Anti static Precautions Electrostatic discharge (ESD) results from the buildup of static electricity and can cause computer components to fail. Electrostatic discharge occurs when a person whose body contains a static buildup touches & computer component, ‘The equipment may contain static-sensitive devices that are easily damaged and proper handling and grounding is essential.
Table of Contents 1 System Description Features... Technical Characteristics .. 1-3 2 Installation CABBED errors solo seers 21 3 Operation Controls and Indicators... Communications Software Setting Up Data Communications and Fax Software..3-3 Commanding the Modem . Password Security Stead Fast Security Password On-line Password Security .. Connect Message TYPE...
Quested’ II V.90 Data / Fax PC External Modem The compact and value packed Quested III from General Data Comm (GDC) complies with the latest standards-based V.90 and V.34 technology. It offers both the highest speed and full interoperability with other V.90 modems. In addition toV.90 and V.34 standards, Quested III is compliant with existing dial-up standards. Quested IIT connects at the fastest possible line rate and continuously checks to ensure that the selected rate is valid.
INFORMANT LM TO THE USER BRE among This device complies with gear 15 of the FCC Rules. Joe ration ig Subject to the following two conditions: CLE This davit May aot cause acetyl interference, and 121 This device must ACCEPT ANY interference waived including interference that may cause undesired operation. NOTE: This equipment has been tested and found Lo comply with the limits tor a Class B digital device. Pursuant to Part 13 of the FCC Ru lay.
1 System Description The GDC Quested III modem is a multi-speed switched network modem providing 56 bps to 300 bps asynchronous operation. It has integral error correction and data compression capabilities, and provides compatibility with the most popular switched network modems. The Quested [II provides automatic dialing and configuration using the AT (Attention) command set. Features « 2-wire, full-duplex, switched network operation. + Manual or automatic answer.
1-2 System Description Equipment When unpacking the box, check that ail components are included. Each box includes: * Quested IT V.90 Modem + Technical Reference Guide * Phone line cable * Power supply * 25-pin to 25-pin / 9-pin terminal cable NOTE: All the special accessories provided by the party responsible for the equipment (GD, such as the terminal cable and the power supply are required to enable the Quested Ill modem to comply with the emission limits of FCC Part 15.
1-4 System Description Table 1-1 Technical Characteristics (Cont.) Item Specification VF Data Rate (Cont.) 24.0 bps (IT-T V.34) Asynchronous 21.6 bps (IT-T v.34) Asynchronous 19.2 bps (IT-T V.34) Asynchronous 16.8 bps (IT-T V.34) Asynchronous 14.4 bps (IT-T V.34 or IT-T V.32 bis} | Asynchronous 12.0kbps (IT-T V.34 or IT-T V.32 bis) Asynchronous 9600 bps (IT-T V.34 or IT-T V.32) Asynchronous 7200 bps (IT-T V.34 or IT-T V.32 bis) Asynchronous 4800 bps (IT-T V.34 or [TU-T V.32) Asynchronous 2400 bps (IT-T V.
System Description 1-5 Table 1-1 Technical Characteristics (Cont.) tem Specification Modulation 28 to 56 bps V.90 As specified by [TU-T 2.4 1033.6 bps V.34 As specified by IT-T 14.4 bps 128-level TCM/2400 Baud 20.01% 12.0 bps 64-level TCM/2400 Baud £0.01% 9600 bps 32-level TCM/2400 Baud £0.01% 9600 bps 16-level QAM/2400 Baud 0.01% 7200 bps 16-level TCM/2400 Baud £0.01% 4800 bps 4-level QAM/2400 Baud 0.01% 2400 bps 16-level QAM/600 Baud 0.01% 1200 bps 4-level PSK/600 Baud 20.01% 0-300 bps FSK 0-300 Baud 0.
1-6 System Description Table 1-1 Technical Characteristics (Cont.) Item Specification Transmit Carrier (Cont.) Bell 103 Originate Mode Mark Space 1270 Hz x12 Hz 1070 £12 Hz Answer Mode Mark Space 2225Hz +12 Hz 2025 +12 Hz Output Level Permissive Switched network |-9 dBm maximum Receive Carrier IT-T V.90 As specified by IT-T IT U-TV34 As specified by IT-T IT-T V.32 bis 1800 Hz +7 Hz IT-T V.32 1800 Hz +7 Hz IT-T V.
System Description Table 1-1 Technical Characteristics (Cont.) Item Specification Carrier Detect (Level for IT-T V.22 bis, 212,103) in Switched Network Acquisition Release -43 dBm -48 dBm Hysteresis 2 dBm minimum NOTE: vied for self-training detection to force bis/V 34 are echo canceling protocols that use signal quality as criteria for maintaining connection.
