Black Box MD885A-R3 manuale d’uso

CUSTOMER SUPPORT INFORMATION Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500 ) FREE technical support 24 hours a 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 AUGUST 19[...]

1 FCC Information FEDERAL COMMUNICA TIONS COMMISSION AND INDUSTR Y CANADA RADIO FREQUENCY INTERFERENCE ST A TEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. It has[...]

2 Modem 34336 T able of Contents 1.0 Specifications .....................................................................................6 2.0 Quick Star t ..........................................................................................8 2.1 Installation ..................................................................................8 2[...]

3 T able of Contents 3.3.1 V.42 Error Correction Options .............................................35 3.3.2 Dialer Mode ...........................................................................41 3.3.3 Data Format Options .............................................................42 3.3.4 Disconnect Options ..................................[...]

4 Modem 34336 4.10 Automatic Fallback ..................................................................76 4.10.1 Operating Mode Fallback ......................................................76 4.10.2 V.32 Speed Fallback ...............................................................78 4.11 V. 13 Operation .........................................[...]

5 T able of Conents 7.6 Diagnostic Monitoring: Status Screens .................................115 7.6.1 EIA Status Screen .................................................................115 7.6.2 Other Status Screens.............................................................116 7.7 Local Modem Diagnostics .......................................[...]

6 Modem 34336 1.0 Specifications Available Configurations — Stand-alone or rack-mount Compatibility — V.29 9600, 7200, 4800 V.32 terbo 19.2 or 16.8 kbps V.33 14.4 or 12.0 kbps V.32 bis 14.4, 12.0, 9.6, 7.2, or 4.8 kbps V.32 9.6 or 4.8 Kbps V.34+ 33.6, 31.2, 28.8, 26.4, 24, 21.6, 19.2, 16.8, 14.4, and 12 kbps, 9600, 7200, 4800, and 2400 bps V.34[...]

7 1.0 Specifications V.29 QAM at 9600, 7200, and 4800 bps V.27 8-phase DPSK at 4800 and 2400 bps V.26 4-phase DPSK at 2400 and 1200 bps V.23 FSK at 1200/75 bps, full duplex V.22 bis: QAM at 2400 bps; bandsplit, full duplex V.22: DPSK at 1200 bps; bandsplit, full duplex V.21: PSK at 0 to 300 bps; bandsplit, full duplex Autodialer — Automatic diali[...]

8 Modem 34336 2.0 Quick Star t All information in this manual applies to both the stand-alone and rack- mount versions of the Modem 34336. Q UICK S ETUPS FOR A Q UICK S TART The simplest and fastest way to set up the Modems for immediate use is to select one of the factory-preset Quick Setup configurations. Quick Setups are explained in Section 2.3[...]

9 2.0 Quick Start • If you are operating the Modem in a manual dial mode, you also need a standard telephone set. 2.1.4 C ONNECTIONS Figure 2-1 shows how the Modem is connected to the computer or terminal, AC power supply, phone lines, and handset. Do not install the modem more than 50 feet (15.2m) from the DTE (the EIA standard maximum length fo[...]

10 Modem 34336 For dialup applications: • Use the supplied two-conductor crossover cable to connect the Modem to the telephone-line modular wall jack. Plug the eight-pin connector (RJ-45) of the cable into the rear-panel jack labeled TX DIAL. Then, plug the six-pin connector (RJ-12) into the telephone jack. NOTE Do not bundle the telephone and RS[...]

11 2.0 Quick Start 2.2 Front-Panel LCD and Controls To select a Quick Setup configuration, you will need to use the pushbuttons and liquid-crystal display (LCD) on the modem’s front panel. These features are shown in Figure 2-2 . For a detailed explanation of the front panel controls, see Chapter 3 . 2.2.1 P OWER -O N S CREEN When the Modem is po[...]

12 Modem 34336 2.2.2 EIA S TATUS S CREEN The EIA status screen indicates the operational status of the Modem as well as the condition of certain EIA RS-232 leads. The abbreviations that may appear are identified below. Typically, only a few of these abbreviations will be displayed during actual operation. D = Dial line occupied. R = Ringing (R appe[...]

13 2.0 Quick Start 2.3 Quick Setup To set up the Modem for immediate use (or to quickly change the modem’s configuration for an alternate mode of operation), select one of the factory- preset Quick Setup configurations (see Table 2-1). Your Modem will be ready for operation. You will not need to make further adjustments. When you select a Quick S[...]

14 Modem 34336 All options for each Quick Setup configuration are listed in Appendix B . If you want to customize your Quick Setup configuration, see 3.0, Modem Setup Options . For Hayes ® mode options, see 5.0, Hayes Emulation Mode . T able 2-1. A vailable Quick Setup Configurations. QUICK SETUP IDENTIFIED ON LCD DESCRIPTION QUICK SETUP <01>[...]

15 2.0 Quick Start T able 2-1 (continued). A vailable Quick Setup Configurations. QUICK SETUP <07> 2-WIRE LEASED-LINE ANSWER MODE— 2-W LEASED (ANS) Same as Quick Setup 6 except for modem answer/ originate status. Use Quick Setup 7 if the leased line is a 2-wire line and you want to configure the Modem as the answer modem. QUICK SETUP <08[...]

16 Modem 34336 2.4 Basic Operation This section provides basic information for each of the modem’s primary operating modes. If you encounter difficulty, refer to Section 2.5, Problem Solving . 2.4.1 2-W IRE D IAL (H AYES ) M ODE (Q UICK S ETUP 1) Two-Wire Dial (Hayes) mode is the factory-default configuration for the Modem. Hayes mode operation a[...]

17 2.0 Quick Start Dialing Mode . The default dialing mode is tone dialing. To change to pulse dialing, insert a P after AT D : AT DP To change from pulse dialing to tone dialing, insert a T after AT D : AT DT The specified dialing mode remains active until the alternate mode is specified or the modem is reset. Connected . When a phone number is su[...]

18 Modem 34336 For V.25 bis operation, the Modem must be configured to use the same data protocol as the attached DTE. V.25 bis mode operation and commands are explained in detail in Chapter 6.0, V.25 bis Audodialer . Asynchronous V.25 bis Operation. The data format of the DTE should be set to 7 data bits with even parity and one stop bit. The defa[...]

