 75: ...suspected problems associated with local or remotely attached Black Box DSU CSUs 12 2 1 MESSAGES FROM THE DSU CSU Messages on the LCD display and LEDs give information concerning the status of the unit and the local loop If the Alarm LED is On one or more of the messages shown in Table 12 1 are displayed on the LCD 2 TEST 1 LOCAL UNIT 2 REMOTE UNIT 3 DBU CONNECTION 1 DIAL STORED 2 ENTER DIAL 3 RED...

Страница 76: ...t to telco contact telco provider No RX signal Unit detects sealing Bad conductor Replace telco cable current but no data in telco cable from DSU to wall jack signal from telco from DSU to If a problem persists telco jack or bad contact telco provider circuit to telco OOS OOF Unit detects an out of Telco is having Check remote unit from net service or out of frame problems with Contact telco servi...

Страница 77: ...S loop rate of the DDS circuit Data Format Async or Sync From the Configuration menu select the type of data to be used DTE Cable N A Verify DTE cable connection to the proper DTE connector on the DSU CSU Telco Cable N A Verify the telco cable is securely connected to the DSU CSU and wall jack Power the unit N A Verify the unit passes self test during Off then On power up displayed on the LCD Test...

Страница 78: ...ts see Table 12 3 Table 12 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 Network Interface DTE Only T1 TX RX Loopback at DTE Interface DTE with TP T8 TX RX Loopback with Test Pattern Test Pattern T9 Transmit Receive Test Pattern Self Test Z Check Internal Components Resets Unit Exit Test T0 Stops test retu...

Страница 79: ...ets 0111 1110 followed by 100 octets 0000 0000 5 STRESS PTRN 3 _T4 T8 Stress pattern with medium ones density Continuous series of octets 0011 0010 6 STRESS PTRN 4 _T5 T8 Stress pattern with low ones density Continuous series of octets 0100 0000 12 3 1 DTE LOOP LL The DTE Loop test splits the CSU DSU MS DBU into two separate DTE and loop interface sections and then loops the receive data of each i...

Страница 80: ...paths for this test Figure 12 6 Loop Only Test Test Purpose The Loop Only test is used to provide a loopback for network tests 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 the local CSU DSU MS DBU 12 3 3 DTE ONLY The DTE Only test provides a method for testing both the DTE interface drivers and ...

Страница 81: ...ATTERN The DTE with TP test pattern test exercises the internal data paths of the CSU DSU The transmit data is looped back to the receive data at a point close to the physical network interface The test pattern is generated using the DSU CSU s internal test pattern generator This test can be used to detect deficiencies within the internal circuitry of the CSU DSU MS DBU Figure 12 8 illustrates the...

Страница 82: ... 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 12 3 5 TEST PATTERN The Test Pattern option converts the local CSU DSU MS DBU into a BERT tester for the purpose of testing the DDS circuit If this test is used the remote DSU CSU must be in loopback or transmitting a test...

Страница 83: ... and is recommended if there is any question about the DSU s health Test Purpose The purpose of this test is to determine if the DSU is functioning properly Interpreting Test Results Once Self Test is activated the LEDs cycle on and off as the system runs the self test A pass or fail status will be displayed on the LCD along with a checksum indicating the current firmware revision 12 4 Remote Unit...

Страница 84: ...remote CSU DSU MS DBU into loopback Figure 12 11 Initiating a Remote Test After selecting Remote Unit from the menu the following prompt is displayed for entering the address for the remote unit Enter Test Unit Address XX 2 TEST 1 LOCAL UNIT 2 REMOTE UNIT 3 DBU CONNECTION ENTER TEST UNIT ADDRESS 0 1 2047 PATTERN 2 511 PATTERN 3 STRESS PTRN 1 4 STRESS PTRN 2 5 STRESS PTRN 3 6 STRESS PTRN 4 7 DATA F...

