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Operation

Security Overview

3-20

SpectraComm Dual V.34 Modem

060R122-000

Installation and Operation

Issue 15

Message Flow

The Secure Access Modem is connected to a PSTN by voice-band modems. The Authentication 
Server is connected to the PSTN via a modem bank, allowing access to the server by multiple users. 
A secondary Authentication Server minimizes delay and avoids downtime. The message flow 
between components in a Secure Access Controller system is detailed below.

Figure 3-1

SAM Authentication Sequence

Background Communication

1. The Secure Access Modem (SAM) obtains a new private key from the Authentication Server 

(AS) via a secure tunnel at every power-up, key time-out or session end.

First Call

2. Remote user's client software calls the Authentication Server (AS) and is identified via 

encrypted communication over a secure tunnel. In the event of a hacker attempt, a secure 
tunnel is never established. When the caller is authenticated, the Authentication Server sends 
the client the SAM phone number and its public key over the secure tunnel. AS then 
disconnects the call.

Second Call

3. Client calls the SAM and performs a public key exchange over a secure tunnel. 

Authenticated Out-of-Band Management Access

4. User manages protected network equipment via the secure tunnel and AES data encryption:

•

Client sends AES encrypted data to SAM;

•

SAM decrypts data and sends it to the 
protected network equipment;

•

The protected equipment sends data to SAM;

•

SAM encrypts data and sends data to client;

•

Client decrypts data and displays it to user;

Note

When the user terminates the management session, that public key is no longer valid.

MODEM

CICSO 2611

to SWITCH

SECONDARY

AUTHENTICATION

SERVER

MODEM BANK

REMOTE USER

CLIENT

Secondary  Authentication Server Site

PRIMARY

AUTHENTICATION

SERVER

MODEM BANK

Primary  Authentication Server Site

PSTN

REMOTE

MANAGEMENT

of SAM

Modem
connects
secure call 
to Switch

4

Secure
connection
to Server

2

SAM

MODEM

Modem calls
Server for 
New Key

1

3

3

Remote User Modem 
calls SAM Modem

MODEM

SAM

MODEM

Protected
Equipment

Remote

User

Decrypted

Data

Encrypted

Data

Decrypted

Data

Encrypted
Data

Содержание 060A027-001

Страница 1: ...The Best Connections in the Business General DataComm 6SHFWUD RPP V 34 Dual Modem Installation Operation Manual 060R122 000 Issue 15 May 2012...

Страница 2: ...on 6 0 0 In addition to the publications listed above always read Release Notes supplied with your products Issue Number Date Description of Change 1 4 Initial Release and Updates 5 November 1999 Revi...

Страница 3: ...ist 1 8 Technical Specifications 1 10 Chapter 2 Installation Unpacking the Modem 2 1 Installation Guidelines 2 1 Setting Option Jumpers 2 2 Installing the Dual V 34 Modem 2 4 Making Cable Connections...

Страница 4: ...3 32 Direct Dialing in Synchronous Mode 3 32 Normal Synchronous Mode 3 32 V 13 Synchronous Mode 3 33 Synchronous Compression Mode 3 33 Clock Selection 3 34 Switched Network Operation 3 35 Telephone Li...

Страница 5: ...25 bis Communication Commands 5 7 ITU T V 25 bis Command Procedures 5 9 108 2 Mode Operating Procedures 5 9 108 1 Mode Operating Procedures 5 11 V 25 bis 108 2 Mode Interface Specifications 5 12 Inter...

Страница 6: ...iv SpectraComm Dual V 34 Modem 060R122 000 Installation and Operation Issue 15 Table of Contents...

Страница 7: ...y not be current Contact General DataComm if you require updated information for this or other General DataComm products General DataComm Inc 6 Rubber Avenue Naugatuck Connecticut USA 06770 Tel 1 203...

Страница 8: ...etwork interface Never install telephone wiring during an electrical storm Antistatic Precautions This product may contain static sensitive devices that are easily damaged by electrostatic discharge E...

Страница 9: ...If the SpectraComm Dual V 34 causes harm to the telephone network the telephone company will notify you in advance that temporary discontinuance of service may be required If advance notice is not pra...

Страница 10: ...ment Technical Requirements document s The Department does not guarantee the equipment will operate to the user s satisfaction Before installing this equipment users should ensure that it is permissib...

