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14-5 Using x2
Limiting the Lowest Possible Connect Speed
The &U command allows you to limit the lowest possible connect speed.
If a remote modem attempts to connect to your Courier with x2 at a speed
lower than &U, your Courier with x2 will not allow it to connect.
To limit the Use this command
Where x is
Lowest possible
connect speed
AT&U=x A value from 0 to 32
Limiting a Range of Possible Connect Speeds
By setting &N and &U values, you can limit the range of speeds at which
your Courier with x2 connects. If a remote modem does not connect to
your Courier with x2 at a range between the speeds designated by the &N
and &U commands, your Courier with x2 will not allow it to connect.
Note: The link speed associated with the &U argument cannot be greater
than the link speed associated with &N argument.
Use the following table to understand the relationship between &U and
&N commands:
If &U And &N Then your modem
Equals
zero
Equals zero Connects at the highest possible
speed.
Is greater than
zero
Connects at the &N speed only.
Is greater
than zero
Is greater than
zero and greater
than &U
Connects at the highest possible
speed in the range from &U to &N.
Table 14.2 Constraints on Link Speed
- Courier™ I-modem® 1
- Getting Started Guide 1
- Final Draft 1
- Read this First 3
- Contents 4
- Chapter 1 10
- Introduction 10
- Optional Built-in NT-1 12
- Optional Analog Device Jack 12
- TurboPPP 12
- Rate Adaptation 12
- Chapter 2 16
- The I-modem and ISDN 16
- What is ISDN? 17
- Benefits of ISDN 17
- The ISDN Basic Rate Interface 17
- Physical Appearance 17
- B-channels and D-channels 18
- Required Components 19
- How Does the I-modem Fit In? 19
- S/T Interface 20
- Internet Access (TurboPPP) 21
- Chapter 3 24
- Ordering ISDN Service 24
- Requesting ISDN Service 25
- Chapter 4 28
- Installing Your 28
- Internal I-modem 28
- Package Contents 29
- Important! 30
- Default Jumper Settings 31
- Windows 95 Users 32
- I-modem Model S/T 37
- 1 Run HyperTerminal 38
- 4 Change any properties and: 40
- Chapter 5 43
- External I-modem 43
- ISDNTelephone 45
- Chapter 6 47
- Service Profile Identifiers 48
- Terminal Endpoint Identifier 48
- Configuring the I-modem 49
- Chapter 7 57
- Configuring With 57
- AT Commands 57
- Preparing to Send AT Commands 58
- 4 Set up the DATA B-channel 61
- 2 Make a test data call 64
- Analog Device Port 65
- Data Port 65
- Chapter 8 67
- Configuring Your Courier 67
- For Windows 95 67
- Files Needed By Your I-modem 70
- If Dial-Up Networking Do this 72
- Support” to install Dial-Up 72
- Networking 72
- Is not listed Go to Step 3 72
- 4 Click Windows Setup tab 73
- 7 Click OK 74
- Windows 95 8-9 75
- Settings” 76
- 7 Click Finish 79
- 9 Click OK, and OK 79
- Windows 95 8-15 81
- TCP/IP Settings window 81
- Chapter 9 83
- Configuring Your 83
- I-modem For Macintosh 83
- 2 Click PPP and More… 84
- Configuring ConfigPPP Dialer 85
- Dialing With ConfigPPP 85
- Chapter 10 87
- What You Need 88
- Configuring Your I-modem 88
- If You Are Using MS-DOS 89
- For Internal Couriers Only 89
- If You Are Using OS/2 90
- Chapter 11 93
- Configuring TurboPPP 93
- With AT Commands 93
- Making Calls With ML-PPP 94
- Connection With ML- PPP 95
- Pass-through Compression 98
- Auto Mode Compression 98
- Turbo Mode Compression 98
- Chapter 12 101
- Configuring Your I-modem 101
- With DIP Switches and Jumpers 101
- Default DIP Switches 104
- Locating DIP Switches 104
- Locating Jumpers 105
- Changing Jumper Settings 106
- Chapter 13 108
- Viewing LEDs 108
- Viewing LEDs 13-3 110
- Chapter 14 111
- Using x2 111
- Obtaining x2 112
- How x2 Works 113
- Controlling x2 113
- x2 Server Mode 113
- Controlling Link Speeds 114
- New x2 Result Codes 118
- Numeric Alphanumeric 119
- I-modem Command Reference 120
- Appendix A 121
- Other I-modem Features 121
- Period Dial Modifier 122
- PCSDL vs. XMODEM 122
- Forcing Analog Calls 123
- Appendix B 125
- Technical Information 125
- Modulation 126
- Additional Specifications 128
- Ringer Equivalence 129
- Power Consumption 129
- Serial Ports 129
- The EIA-232 Interface 130
- Minimum Requirements 131
- Flow Control Requirements 131
- For Macintosh Computers 132
- I-modem’s serial port: 133
- Choosing a Serial Cable 135
- Notes for Macintosh Users 135
- Notes for Mainframe Users 136
- Macintosh 136
- Appendix D 137
- Warranty 137
- Telephone Support 140
- North America 140
- Europe, Middle East, Africa 140
- All Other Locations 140
- Software/Firmware Updates 141
- Hardware Support 141
- FCC Registration 143
- IC (Industry Canada) 144
- UL Listed Accessory 145
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