Lenovo ThinkPad T21 English - 46L4325 - ThinkPad T20, T21User's Reference guid
Lenovo ThinkPad T21 Manual
View all Lenovo ThinkPad T21 manuals
Add to My Manuals
Save this manual to your list of manuals |
Lenovo ThinkPad T21 manual content summary:
- Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 1
- Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 2
supports, be sure to read the general information under "Important safety instructions" on page v and "Notices errors. IBM Authorized Dealer or your IBM Marketing Representative. © Copyright International Business Machines Corporation 2000. All rights reserved. Note to U.S. Government Users - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 3
1. System overview 1 Features 2 Specifications 5 Using your online user's guide 7 Starting BIOS Setup Utility 8 Chapter 2. Protecting your computer 11 Using passwords 12 Power-on password 12 Screen saver password 12 Hard-disk passwords 13 Windows password 13 Supervisor password 14 - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 4
and notices 45 Notices 47 Year 2000 readiness and instructions 47 Trademarks 48 Electronic emission notices 49 Telecommunication notices 51 Product notice requirements 54 Notice for Australia 54 Notice for New Zealand 54 Notice for European Union countries 55 iv IBM ThinkPad T20 User - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 5
Turn everything OFF. First, attach all cables to devices. First, remove the power cord from the outlet. Attach the signal cables to receptacles. Remove signal cables from receptacles. Attach the power cord to an outlet. Remove all cables from devices. Turn the device ON. © Copyright IBM - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 6
. Do not put the battery pack in trash that is disposed of in landfills. When disposing of the battery, comply with local ordinances or regulations and your company's safety standards. In the United States, call IBM at 1-800-IBM-4333 for information on disposal. vi IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 7
have closed the cover. Never use the computer when the cover is open. Remove the main battery pack of the computer also. The certain circuit of the system still exists even if the power seems to be off. Do not forget to remove the ac adapter and the battery pack. Important safety instructions vii - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 8
are present after washing, get medical care. CAUTION: To reduce the risk of fire, use only No. 26 AWG or larger (thicker) telephone cable. viii IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 9
radiation exposure. Class 1 laser products are not considered hazardous. The design of the laser system and the CD-ROM or DVD-ROM drive ensures that there is no exposure to laser radiation above a Class 1 level during normal operation, user maintenance, or servicing. Important safety instructions ix - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 10
Some drives contain an embedded Class 3A laser diode. Note this warning: DANGER Emits visible and invisible laser radiation when open. Avoid direct eye exposure. Do not stare into the beam or view it directly with optical instruments. Save these instructions. x IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 11
your computer. Only an authorized IBM ThinkPad repair technician should disassemble and repair your computer. Do not scratch, twist, hit, or push the surface of your computer display. Do not place any objects between the display and the keyboard or under the keyboard. Do not pick up or hold - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 12
operating cellular phone on the computer. The phone might cause malfunction in the computer system. Do not hard-mount your computer in a vehicle or anywhere that it is subject to strong vibration. Do not crush, drop, or physically punish the external or removable hard disk, diskette, or CD-ROM drive - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 13
activity and battery charge level. Extended contact with your body, even through clothing, could cause discomfort or, eventually, a skin burn. ThinkPad do's Treat your computer like precision electronic machinery. When installing your hard disk, diskette, or CD-ROM drive, follow the instructions in - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 14
the ThinkPad battery power-saving modes: - Screen blank - Standby - Hibernation For more information, refer to the online user's guide. Decrease the brightness of the LCD. Use power management. Each operating system comes with its own power management system. xiv IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 15
Whenever the internal serial devices-the modem, the serial port, and the infrared port-are not in use, stop the supply of power to them. If you will not be using the computer for a long period, remove the battery pack and keep it in a cool place. Handling the ThinkPad computer xv - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 16
xvi IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 17
Chapter 1. System overview Features 2 Specifications 5 Using your online user's guide 7 Starting BIOS Setup Utility 8 © Copyright IBM Corp. 2000 1 - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 18
drive Display The color display uses TFT technology: Resolution: - LCD: Up to 1024-by-768, depending on the model - External monitor: Up to 1600-by-1200 Brightness control Keyboard 84-key, 85-key, or 89-key TrackPoint Fn key function ThinkPad Button Volume Buttons ThinkLight 2 IBM ThinkPad T20 User - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 19
Features and specifications Diskette drive To get the best performance from your diskette drives, use high-quality diskettes (such as IBM diskettes) that meet or exceed the following standards: 1-MB, 100 2-MB, 2HD, 3.5-inch diskette: - ANSI X3.171 - ISO 9529 - ECMA 125 Chapter 1. System overview 3 - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 20
if the modem Mini-PCI Card or the Combo Mini-PCI Card is installed) Ethernet connector (available if the Ethernet Mini-PCI Card or the Combo Mini-PCI Card is installed) UltraPort connector to support an optional IBM digital camera Video-out connector Ultrabay 2000 4 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 21
, 31.3°C (88° F) Note: When you charge the battery pack, its temperature must be at least 10°C (50°F). Relative humidity: - Operating with no diskette in the drive: 8% to 95% - Operating with a diskette in the drive: 8% to 80% Heat output 56 W (191 Btu/hr) maximum Chapter 1. System overview 5 - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 22