1-8 System Description Table 1-1 Technical Characteristics (Cont.) Fem Specification Call Progress Monitor BUSY CONNECT (rate) (see IT-T V.42 options for delay) CONNECT (see IT-T V.
2 Installation OTE (Data terminal hos ata stamina Equipment” 9.Pin DB Pin A DTE =) interface cable DB-25M to DE noe © 28F. RXD OTR 5 7 GND 6 6 DSR 7 4 RTS 8 5 c18 ° 22 ANG ac wall Telephone Optional outlet wall Jack Telephone 1. Turn Off the modem and the equipment connected to it. 2. Connect the modem as shown. {See the Quick Start Guide for a more detailed procedure). 3. Turn On the modem and the equipment. * Macintosh users use a standard Mac hardware-controlled modem shielded cable (not included).
3 Operation Controls and Indicators Figure 3-1 illustrates and describes the front panel of the unit LED ON OFF cs Medea has turned On DTE interface signal. indicating it is ready to transmit data. Modem is not ready to transmit data. will be displayed on the LED. RS DTE bas wed On interface | Indicates modem is nol ready to signal, indicating it is ready to] receive if \Q3 option is selected. * receive data transmission. CD | Carrier On lights when the modem | Carrier is off.
3-2 Operation Communications Software To operate a Quested III modem, you need to have a computer or a terminal (called the DTE) with an serial port. This port enables communication between the DTE and the modem, If a computer is being used as the DTE, it will also require a communications software package. If you plan on using error correction or data compression, the software package must support flow control.
TTR Operation 3-3 FAX The modem can support FAX Class 1 transmissions and can be used with fax software programs that support Class | fax commands. The Quested IT fax is compatible with all Group 3 fax machines, running at 2400, 9600, 9800, and 14,4000 bps. Setting Up Data Communications and Fax Software Factory defaults (AT&F) are adequate for most fax packages and data communications, such as Quick Link II, America On-Line, Prodigy, Pro comm Plus, Win Fax, and so on.
3-4 Operation When you tum the power on, the Quested ITI is in the AT command mode and accepts commands from the terminal. Each command string (except A/) must be preceded by the letters AT and followed bya carriage return or Enter. Multiple commands can be assembled together into a command string. The AT command buffer can hold up to 50 characters, The A/ command, which doesn’t require the AT-prefix and {enter)suffix, instructs the modem to repeat the last command string it received.
Operation 3-5 AT command defaults are shown in bordered lines: Table 3-1 Basic AT Command Set Command Action $ AT command set Help Display help menu for the basic AT command set Al Repeat command Repeat last command A Answer call Answer incoming call Dn Dial The dial command, followed by one or more dial command modifiers, manually dials a phone number: tor& Flash hook switch for 1/2 second ,or< Pause before continuing. Time is in S-Register § (default: 2 seconds).
3-6 Operation Table 3-1 Basic AT Command Set (Cont.
Operation 3-7 Table 3-1 Basic AT Command Set (Cont) Command Action Vn Result code type vo Numeric result codes; connect message = VF line speed vi Alphanumeric (verbal) result codes; connect and protocol messages after link; connect message = DTE speed, except for IT-T V.
3-8 The § command allows you to view (Sn?) or change (Sax) the §Registers. The S-Registers store values for functions that typically are rarely changed, such as timers or counters, and the ASCII values of control characters, such as Carriage Return. Table 3-2 summarizes the S-Register set. Operation Table 3-2 §Register Commands Definition Decimal S-Reg.
Operation 3.9 Table 3-2 S Register Commands (Cont.) Definition Decimal $-Reg. Function {default} | ASS Units Tolerable 9 Carrier presence 06 0.1 second | Yes timer 10 Carrier loss timer | 14 0.1 second | Yes 12 Escape code guard | 50 0.
3-10 Operation Table 3-3 Extended AT& Command Set Command Action &3 AT& command sel help.
Operation 3-11 Table 3-3 Extended AT& Command Set (Cont) Command Action &Hn Switched network handshake mode V.50 only (36 bps to V.34 auto (33.6 bps to 300 bps) V.34 only (33.6 bps to 2400 bps) IT-T V.32 bis automatic (14.4 bps 10 300 bps) IT-T V.32 bis only (14.4 bps to 4800 bps) IT-T V.22 bis only (2400 bps to 1200 bps) IT-T V.22 only (1200 bps) Bell 212 only (1200 bps) Bell 103 only (300 bps) TUT-T V.21 only (300 bps) ‘Maximum line connection rate « V.
