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MultiModemII User Guide
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2. Dial the remote modem and establish your online connection.
3. Type the escape sequence +++AT and press ENTER to bring your modem into
online command mode.
4. Type AT&T3 and press ENTER. Once you receive an OK message from your mo-
dem (if responses are enabled), your modem is placed in digital loopback mode.
5. Have someone enter data from the remote keyboard. For this test, typing multiple
uppercase U characters is a good way to send an alternating test pattern of binary
ones and zeros. The data received by your modem enters its analog receiver, is
converted to digital data, is reconverted into analog, and then is transmitted
back to the remote modem. Your modem passes this test if the data received on
the remote monitor is the same as the data entered from the remote keyboard.
6. To exit the test, turn off the modems.
Note: You can also start and stop a local digital loopback test by using the front panel
LCD and buttons. See “Diagnostic Options Trunk” in Chapter 3.
Back-to-Back Test
This test verifies proper operation by connecting two MT5600BLs back to back using
an RJ-11 cable. By using an MT5600BL that is known to be good, you can test a second
MT5600BL that is suspect.
Computer or Terminal
Digital Analog
Local MultiModem
MultiModem under test
DigitalAnalog
UUUUUUUUUUU
UUU
JumperRJ-11 cable
Figure C-4. Back-to-back test.
1. Connect two MT5600BLs by plugging an RJ-11 cable into their LEASED jacks.
2. Set the terminal and modems to the same serial port speed. For instance, if you
are using a terminal that is limited to 9600 bps, set the modems to 9600 bps by
sending the command AT$SB9600&W0 to each modem.
3. Following the instructions in Chapter 7, set both modems to two-wire leased-
line mode. One should be set as the originate modem and the other as the an-
swer modem, but it does not matter which is which.
4. Turn on both units and wait for carrier detect (CD).
5. On the modem under test, short pins 2 and 3 of the RS-232C connector with a
paper clip or other metal device.
- Model MT5600BA 1
- Model MT5600BL 1
- FCC Part 15 3
- Industry Canada 3
- Chapter 1: Introduction 4
- Chapter 2: Quick Start 4
- Chapter 6: Callback Security 5
- Chapter 8: Solving Problems 5
- Contents 7
- Introduction 10
- Product Description 10
- Features 10
- 1 Introduction 11
- Related Manuals 12
- Quick Start 13
- What You Will Need 14
- Safety Warnings 14
- RS232 Connection 15
- Dialup Connection 15
- Adding the Modem to Windows 17
- Trio DataComm 19
- Windows HyperTerminal 20
- Windows Terminal 21
- Step 5: Send a Fax 22
- References 23
- Using the 25
- Front Panel 25
- Modem Configuration 26
- LED Indicators 26
- Liquid Crystal Display (LCD) 27
- Menu Overview 28
- 3 Using the Front Panel 29
- Status Trunk 29
- Basic Options Trunk 30
- Advanced Options Trunk 31
- Diagnostic Options Trunk 32
- Caller ID Options Trunk 33
- Menu Options 34
- Basic Options 35
- Advanced Options 36
- Remote Configuration Options 37
- Diagnostic Options 38
- Phone Number Memory Options 38
- Caller ID Options 38
- AT Commands 39
- S-Registers & 39
- Result Codes 39
- S-Registers 57
- Configuration 65
- Basic Procedure 66
- 5 Remote Configuration 67
- Callback 69
- Security 69
- AT Command Method 70
- Front Panel Method 71
- At Command Method 71
- Calling Procedure 73
- Callback Security Commands 73
- Callback Assignments 75
- Leased Line 77
- Operation 77
- Two-Wire Setup 78
- Four-Wire Setup 79
- 7 Leased Line Operation 81
- Problems 83
- None of the Indicators Light 84
- 8 Solving Problems 85
- Data Is Being Lost 89
- Appendixes 91
- FCC Part 68 Telecom 92
- Fax Branding Statement 93
- Canadian Limitations Notice 94
- Commission Decision CTR21 94
- A Regulatory Compliance 95
- B Technical Specifications 97
- Appendix C: Loopback Tests 99
- Test procedure 100
- Back-to-Back Test 102
- C Loopback Tests 103
- Technical Support 104
- To Download a File 105
- About the Internet 106
- Ordering Modem Accessories 107
- Upgrade Overview 108
- Multi-Tech Web Site 109
- Multi-Tech BBS 109
- E Upgrading the Modem 111
- Appendix F: Cable Pinouts 112
- Leased Line Pinouts 113
- MultiModemII User Guide 114
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