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103

Chapter 7 - Troubleshooting

7.9 Composite Link Statistics

Table 7-9. Composite Link Statistics

Step

Procedure

1

Toggle DIP switch position 3 to the down (closed) position to enable the command port.

2

Connect a terminal or PC running communications software to the DATA/COMMAND
connector on the back panel of the DataTalker.

Note:

Any cables connected to the computer should be shielded to reduce interference.

3

Apply power to the DataTalker.

4

Apply power to the terminal or PC. Run the PC’s communications software in terminal mode
and press ENTER twice to establish communications with the DataTalker. The Main Menu
appears:

Main Menu

1 - Configurations
2 - Statistics
3 - Reset Options
4 - Diagnostics
5 - Exit Command Mode
6 - QUICK SETUP

Selection : _

5

Enter 2 and press ENTER. The Statistics menu is displayed:

Statistics

1 - View Composite Link Statistics
2 - Clear Composite Link Statistics
M - Main Menu
P - Previous Menu

Selection : _

6

Enter 1 and press ENTER to view the composite link statistics:

Composite Link Statistics

Elasped Time : 00 Days 00 Hours 00
Minutes
Data Blocks Transmitted : 0
Data Blocks Retransmitted : 0
Data Blocks Received : 0
Receive Block Errors : 0
Voice/Fax Blocks Transmitted : 0
Voice/Fax Blocks Received : 0
Link Alarms : 0
Remote Downs : 0

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Содержание DataTalker DT101

Страница 1: ...Data Voice Fax Concentrator Desktop Models DT101 DT102 DT101 xx DT102 xx Rack Mount Models DT101R DT102R DT101R xx DT102R xx Owner s Manual...

Страница 2: ...t hereof without obligation of Multi Tech Systems Inc to notify any person or organization of such revisions or changes Record of Revisions Revision Description E Manual revised to incorporate minor e...

Страница 3: ...nnel 17 1 7 9 Electrical Physical 18 Chapter 2 Configuration 2 1 Introduction 20 2 2 Configuration 1 Dial Up Link 21 2 3 Configuration 2 MMH900 Series with Voice Fax 25 2 4 Configuration 3 LAN to LAN...

Страница 4: ...6 5 1 Loop Tests 80 6 6 Configure Remote Unit 81 6 6 1 MMV8 16 32 Configuration Options 81 6 6 2 Quick Setup 82 Chapter 7 Troubleshooting 7 1 Introduction 88 7 2 Importance of the Composite Link Stati...

Страница 5: ...nversion Chart 118 Appendix B RS 232C Interface Specification 119 Appendix C Cabling Diagrams 120 Appendix D Flow Control Background 124 Appendix E MMH2834 Modem S Registers 125 Appendix F MMH2834 Mod...

Страница 6: ......

Страница 7: ...Chapter 1 Introduction and Description...

Страница 8: ...ATA COMMAND ORIG 101 MDM TA RXT FCR RD TM V35 EXT MDM DSU CD RCV XMT CTS 56 RTS NS OOS 28 8 OH DBUP TA DTR 2B FXS FXO E M FAX XMT RCV XSG RSG COM XMT RCV FC VOICE FAX 2 RSG XSG RCV XMT FAX E M FXO FXS...

Страница 9: ...detail If a V 35 interface is used a procedure on how to move the shunt is provided Finally a power on and checkout procedure is provided with some suggestions on what to do in case something goes wro...

Страница 10: ...s Composite Link 2 3 1 4 5 6 7 9 8 Fax Telephone E M Trunk Trunk Station Trunk Station PBX PSTN RAM EPROM Digital Signal Processor Channel 1 CODEC A to D D to A Modem DSU or Terminal Adapter L i n k C...

Страница 11: ...The E M connector is used to link two PBXs Before a voice or fax operation can take place the DataTalker must be configured for the types of local and remote connections and for the line conditioning...

Страница 12: ...chronous and full duplex communications with an internal or external link device Using an internal modem ISDN terminal adapter DSU or external device the DataTalker can be connected to different types...