Specifications Electrical (ac adapter) Sine-wave input at 50 to 60 Hz Input rating of the ac adapter: 100 to 240 V ac, 50 to 60 Hz Lithium-ion battery pack Nominal voltage: 10.8 V dc Capacity: 3.6 AH 6 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 23
Communicate Home and travel Enhancements Maintenance and upgrades Security Problem-solving How to reach IBM If you are logged on to the Internet, click one of the Internet portal buttons in Access ThinkPad. Get help and user support. Update software. Find business solutions. Learn about accessories - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 24
the date and time. Password: Set a password. Startup: Set the startup device. Restart: Restart the system. Note: You can set parameters more easily by using the ThinkPad Configuration Program. For more information on this program, refer to the online user's guide. To start IBM BIOS Setup Utility, do - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 25
exit from the submenu. If you are in a nested submenu, press Esc repeatedly until you reach the IBM BIOS Setup Utility menu. Note: If you need to restore the settings to their original state as of the Change the option you want; then press Enter. Your computer restarts. Chapter 1. System overview 9 - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 26
Starting BIOS Setup Utility 10 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 27
Chapter 2. Protecting your computer Using passwords 12 Power-on password 12 Screen saver password 12 Hard-disk passwords 13 Windows password 13 Supervisor password 14 Network password 14 Passwords and standby mode 14 Using the locks and the security screw 15 Attaching the mechanical lock - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 28
users. By turning your computer off and then on again, an unauthorized user could restart Windows without knowing your screen saver password-unless you have also set a power-on password. To set a screen saver password, refer to the online user's guide. 12 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 29
to an IBM reseller or marketing representative to replace the hard-disk drive. A fee will be charged for parts and service. To set a hard-disk password, refer to the online user's guide. Windows password When you start your ThinkPad computer and the Windows operating system opens, Windows will - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 30
a power-on password or a supervisor password (if one is set). Any hard disk for which you have set a hard-disk password is then unlocked automatically. For information on hard-disk passwords for a hard disk in a docking station, refer to the online user's guide. 14 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 31
. Refer to the instructions provided with the mechanical hard-disk drive from being removed. To replace the coin screw with the security screw, do as follows: 1. Turn off the computer; then disconnect the ac adapter and all cables from the computer. 2. Remove the screw with a coin; then install - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 32
your computer from being stolen. It is effective only when the supervisor password is set. If you use this option for security, you need to enable RFID security after installing it into your computer. For more information, refer to the online user's guide. 16 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 33
Solving computer problems Troubleshooting 18 Error codes or messages 18 No error codes or messages 22 Power switch problem 22 Input problems 23 Standby or hibernation problems 25 LCD problems 28 Battery problems 30 Hard-disk-drive problems 31 Software problems 32 Other problems 34 Testing - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 34
the normal operation. The hard disk is not working. Make sure that the hard-disk drive is attached firmly. Run the BIOS Setup Utility (refer to "Starting BIOS Setup Utility" on page 8); then make sure that the hard-disk drive is not disabled in the Startup menu. 18 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 35
before turning the computer on, reinstall it. Then test the memory with PC-Doctor. The system battery is dead. Replace the battery and run the BIOS Setup Utility (refer to "Starting BIOS Setup Utility" on page 8) to verify the configuration. If you still have a problem, have the computer serviced - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 36
Hardware troubleshooting Message 0270: Real time clock error 0271: Date and time error 0280: Previous boot incomplete 02D0: System cache error 02F4: EISA CMOS not writable 02F5: DMA test failed 02F6: Software NMI failed 02F7: Fail-safe timer NMI failed The power-on password prompt appears. The hard - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 37
Hardware troubleshooting Message Hibernation error Operating system not found Fan error EMM386 Not Installed-Unable to Set Page Frame Base Address CardBus Configuration Error-Device Disabled Cause and action The system configuration changed while your computer was in hibernation mode, and your - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 38
serviced. Power switch problem Problem The system freezes, and you cannot turn off the computer. Cause and action Turn off the computer by pressing and holding the power switch for 4 seconds or more. If the system is still not reset, remove the ac adapter and the battery pack. 22 IBM ThinkPad - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 39
reinstall IBM PS/2 TrackPoint driver. Refer to the Software Selections CD for installing the driver. See the mouse driver in Device Manager, and make sure that the IBM PS/2 TrackPoint driver is installed. Make sure you followed the instructions correctly when you installed Windows with the power - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 40
the keyboard/mouse cable from the computer and make sure that the keyboard operates properly. If the built-in keyboard works, there is a problem with either the cable or with the keyboard. Try using a different keyboard/mouse cable or an external keyboard. 24 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 41
Hardware troubleshooting Standby or hibernation problems Problem The computer enters standby mode automatically. The computer enters standby mode immediately after POST (the standby indicator turns on). The critical low-battery error appears, and the computer immediately turns off. The LCD remains - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 42