19 2.0 Quick Start 2.4.3 2-W IRE D IAL (D UMB ) M ODE (Q UICK S ETUP 5) Dumb mode is used primarily for manual call origination, answer-only applications, and in conjunction with certain dial back security systems that utilize MI/MIC signals to place the modem on-line. (If you need to configure the modem for MI/MIC use, refer to Appendix D .) For a[...]

20 Modem 34336 Autodialing the Stored Number . To autodial the stored number from the EIA status screen, press the following pushbuttons in sequence: ENT Pushbutton 3 (to select DIAL from MAIN MENU screen 1) Pushbutton 1 (to select DIAL from the AUTO-DIAL screen) When the local modem successfully establishes a connection with the remote unit, the E[...]

21 2.0 Quick Start The following information applies to both 2-wire and 4-wire leased-line operation: • The modem must be configured for the correct line type –– 2-wire or 4-wire. If you select the correct Leased Line Quick Setup, the line type is automatically set to the correct setting. • One modem must be set to originate mode and the ot[...]

22 Modem 34336 2.4.5 V.33 L EASED -L INE O PERATION (Q UICK S ETUP 10) V.33 operation is available on the Modem at speeds of 12,000 and 14,400 bps. V.33 leased-line operation provides compatibility with V.33 modems (synchronous operation only). A 4-wire line must be used (conditioned or unconditioned), and both connected modems must be set for V.33[...]

23 2.0 Quick Start 2.4.7 4-W IRE L EASED L INE V.29 M ODE (Q UICK S ETUP 13) The 4-Wire Leased Line V.29 Mode configures the modem for V.29 operation, for compatibility with V.29 modems. Keep these guidelines in mind when using this mode: • The modem must be configured for use with a 4-wire line. • Operation is restricted to data rates of 4800,[...]

24 Modem 34336 2.4.8 V.29 F AST M ASTER AND S LAVE M ODES (Q UICK S ETUPS 14 AND 15) In multidrop operation, the master modem transmits to all of the slave (remote) modems. When the DTE at a slave site recognizes its own address in the polling protocol, it raises RTS to the slave transmitter. The slave responds by transmitting a special training se[...]

25 2.0 Quick Start 2.5 Problem Solving If you encounter difficulties in setting up or using the modem, try the remedies described below. If you suspect a system malfunction, follow the diagnostic procedures described in Chapter 7. If you cannot resolve the problem, call your supplier. 1. A LL M ODES Make sure all cables are properly connected to th[...]

26 Modem 34336 NOTE This page is intentionally left blank.[...]

27 3.0 Modem Setup Options 3.0 Modem Setup Options 3.1 Methods For Selecting Options The Modem allows you to easily select options for tailoring the modem’s operation to suit a particular application. You can be select options in the following ways: • Quick Setup — the easiest way to set up the Modem. Quick Setup (explained in Chapter 2 ) aut[...]

28 Modem 34336 3.2 Selecting Options from the Front-Panel 3.2.1 P USHBUTTONS AND THE LCD Options are selected from the front panel by pressing the front panel pushbuttons (Figure 3-1). The possible choices for each option are shown on the liquid crystal display (LCD) and on the flow chart at the back of this manual. 1. Arrow Pushbuttons. Use the le[...]

29 3.0 Modem Setup Options NOTE If you have selected a Quick Setup or have changed certain options settings, pressing the ENT pushbutton to exit the SETUP menu will cause the modem to reset. 3.2.2 H OW T O S ELECT O PTIONS Options are configured from the SETUP menu. To access the SETUP menu, press the right-arrow pushbutton at page 1 of the MAIN ME[...]

30 Modem 34336 2. Option-Selection Example . The following example illustrates option selection. As you follow the steps below, refer to the LCD flow chart (SETUP OPTIONS side) at the back of this manual. When you are finished, you can easily restore default settings for the type of application you are using by selecting the appropriate Quick Setup[...]

31 3.0 Modem Setup Options Press pushbutton 3 to select SPKVOL (speaker volume). The SPEAKER VOLUME screen is shown right. The currently selected setting flashes. Press pushbutton 2 to switch the volume setting to MEDIUM. MEDIUM begins to flash, indicating the new selected setting (although the new selection does not become active until you exit th[...]

32 Modem 34336 The default settings for each option are listed in Appendix B . The Quick Setup options (one for each operating mode) affect the entire modem configuration. See Chapter 2 . The Line Type options are available for all modes: • 2-WIRE DIAL — for dialup applications. • 2W-LL — for leased-line applications using 2-wire lines. •[...]

33 3.0 Modem Setup Options T able 3-1. Effect of Speed Limit Settings on Data Rate MAX RATE DIALER SETTING, bps OPTION RESULTANT DATA RATE, bps LEASED LINE MODES 14,400 1 xx 14,400 1 12,000 1 xx 12,000 1 9600 xx 9600 300 to 4800 xx 4800 EIA-CTRL xx 9600 or 4800 2 DIAL MODES—ANSWERING 300 to 14,400 1 xx Negotiated between minimum and maximum setti[...]

34 Modem 34336 • V.32. The Modem normally uses the V.32 handshake. (The Modem also uses this handshake for V.32/14,400 bps operation.) • V.33. V.33 operation is available on the Modem for 4-wire leased line synchronous operation only. The available data rates are 14,400 and 12,000 bps. Either of these rates may be set as the maximum or minimum [...]

35 3.0 Modem Setup Options 3.3.1 V.42 E RROR C ORRECTION O PTIONS The Modem supports both CCITT V.42 error correction and Microcom Networking Protocol ® (MNP ® ) error correction (classes 1 through 5). V.42 and MNP provide end-to-end error correction through an automatic repeat-transmission request algorithm. Both types of error correction enable[...]

36 Modem 34336 The available error correction options are listed below: • V.42 Mode • DTE Speed • MNP Class (class limit) • DTE-DCE and DCE-DTE Flow • Break Handling Control options • V.42 Selection • Flyback Buffer • Buffer Mode/Speed Conversion • Pass-Through Flow Control All of the above options affect the type of error correct[...]