Страница 13: ...fax channel composite link and various components of the DataTalker unit itself The diagnostic tests are executed from a single diagnostic tests menu by selecting the test number and following any co...

Страница 14: ...C if you believe it is necessary 5 The telephone company may make changes in its facilities equipment operations or procedures that could affect the operation of the equipment If this happens the tele...

Страница 15: ...Repairs to certified equipment should be made by an authorized Canadian facility designated by the Supplier Any repairs or alterations made by the user to this equipment or equipment malfunctions may...

Страница 16: ...check with ARQ Interface RS 232D ITU T V 24 DB 25 female connector 1 7 3 System Control Command Port Local Access Through DataTalker s RS232C command port Device Any asynchronous keyboard terminal or...

Страница 17: ...ith an RJ 48 keyed jack 1 7 7 ISDN Terminal Adapter Description Integral ISDN terminal adapter card Operating Mode ISDN Basic Rate 1B D or 2B D Synchronous Data Rates 2 4 128 Kbps Clocking Normal netw...

Страница 18: ...Power Consumption 20 watts Dimensions 2 3 high x 9 wide x 12 8 deep 5 7 cm high x 22 9 cm wide x 32 7 cm deep Weight 7 pounds 3 2 kg Rack mount Models Power Supply Input 100 to 250 VAC Frequency 47 t...

Страница 19: ...Chapter 2 Configuration...

Страница 20: ...minal adapter DataTalker Configurations Desktop Models Base Model with 1 Data Channel 1 Voice Fax Channel 1 Data Channel 2 Voice Fax Channels No Additional Options Installed DT101 DT102 33 6K bps Mode...

Страница 21: ...line You must also connect a terminal or a PC running communications software such as Multi Tech s MultiExpress for DOS to the dual function data command port and configure the DataTalkers Configure t...

Страница 22: ...revious Menu Selection _ For the main office and the home office units let s use the default data port configuration If your specific configuration requires that the data port be set up differently se...

Страница 23: ...ialing To set up for DTR dialing select option 1 Enter AT Commands to 2834 and enter the following AT commands ATDT Number to Dial N0 CR AT D1 CR AT W CR Q CR ATDT Number to Dial N0 is the AT command...

Страница 24: ...r on the home office DataTalker the internal MMH2834 modem dials the previously stored number for the main office The OH Off Hook LED lights indicating that the modem is active After the main office D...

Страница 25: ...T M V 2 9 V 3 3 M o d e m C D R C V X M T C T S External Composite Link Channel Two Channel Three Channel Four Command Modem Channel Five Channel Six Channel Seven Channel Eight XMT RCV XMT RCV XMT RC...

Страница 26: ...hannel s or the composite link This menu also allows you to select various factory defaults and store your current configuration Configurations 1 Data Port Configuration 2 Voice Fax Channel s Configur...

Страница 27: ...second choice in the Configurations menu Voice Fax Channels Configuration At the Configurations menu enter 3 and press ENTER to display the Composite Link Settings menu The DataTalker detects the typ...

Страница 28: ...ORIG 101 MDM TA RXT FCR RD TM V35 EXT MDM DSU CD RCV XMT CTS 56 RTS NS OOS 28 8 OH DBUP TA DTR 2B FXS FXO E M FAX XMT RCV XSG RSG COM XMT RCV FC VOICE FAX 2 RSG XSG RCV XMT FAX E M FXO FXS Data Voice...

Страница 29: ...enu is displayed Data Port Configuration 1 Async Sync Async 2 Speed 19200 3 Word Length 8 4 Stop Bits 1 5 Parity None 6 Flow Control CTS 7 Enq Ack Flow Control Off 8 Echo Off 9 Pacing Off 10 EIA Pass...

Страница 30: ...e remote interface For the other selections accept the defaults Voice Fax Channel 1 Configuration 1 Destination Channel 1 2 Digitizing Rate 9600 3 Output Level Atten 12 4 Input Level Gain 03 5 Silence...

Страница 31: ...store all configurations If you are setting up the composite link for an external composite link device set up the device for internal clocking and the type of connection between the device and the Da...