Страница 11: ...de t l communications peut demander l utilisateur de d brancher un appareil la suite de r parations ou de modifications effectu es par l utilisateur ou cause de mauvais fonctionnement Pour sa propre p...

Страница 12: ...6 Rubber Avenue Naugatuck CT 06770 U S A Declare under our sole responsibility that the SpectraComm Dual V 34 modem is in conformity with the following standards or other normative documents EN 55022...

Страница 13: ...ct Support Repair GDC provides regular and warranty repair services through Factory Direct Support Repair at its U S headquarters in Naugatuck Connecticut This customer support organization repairs an...

Страница 14: ...Preface Support Services and Training xii SpectraComm Dual V 34 Modem 060R122 000 Installation and Operation Issue 15...

Страница 15: ...n a dual shelf configuration allowing for one SCM card The SpectraComm 2000 Shelf holds two cards and can be rack mounted or wall mounted and supports central and remote site installation For non NEBS...

Страница 16: ...te determination in V 34 and V 32 bis modes with fallforward fallback V 42 MNP error control V 42 bis MNP 5 asynchronous data compression Supports MNP 10 for cellular phones Synchronous data compressi...

Страница 17: ...s are often used to communicate with main frame or mini computers and usually do not support disk management or file transfers A full featured data communications software package does allow file tran...

Страница 18: ...enclosure system refer to its manual as listed on the inside cover of this manual Figure 1 1 Shelf Enclosure Configurations GPS 11E POWER SUPPLY POWER ON FAIL POWER ON OFF 0 GPS 11E POWER SUPPLY POWE...

Страница 19: ...ial connections to the network In a RADIUS protected system dial in users will be authenticated through user names passwords and challenged prompts coming from the modem and through the SCM to a RADIU...

Страница 20: ...er s client software Each connection sets up a secure tunnel that passes AES encrypted data to the authorized user When a user terminates a management session the Secure Access Modem requests a connec...

Страница 21: ...m products prod_homo shtml Country codes listed as 999 default indicate no dialing parameters Modems with SAM or AES Encryption are for USA or Canada only Code 001 Table 1 1 Supported Country Codes Co...

Страница 22: ...2 Includes Online and SteadFast Security 060M027 002 SC Dual V 34 Modem in the RA 1000 AC Standalone Enclosure two mod to mod cables 830 027 414 Cable Splitter Adapter 010P165 002 060A027 001 SC Dual...

Страница 23: ...slot dual RJ45 Zone 1 connector panels 010M070 001 MS 2 Model 10 48 VDC with redundant power supplies and term block kit two 8 slot dual RJ45 Zone 1 connector panels 010M210 002 MS 2 Model 11 48 VDC...

Страница 24: ...T V 34 or V 32 7200 bps ITU T V 34 or V 32 bis 4800 bps ITU T V 34 or V 32 2400 bps ITU T V 34 or V 22 bis 1200 bps ITU T V 22 or Bell 212A 300 bps ITU T V 21 or Bell 212 Asynchronous only Data Forma...

Страница 25: ...0 Hz 0 5 Hz ITU T V 21 Originate Mode Answer Mode Mark 1850 12 Hz Space 1650 12 Hz Mark 1180 Hz 12 Hz Space 980 Hz 12 Hz Bell 103 Originate Mode Answer Mode Mark 2225 Hz 12 Hz Space 2025 Hz 12 Hz Mark...

Страница 26: ...ECT delay Power Reqmts Power Consumption 6 watts dc maximum each DC Voltage Typical 5V 12V 12V 5V 5 at 0 85A 12V 5 at 0 04A 12V 5 at 0 015A Load Number 1 0 Dimensions Printed circuit board Height 21 m...

Страница 27: ...eed environmental specifications Table 1 3 Do not install the unit directly above equipment that generates a large amount of heat such as power supplies If the Zone 1 connector panel of the shelf has...

Страница 28: ...ommunicate on a switched network telephone line The Default position for X3 and X4 is for switched network communication When the modem is installed in the SC 5000 high density shelf positioning the j...

Страница 29: ...PER LOCATION SHELF BACKPLANE TYPES J32 J48 J31 J47 J30 J46 J29 J45 J28 J44 J27 J43 J26 J42 J25 J41 J24 J40 J23 J39 J22 J38 J21 J37 J20 J36 J19 J35 J18 J34 J17 J33 J14 J12 J11 J16 J15 J13 J10 J9 J8 J7...