37 3.0 Modem Setup Options The following two options are available through the V42 SELECTION screen: The Protocol option is available for Hayes, V.25 bis, Dumb, and Leased-Line modes (except V.33). • LAPM/MNP — The Modem attempts to establish a connection using the V.42 link access protocol (LAPM/MNP). This is the primary error correction proto[...]

38 Modem 34336 The Buffer Mode/Speed Conversion option Hayes, V.25 bis, Dumb, Leased line modes (except V.33). It enables or disables speed conversion (for asynchronous operation only) between the DTE and modem when error correction is not used. • ENABLE — When error correction is not enabled, the V.42 circuit functions as a buffer between the [...]

39 3.0 Modem Setup Options The DTE-DCE Flow Control options are available for Hayes, V.25 bis, Dumb, and Leased-Line modes (except V.33). • NONE — No flow control is used. • RTS ON/OFF — The Request to Send signal controls data flow from the modem to the terminal. • DC1/DC2 — Inserts control characters (CONTROL-R and CONTROL-Q) in the d[...]

40 Modem 34336 The Pass-Through Flow Control options are available for Hayes, V.25 bis, Dumb, and Leased-Line modes (except V.33). Pass-Through Flow Control affects DTE- DCE flow control only. This option determines whether flow control characters are passed through the communication channel (but only if control characters are used for flow control[...]

41 3.0 Modem Setup Options The V.25 bis Dialer Modes are available for V.25 bis mode. Any of the selections from the DIAL V25bis screen will enable the V.25 bis autodialer. For detailed information on the V.25 bis autodialer, see Chapter 6. The three selections on the DIAL V25bis screen allow you to select a data protocol that is appropriate for th[...]

42 Modem 34336 The Character Length option is available for all modes (asynchronous operation only). It selects a character length of 8, 9, 10, or 11 bits for character asynchronous operation. The same character length must be selected for both the local and the remote modems. Use pushbuttons 1 and 3 to select the desired character length. • 8 BI[...]

43 3.0 Modem Setup Options 3.3.4 D ISCONNECT O PTIONS When the modem is operating in V.25 bis or Dumb mode, it is necessary to disconnect the modem from the telephone circuit once communications are completed. The most common form of disconnection is by dropping the Data Terminal Ready (DTR) signal from the DTE. However, some applications may requi[...]

44 Modem 34336 3.3.5 T EST O PTIONS The Test Options affect certain tests (as explained below) but do not activate tests. The DSR During Analog Loopback is available for all modes. When ON is selected, the Data Set Ready signal is forced on when the modem is in the analog loopback test mode. In general, this option should be left ON (the default se[...]

45 3.0 Modem Setup Options NOTE The Modem also supports a CTS option intended only for V.33 and Bell 208A/B operation, described later in this chapter. The CD to EIA option is available for Hayes, V.25 bis, and Dumb modes. • NORMAL — Carrier Detect (CD) is on while the modem is on-line. • TRUE — CD follows DTR supplied from the DTE. • TOG[...]

46 Modem 34336 The Test Mode (TM to EIA) option is available for all modes. It controls pin 25, the test mode (TM) indicator, on the RS-232 interface connector. • NORMAL — TM output is high (active) only during test modes. • TRUE — TM output is high all of the time. 3.3.7 M ODEM S ETUPS The options listed below, through RTS-CTS DELAY, are a[...]

47 3.0 Modem Setup Options The Compromise Equalizers option is available for all modes. NOTE The compromise equalizers affect only V.32 operation (4800 to 14,400 bps, asynchronous/synchronous, full duplex). For most applications, the automatic adaptive equalizer setting provides all the equalization necessary to compensate for line impairments, mea[...]

48 Modem 34336 Normally, as part of the V.32 handshake, the calling modem begins sending a sequence to the answer modem while the answer modem is still sending answer tone. In this case, there is no T1 timer. However, the V.32 recommendation allows for a T1 time of up to 3 seconds, meaning that the answer modem may be set to wait (before falling ba[...]

49 3.0 Modem Setup Options The Speaker Volume option is available for all modes. It can be set to LOW, MEDIUM, or HIGH. The Guard Tones option is available for Hayes, V.25 bis, Dumb modes. Guard tones are used in V.22 and V.22 bis modes only, to assure proper band separation on systems that use international telephone circuits. Unless you are using[...]

50 Modem 34336 The CTS option is available for 4-wire Leased Line modes. It applies only to 4-wire leased line applications using constant carrier. • RTS — The CTS signal follows RTS. • ON — CTS is always ON. NOTE The Modem also supports a CTS to EIA option, which is described earlier in this chapter under EIA OPTIONS. The RTS-CTS Delay (CT[...]

51 3.0 Modem Setup Options The Turnaround Delay option is available for 208 mode. It is intended for circuits where echo is a problem. It prevents the Modem from receiving an echo of its own transmitted data. When the Turnaround Delay option is on, CD (pin 8) is held low for 150 ms after RTS is turned off. If the modem detects an energy loss during[...]

52 Modem 34336 • Enable — The Modem will check for X-ON/X-OFF (DC1/DC3) flow control characters received from the remote modem to determine whether to stop or start/restart data transmission to the remote modem. A DC3 (or DC2) control character will cause the Modem/Modem 3242–S to stop data transmission and hold data in its buffer until it re[...]

53 3.0 Modem Setup Options The 208 Phase Detection option is for 208 mode. • Normal — Conditions the modem’s 208 receiver for normal modulation detection. • Compensated — Conditions the 208 receiver for compensated modulation detection for improved performance with older 208 modems. The A nswer Tone Detection is for 208 mode. • Enable ?[...]

54 Modem 34336 4.0 General Operation and Special Features This chapter describes the following Modem features and operational modes (listed here in the order in which they are presented): • Quick reset • Dumb mode and Bell 208 operation • Phone number storage • Security operation • Leased Line Auto-Recovery • Diagnostic interface contro[...]

55 4.0 General Operation and Special Features If a number has been previously stored, the number is displayed on the top line of the LCD (instead of dashes, as shown above). Only one phone number can be stored per cell. To store a phone number, use the right and left arrow pushbuttons to go to the digit you want to change. The character at the curr[...]