Страница 32: ...the local and the remote sites connect the DATA COMMAND connector on the DataTalker to an asynchronous port on the computer connect the DSU TA DIGITAL jack on the DataTalker to the jack for the ISDN s...

Страница 33: ...both DataTalkers change the local interface type option 6 and the remote interface type option 11 to E M For the other selections accept the defaults Voice Fax Channel 1 Configuration 1 Destination C...

Страница 34: ...cess the terminal adapter s built in configuration menus refer to the ISDN Terminal Adapter Owner s Manual for details The Flush Time option is used only with an Alpha microcomputer or Wyse terminal E...

Страница 35: ...Chapter 3 Front and Rear Panel Descriptions...

Страница 36: ...ion and function is the same on each Table 3 1 explains the function of each indicator by group COMPOSITE LINK STATUS VOICE FAX 1 DATA COMMAND ORIG 101 MDM TA RXT FCR RD TM V35 EXT MDM DSU CD RCV XMT...

Страница 37: ...r s buffers are full and the local DataTalker has been told to stop sending data This indicator lights for both internal and external link devices RD Remote Down This indicator lights when the local D...

Страница 38: ...indicator when an internal modem or an ISDN terminal adapter is the composite link device NS DBUP No Signal Dial Backup This dual function indicator functions as a No Signal NS indicator when a DSU i...

Страница 39: ...channel device such as a terminal PC or router or to configure the DataTalker in command mode The data channel device can be synchronous or asynchronous In command mode an ASCII terminal or a PC with...

Страница 40: ...to connect the DataTalker to a DDS or dedicated network line when an internal DSU is installed or to an ISDN line when the ISDN terminal adapter is installed The connector is an RJ 48 jack 3 3 9 MODE...

Страница 41: ...DataTalker Listen for the dialed modem s answer tone When you hear it press and release the Originate switch Replace the telephone handset in its cradle and your data communications can begin 101 MDM...

Страница 42: ...lker Position 6 Not used Position 7 Not used Position 8 Not used 3 4 4 RS232C V 35 Shunt You can connect an external composite link device using either an RS232 V 24 or a V 35 interface to the DataTal...

Страница 43: ...Chapter 4 Unpacking and Configuration...

Страница 44: ...ing the cables and the Owner s Manual Additional manuals may be included for options such as an internal link device Inspect the contents for signs of any shipping damage If damage is observed do not...

Страница 45: ...yourself is what the port is connected to e g an async channel of a host computer a LAN gateway or bridge or the composite link of an MMH900 series MultiMux If the port is connected to an asynchronou...

Страница 46: ...tion 11 you are not setting the remote interface You must know how the remote DataTalker is being used You may need to call the remote site to determine this If the local voice fax channel is connecte...

Страница 47: ...te If an internal DSU is the composite link device consider the following questions Is a DDS line being used If yes use the default configuration Is the speed of the line 56K bps If yes use the defaul...

Страница 48: ...nications software to the DATA COMMAND connector on the back panel of the DataTalker Use an appropriate RS232 cable to connect the DATA COMMAND connector to your PC s serial port The terminal or PC se...

Страница 49: ...async and the channel speed is 19 2K bps you can use the data port configuration defaults to start Proceed to the voice fax channel configuration step 11 If the data channel speed is higher or lower t...

Страница 50: ...ng connected to telephone sets i e both local and remote interfaces are FXS type then you can skip the Voice Fax Channel Configuration menu Proceed to the Composite Link Configuration menu If either t...

Страница 51: ...enu If the composite link device is an internal MMH2834 modem the Internal MMH2834 Modem Settings menu appears Verify the configuration of the internal MMH2834 modem If the composite link has an inter...

Страница 52: ...you have set all the options for the port and modem enter S and press ENTER to store all configurations Then enter P and press ENTER to return to the Composite Link Configuration menu 16 If the compo...

Страница 53: ...e r n a l D e v i c e 1 On Line XMT Rate 56000 2 Clocking External 3 Back to Back Off 4 DOD DOI On 5 DOI Timer 03min 6 DOD Toggle DTR 40sec S Store All Configurations M Main Menu P Previous Menu Sele...

