Modem LED Indicators, Busy Switch | Multi-Tech Systems MT2834MR6

Chapter 1 - Introduction

1.8Modem LED Indicators

The MT2834MR6 has five LED indicators per modem:


TD	Transmit Data. This LED blinks when data is being transmitted, on for a space, off for a mark. The
	state of this LED matches that of the TD circuit on Pin 2 of the RS-232C interface.
RD	Receive Data. This LED blinks when data is received, on for a space, off for a mark. The state of
	this LED matches that of the RD circuit on Pin 3 of the RS-232C interface.
CD	Carrier On. This LED lights when a valid carrier tone has been detected.
Speed	Speed. This LED blinks at different rates to indicate the speed of the data connection:
		Data Rate (bps)		LED State
	12000		or less	Off
	14400		or 16800	Slow blink rate
	19200		or 21600	Medium blink rate
	24000		or 26400	Fast blink rate
		28800 or more		On
OH/OOS	Off Hook/Out of Service. This LED lights when the modem is off hook, which occurs when the
	modem is dialing, online, or answering a call. The LED flashes when the modem is in the busy-
	out or out-of-service state.

Note: The PS4800 modem rack power supply has one LED that indicates the presence of all supply voltages.

1.9Busy Switch

The MT2834MR6 has six two-position Busy switches on the front panel. Each switch can be used to create a “busy-out” (OOS) condition for one of the six on-board modems (i.e., modem A, B, C, D, E, or F).

To place a modem in the Busy condition, move the appropriate Busy switch to the right. The selected modem goes off-hook, its OH/OOS LED begins to flash, and incoming calls to this modem get a busy signal. If you suspect a problem with a particular modem, you can use the Busy switch to have an optional device (such as a “hunt group”) that looks for a non-busy line to perform a rollover to the next available modem while you check the status of the Busy modem.

Note: The MultiModemManager can perform the same function using software.

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Multi-Tech Systems MT2834MR6 manual Modem LED Indicators, Busy Switch, Speed, Data Rate bps LED State