Страница 85: ...main line When this option is selected choose a stored number enter a number to dial or redial the last dialed number After establishing DBU connection the CSU DSU MS DBU designated at the answer unit is placed into loopback and a test pattern is transmitted from the originate unit to the answer unit Receive data is checked for errors and the results displayed on the front panel While running this...

Страница 86: ...nitiating Follow the menu path outlined in Figure 12 13 to initiate a DBU connection test Figure 12 13 Initiating a DBU Connection Test Interpreting Test Results If the unit is functioning properly the CSU DSU MS DBU displays DBU TEST PATTERN TST ERR 0000 2 TEST 1 LOCAL UNIT 2 REMOTE UNIT 3 DBU CONNECTION 1 DIAL STORED 2 ENTER DIAL 3 REDIAL LAST 1 98376113 2 EMPTY 3 EMPTY 4 EMPTY 5 EMPTY 6 EMPTY 7...

Страница 87: ...ar as shown in Figure 13 1 If DEDICATED is selected and a DBU card is installed the options appear as shown in Figure 13 2 Figure 13 1 Dial Options Menu SW56 Figure 13 2 Dial Options Menu Dedicated 4 DIAL 1 DIAL BACKUP 1 DIAL BACKUP 2 STAY ON LEASED 1 HANG UP 2 STAY ON LINE COMMAND ACCEPTED 1 DIAL STORED 2 ENTER DIAL 3 REDIAL LAST Selected Stored Number 1 A NNNNNNN 4 DIAL 1 DIAL STORED 2 ENTER DIA...

Страница 88: ...up ORIGINATE UNIT CONNECTED TO DDS LINE Dial Backup The CSU DSU MS DBU prompts to dial a stored number or enter a number to dial for dial backup Stay on Leased The CSU DSU MS DBU remains on the leased line and does not enter dial backup mode DIAL OPTIONS DURING DIAL BACKUP Hang Up Terminates the dial backup connection and attempts to re establish communication on the DDS line Stay On Line This CSU...

Страница 89: ... OF DIAL BACKUP SERVICE This display line see Figure 14 1 indicates the type of dial backup service installed in the CSU DSU MS DBU The following messages are displayed according to the dial backup option installed in the CSU DSU MS DBU ISDN DBU Status 1 B D Basic Rate ISDN backup option installed SW56 DBU Status 4 wire Switched 56 backup option installed V 34 DBU Status V 34 backup option install...

Страница 90: ...S DBU is entering dial backup mode Idle Messages are not being transmitted but the service is immediately available for use Incoming Call Incoming call messages being received In Dial Backup The CSU DSU MS DBU is currently in dial backup mode No RX Signal Sealing current detected but no data signal received from telco Also indicates ISDN line is inactive No wink from CO Switched 56 provider encoun...

Страница 91: ...t the CSU DSU MS DBU is set to SW56 mode Getting TEI The ISU card is getting its first terminal endpoint identifier from the network Register SPID The ISU card is registering its first SPID with the network DSU OPERATION AND NETWORK STATUS Current CSU DSU MS DBU Status This display line see Figure 14 1 indicates current CSU DSU MS DBU status Possible messages are Data Mode In data mode the Data Se...

Страница 92: ...BU This message is displayed briefly while switching from the dedicated service to dial backup mode In Dial Backup The DSU is in dial backup mode LL Test From Telco An LL test has been initiated from the telco Loop is Normal The DSU is connected to the dedicated line OOS OOF The telco is transmitting an out of service code Open Loop The DDS physical connection has been broken Waiting for Call The ...

Страница 93: ...rom 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 Network to DSU Ring Table A 2 Pin Assignments for DBU Card Connectors Pin Name Description 4 wire Switched 56 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 Ti...

Страница 94: ...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 Transmit Clock TC 17 DD Receive Clock RC 18 Local Loopback LL 20 CD Data Terminal Ready TR 21 Remote Loopback RL 22 CE Ring Indicator RI 24 DA External TX Clock ETC 25 Test Indicator TI ...