56 Modem 34336 T able 4-1. Dialing Control Characters. Character Function A-D Used in some PBX applications (tone dialing only). L Links a phone number to another number to be dialed as an alternate. T Sets tone-dialing mode. P Sets pulse-dialing mode. R Configures modem for Dial Line Auto-Recovery. Requires / prefix. See DIAL LINE AUTO- RECOVERY s[...]

57 4.0 General Operation and Special Features 4.3.1 A UTODIAL B ACKUP The Modem automatically dials the stored number to connect over the backup line if it detects poor signal quality (ER) or a loss of carrier detect (CD) on the leased line. The criteria used by the Modem in assessing the condition of the leased line depend upon the settings of the[...]

58 Modem 34336 NOTE If DIAL IF BAD >> (1, 2, 3 or 4) min is selected, the Select option setting of the answer unit must be equal to or less than the Select option of the originate unit. If both modems are set for Manual Recovery , the originate unit is used to autodial the number stored via the PHONE screen without having to change the LINE T[...]

59 4.0 General Operation and Special Features Recovery from the front panel, enter the phone number to be dialed followed by /R (the Dial Line Auto-Recovery command) on the PHONE screen (shown below). If you need assistance, see Section 4.2 . An alternate way to configure the Modem for Dial Line Auto-Recovery (in Hayes mode only) is to use the Haye[...]

60 Modem 34336 4.5.1 D IALING A S TORED N UMBER DTR dialing allows you to set up the Modem to automatically dial a stored number even when the autodialer is not enabled. To enable DTR dialing, select DTR from the DIALER option screen. When DTR dialing is enabled, an OFF-to-ON transition of DTR causes the Modem to automatically dial the number previ[...]

61 4.0 General Operation and Special Features place the handset back on the cradle. The LCD displays the status of the communication. It appears as shown below. The data link between the two modems is now established, and data transfer begins. An incoming call may be answered manually or automatically. To answer a data call manually, you must disab[...]

62 Modem 34336 4.7 Modem Security Operation In 2-Wire-Dial Hayes emulation mode only, the Modem can be configured to provide security on incoming calls. Remote users attempting to connect to the Modem are required to enter a password. Incoming calls are accepted only if the user enters a valid password. NOTE The security features described in this [...]

63 4.0 General Operation and Special Features The modem’s security configuration for password protection is controlled from the DTE by a special set of password commands. The commands are implemented by using the Hayes AT &Z command to store them in memory. If an administrative password is implemented, the AT &Z command will not function [...]

64 Modem 34336 Rules for using passwords and password commands are listed below. • Memory locations 0 and 2-9 may be used for storing phone numbers; locations 2-9 may be used to store passwords. • The entire command string, including the AT &Z command, cannot exceed 40 characters. • Passwords and commands may be entered in capitals or low[...]

65 4.0 General Operation and Special Features 2.Unlocking the &V and &Z commands. If an administrative password is implemented, the Hayes compatible &V and &Z commands cannot be accessed unless they are first unlocked using the current administrative password. (&V is used to view the active modem configuration, stored phone numb[...]

66 Modem 34336 NOTE Passwords may be stored only in memory locations 2 through 9. 5.Programming a response to a correct password. Enter the following command, replacing CONNECTED with your message: AT &Z0=/UCONNECTED The DTE responds with the specified message when the modem receives a correct password. NOTE The /U command and message can be st[...]

67 4.0 General Operation and Special Features Control Procedure (Modem-to-Modem) Enabling Modem-to-Modem Remote Control Mode To remotely control a modem connected by a direct phone link, access REMOTE screen 1 (shown below). If you select CONTROL, you will be able to control the front panel of the remote modem from the front panel of the modem you [...]

68 Modem 34336 Remote control through a rack controller is an especially valuable capability for modem used in high-density 16-slot enclosures. The low-profile modems specially designed for these racks are manufactured without an LCD user interface or control pushbuttons. One way to access the low-profile modems to monitor, test, or configure tham [...]

69 4.0 General Operation and Special Features 2. Enter the address or slot number—To enter the address or slot number of the modem to be controlled, press pushbutton 3. If ADDR/C is displayed on REMOTE screen 2, a screen showing ADDRESS: 000,000 on the top line will be displayed. If SLOT/C is displayed on REMOTE screen 2, a screen showing SLOT NU[...]

70 Modem 34336 Figure 4-1. Remote contr ol—address contr ol mode. Modems in rack equpped with rack controller Standalone modems Modems in rack with or without rack controller This modem, with LCD pushbuttons, can control any of the shaded (gray) modems.[...]

71 4.0 General Operation and Special Features 4.9 Diagnostic Interface Control The diagnostic software built into the Modem supports a special set of commands known as diagnostic port commands. The commands (listed in Table 4-3) are used to configure modems (from either a local or remote location), or to monitor modems for diagnostic purposes. The [...]

72 Modem 34336 T able 4-3. Diagnostic Port Commands. COMMAND FUNCTION CONNECT g,u Connect to diagnostic port of modem at group address g, unit address u. An address must be specified unless the wildcard character * is used: CONNECT * (meaning Connect to local modem; address unknown/unspecified.). When the connection is made, the DTE displays the mo[...]

73 4.0 General Operation and Special Features A carriage return [CR] is required at the end of a command line except when the command line consists of only one single-character command. Commands can be entered in upper or lower case. Other diagnostic port commands are available for factory use only. Therefore, some commands that are not listed abov[...]

74 Modem 34336 T able 4-4. Responses T o Diagnostic Port Commands. RESPONSE MEANING ERROR Command error (incomplete, wrong syntax, etc.). (If CONNECT or CON is issued without an address or *, the modems will not connect, and there will be no ERROR message.) ADDRESS g,u The Modem has connected with diagnostic port of modem at address g,u (group and [...]

75 4.0 General Operation and Special Features 4.9.4 DTE D ISPLAYS When Auto-Display is enabled, an update of the LCD is automatically displayed on the DTE screen each time a command (E, 1, 2, 3, left arrow, or right arrow) is entered to control the front-panel LCD on the connected modem. Auto-Display is enabled when the long-form connect command (C[...]

76 Modem 34336 • If you want to disconnect from the diagnostic link without establishing a new link, issue the CONNECT command without an address. 4.10 Automatic Fallback The Modem incorporates two automatic fallback features that are controlled by the user: • Operating Mode Fallback— Provides compatibility with modems that use any of several[...]