Страница 54: ...54 DataTalker Owner s Manual...

Страница 55: ...Chapter 5 Installation...

Страница 56: ...owing cabling procedures relate the cables to the configuration Table 5 1 Cabling Procedure Step Procedure Composite Link 1 Verify that DIP switch position 2 is set for the composite link device being...

Страница 57: ...r from the internal DSU TA DIGITAL connector on the back panel to the digital line connector MODEM DSU TA DIAL UP LEASED DIGITAL VOICE FAX CHANNEL 1 FXO FXS EXTERNAL COMPOSITE DATA COMMAND RS232C V 35...

Страница 58: ...rocedure on how to move the shunt Data Channel 4 If you are connecting the data channel to an asynchronous device such as a PC or other type of host connect an RS232C cable from the DATA COMMAND conne...

Страница 59: ...fax channel to a PBX E M trunk connect an RJ 48 phone cable from the VOICE FAX CHANNEL 1 E M connector on the DataTalker to an E M trunk connector on the PBX Voice Fax Channel 2 does not have an E M...

Страница 60: ...g Screws 3 Desktop version only Turn the cabinet right side up tilt the back down slightly and the base unit will slide out of the cabinet 4 Desktop and rack versions Place the unit with the LEDs faci...

Страница 61: ...L 1 FXO FXS EXTERNAL COMPOSITE DATA COMMAND RS232C V 35 E M INTERNAL COMPOSITE POWER GND Power Switch Figure 5 13 Power Switch Desktop Version 3 Verify the states of the following composite link LEDs...

Страница 62: ...ffice phone ring if it is a dial up situation they must dial the main office number to make its phone ring 8 If the above functional tests do not all work you must conduct further tests Analyze the fa...

Страница 63: ...n and cabling match The remote DataTalker does not match the remote interface type See Chapter 4 The telephone or fax machine is connected to the wrong connector Verify the cable connection The teleph...

Страница 64: ...64 DataTalker Owner s Manual...

Страница 65: ...Chapter 6 Menus...

Страница 66: ...onfigurations menu you can configure the data port voice fax channel s or composite link display factory defaults store all current configurations or return to the Main Menu Configurations 1 Data Port...

Страница 67: ...ed is 19 2k bps The Word Length option sets the number of bits in a word The word length range is 5 to 8 bits The default is 8 bits The Stop Bits option sets the number of stop bits The number of stop...

Страница 68: ...through the DataTalker This option only applies during the async mode of operation Since in normal interactive operation the existence of a DataTalker should be transparent to the user the EIA pass t...

Страница 69: ...e Condition option must be set to match the idle condition of the synchronous device connected to the data port The idle condition must set when the synchronous data line is in an idle condition i e n...

Страница 70: ...conditions Voice Fax Channel 1 Configuration 1 Destination Channel 1 2 Digitizing Rate 9600 3 Output Level Atten 12 4 Input Level Gain 03 5 Silence Suppression Off 6 Local Interface Type FXS 7 Ground...

Страница 71: ...ume level heard on the remote DataTalker will change accordingly The input level gain needs to be set on the transmitting DataTalker talking This will increase the volume that the person at the receiv...

Страница 72: ...e is from 100 to 350 milliseconds The default delay is 250 ms The Remote Interface Type option informs the local voice fax channel of how the remote channel may be configured The options are for an FX...

Страница 73: ...the modem See Appendix F Composite Link Settings Internal MMH2834 1 Enter AT commands to 2834 2 On Line XMT Rate 28800 3 Speed Setting 33600 4 Dial Leased Dial 5 2 or 4 Wire 2 Wire 6 Answer Originate...

Страница 74: ...l On Demand DOD Disconnect On Inactivity DOI option drops DTR to the MMH2834 modem to disconnect if the inactivity timer has expired and raises DTR to reconnect if the voice fax or data channel goes a...

Страница 75: ...Settings Internal TA menu allows you to configure the composite link for an ISDN terminal adapter using the terminal adapter s built in configuration menu Composite Link Settings Internal TA 1 On Line...