Страница 30: ...then use the tab to remove card Making Cable Connections Figure 2 2 shows the cabling of a typical network installation when the Dual V 34 is housed in SpectraComm shelves and enclosures Table 2 1 li...

Страница 31: ...NE STANDARD BACKPLANE ZONE 1 F G G F G F D DTE INTFC 2 HEX STANDOFF BACK PANEL BACKPLANE CONNECTOR ATTACHING BAND SCREW one for each cable hood 50 PIN CABLE SC 5000 SHELF SC 2000 SHELF J32 J48 J31 J47...

Страница 32: ...ved Clock 20 CD 108 2 DTR To DCE Data Terminal Ready 22 CE 125 RI From DCE Ring Indicator 24 DA 113 TC To DCE Transmit Clock DTE Source Table 2 3 Interface Connector Cable Splitter to Backplane Pin No...

Страница 33: ...d for each range of data rates using an example calculation Resistance and Cable Length A DTE cable for use with the modem must have total resistance of 20 ohms or less To calculate a cable s resistan...

Страница 34: ...If you are using a terminal as your DTE proceed to the next step If you are using a computer as your DTE then run your communications software and configure it for terminal emulation If you are using...

Страница 35: ...us DTE ITU T V 25 bis commands sent to the modem from a terminal PC or other DTE Simple Network Management Protocol SNMP commands sent to the modem through a SpectraComm Manager card Terminal or Telne...

Страница 36: ...ct Green When ON the modem has turned on DTE interface pin 8 or DCD is on indicating it is receiving data TR ON indicates the DTE has turned On DTE interface pin 20 or DTR is On indicating it is ready...

Страница 37: ...that follows your number can contain up to 30 digits P follows D command tell the modem to pulse dial use dial digits 0 9 T follows D command tell the modem to tone dial use dial digits 0 9 and symbol...

Страница 38: ...ter where AT AT command prefix instructs modem to pay attention to the characters that follow D Dial command instructs modem to dial P Instructs modem to use pulse dialing 9 Instructs modem to dial 9...

Страница 39: ...be enabled to provide automatic response to incoming calls 1 When the value stored in S Register 0 is greater than zero auto answer is enabled 2 The modem counts ring signals on the line and display a...

Страница 40: ...modes Any character sent from the DTE to the modem at the originate end during dialing or the handshake sequence aborts the call Loss of carrier An abort timer set for 1 to 30 seconds via the S7 x com...

Страница 41: ...e modem handshake without user intervention The Online Security sequence can then proceed with the cell password prompt It is important to note that if callback is also desired the modem should be con...

Страница 42: ...ity available under special conditions This use of cell passwords provides a lesser degree of security but allows access if the SCM fails or all RADIUS servers fail Refer to the SCM Installation Opera...

Страница 43: ...Cell 1 C S0 ATDT phone number S6 P1 Online password F1 2 Z1 callback phone number Not Mandatory Online Callback with password in Cell 1 C S0 ATDT phone number S2 P1 Online password F1 2 Z1 callback p...

Страница 44: ...ion Key P0 SteadFast password S11 N4 X1 Encryption Key P0 SteadFast password S11 N4 SAM Authentication SAM only X0 SAM ID X1 SAM PIN S16 Z9 phone number N4 Q3 SAM and SteadFast X0 SAM ID X1 SAM PIN P0...

Страница 45: ...a phone number cell of the answering modem by means of the Zn nnn command Up to ten phone numbers can be stored in memory cells 0 through 9 using the Z command Example To call a modem at 555 1212 and...

Страница 46: ...is described below Online Security with Callback requires that an online cell password be configured with a callback extension A callback extension causes the answering modem to disconnect and then ca...

Страница 47: ...s number cell ENTER 5 The caller s screen displays NO CARRIER indicates the disconnect RING indicates the incoming call CONNECT followed by the appropriate connect message indicates the modems are in...

Страница 48: ...indicates that the modem is capable of RADIUS Security If other Product codes are displayed such as 288 your modem will not support RADIUS Enabling RADIUS in the Modem To enable RADIUS at the answeri...

Страница 49: ...ption Key using the following AT command Encryption key must be entered in both modems exactly with no errors spaces corrections or backspaces AT X1 Encryption Key where the key consists of up to 32 A...

Страница 50: ...option are already capable of secure access controller authentication For modems already installed in a customer s network contact your GDC service representative to arrange for an upgrade To configur...