Contents

User Guide Trademarks Revision Date Description Contents Registers Warranty & Service Index 116 Introduction Manual Organization Introduction Description FCC Regulations for Telephone Line Interconnection FCC Fax Update Canadian Limitations Notice Technical Specifications Fax Carrier DiagnosticsBell 103/113 300 bps Power Supply Data Rate bps LED State Modem LED IndicatorsBusy Switch Speed Safety Warnings 10 MT2834MR6 Installation Notes Dialing and Answering Dial-Up Handshaking Details Dial-Up Automatic Answering Call Termination AT Commands Modes of Operation Working with AT Commands Command Editing Command Structure AT Commands Serial port baud rate Baud adjustFlow control disabled Modem baud rate Go back online Force answer modeAlternate out-of-band escape sequence Escape sequence selection = phone number Dialing CommandsDefault none Dial Pulse or Tone Dialing Dial Modifier CommandsDefault P Default R0 Or 4 through 255 seconds International models ATDT1028806127853500 $123456789 NdNe Number Linking = 0 or = 1 or Default none Phone Number Memory Commands P9,T14089876543 T14082345678 = 0, 8, or Configuration Storage and Recall CommandsDefault &W1 Default &F8 AT&F9&W0 AT&W1 defaultATZ AT&F8&W0 Modem Response Result Code Commands Default Default &A0Result Codes and Call Progress Selection DCn AT Command Control = 0 or Default %DC0 Online Connection Commands#An Auto Speed Detection Default #A0 Default B0 CDn Cleardown at Disconnect = 0 or Default &CD0 DTn Dtmf Detection = 0 or Default DT0#Fn Fallback Modes = 0, 1, or Default #F2 G2 U.K. models only Default &G0 models outside U.KDefault *H0 Default &P0 Models outside U.K Issued #T0 disables TCM#T1 enables TCM Default Y0 V.34 Commands Default &R1 RS-232 Interface CommandsDefault &C1 Default &D2 S1 allows DSR to act normally, that is, to follow CD Default &S1Go high again S0 forces DSR high #Ln Error Correction Modes Default #L0 Error Correction and Data Compression CommandsDefault &E1 Default &E15 $En Error Correction at 300 bps = 0 or Default $E0 $An Autoreliable Buffering = 0 or Default $A0$Rn Retransmit Count = 0 or Default $R0 Speed Conversion Commands $SB2400 $SBn Serial Port Baud Rate = speed Default $SB57600$SB300 $SB1200 Immediate Action Commands Rate Renegotiation Flow Control Disable Flow Control CommandsBSn Maximum Reliable Block Size = 0 or Default &BS1 $EBn Asynchronous Word Length = 0 or Default $EB0 Default &E10 Default &E6Default &E8 Non-Error Correction Mode Flow Control = 12 or Default &E13#Xn Number of Xoff Characters Sent = 0 or Default #X0 Pacing Computer-Initiated Flow Control Escape Sequences Atcr Remote Configuration Escape Sequence Remote Configuration Commands Line Probe Commands Diagnostic Commands Registers Registers Return Character Default 13 MDefault 10 J Default 8 H Range 1-255 U.S.A Time for Carrier Abort TimerDefault 45 North America and International Unit 1 second Maximum S11 value is 255 ms 255 units Registers Registers Reading and Assigning S-Register Values Examples of Assigning ValuesExamples of Reading Values AT Commands Affecting S-Registers Error Correction, Data Compression & Speed Conversion Error Correction, Data Compression, and Speed Conversion How V.42 Detects and Corrects Errors MNP Classes Data Compression 3 #L2 Command V.42 Mode Select Command #L1 #L0 Command 2 #L1 Command Modes of Operation Non-Error Correction Mode &E0Reliable Mode &E2 Autoreliable Mode &E1 Flow control and pacing Flow Control Modem-Initiated Flow Control 1 XON/XOFF Flow Control &E5Hardware Flow Control &E4 Hewlett Packard ENQ/ACK Pacing &E9 Non-Error Correction Mode Flow Control &E10 and &E11Pacing &E13 1 XON/XOFF Pass-Through &E7 10.3 XON/XOFF Pass-Through 10.1 V.42 Error Correction ModesNon-Error Correction Mode Flow Control Modem-Initiated Flow Control Speed Conversion MNP Error CorrectionLAP-M Error Correction Result Codes Modem Baud Rate $MB Baud Adjust $BA Serial Port Baud Rate $SB Autoreliable Fallback Character $F Related CommandsAutoreliable Buffering $A Maximum Block Size &BS 13.5 V.42 Error Correction at 300 bps $E SummaryRetransmit Count $R Testing & Troubleshooting Testing and Troubleshooting Local Analog Loopback Test V.54 Loop Test Procedure Remote digital loopback test Remote Digital Loopback Test V.54 Loop Local digital loopback test Local Digital Loopback Test V.54 Loop Warranty & Service Multi-Tech Systems, Inc. Warranty & Repairs Policies Warranty2 U.S. and Canadian Customers International Distributors International Customers outside U.S.A. and Canada Repair Procedures for U.S. and Canadian Customers Repair Procedures for International CustomersRepairs Technical Support Internet SiteCountry Telephone Appendices Appendix a Ascii Conversion Chart Dial Pulses Appendix B Figure B-2. Standard Dtmf frequencies Tone Dial Frequencies Result Code Summary Appendix C Standard AT Result Codes &Q1 Register Unit Range Default Description Appendix DRegister Summary S34 AT Command Summary Command Values DescriptionAppendix E CDn 100 101 102 103 104 105 RS-232C Interface Specifications Signal Information Negative PositiveAppendix F Transmitted Data TD Pin 2 To modem Functional Description of the RS-232C Signals Test Voltage +V Pin From modem External Transmit Clock XTC Pin To modem Appendix G Cable and Connector Diagrams Introduction to MultiTech Escape Methods Appendix H Escape Method 1 +++ATCR How to Select an Escape Method Aborting an Escape Sequence Registers and Escape Sequence Introduction to Remote Configuration Basic ProcedureSetup Changing the Remote Escape Character Changing the Passwords Index Index 118 119 120 121 122 S000326A