Страница 76: ...ion is selected a submenu is displayed in which you can enter the number of minutes that the inactivity timer is set for The range of the timer in minutes is 01 to 99 The default setting for the timer...

Страница 77: ...l device to disconnect if the inactivity timer has expired and raises DTR to reconnect if the voice fax or data channel goies active The default is to have the DOD DOI option turned off If this option...

Страница 78: ...ved 0 Receive Block Errors 0 Voice Fax Blocks Transmitted 0 Voice Fax Blocks Received 0 Link Alarms 0 Remote Downs 0 Comparing the number of blocks transmitted with the number of retransmits needed to...

Страница 79: ...es a submenu that allows either a data loopback function or voice loopback function Tests for the ISDN terminal adapter are described in the ISDN Terminal Adapter Owner s Manual Diagnostics 1 Loop Tes...

Страница 80: ...nd the test While the test is running speak into the mouthpiece of the telephone connected to the DataTalker If you hear your voice over the speaker the circuit is okay Internal DSU Test Your internal...

Страница 81: ...ous Menu Selection _ When the composite link is established with the remote unit option 5 is selected and async mode is enabled the remote unit s Main menu appears on the local unit s monitor All menu...

Страница 82: ...Setup option Option 6 in the main menu allows you to configure your DataTalker by answering a few questions and then following a set of installation instructions The following description Warning The...

Страница 83: ...ata Talker MMH2834 Modem Dial up MODEM DSU TA DIAL UP LEASED DIGITAL VOICE FAX CHANNEL 1 FXO FXS EXTERNAL COMPOSITE DATA COMMAND RS232C V 35 E M INTERNAL COMPOSITE POWER GND Internal Modem DIAL UP Con...

Страница 84: ...L VOICE FAX CHANNEL 1 FXO FXS EXTERNAL COMPOSITE DATA COMMAND RS232C V 35 E M INTERNAL COMPOSITE POWER GND DATA COMMAND Connector RS232 Cable Configuration and installation is complete To view or chan...

Страница 85: ...the Data Talker MMH2834 Modem Dial up MODEM DSU TA DIAL UP LEASED DIGITAL VOICE FAX CHANNEL 1 FXO FXS EXTERNAL COMPOSITE DATA COMMAND RS232C V 35 E M INTERNAL COMPOSITE POWER GND Internal Modem DIAL U...

Страница 86: ...OSITE DATA COMMAND RS232C V 35 E M INTERNAL COMPOSITE POWER GND DATA COMMAND Connector RS232 Cable Configuration and installation is complete To connect to the main office turn the Data Talker off and...

Страница 87: ...Chapter 7 Troubleshooting...

Страница 88: ...Statistics Elasped Time 00 Days 00 Hours 00 Minutes Data Blocks Transmitted 0 Data Blocks Retransmitted 0 Data Blocks Received 0 Receive Block Errors 0 Voice Fax Blocks Transmitted 0 Voice Fax Blocks...

Страница 89: ...rnal MMH2834 modem back to back use the RJ 11 back to back cable and configure both modems for 4 wire leased line operation Configure one modem for originate and the other modem for answer Set the spe...

Страница 90: ...a cookbook and you must use your best judgement For purposes of troubleshooting you can divide your mux network into three main parts Data Channel Sync async channel device printer terminal PC etc Ch...

Страница 91: ...able connections between command port device and Command port on DataTalker for correct cable wiring see cabling diagrams in Appendix C 3 Call Tech Support for assistance see Chapter 8 Table 7 2 Compo...

Страница 92: ...n 1 Verify DSU configuration See Composite Link settings Inernal DSU in Table 7 5 2 Call Tech Support for assistance see Chapter 8 1 View composite link statistics refer to Table 7 10 2 Perform compos...

Страница 93: ...or 3 Verify ISDN configuration See Composite Link Settings Internal ISDN in Tabe 7 6 4 Call Tech Support for assistance see Chapter 8 1 Call phone company and verify communication line 2 Call Tech Sup...

Страница 94: ...Modem Dial up or Leased connector 3 Verify modem configuration see Composite Link Settings Internal MMH2834 in Table 7 7 4 Perform Local Analog Loopback test see Appendix G Testing your MMH2834 5 Cal...