Страница 51: ...iled connection before the modem redials the server Values are 0 20 second delay 1 to 30 the delay in minutes 7 Enable SAM mode operation and make it non volatile by typing AT S16 W or AT S17 W where...

Страница 52: ...the SAM modem phone number and the public encryption key to the client application Once received the call is dropped 3 The client modem then dials the SAM modem 4 With a successful exchange of message...

Страница 53: ...10 minute increments default is 1 i e 10 minutes When remote configuration is disabled R1 the SAM modem will only answer incoming calls if it has a valid key Otherwise the modem will disconnect immed...

Страница 54: ...Server sends the client the SAM phone number and its public key over the secure tunnel AS then disconnects the call Second Call 3 Client calls the SAM and performs a public key exchange over a secure...

Страница 55: ...command mode and synchronous operation in data mode Depending on its option settings you can set the modem to enter command mode and wait for the next AT command by one of three methods Using AT D1 co...

Страница 56: ...rmine the asynchronous data rate and parity settings of the local DTE You can type either AT or at but mixed cases such as At or aT will not give predictable results Multiple commands in a string may...

Страница 57: ...as fixed profile 0 Remote Configuration Using the AT Commands Remote Configuration allows you to use the local modem to connect to a remote modem and view or change the remote modem s user configurat...

Страница 58: ...his point 4 Once you have made your changes terminate the session according to the following options To terminate the session without saving or using the new profile enter X0 To terminate the session...

Страница 59: ...ction between local and remote modem 3 Send configuration changes to the remote modem 4 Terminate the session according to the following options To save changes made during the session terminate the s...

Страница 60: ...s Each telephone line connection whether switched network or private line between two modems in data mode begins with a handshaking sequence During that sequence the modems determine the VF telephone...

Страница 61: ...able 3 4 list the command combinations that set the various mode characteristics MNP Operation Overview When enabled for MNP operation the modem can be configured for compatibility with MNP Levels 2 5...

Страница 62: ...l 5 MNP Level 5 provides error correction and data compression for improved throughput Level 5 error correction provides synchronous framing with adaptive frame lengths The sending modem performs data...

Страница 63: ...rror Correcting Modes below The AT command Cn determines what mode the modem will fall back to and how it will handle data it receives before its mode is established The handshake sequence that occurs...

Страница 64: ...Mode In direct V 14 mode N1 there is no error correction data compression or data buffering The modem s DTE data rate and VF line speed must be set to the same value If for example the link between th...

Страница 65: ...le with asynchronous operation described below and two that are only for use with synchronous data compression Software Flow Control Software flow control uses the XON Control Q and the XOFF Control S...

Страница 66: ...gth of time permitted to switch DTE before the call is disconnected Direct Dialing in Synchronous Mode Direct dialing in synchronous data mode can be accomplished in either of two ways DTR dialing sel...

Страница 67: ...ble for use with synchronous compression Both require that the modem be configured for internal timing see below Flow control for synchronous compression can be accomplished by Clock Stopping Q5 in wh...

Страница 68: ...k derived by the local modem from the data it is receiving from the remote modem also called wrap timing The preferred clock source varies for different computer systems Consult your computer s manual...

Страница 69: ...doing so degrades throughput If you have call waiting you should disable it while you are on the line to prevent loss of through put In some areas for example you can disable call waiting by dialing...

Страница 70: ...ree times or press the AL button Private Line Configuration In any private line connection first designate one modem as the originate modem O0 and the other as the answer modem O1 Next configure both...

Страница 71: ...e changes are complete an O command can be used to go back on line or an H command can be issued to go to idle From idle either the talk data switch or O can be used to initiate a new connection Once...

Страница 72: ...plays the Shelf Inventory screen Proceed to the Shelf Inventory Screen paragraphs below Telnet Connection 1 When you establish a Telnet connection to the SCM LAN port the SCM Telnet Login screen is th...

Страница 73: ...unit you intend to work with then press Enter If the selected unit is a Dual V 34 modem the unit displays the Line Selection screen shown below i 4 In the Line Selection screen Line 1 designates the...

Страница 74: ...eat last command A Escape sequence to place a unit configured for private line operation into command mode Selecting AT Session through the terminal interface automatically forces the unit into the AT...

Страница 75: ...message To Exit AT Mode and Return to Main Menu use the AT Command Type AT commands to the unit just as you would from the DTE 4 When you are done entering commands type AT and press Enter The display...