77 4.0 General Operation and Special Features Changing the Operating Mode Fallback parameter to 1 has the following effects: • The Modem is configured for V.22 bis 2400 bps/V.22 1200 and 600 bps/V.21 300 bps/V.23 1200/75 bps fallback operation. As a result, 600 and 1200/75 bps appear as additional selections on the SPEED LIMIT LCD screens. • Fa[...]

78 Modem 34336 Table 4-6. V.22 bis/V.22/V.21/V.23 FALLBACK. MODE DESCRIPTION V.22 bis 2400 bps asynchronous/ synchronous V.22 1200 and 600 bps asynchronous/synchronous V.21 300 bps asynchronous V.23 1200/75 bps asynchronous All modes are full duplex. The operating mode is controlled through the SPEED LIMIT screens on the LCD in all modes except Hay[...]

79 4.0 General Operation and Special Features If Rate Renegotiation Procedure (RRP) is enabled, the modem will automatically fall back or fall forward to a lower or higher data rate in response to changes in signal quality. This may happen at any time during data transmission, and it is done without a retraining procedure. Your data transmission is[...]

80 Modem 34336 After you select UP or DOWN, the LCD will automatically switch to the EIA status screen so you can see the result of the rate-change request (i.e., the current data rate, which is displayed in the lower left corner of the EIA status screen). However, if the Modem has reached the minimum or maximum speed, it will not switch to the EIA[...]

81 5.0 Hayes Emulation Mode 5.0 Hayes Emulation Mode For easy reference, the following tables appear consecutively at the end of this chapter: • Table 5-1. Hayes Compatible Commands • Table 5-2. Hayes Mode Result Codes • Table 5-3. S Register Functions 5.1 Hayes Mode Autodialer When the Hayes emulation mode is enabled, the Modem emulates a Ha[...]

82 Modem 34336 • Command Sequence. For dialing, a command line begins with AT, followed by a D and the phone number. Other commands should be placed before the dial command—or after the dial command if it is terminated with a semicolon. See the example below: AT M2 V1 D 555-1212; S2=1O The above command instructs the Modem to keep the speaker o[...]

83 5.0 Hayes Emulation Mode • Dial Command Modifiers. Several modifiers can be used with the basic D (dial) command to alter dialing operations. The modifiers are explained below. Dial Command Modifiers: L — Links a phone number to another number to be dialed as an alternate P — Sets pulse-dialing mode S=m — Dial number stored at memory loc[...]

84 Modem 34336 5.1.3 R ESULT C ODES Result codes (see Table 5-2) are messages sent by the modem to the DTE monitor in response to your commands. Result code options are selected using the V and X commands, as explained below. Result codes may be words ( V1 command) or digits ( V0 ). Word codes are preceded and followed by a carriage-return, line-fe[...]

85 5.0 Hayes Emulation Mode For most commands, there are parameters—numerical values used with the command specifying the function of the command. For example, the command L controls the modem’s speaker volume. L2 sets the volume to medium. The default value is a predetermined value which is in effect the first time the Modem is powered up or w[...]

86 Modem 34336 • H — Telephone Switch Hook . The H command (on-hook) is used to terminate a call. (On-hook corresponds to off-line.) H may also alternate between voice and data transmission during the same call (if your communication software supports this capability). The H1 command (off-hook) activates the telephone line relay, causing a dial[...]

87 5.0 Hayes Emulation Mode • O — Forced On-Line . For asynchronous operation only. When the modem is on-line, you can return to the command state by entering the escape code (+++). After the desired command is executed, use the O command to force the modem from the command state to the on-line state. • P — Pulse Dial . The P command instru[...]

88 Modem 34336 • Z —Recall Stored User Profile . The Z command resets the modem and recalls a profile of the modem configuration settings previously saved using the &W command. The profile is designated as profile 0 or profile 1 when it is saved using the &W command. • , —Pause . A comma causes the modem to pause for 2 seconds (or t[...]

89 5.0 Hayes Emulation Mode • ! — Initiate Flash. The ! command causes the Modem to go on-hook for 1/2 second. The command has the same effect as holding the switch-hook button on your telephone down for 1/2 second. Some PBX systems use a flash to transfer calls. • &F — Recall Factory Configuration. The &F command restores the Modem[...]

90 Modem 34336 Ring count Wait time before blind dialing Wait time for carrier/dial tone In addition, the &W command does not save stored phone numbers. • &Z — Store Telephone Number. The &Z command is used to store a telephone number dialed using the DS (dial stored number) command. The syntax is &Zm=n , where m specifies the m[...]

91 5.0 Hayes Emulation Mode 5.3.1 R EADING A ND S ETTING R EGISTERS Use the S command to read the value of a register or to change its value. To read the current value of a register, use the command S? , where the number of the register is specified between the S and the ?—for example, S9 ?. The decimal value of the register contents is displayed[...]

92 Modem 34336 • S3 — Carriage Return. Register S3 is effective for asynchronous operation only. Normally, the ASCII carriage-return value, 13, is used. • S4 — Line Feed. This register is effective for asynchronous operation only. The line-feed character follows the carriage return only when word result codes are selected (command V1). Line[...]

93 5.0 Hayes Emulation Mode If the guard time is zero, timing is not a factor. The three escape characters can occur with any timing relationship, but they must be consecutive. Be cautious when assigning small guard times. You may not be able to enter three characters fast enough, especially if the guard time is less than the time required to trans[...]

94 Modem 34336 5.4 Selecting Options In Hayes Mode In Hayes mode, options may be selected by using one of the following: • AT commands (Table 5-1) • The front panel • The Summary Setup feature The easiest way to change options in Hayes mode is to use the AT commands listed in Table 5-1 or the Modem’s front panel. The following guidelines ap[...]

95 5.0 Hayes Emulation Mode • If profile 0 is recalled as the active configuration, the LCD screens reflect the profile 0 configuration. • If profile 0 is changed by means of Hayes commands or via the Summary Setup feature and then saved, the changes made are reflected on the LCD and are effective for all modes. If you make option changes from [...]