Страница 95: ...s in the Closed down position 2 Verify that calbe is connected to External Composite RS232C V 35 connector 3 Verify composite link configuration see Composite Link Settings External Device in Table 7...

Страница 96: ...0 2 Call Tech Support for assistance see Chapter 8 1 See cabling diagrams in Appendix B and C on both DataTalker and data channel device 2 Call Tech Support for assistance see Chapter 8 1 Verify flow...

Страница 97: ...voice fax channel a couple db and recheck voice quality see Table 7 11 1 Decrease output level attentuation setting on local voice fax channel a couple of db and recheck voice quality see Table 7 11 1...

Страница 98: ...different from remote interface type Composite link down Phone cord for the voice or fax machine is connected to the wrong interface connector Solution 1 Contact the remote site to verify its local in...

Страница 99: ...is displayed Configurations 1 Data Port Configuration 2 Voice Fax Channel s Configuration 3 Composite Link Configuration 4 Factory Default Configuration Options 5 Configure Remote Unit S Store All Co...

Страница 100: ...ite Link Configuration 4 Factory Default Configuration Options 5 Configure Remote Unit S Store All Configurations M Main Menu P Previous Menu Selection _ 6 Enter 3 and press ENTER to display the Compo...

Страница 101: ...rt Configuration 2 Voice Fax Channel s Configuration 3 Composite Link Configuration 4 Factory Default Configuration Options 5 Configure Remote Unit S Store All Configurations M Main Menu P Previous Me...

Страница 102: ...gurations 1 Data Port Configuration 2 Voice Fax Channel s Configuration 3 Composite Link Configuration 4 Factory Default Configuration Options 5 Configure Remote Unit S Store All Configurations M Main...

Страница 103: ...rminal mode and press ENTER twice to establish communications with the DataTalker The Main Menu appears Main Menu 1 Configurations 2 Statistics 3 Reset Options 4 Diagnostics 5 Exit Command Mode 6 QUIC...

Страница 104: ...the link You will find that the Link Alarms numbers will correspond to the Data Blocks Retransmitted and Receive Block Errors numbers Specifically a Link Alarm means that it has been 10 seconds since...

Страница 105: ...ker The Main Menu appears Main Menu 1 Configurations 2 Statistics 3 Reset Options 4 Diagnostics 5 Exit Command Mode 6 QUICK SETUP Selection _ 5 Enter 1 and press ENTER The Configurations menu is displ...

Страница 106: ...f S Store All Configuations M Main Menu P Previous Menu Selection _ If the data port is set up as a synchronous data channel the sync parameters are displayed 8 When you have verified or set all optio...

Страница 107: ...rs Main Menu 1 Configurations 2 Statistics 3 Reset Options 4 Diagnostics 5 Exit Command Mode 6 QUICK SETUP Selection _ 5 Enter 1 and press ENTER The Configurations menu is displayed Configurations 1 D...

Страница 108: ...propriate option numbers Options 1 through 10 are for the local interface Options 11 through 14 are for the remote interface Note that the remote interface options do not actually change the remote in...

Страница 109: ...o the terminal or PC Run the PC s communications software in terminal mode and press ENTER twice to establish communications with the DataTalker The Main Menu appears Main Menu 1 Configurations 2 Stat...

Страница 110: ...110 DataTalker Owner s Manual...

Страница 111: ...Chapter 8 Warranty Service and Tech Support...

Страница 112: ...IES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED This warranty does not apply to any products which have been damaged by lightning storms water or power surges or whic...

Страница 113: ...messages diagnostic test results DIP switch settings problems with a specific application etc 8 3 2 Service If your tech support specialist decides that service is required your DataTalker may be sen...

Страница 114: ...the Main Menu type F to access the Files Menu then type D 2 Enter the name of the file you wish to download from the BBS 3 If a password is required enter the password 4 Answer Y or N to the automati...

Страница 115: ...ey initiates the download 8 When the download is complete press ENTER to return to the File Menu 9 To exit the BBS type G and press ENTER 8 5 About the Internet Multi Tech is a commercial user on the...