Страница 76: ...for inputting AT commands 7 Configure the modem as required by typing AT commands just as you would from the DTE When complete check the AT option settings again to be sure that O is set correctly 8...

Страница 77: ...ces one minute without transitions in the Receive Data On DBU occurs when a modem that normally operates on a dedicated line connection has initiated a switched network connection due to problems with...

Страница 78: ...in bps at which the receiver connected to the remote modem Call Length Sec up to 65535 seconds During a current call displays duration at the time the screen was accessed Retrain Count number of times...

Страница 79: ...erface signals OFF or ON To dismiss the DTE Status screen and return to the Main Menu press Enter Screen data reflects conditions at the moment you accessed the screen To update the display dismiss th...

Страница 80: ...Operation Modem Main Menu 3 46 SpectraComm Dual V 34 Modem 060R122 000 Installation and Operation Issue 15...

Страница 81: ...ast command entered This is the only command that can be issued without the AT prefix The modem acts on the command line only The AT prefix space carriage return and line feed characters are not consi...

Страница 82: ...odem is being used interactively on a terminal or with a terminal emulation package issue AT and then press Enter 5 If the V 34 is connected properly it will respond to the command by displaying the b...

Страница 83: ...es the fallforward fallback feature Only functions when the modem is optioned for synchronous data mode or for asynchronous with speed buffering and only for V 34 V 32 and V 32 bis modes An Auto relia...

Страница 84: ...es data compression in both directions C2 In V 42 bis or synchronous enables data compression in the transmitter path In MNP 5 enables data compression in both directions C3 In V 42 bis or synchronous...

Страница 85: ...rects the dialer to redial the attempted dial string up to n times if the modem does not achieve data mode Ln Directs the dialer to dial phone cell n if the modem fails to achieve data mode with the c...

Страница 86: ...wire private line operation F3 Selects synchronous two wire private line operation Fn x Password cell qualifier Determines which callback extensions if any can be used with the password stored in a sp...

Страница 87: ...kbps maximum rate G17 33 6 kbps maximum rate DEFAULT Gn Modem to modem flow control Provides modem to modem flow control for non error corrected data links that require a constant speed DTE interface...

Страница 88: ...cts V 34 auto 28 8 300 H1 selects V 34 only 28 8 2400 H2 selects V 32 bis automatic 14 4 300 H3 selects V 32 bis only 14 4 4800 H4 selects V 32 automatic 9600 300 H5 selects V 32 only 9600 4800 H6 sel...

Страница 89: ...cryption is enabled country code must be 001 for USA or Canada VF Card Displays NONE Not applicable in the Dual V 34 Modem DTE Card Displays 232 Not applicable in the Dual V 34 Modem Leased Line Displ...

Страница 90: ...m for private line or switched network lines L0 Switched network mode L1 2 wire private line mode Mn Operating mode Selects between asynchronous and synchronous operation in data mode See the Vn comma...

Страница 91: ...el of 26 dBm M2 M10 Initial transmit power level of 10 dBm M11 M31 Initial transmit power level of 11 dBm to 31 dBm respectively J Performs MNP10 link negotiation at 1200 bps this call only See H1 com...

Страница 92: ...e command may be used alone or as part of a dial string When P is used alone it makes pulse dialing the modem s default dialing method When P is used in a dial string it acts as a modifier and affects...

Страница 93: ...etween modem and DTE Q2 Enables the modem to flow control the DTE via CTS Q3 Operates the same as the Q2 option and also allows the DTE to flow control the modem via RTS as a ready to receive signal Q...

Страница 94: ...23 32 0 kbps R24 48 0 kbps R25 56 0 kbps R26 64 0 kbps R27 72 0 kbps R28 96 0 kbps R29 112 0 kbps Rn Remote configuration write access Controls remote configuration write access This command is not af...

Страница 95: ...efault is 13 ASCII CR Line Feed character S4 Holds the ASCII equivalent 0 127 of the Line Feed character User defined value not saved after powerup reset The default is 10 lf Backspace character S5 Ho...

Страница 96: ...The default is 5 seconds After the whole second timer expires the register is then used to debounce the DTR signal as above The same number stored in the register is applied to both the whole second a...

Страница 97: ...to follow carrier detect S3 Selects DSR forced On in all modes Sn Password operation Selects what type of password security the modem will enforce Refer to Security Overview for detailed information...