96 Modem 34336 T able 5-1. Hayes Compatible Commands. COMMAND FUNCTION/EXPLANATION A Quick Answer No parameters. A/ Repeat Previous Command No parameters. B Bell/CCITT Compatibility Mode * B0 Selects CCITT V.22 mode. B1 Selects Bell 212A mode. C1 Modem displays OK; command has no other effect. This response instead of ERROR maintains a degree of co[...]

97 5.0 Hayes Emulation Mode T able 5-1 (continued). Hayes Compatible Commands. COMMAND FUNCTION/EXPLANATION I Product Code Or Checksum I0 Requests product code. I1 Requests checksum for the Modem’s software. (Only a portion of the checksum displayed via the front panel is displayed in decimal format.) I2 Requests verification of software checksum[...]

98 Modem 34336 T able 5-1 (continued). Hayes Compatible Commands. COMMAND FUNCTION/EXPLANATION S= Modify S Register Parameters are register and value to be written. S? Read S Register Parameter is the register number. T Tone Dialing No parameters. V Word/Digit Result Code V0 Result codes are transmitted as digits. V1 Result codes are transmitted as[...]

99 5.0 Hayes Emulation Mode T able 5-1 (continued). Hayes Compatible Commands. COMMAND FUNCTION/EXPLANATION Y Long-Space Disconnect* Y0 Disables long-space disconnect. Y1 Enables long-space disconnect. Z Recall Stored User Profile Z0 Resets modem and recalls stored user profile 0. Z1 Resets modem and recalls stored user profile 1. , (comma) Pause ?[...]

100 Modem 34336 T able 5-1 (continued). Hayes Compatible Commands. COMMAND FUNCTION/EXPLANATION &J Modem displays OK result code; command has no other effect. (The Modem is configured for A/A1 control or MI/MIC control via jumpers JP2 and JP3, as detailed in Appendix D .) &L Modem displays OK result code; command has no other effect. (The M[...]

101 5.0 Hayes Emulation Mode T able 5-1 (continued). Hayes Compatible Commands. COMMAND FUNCTION/EXPLANATION &T Test Commands &T0 Terminates a test in progress. &T0 must be the last command in a command line. &T1 Initiates a local analog loopback test. &T3 Initiates a local digital loopback test. &T4 Allows the local modem t[...]

102 Modem 34336 T able 5-1 (continued). Hayes Compatible Commands. COMMAND FUNCTION/EXPLANATION &Z Store Telephone Number Parameters are 0-9 (available memory locations). B Buffer Mode/Speed Conversion * 1 B0 Disables speed conversion. B1 Enables speed conversion. <$!B10> C MNP Class (Limit) * 1 C1 Limits operation to MNP class 1. C2[...]

103 5.0 Hayes Emulation Mode T able 5-1(continued). Hayes Compatible Commands. COMMAND FUNCTION/EXPLANATION N V.42 Mode * 1 N0 Disables error correction. N1 Enables mandatory mode for error correction. N2 Disables error correction. N3 Enables automatic mode for error correction. P V.42 Protocol * 1 P0 Selects LAPM protocol only. P1 Selects [...]

104 Modem 34336 T able 5-2. Hayes Mode Result Codes. DIGIT CODE WORD CODE MEANING 0 OK Command line executed without errors. 1 CONNECT Carrier detected at 0-300, 1200, or 2400 bps (basic code set). 2 RING Ringing signal detected (in answer mode). (When the Modem detects a ring, it sends a RING result code unless it is in the process of accepting a [...]

105 5.0 Hayes Emulation Mode T able 5-2 (continued). Hayes Mode Result Codes. DIGIT CODE WORD CODE MEANING 15 CONNECT 4800 Carrier detected at 4800 bps. 18 CONNECT 9600 Carrier detected at 9600 bps. 20 LINKING Modem is dialing numbers that are linked using the L (link) dial modifier. Note: Four additional word codes are BUFFER, MNP, V42, and V42 bi[...]

106 Modem 34336 T able 5-3. S Register Functions. (Only registers intended for user access are listed.) REGISTER RANGE UNITS DEFAULT DESCRIPTION S0 0-255 rings 1 Ring to answer on S1 0-255 rings 0 Counts number of rings S2 0-127 ASCII 43 Escape-code character S3 0-127 ASCII 13 Carriage-return character S4 0-127 ASCII 10 Line-feed character S5 0-127[...]

107 6.0 V .25 bis Autodialer 6.0 V .25 bis Autodialer For international compatibility, the Modem can function as a V.25 bis autodialer. In V.25 bis mode, the Modem is compliant with CCITT recommendation V.25 bis—an internationally recognized standard for serial automatic call origination and answering. The V.25 bis autodialer uses the dialing com[...]

108 Modem 34336 DTR D IALING IN V.25 BIS M ODE An alternative to using the V.25bis CRS command to dial a stored number is to use the DTR dialing option. With DTR dialing enabled, the autodialer will dial the number stored in the phone cell displayed in the front-panel AUTO- DIAL screen when DTR goes high for at least 50 ms. To enable V.25 bis DTR d[...]

109 6.0 V .25 bis Autodialer • DIC — Disregard Incoming Call. The DIC command instructs the autodialer not to answer an incoming call. The DIC command is cancelled when the CIC command is issued or auto-answer is enabled from the front panel. • PRN — Program Normal (Store Number) (Syntax: PRN<|>1;<|>5551212). The PRN command is [...]

T able 6-1. V .25 bis Autodialer Commands. COMMAND FUNCTION CIC Connect incoming call. CRN n Call request—dial number (n) entered on DTE keyboard. CRS m Call request—dial number stored in specified memory address (m). DIC Disregard incoming call. PRN m n Program normal—store number or dial string n in memory address m. RHA Switch to Hayes dia[...]

111 6.0 V .25 bis Autodialer T able 6-2. V .25 bis Dialing Parameters. (Table also applies to Dumb mode and Bell 208 operation) Characters that can be dialed: 0—9 Can only be tone dialed: A, B, C, D, #, and * L Links a phone number to another number to be dialed as an alternate when the primary number is busy or does not answer. See L - LINK in S[...]