Страница 116: ...116 DataTalker Owner s Manual...

Страница 117: ...Appendixes...

Страница 118: ...s 73 115 T DC4 14 20 4 34 52 T 54 84 t 74 116 U NAK 15 21 5 35 53 U 55 85 u 75 117 V SYN 16 22 6 36 54 V 56 86 v 76 118 W ETB 17 23 7 37 55 W 57 87 w 77 119 X CAN 18 24 8 38 56 X 58 88 x 78 120 Y EM...

Страница 119: ...ent have DC resistances of 4 7K For more specific details consult the EIA RS232C standard itself The following chart lists the EIA RS232C interface pins and circuits present on the DataTalker s RS232C...

Страница 120: ...Channel cabling PIN NO 1 2 3 4 5 6 7 8 20 22 25 1 2 3 4 5 6 7 8 20 22 25 To DTE Device Data Terminal Equipment i e Computer Terminal CHASSIS GROUND AA TRANSMIT DATA BA RECEIVE DATA BB REQUEST TO SEND...

Страница 121: ...A CARRIER DETECT DATA TERMINAL READY TRANSMIT DATA A RECEIVE DATA A TRANSMIT DATA B RECEIVE DATA B EXTERNAL TX CLOCK A RECEIVE CLOCK A EXTERNAL TX CLOCK B RECEIVE CLOCK B TRANSMIT CLOCK A TRANSMIT CLO...

Страница 122: ...CONNECTOR 1 2 3 4 5 7 6 8 15 17 20 24 1 3 2 5 4 7 20 24 6 8 15 17 Frame Ground Transmit Data Receive Data Request To Send Clear To Send Signal Ground Data Set Ready Carrier Detect Transmit Clock Rece...

Страница 123: ...45 Spade Lug Wire Color Function 1 M Green White Input 2 E White Green Output 3 T1 White Orange 4 Wire Output 4 R White Blue 4 Wire Input 2 Wire 5 T Blue White 4 Wire Input 2 Wire 6 R1 Orange White 4...

Страница 124: ...t as the DataTalker can send it or which may need to go off line when it runs out of paper To state it simply flow control is something the DataTalker does to the channel device while pacing is someth...

Страница 125: ...the first ring The maximum number of rings that can be configured is 255 Setting the value to zero 0 disables auto answer completely S6 Wait Time for Dial Tone Unit 1 second Range 2 255 4 255 4 7 Def...

Страница 126: ...emote configuration character by its decimal ASCII code The default is three percent symbols When the S13 character is entered three consecutive times from a remotely connected site your modem respond...

Страница 127: ...F 3 Automatic Pauses in dialing Y Long Space Disconnect W Wait for New Dial Tone R Reverse Mode of Operation Flash On Hook AT T Calling Card Tones Quiet Answer Memorize Phone D N Store Phone Numbers...

Страница 128: ...ize Block Size E14 Data Compression Disabled Section F 10 E15 Data Compression Enabled Configure Speed BA0 Speed Conversion On Conversion BA1 Speed Conversion Off Section F 11 MB Set modem speed e g M...

Страница 129: ...o hit RETURN and the modem will redial the number for you If you again reach a busy signal it redials again and again until it no longer detects a busy signaF You can stop the MMH2834 from redialing b...

Страница 130: ...pausing for a second dial tone The number would be dialed by entering ATDP9 T5551212 and RETURN The comma causes a pause which we ll explain soon Set Pulse Dial Ratios P This command sets the time ra...

Страница 131: ...to extension 5678 you might enter ATDT5551234 5678 The commas cause a 4 second pause just to be safe Calling Card Detect Tones The MMH2834 has the capability to detect AT T calling card tones for the...

Страница 132: ...another number automatically if the first number dialed is bysy This would be useful in a situation where a computer can be accessed through more than one phone number This is called linking To link t...

Страница 133: ...turn the F command to read factory installed defaults enter F8 W0 F8 is the factory default Many datacomm programs including MultiExpressTM and MultiExpress for WindowsTM issue the F command automatic...