Страница 98: ...nitiate a remote digital loopback T6 Instructs the modem to transmit the in band request to establish a remote digital loopback with the far modem T7 Instructs the modem to transmit the in band reques...

Страница 99: ...established Refer to Vn Connect Messages as noted below for message details V0 Options the modem to send the standard GDC Connect message upon reaching fata mode plus V 42 messages after the link nego...

Страница 100: ...nals are monitored and reported to the local DTE Country configuration definitions can restrict the storage function X0 Forces blind dialing disables all CPM and only the CONNECT message is sent for a...

Страница 101: ...hile on line Y0 Disables long space disconnect Y1 Enables long space disconnect Yn Power up user profile Determines which of the stored user configuration profiles Wn will be activated at modem power...

Страница 102: ...e the DTE s speed to match the displayed connect speed When the modem is optioned for speed buffering N0 or an error correcting protocol N2 through N5 the Tn command alone selects the DTE speed The Hn...

Страница 103: ...Disable B0 B Auto Dial Restoral Disable B0 Disable B0 Disable B0 Disable B0 B Character length B2 B2 B2 B2 See the detailed description for AT command B C Pre link data buffer C2 C2 C2 C2 See the det...

Страница 104: ...reliable N3 Auto reliable N3 Auto reliable N3 O Answer mode Ans mode if ringing O 0 Ans mode if ringing O 0 Ans mode if ringing O 0 Ans mode if ringing O 0 P Private line handshake mode V 34 only P0...

Страница 105: ...to DTR 0 05 sec S25 5 0 05 sec S25 5 0 05 sec S25 5 0 05 sec S25 5 S25 Delay to DTR V0 or V1 with sync data mode 5 sec S25 5 5 sec S25 5 5 sec S25 5 5 sec S25 5 S26 RTS CTS delay 0 sec S26 0 0 sec S2...

Страница 106: ...ock source Internal X0 Internal X0 Internal X0 Internal X0 X Call Progress Monitor Ext results full CPM X4 Ext results full CPM X4 Ext results full CPM X4 Ext results full CPM X4 Y Power up user confi...

Страница 107: ...NECT 2 Incoming ring detected RING 24 Exchange cannot dial number UN OBTAINABLE NUMBER 3 Link dropped NO CARRIER 6 Dial tone not present NO DIALTONE 8 Remote not answering NO ANSWER 7 Line busy BUSY 2...

Страница 108: ...LASS 5 Note When AES Encryption is in effect V0 and V1 connect messages will display AES at the end of the protocol string Table 4 4 V1 Connect Message Descriptions NUMERIC V0 MEANING VERBAL RESPONSE...

Страница 109: ...e DTE Link at 2400 CONNECT 2400 REL 33 Reliable DTE Link at 4800 CONNECT 4800 REL 34 Reliable DTE Link at 7200 CONNECT 7200 REL 35 Reliable DTE Link at 9600 CONNECT 9600 REL 36 Reliable DTE Link at 12...

Страница 110: ...AT Command Set Operation AT Command Details 4 30 SpectraComm Dual V 34 Modem 060R122 000 Installation and Operation Issue 15...

Страница 111: ...After configuring the modem by using the AT command set use the Vn command to switch to the V 25 bis command set Table 5 1 summarizes the V 25 bis compatible command set Table 5 1 V 25 bis Command Set...

Страница 112: ...and set can include operating parameters such as data rate handshake mode and synchronous timing source as well as storage of phone numbers in the modem s memory cells In order for the V 25 bis comman...

Страница 113: ...ne was not detected dial tone time out occurred CFI DF Call failure indication telephone number delayed list which uses the 10 memory cells is full Numbers which are redialed continuously without maki...

Страница 114: ...r by invoking the CRS command in 108 2 mode or by turning On circuit 108 1 in 108 1 mode 108 1 dialing uses only the number stored in memory cell 0 To store a number type PRN n1 n2 LF where n1 is the...

Страница 115: ...ed common to the two commands 2 For 1200 bps V 22 operation select PRS HM 7 PRS HM 6 is an auto mode so setting the DTE to 1200 bps PRS DR 3 will not force the connection to 1200 bps 3 When the modem...

Страница 116: ...bps 10 16 800 bps Note a When the modem is optioned for an external transmit clock source PTM 1 the modem should be optioned for a fixed not an automatic handshake mode e g select V 32 bis only PRS H...