6.3 Dialing Parameters Table 6-2 lists dialing parameters you can use with the CRN command to modify dialing operations. 6.4 V .25 bis Result Codes Table 6-3 explains the result codes, or responses, that are displayed on the DTE monitor during V.25 bis operation. 6.5 DTR Dialing In V .25 bis Mode An alternative to using the CRS command to dial a st[...]

113 7.0 Diagnostics 7.0 Diagnostics The troubleshooting information in this chapter applies to all Modem applications (all dialup and leased line modes), unless specifically stated otherwise. For specific test procedures, turn to one of the following sections in this chapter: • Section 7.7 — Local Modem Diagnostics • Section 7.8 — Remote Di[...]

114 Modem 34336 7.3 Physical Inspection The next step in isolating a defective component is inspecting the system. If you can trace the problem to a specific site, examine that site. Check the installation of the modem and DTE. Are all cables in good condition and fully connected? Are all components in the system receiving power? Inspect the system[...]

115 7.0 Diagnostics 7.5 How to Select and Activate T ests 7.5.1 F RONT -P ANEL C ONTROL Tests are accessed and activated in the same way options are selected: by using the LCD and front panel pushbuttons (as explained in Chapter 3). To find the LCD screen for a specific test, refer to the LCD flow chart (Diagnostic And Control Functions) at the end[...]

116 Modem 34336 D = Dial line occupied R = Ringing (R appears in same position as D.) S = Connection secured by security handshake (S appears in same position as D. S and D may flash alternately.) TR = Data Terminal Ready MR = Data Set Ready RS = Request to Send CS = Clear to Send TD = Transmit Data 9600, 4800, etc. = Data speed (idle—the Modem i[...]

117 7.0 Diagnostics The RX value is the local receive level of the incoming signal. The receive level range of measurement is from 0 to -43 dBm in 1.5-dBm increments. If the signal level is less than the carrier detect threshold, "<CD" is displayed. • Echo Characteristics Screen. Displays the characteristics of the echo portion of th[...]

118 Modem 34336 7.7 Local Modem Diagnostics Local modem diagnostics are for testing the Modem and its adjoining system. The tests are accessed from the main menu and are easily performed if the Modem is attached to DTE or an external BERT. 7.7.1 A NALOG L OOPBACK (ALB) T EST Analog loopback testing allows you to test the local modem and its associa[...]

119 7.0 Diagnostics In Hayes emulation mode only, initiate the ALB test using the command &T1 (preceded by AT). In any mode, initiate the ALB test using the modem’s front panel controls, explained in the following paragraphs. Make sure the modem is idle, the data rate is the same as the DTE’s data rate, and the DTR circuit is on. (If TR is [...]

120 Modem 34336 Figure 7-2. Analog Loopback Self-T est (ALBST). The SELFTEST screen is displayed, with ON and OFF as the possible selections. Select ON to activate the test. The EIA status screen is displayed while the test is being conducted. If ER is present on the front panel, data errors occurred. The ER indicator may flash on when the test is [...]

121 7.0 Diagnostics To run the test, go to the LCD MAIN MENU. From page 2 of the LCD MAIN MENU, select TEST. This takes you to screen 1 of the LOCAL TEST menu, where ST/E is visible as one of the selections. Select ST/E. The SELFTEST W/ERROR screen is displayed, with ON and OFF as the possible selections. Select ON to activate the test. The EIA sta[...]

122 Modem 34336 NOTE The ALBX test may result in errors or may fail altogether even where conditions are satisfactory for normal operation. The test channel presented to the modem during the ALBX test includes all impairments of both the inbound and outbound channels (ampli-tude distortion, delay distor-tion, noise, etc.). The main purpose of the A[...]

123 7.0 Diagnostics 7.7.5 E XTERNAL A NALOG L OOPBACK S ELF -T EST (ALXST) The external analog loopback self-test is available for 4-wire leased line mode only . The ALXST places the modem in analog loopback and causes data to be sent and received by an internal 511-bit pattern generator and receiver. No DTE or external BERT is necessary. As shown [...]

124 Modem 34336 To initiate the ALXST, use the Modem’s front-panel controls to go to the LCD MAIN MENU. From page 2 of the LCD MAIN MENU, select TEST. Go to the second page of the LOCAL TEST menu. Select ALXST. The ANALOG ST (EXT) screen is displayed, with ON and OFF as the possible selections. Select ON to activate the test. The EIA status scree[...]

125 7.0 Diagnostics Figure 7-5. Digital Loopback T est (DLB). The DIGITAL LOOPBACK screen is displayed, with ON and OFF as the possible selections. Select ON to activate the test. The EIA status screen is displayed while the test is being conducted. Ensure that test data is being generated and watch for data errors. By transmitting test data and co[...]

126 Modem 34336 7.8 Remote Modem Diagnostics The Modem performs two tests on compatible remote modems: remote digital loopback (RDL) and remote digital loopback self test (RDLST). If a problem is encountered and the local Modem passes all diagnostic tests, the local Modem can test the remote modem. Two (noncontiguous) REMOTE TEST screens are on the[...]

127 7.0 Diagnostics From page 2 of the MAIN MENU, select RMT. Then select TEST. From the REMOTE TEST menu, select RDL. From the REMOTE DIGIT LOOP screen, select ON to activate the test. The status screen is displayed as the test is being conducted. Make sure that test data is being generated and watch for data errors. By transmitting test data and [...]

128 Modem 34336 Figure 7-7. Remote Digital Loopback Self T est. P A TTERN GENERA TOR P A TTERN DETECTOR TRANSMITTER RECEIVER TRANSMITTER RECEIVER LOCAL MODEM REMOTE MODEM[...]

129 APPENDIX A: DB25 Pin Assignments Appendix A: DB25 Pin Assignments Desig- LCD Pin nation Function Indicator Source 1 AA Frame ground—not connected 2 BA Transmit data (TD) TD DTE 3 BB Receive data (RD) RD Modem 4 CA Request to send (RTS) RS DTE 5 CB Clear to send (CTS) CS Modem 6 CC Data set (modem) ready (DSR) MR Modem 7 AB Signal Ground (SG) [...]

130 Modem 34336 Appendix B: Quick Setup Configurations Table B-1 shows the complete default configuration for each of the Quick Setup modes. When you select a Quick Setup, the modem automatically sets all options as indicated in the table. The options are listed in the same order in which they appear on the LCD flow chart. See 2.0, Quick Start , fo[...]