3-12 Operation Table 3-3 Extended AT& Command Set (Cont.) Command Action &KI8 Maximum DCE connection rate 52 bps &K19 Maximum DCE connection rate 53.333 bps &K20 Maximum DCE connection rate 54.666 bps &K21 Maximum DCE connection rate 56 bps &R3 winched network operation synchronous data mode Asynchronous mode:On AT command mode:Force CTS On AT command mode:Force CTS On Asynchronous mode Real AT command mode:Real Asynchronous mode:Force CTS On AT command mode:Force CTS On NOTE: Flow control (\Qn) options ove
Operation 3-13 Table 3-3 Extended AT& Command Set (Cont.) Command Action &Un Trellis & able: &UT Disable &V View stored phone numbers. Display all 10 stored phone numbers.
3-14 Operation Table 3-4 Extended AT% Command Set (Cont) Command Action %Cn Data compression BCH Disable %C1 Enable in transmit and receive paths %C2 Enable in transmit path only in V.42 bis %C3 Enable in receive path only in V 42 bis %Dn DSR operation in test mode F%D0 Force DSR On during IT-T V.
3-16 Operation Table 3-4 Extended AT% Command Set (Cont.) Command Action %Ta Idle Switched Network timer in n minutes %Vn Command format BVO AT command set DTR | DIR dialing FZ1=x [Dial cell x on DTR active transition B22 Go off-hook and attempt to handshake on DTR active transition FoZI=x Dial cell x on DTR active transition; while DTR remains On redial if needed Table 3.5 Extended AT\ Command Set Command Action \$ AT\ command set help. Display help menu for the extended AT\ command set Overspend correctio
Operation 3-17 Table 3-5 Extended AT\ Command Set (Cont) Command Action Gn Modem-to-modem flow control {Only in Speed Buffer Mode) ar Enable XON/XOFF in transmit and receive paths \G2 Enable in transmit path only \G3 Enable in transmit and receive paths, with pass through Kn Break character handling KO Expedite break; destroy buffers \K1 Expedite break; save buffers \K2 Timed break; save buffers K3 Ignore break \K4 Timed break until no break character; save buffers KS "Timed break until no break character;
3-18 Operation Table 3-5 Extended AT\ Command Set (Cont) Command Action \Qn Modem-to-DYE flow control Qo Disable in both directions Qt Use XON/XOFF in both directions [2 Tse CTS ] Q3 Use TRISECTS Q4 Use XON/XOFF from modem to DTE only Rai Asymmetrical mode RO Disable [ORI Enable = In DTE speed \TO Auto baud; %R sets CPM message response speed RTT Last AT speed — TZ 300 bps \T3 1200 bps \T4 2400 bps \TS 4800 bps \T6 7200 bps 17 9600 bps \T8 12.0 bps \T9 14.4 bps \T10 16.8 bps \Tit 19.2 bps \T12 21.6 bps \T13
Operation 3-19 Table 3-5 Extended AT\ Command Set (Cont) Command Action \T21 115.2 bps \T22 128.0 bps \T30 230.4 bps \Vn Connect message type Wo Connect message reports VF rate upon data mode, link message after link negotiation (GDC format) wi Connect and protocol message sent after link negotiation, connect reported as DTE rate wz Connect and protocol message after link negotiation and Microcosm compatible, connect reported as VF rate W3 Connect message only after protocol negotiation, connect reported as
pr 3-20 Operation Stead Fast Security Password In Stead Fast Security the modem that initiates the call sends the password as part of its handshake sequence. In order to use a Stead Fast Security password, both modems must be GDC modems optioned for Stead Fast Security Both modems must have the same password saved in their password memory cell The remote user does not have to type in any additional passwords.
Operation 3-21 initiate the connection (Example ATDTS551212\1). If the callback cell number is not supplied with the phone number, the answering modem will disconnect the call. NOTE: To use Stead Fast Security password, the handshake modes of the modems must be V.34 V.32 bis (&H3) or V.32 NOTE: Telephone numbers stored for security callback should always include the :n (retry) modifier to compensate for any delay in receiving the dial tone from the Central Office after the initial connection is terminated.