Страница 117: ...k supplied by the DTE type PTM 1 LF To select receiver wrap clock derived from received data type PTM 2 LF V 25 bis Communication Commands Communication commands allow you to establish and terminate d...

Страница 118: ...numeric characters following T to be dialed using tones Used to select tone dialing for compatibility with the telephone system you intend to use or Causes the modem to pause a specified length of tim...

Страница 119: ...er the specified number of rings 3 When communication is established your terminal displays the CNX response and data transfer can take place If communication is not established your terminal will dis...

Страница 120: ...tion when DSR comes On Recognize connected data rate from the CNX message Send connect CNX message Enter data transfer mode Turn On RTS to send data Turn On CTS in response to RTS Turn Off DTR to term...

Страница 121: ...nal interface circuit 108 1 4 When communication is established you may transfer data Automatic Call Answering The modem can answer calls automatically in 108 1 mode if the function has not been disab...

Страница 122: ...ous or asynchronous The ITU T V 25 bis 108 2 mode recommendations describe the exchange of commands and responses between the units using both types of operation The V 34 supports command response exc...

Страница 123: ...not recognize the C or A fields unless verified as shown above The modem uses the BISYNC BSC format in the byte oriented synchronous mode V3 AT command The structure of each message in this format is...

Страница 124: ...ty 1 stop LF ASCII Line Feed Character 00001010 Modem Test Modes When optioned to operate in the synchronous V 25 bis mode the V 34 supports the following test modes that can be initiated from the Fro...

Страница 125: ...the modem has been in data mode for approximately 30 seconds b Once a modem is in Slave RDL it ignores all requests other than AL c If an MRDL request does not get a response from the Slave modem at...

Страница 126: ...he modem issues a CONNECT _ _ _ _ message at the last known DTE rate If the DTE rate and handshake rate differ the user can change the DTE speed to match the rate reported by the CONNECT message Table...

Страница 127: ...flashes the TM LED while it is setting up the test then lights the TM LED while the test is running HELLO DTE INTER FACE TX LOGIC RX LOGIC TX DRIVER ANALOG RECEIVER ANALOOP Communications Line Enter t...

Страница 128: ...t 300 bps Table 6 2 Analog Loopback with Self Test Step Front Panel AT Command Mode 1 To start the test press AL switch then the ST switch for the modem you are testing a or b To start the test type A...

Страница 129: ...OGIC RX LOGIC TX DRIVER ANALOG RECEIVER ANALOOP PATTERN GENERATOR Communications Line If the timer S Register 18 is set to a non zero value the test terminates automatically when the timer expires 10...

Страница 130: ...t type the escape sequence and after the modem is in the command mode type AT T3 enter If modem responds with an error message type AT T0 enter which resets the test mode then re enter the command 3 T...

Страница 131: ...h the remote attendant that the remote modem will accept Remote Digital Loopback commands 3 To start the test type the escape sequence and after the modem is in the command mode type AT T6 enter If mo...

Страница 132: ...e 6 6 Remote Digital Loopback with Self Test Data Path Note This test cannot be performed if the remote modem is configured to ignore a remote digital loopback com mand Step AT Command Mode 1 Establis...

Страница 133: ...cations line This test is not operational when the modems are passing data at 300 bps or the modems are configured for error correction n2 n3 n4 n5 Table 6 6 End to End Self Test Step Front Panel AT C...

Страница 134: ...OGIC RX LOGIC TX DRIVER ANALOG RECEIVER local modem PATTERN GENERATOR Communications Line If the timer S Register 18 is set to a non zero value the test terminates automatically when the timer expires...

Страница 135: ...B 00001011 43 2B 00101011 CTRL L FF 12 0C 00001100 44 2C 00101100 CTRL M CR 13 0D 00001101 45 2D 00101101 CTRL N SO 14 0E 00001110 46 2E 00101110 CTRL O SI 15 0F 00001111 47 2F 00101111 CTRL P DLE 16...

Страница 136: ...1101011 L 76 4C 01001100 l 108 6C 01101100 M 77 4D 01001101 m 109 6D 01101101 N 78 4E 01001110 n 110 6E 01101110 O 79 4F 01001111 o 111 6F 01101111 P 80 50 01010000 p 112 70 01110000 Q 81 51 01010001...

Страница 137: ......

Страница 138: ...The Best Connections in the Business...

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