131 APPENDIX B: Quick Setup Configurations T able B-1 (continued). Quick Setup Configurations. Default Settings Listed by Mode or Type of Operation V.25 bis 2-WIRE 4-WIRE BELL OPTION HAYES ASYNC 1 DUMB LEASED 2 LEASED 2 V.33 208 3 Misc. Address 999,999 999,999 999,999 999,999 999,999 999,999 999,999 Dialer Hayes V.25 bis/ OFF OFF OFF OFF OFF Mode A[...]

132 Modem 34336 T able B-1 (continued). Quick Setup Configurations. Default Settings Listed by Mode or Type of Operation V.25 bis 2-WIRE 4-WIRE BELL OPTION HAYES ASYNC 1 DUMB LEASED 2 LEASED 2 V.33 208 3 EIA RDL—DTE Options controlled Disable Disable Disable Disable Disable Disable Disable (continued) TM to EIA Normal Normal True True True True T[...]

133 APPENDIX B: Quick Setup Configurations T able B-1 (continued). Quick Setup Configurations. Default Settings Listed by Mode or Type of Operation V.25 bis 2-WIRE 4-WIRE BELL OPTION HAYES ASYNC 1 DUMB LEASED 2 LEASED 2 V.33 208 3 V.33 and Carrier Switched Switched 4 Switched Switched Switched Constant Switched Bell 208A/B options CTS RTS RTS 4 RTS[...]

134 Modem 34336 T able B-1 (continued). Quick Setup Configurations. Notes: 1 V.25 bis synchronous configurations (character- and bit-oriented) are the same as the V.25 bis asynchronous confiugration except as follows: • V.42 MODE is OFF • BUFFER is disabled • DATA FORMAT is synchronous • PARITY is ODD • RX SPACE DISCONNECT is disabled •[...]

135 APPENDIX C: Summary Setup Appendix C: Summar y Setup C.1 Introduction to Summary Setup Summary Setup is designed to allow experienced users to quickly change option settings for any mode. There are three Summary Setup screens: SETUPS, AT PROFILES, and S-REG. They are briefly described on the next page. Because the screens show numerical codes w[...]

The AT PROFILES screen allows you to access and change the Hayes mode user profiles (profile 0 and profile 1). 136 Modem 34336 The SETUPS screen allows you to change all Modem options, including those that can be accessed through the front-panel LCD and those that can only be accessed or changed through Summary Setup. MAIN MENU <1> TALK QUICK[...]

137 Appendix C: Summary Setup C.2 SETUPS Screen Only part of the SETUPS screen can be displayed at any one time. The full screen is displayed below next to the numbers 1, 2, and 3. To make configuration and viewing easier, the screen is broken down into a number of sections. Use the front-panel pushbuttons to move around within the SETUPS screen (s[...]

138 Modem 34336 Primary Options: addr 999 999 Group Unit address address Figure C-2. How to move the cursor in the SETUPS screen using the pushbuttons. Dial Line Options: dial 11111002210 Pulse dialing rate (pulses per sec): 0=10, 1=20 Wait for carrier (sec): 0=30, 1=45, 2=60, 3=75 T1 timer (sec): 0=0, 1=0.3, 2=0.8, 3=1.6, 4=3.0 Carrier detect leve[...]

139 Appendix C: Summary Setup V .42 ERROR CORRECTION OPTION: NOTE “V42 <1>” and “V42 <2>” are displayed to help indicate the relative positions of individual options across the LCD. V42 <1> V42 <2> 00335311 200001021 Link flow control: 0=disable, 1=enable, 2=slaved DCE pass-through flow control: 0=disable, 1=enable S[...]

140 Modem 34336 DA T A PUMP OPTIONS: NOTE “pump1” and “pump2” are displayed to help indicate the relative positions of individual options across the LCD. pump1 pump2 2002103010100011110 208 phase detection: 0=normal, 1=compensated V.32 mode: 0=V.32 extended, 1=V.32 bis Rate renegotiation (RRP): 0=disable, 1=enable Turnaround delay: 0=on, 1=[...]

141 Appendix C: Summary Setup MISCELLANEOUS OPTIONS: NOTE “misc1” and “misc2” are displayed to help indicate the relative positions of individual options across the LCD. The dashes (-) are shown in this example to help indicate the relative positions of these three particular options across the LCD. misc1 misc2 1230000 0100 –– – Multi[...]

142 Modem 34336 C.3 A T PROFILES Screen From the AT PROFILES screen you can select a Hayes mode configuration profile (either 0 or 1). Only part of the profile can be displayed at one time. The selected profile is used as the active configuration and is also designated as the default user profile. • Press pushbutton 1 to select profile 0. • Pre[...]

143 Appendix C: Summary Setup C.4 S-REG Screen The S-REG screen may be used to read or change the value stored in an S register. For more information, see 5.3, S Registers . NOTE Not all S registers are intended for user access. Do not change the value of an A register if you do not know the register’s function. Doing so can adversely affect the [...]

144 Modem 34336 Appendix D: Jumpers W ARNING Jumpers should be switched only by qualified service personel. For most applications, there is no need to reset the modem’s internal jumper switches. However, a jumper switch will have to be reset if you need to do any of the following: • Connect frame ground to signal ground. • Switch from A/A1 co[...]

145 Appendix D: Jumpers Figure D-1. Modem Circuit Boar d—Jumper Locations. JP7 JP2 JP3 JP1 JP6 JP5 JP4 JP8[...]

146 Modem 34336 T able D-1. Jumper Switch Functions. JUMPER(S) Pins 1 and 2 connected Pins 2 and 3 connected JP1 Frame and signal Frame and signal ground connected ground not connected JP2 -12/-24/-48 VDC operation JP3, JP4 -12/-24/-48 VDC operation (Set to same position) JP5, JP6 A/A1 control MI/MIC control (Set to same position) JP7 Pin 25 used f[...]

147 NOM Statement NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY ST A TEMENT INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura. 3. Todas las advertencias [...]

148 Modem 34336 10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas u otros aparatos (incluyendo amplificadores) que producen calor. 11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como se indiq[...]

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