3-22 Operation Connect Message Type \V0 options the modem to send the standard GDC Connect message upon reaching data mode plus V.42 messages after the link negotiation. The connect message displays VF line speed: Table 3-8 \VO Connect Messages Numeric Meaning Verbal Response 0 Command was successful Ok 4 Command failed Error 1 Link established Connect 2 Incoming ring detected Ring 23 Ring back detected Ringing 24 [Exchange cannot dial number | UN-obtainable number 3 Link dropped No carrier 6 Dial tone not
Operation 3.23 Table 3-8 \V0 Connect Messages (Continued) Numeric Meaning Verbal Response 63 Link establish a1 28000 Connect 28000 64 Link establish at 29333 Connect 29333 65 Link establish at 30666 Connect 30666 60 Link establish at 32000 Connect 32000 66 |Link establish at Connect 67 |Link establish at 34666 Connect 34666 68 Link establish at 36000 Connect 36000 69 [Link establish at 37333 Connect 37333 90 Link establish at 38666 Connect 38666 91 Link establish at Connect 92 Link establish at 41333 Connec
3.24 Operation \V1 options the modem to delay sending the Connect message until an error corrected link has been established. The Connect message indicates DTE speed unless a V.14 connection was established, in which case it will indicate the VF speed: Table 3-10 \V1 Connect Messages Numeric Meaning Verbal Response 1 DTE link at 300 Connect 5 DTE link at 1200 Connect 1200 10 DTE link at 2400 Connect 2400 i DTE link a1 4800 Connect 4800 Is DTE link at 7200 Connect 7200 12 DTE link at 9600 Connect 5600 16 DTE
Operation \V2 is similar to the \V1 function except that /REL is included at the end of the message when a V 42 error corrected link has been established. The message numbers 0 through 10 are the same as for WO Table 3-11 \V2 Connect Messages Numeric Meaning Verbal Response 30 Reliable DTE link at 300 Connect Rel 31 Reliable DTE link at 1200 Connect 1200/Rel 32 Reliable DTE link at 2400 Connect 2400/Rel 33 Reliable DTE link at 4300 Connect 4800/Rel 34 Reliable DTE link at 7200 Connect 7200/Rel 35 Reliable D
4 Troubleshooting Updated information and files can be obtained by accessing GDC at HTTP/ www.gdc.com We recommend the following procedure to troubleshoot your modem: + Set the modem to the factory configuration « Make sure that the modem is completely installed and computer and modem power is On. « Check that the cables are not loose or defective and are hooked up correctly. + Use the Troubleshooting Guide that appears below. by the communications software to the modem is correct.
4-2 Troubleshooting Difficulty Check-Out Solve No answer from Verify the configuration | See that the modem is set. modem, of the modems and DTR | to auto answer If setting. the TR light is not On, make sure &D0 is set {use Commandant. Modem doesn’t dial. Make sure that there is a dial tone. And if you use DTR dialing check out the phone number at the location where it is stored (&V command). Phone cabling or storing a number in Cell n. Set DTR option AT&DO. Modem doesn’t connect.
Troubleshooting 4-3 L Difficulty Check-Out Solve Premature modem See that the error correct Set the modem for nor disconnection. son is supported by the mal mode (AT\N) and remote modem. retry the call, if the remote modem is not supporting error correction. Garbled or lost data | Check the control set| Set the flow control of tings of the modem flow. | the modem 10 RESTRICTS {AT) if you are using a communications software package that is supporting RESTRICTS flow control.
4-4 Troubleshooting dem or is aborting during the transfer. Verify that the computer uses a high speed COM port with a 16550 a ART {at high DTE speeds). Run MSD in DOS mode. Difficulty Check-Out Solve A file cannot be Check the flow control set| Set the flow control on transferred by mo[tings of the modem | the computer and the modem to RESTRICTS 0Q3). Reduce the terminal speed until you gate speed that is slow enough, if you are not using a 16550 ART. Install a high speed serial port with a 16550 ART.
Troubleshooting Call-Termination Cause of Termination Explanation Disconnect during the handshake. S7 timed out use a larger number security failure check your password. character abort disable by selecting %K1 Operator or software disconnect. Command to disconnect was given or TR was turned Off. Carrier loss during transmissions ~ no carrier message. § Register 10 timed out or remote modem may have dropped the call. Receive long space disconnect Only operates in V.22 bis mode.
Index Answer Call, 3-3 Auto Baud, 3-15 Automatic Answer, Basic AT Command Set, 3-5 Bell 103, 3-11 Bell 212, 3-11 Cabling, 2-1 Call Progress Monitor (CPL, 3-7 Carrier ON, 3-3 Operation, 3-10 Troubleshooting. 4-3 ‘Wait Timer, 3-8 Character Abort, 3-14 Break, 3-17 Length, 3-17 Commands ‘Troubleshooting, 4-1 Command Set, 3-16 Commanding the Modem, 3-3 Communications Software, 3-2 Connecting, 4-2 Connect Message Type, 3-30 \V0 and \V1 Connect, 3-31 \V1 Connect, 3-32 \V2 Connect, 3-33 Connection Rate, 3-10 Contro
Index Passwords, 3-20 Troubleshooting, 4-1 Security, 3-16 ART, 4-5 Phone Numbers, 3-12 User configuration profile, 3-7 Protocol, 3-18 V.21, 3-11 Rear Panel, 2-1 V.22 bis, 3-11 Response Mode, 3-6 V.32 bis automatic, 3-11 Result code, 3-7 V.
Trademarks and Patents General Data Comm, the General Data Comm logo and the following are trademarks of General Data Comm, Inc.