Страница 134: ...ay want the answer mode handled without responses and echo turned off but want the originate mode still intelligent This is called the No Response Answer mode ATQ2 selects the No Response Answer mode...

Страница 135: ...xtended and Call Progress Selection X The X Command is used to select one of two possible dialing methods dumb or smart and to select various response combinations related to these methods You can cho...

Страница 136: ...y signal detection capability is also activated The X command is also used to select which dialing method is used Five different X commands are available X0 through X4 with five different effects on t...

Страница 137: ...r and a timer If three retrains occur within a two minute period the modem falls back to 4800 bps Entering AT F0 or AT F allows no fallback when on line AT F1 allows the MMH2834 to fallback based on t...

Страница 138: ...ccepts MNP or LAP M The L2 command sets your modem to LAP M error correction and disables MNP This command is for Originate mode only Answer mode still accepts MNP or LAP M In the prior commands the m...

Страница 139: ...Fall back to Normal mode if CARRIAGE RETURN received The factory default is F0 Retransmit Count R Retransmit Count If errors are received during a Reliable connection the modem re sends the block of d...

Страница 140: ...NP 4 and 5 typically send blocks of 1 to 256 characters and LAP M typically sends 128 characters For MNP classes 4 and 5 LAP M reducing the block size to 64 characters may give a smoother flow of data...

Страница 141: ...d AT BA0 To turn Speed Conversion OFF enter AT BA1 and hit RETURN The modem will now match its RS232C speed to that of the computer and will adjust its speed to any changes in the computer s speed in...

Страница 142: ...with a convenient way to switch the serial port speed and still make it easy to go back to the original speed automatically the next time the modem is powered up or reset with an ATZ command The comm...

Страница 143: ...the modem with which they are communicating by using the I command This read command lets the software to determine the type of modem with which it is communicating When ATI or ATI0 is entered the MMH...

Страница 144: ...then type ATL8 What then displays on your monitor is your modem s current on line condition e g Link Type Line Speed Serial Speed Type of Error Correction Data Compression Number of past Retrains etc...

Страница 145: ...ation ANSI character set An 8 bit character set that contains 256 characters The first 128 characters are alphanumeric punctuation and the second 128 contain math and foreign language symbols ASCII Am...

Страница 146: ...for useful information By knowing the original characteristics a receiver can interpret any changes as modulations and thereby recover the information CCITT Consultative Committee for International T...

Страница 147: ...chTone DTR Data Terminal Ready An RS232 signal sent from the computer or terminal to the modem indicating that it is able to accept data E EBCDIC Extended Binary Coded Decimal Interexchange Code prono...

Страница 148: ...represent binary values Hex uses the numbers 0 9 and the letters A F usually notated by an h e g 4CF h read four charley fox hex The result is that one hex digit represents a 4 bit value Host The com...

Страница 149: ...of encoding information from one signal called the source into another called the carrier by modifying some characteristic s of the carrier It is often used in telecommunications when one type of sig...

Страница 150: ...ets rather than being packaged in its own enclosure Rackmounting conserves disk or floor space real estate and often conserves power outlets RAM Random Access Memory pronounced ram A computer s primar...

Страница 151: ...trips the start and stop bits appended to each character UTP unshielded twisted pair Telephone type wiring V V 21 The ITU T modulation standard for 300 bps full duplex transmission over dial up lines...

Страница 152: ...line conditioning commands 137 phone number memory commands 132 pulse dial P 130 pulse dial ratios P 130 response commands 134 result codes basic extended X 135 retransmit count R 139 speed conversio...

Страница 153: ...100 specifications 17 L LAN router 10 LAN to LAN configuration 28 Leased line restoral parameter 126 LED indicators 36 61 Load number 15 Loading Factory Defaults F 133 Local Interface Type option 72...

Страница 154: ...M TA 41 DIP 42 56 79 frame compatibility 42 Originate 41 power 41 Reset 41 Sync data channel 16 Synchronous Communications 8 T Technical support 113 Test cables 89 Tests 61 79 80 109 back to back 89 i...

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