Страница 95: ...Data RD A T 104 Received Data RD B V 115 Receiver Signal Element Timing SCR A X 115 Receiver Signal Element Timing SCR B P 103 Transmitted Data SD A S 103 Transmitted Data SD B Y 114 Transmitter Signal Element Timing SCT A AA 114 Transmitter Signal Element Timing SCT B U 113 External TX Signal Element SCX A W 113 External TX Signal Element SCX B NN Test Indicator TI Table A 5 Pin Assignments for C...

Страница 96: ...tains the serial output data stream transmitted onto the network 2 TD The negative signal for the TD differential pair pins 1 and 2 3 RD The positive signal for the RD differential pair This signal contains the serial input data stream received from the network 4 5 N A not used 6 RD The negative signal for the RD differential pair pins 3 and 6 7 8 N A not used ...

Страница 97: ... ATVn Result Code From Firmware 1 ATZ Self Test none AT Cn CD Option 0 AT Dn TR Option 0 AT Fn Restore Factory Defaults none AT Ln Network Type 0 AT Pn Remote Configuration AT Qn DTE Data Format 0 AT Rn CS Options 0 AT Sn_Cn SR Options 0 AT Zn x Store Phone Number none AT Nn Error Control V 34 DBU 0 AT Qn Flow Control V 34 DBU AT Tn Inactivity Timer AT Bn Loop Rate Select 0 AT Cn Compress Option V...

Страница 98: ...rambler Control 0 AT_Gn DBU When OOS 0 AT_Hn DBU When No RX Signal 0 AT_In DBU When No Sealing Current 0 AT_Jn Auto Answer Enable Disable 0 AT_Kn DBU Enable Disable 0 AT_Ln DTE Routing Main Backup 0 AT_N xx Set Network Address none AT_Pn Front Panel Enable Disable 0 AT_Rn RLB Enable Disable 0 AT_S xx Set Serial Number none AT_Tn Select Test Pattern 0 AT_Xn Clock Source Select 0 AT_Yn Secondary Cha...

Страница 99: ...hout this manual based on the front panel menu structure See Figure 5 1 for the front panel configuration menu tree The terminal Main menu is the opening menu to all operations of the CSU DSU MS DBU Select one of the choices by pressing the corresponding number then press Enter See Figure C 1 NOTE The Dial selection in the terminal Main menu is determined by two things the Network Type selected in...

Страница 100: ...gure C 1 Terminal Interface Main Menu SW56 Network Type Selected 99 APPENDIX C Terminal Menu Structure 1 STATUS 2 LOCAL CONFIG 4 LOCAL TEST 5 REMOTE TEST 6 DIAL SW56 ESC EXIT ENTER SELECTION TERMINAL MENU ...

Страница 101: ... XMIT 511 PTRN 12 15 XMIT DDS PTRNS 1 4 16 SELF TEST 5 REMOTE TEST 6 DIAL ESP DBU 1 GO TO DIAL BACKUP 2 DBU ONLINE TEST DEDICATED network type with no DBU card installed 6 N A SW56 network type 6 DIAL SW56 1 DIAL STORED NUMBER 2 MANUAL DIAL ENTRY DEDICATED network type with DBU card installed 1 DSU 2 DIAL BACKUP 3 DIAL DIRECTORY 4 MANAGEMENT 5 UTILITY 1 REMOTE ADDRESS 2 DATA FROM DTE 3 2047 TEST P...

Страница 102: ...ILTER ADDRESS 1 5 1 DTE RATE 2 CONNECTOR TYPE 3 DTE DATA FORMAT 4 ASYNC WORD LENGTH 5 DTE CMD SET 6 TRANSMIT CLOCK 7 CS CONTROL 8 RS CS DELAY 9 ANTI STREAM 10 CD CONTROL 11 TR CONTROL 12 SR CONTROL 13 SCRAMBLE 64K 1 SYSTEM NAME 2 SYSTEM LOCATION 3 SYSTEM CONTACT 4 SNMP GET COMMUNITY 5 SNMP SET COMMUNITY 6 SNMP TRAP COMMUNITY 7 SNMP TRAPS 8 AUTHENTICATION TRAPS 9 13 TRAP HOST IP ADDRESS 1 5 14 LOOP...

Страница 103: ...enu shown in Figure C 4 After entering the address the menu in Figure C 5 appears Figure C 4 Remote Configuration Options 102 CSU DSU MS DBU UNIT LOOP STATUS DTE LEADS LOOP RATE SWITCHED 56K RT OFF DTE RATE 57 6K CTS OFF DTE FORMAT ASYNC TD OFF TEST STATUS NO TEST RD OFF SELF TEST PASS DCD OFF SOFTWARE REV BETA A DSR OFF CHECKSUM 1132 DTR OFF DBV TYPE NONE LL OFF LOOP STATUS OPEN LOOP RL OFF SW56 ...

Страница 104: ...stalled make sure that the card is properly seated in the slot and then restart the unit 103 APPENDIX C Terminal Menu Structure 1 DSU 2 DIAL BACKUP 3 DIAL DIRECTORY 4 MANAGEMENT 5 UTILITY CONFIGURATON MENU ESC EXIT ENTER SELECTION _ DTE OPTIONS NETWORK TEST COMMANO OPTIONS 1 DTE RATE 56K 64K SAME AS LOOP 14 LOOP RATE AUTO 2 CONNECTOR TYPE V 35 15 NETWORK ADDRESS 0 3 DTE DATA FORMAT SYNCHRONOUS 16 ...

Страница 105: ...NS 14 W NO SEAL CURR DIS 5 AUTO RESTORE TIMER 1 15 ALL 1s 0s DIS 6 REDIAL COUNTER 5 16 ANSWER ALLWAYS DIS 7 FAIL COND TIMER 3 17 WEEKEND LOCKOUT DIS 8 WAIT TO REDIAL 10 18 DIALY LOCKOUT DIS 9 DBU NETWORK TYPE US SPRINT 19 LOCKOUT EN HOUR 17 10 DBU ONLINE TEST DIS 20 LOCKOUT DIS HOUR O8 S4W DIAL BACKUP 104 CSU DSU MS DBU 1 SNMP 2 INTERFACE TERM 3 CONTROL RATE 9 6K 4 IP ADDRESS 198 79 126 59 5 SUBNE...

Страница 106: ...CATION LOCATION 3 SYSTEM CONTACT CONTACT 4 SNMP BET COMMUNITY PUBLIC 5 SNMP SET COMMUNITY PRIVATE 6 SNMP TRAP COMMUNITY DSUIV 7 SNMP TRAPS GENERIC ONLY 8 AUTHENTICAITON TRAPS DIS 9 TRAP HOST IP ADDR 1 000 000 000 000 10 TRAP HOST IP ADDR 2 000 000 000 000 11 TRAP HOST IP ADDR 3 000 000 000 000 12 TRAP HOST IP ADDR 4 000 000 000 000 13 TRAP HOST IP ADDR 5 000 000 000 000 SNMP ESC EXIT ENTER SELECTI...

Страница 107: ...ED Network Type is selected the Dial DBU selection is shown instead C 4 1 DIAL SW56 OPTIONS This menu see Figure C 13 is available when operating in SW56 mode Choose to dial a stored number or enter a number manually 1 DTE LOOP 10 XMIT 2047 PTAN 2 LOOP ONLY 11 XMIT 511 PTRN 3 DTE LOOPBACK 12 XMIT DDS PTRN 1 4 DTE 2047 PTAN 13 XMIT DDS PTRN 2 5 DTE 511 PTRN 14 XMIT DDS PTRN 3 6 DTE DDS PTRN 1 15 XM...

Страница 108: ...d in the CSU DSU MS DBU and the Network Type is set to DEDICATED See Chapter 13 for more information on individual menu selections Figure C 14 Dial DBU Menu 1 DIAL STORED NUMBER 2 MANUAL DIAL ENTRY DIALING MENU ESC EXIT ENTER SELECTION _ DBU OPERATIONS 1 GO TO DIAL BACKUP 2 DBU ONLINE TEST DBU CONTROL MENU ESC EXIT ENTER SELECTION _ ...

Страница 109: ...n EIA 232 connector Automatic DBU has been disabled for this configuration profile PROFILES 3 AND 4 Profiles 3 and 4 are identical to profile 1 with the addition of dial backup capability These profiles are used for enabling dial backup using two CSU DSU MS DBU One must be set for Answer and the other for Originate Use profile 3 to set the remote unit to Answer and profile 4 to set the host unit t...

Страница 110: ...ource From From From From Network Network Network Network DTE Options Remote DSU Address 0 0 0 0 DTE Rate 56k loop 56k 57 6k 56k 57 6k 56k 57 6k 56k 57 6k Scrambler Mode OFF OFF OFF OFF Connector Type V 35 RS232 V 35 V 35 DTE Data Format SYNC ASYNC SYNC SYNC DTE Command Options DIS DIS DIS DIS Transmit Clock Normal Normal Normal Normal CS Options Follow RS Follow RS Follow RS Follow RS Anti stream...

Страница 111: ... Answer Answer Originate DBU when OOS Enable Enable Enable Enable DBU when No RX Signal Enable Enable Enable Enable DBU when No Sealing Current Enable Enable Enable Enable DBU Auto Restore Timer 1 minute 1 minute 1 minute 1 minute DBU Redial Counter 5 5 5 5 DBU Fail Timer x10 seconds 3 3 3 3 DBU Redial Wait Time 10 10 10 10 When all 1s 0s Disable Disable Disable Disable Network Type AT T AT T AT T...

Страница 112: ...dem Tail Circuit Application A DSU to modem interconnect diagram for a modem tail circuit application is shown in Figure E 1 Figure E 1 DSU to Modem Interconnect M O D E M D S U I V RC ETC RD TD DCD RTS ETC RC TD RD RTS DCD For Multi drop requirement M O D E M C S U D S U M S D B U ...

Страница 113: ...nd 64 kbps Switched mode service rate 56 kbps Dial Backup Switched 56 56 kbps V 34 2 4 to 33 6 kbps ISDN 56 or 64 kbps DTE Rates Provided DTE rates match service rates DTE to loop rate matching in both dedicated and switched modes Synchronous rates 2 4 4 8 9 6 19 2 38 4 56 and 64 kbps Asynchronous rates 2 4 4 8 9 6 19 2 38 4 and 57 6 kbps DTE Interfaces Both EIA 232 and V 35 electrical and physica...

Страница 114: ...raps Clocking Normal DDS slaved to network receive clock Private network master internal Normal DDS tail circuit Private network master slaved to external clock Switched Mode Dialing Options Stored number Front panel keypad DTR dialing of stored numbers In band AT commands V 25 bis in band dialing Diagnostics Network CSU and DSU loopbacks User Local DTE and loop remote V 54 Test Patterns 2047 511 ...

Страница 115: ...ire full duplex Receiver Sensitivity 45 dB at all rates Agency Approvals UL 1950 C U L 1950 FCC Part 15 Class A FCC Part 68 CS03 Environment Operating Temperature 32 to 122 F 0 to 50 C Storage Temperature 4 to 158 F 20 to 70 C Relative Humidity Up to 95 noncondensing Hardware Specifications Dimensions 2 4 H x 8 W 10 4 D 6 1 x 20 3 x 26 4 cm Weight 4 5 lb 2 kg Power 115 VAC 75 mA max 8 6 watts ...

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