troubleshooting Problem When you are using the port replicator, resuming normal operation windows. 7. Restart the computer by turning it off and on again. Check whether any option has been selected to disable your computer from entering standby or hibernation mode. 26 IBM ThinkPad T20 User - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 43
Hardware troubleshooting Problem The computer does not enter standby mode after the interval set on the timer under Windows 98 or Windows NT. Cause and action For Windows 98: The generic CD-ROM or DVD-ROM driver for Windows 98 accesses the internal CD-ROM drive or DVD-ROM drive every 3 seconds to - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 44
Hardware troubleshooting Problem The Fn+F12 key combination does not make the computer enter hibernation mode. Cause and action Enable hibernation mode as follows: For Windows 98: 1. Start the ThinkPad Configuration Program 2. Click Power Management. 3. Click the Hibernation tab. 4. Click the - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 45
in the Settings window. 7. Make sure the output is displayed correctly. Make sure that the operating system and the application program are installed and configured correctly. If they are, have the computer serviced. Press and hold the power switch for 4 seconds or more to turn off your computer - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 46
and recharge the battery pack. If your battery's operating time is still short, use a new battery pack. The surge protector in the battery pack might be active. Turn off the computer for one minute to reset the protector; then turn on the computer again. 30 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 47
hot. If the battery feels hot, remove it from the computer and allow it to cool to room temperature. After it cools, reinstall it and recharge the battery. If it still cannot be charged, have it serviced. Hard-disk-drive problems Problem The hard-disk drive makes a rattling noise intermittently - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 48
minimum memory required for the application. Refer to the manuals supplied with the application. Check that the application is designed to operate with your operating system. Check that other applications run correctly on your computer. Check that the necessary device drivers are installed. Check - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 49
Hardware troubleshooting Problem While you are installing Windows 95, the system automatically reboot, showing a message, "Getting ready to run Windows 95 for the first time..."; then screen color becomes abnormal and the system halts. Cause and action If you install the Windows 95 as Typical ( - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 50
are working under battery power, replace the battery with a fully charged one or change your power source to ac power. If the problem persists, press and hold the power switch for 4 seconds or more; this forces the computer to turn off. Refer to the Startup menu of the IBM BIOS Setup Utility (refer - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 51
that it has found no problems, consider running additional tests in PC-Doctor. If you are preparing to contact IBM for support, be sure to print the test log so that you can rapidly provide information to the help technician. Backing up your system Backing up your system configuration When you add - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 52
Programs, Accessories, System Tools, and Backup. 3. Click Backup. Make sure that the Create a new backup job button is marked in the Microsoft Backup window. Click OK. The Backup Wizard will guide you through backing up some or all of the files on your hard disk. 36 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 53
the CD-ROM or DVD-ROM drive. 7. When you receive a message saying that the recovery process is complete, remove the Recovery CD Boot Diskette from the diskette drive. 8. Select Restart. Your computer will restart with the original preloaded operating system. Chapter 3. Solving computer problems 37 - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 54
driver that was installed from the Software Selections CD and that has an uninstall entry in the Add/Remove Program list. Advanced Functions - Change Settings You can select options such as where to access the Software Selections CD and how to display information about software. 38 IBM ThinkPad T20 - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 55
drivers on the system and install the ones you want. The page may also contain a readme for the driver you are installing; if so, be sure to read it before starting installation Software Selections CD and program onto your hard disk, and then install software and drivers without the CD. - Read the - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 56
are not covered: Replacement or use of non-IBM parts or nonwarranted IBM parts Configuration of BIOS as part of an installation to device drivers Installation and maintenance of network operating systems (NOS) Installation and maintenance of application programs 40 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 57
Getting service ThinkPad Web site On the World Wide Web, the IBM Personal Computing Web site has up-to-date information about IBM products and support: http://www.ibm.com/pc You can find support information for your IBM products, including supported options, on the IBM Personal Computing Support - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 58
sheets Option list To prepare for your call to IBM, make a copy of this page and the next one and, on the copy, fill in the blanks with information about your computer. DIMM _____MB Battery pack Hard disk drive _____GB Docking station _____model PC Cards _____MB Port replicator PC Card - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 59
as quickly as possible. Type of problem: Continuous Intermittent Error code: Operating system and version, if available: Windows Version______ Application programs running at the time of the problem: Problem symptom (describe in detail): Can the problem be reproduced? Yes No If yes, describe - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 60
Getting service 44 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 61
if purchased in the United States or Puerto Rico, or Canada, and located in the country of purchase. If you have any questions, contact IBM or your reseller. Machine: IBM ThinkPad T20 and the Battery Pack Warranty period*: Model 2647 and 2648: Three Years except in some countries Model 2649: One - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 62
the problem determination, problem analysis, and service request procedures that IBM or your reseller provide, b) secure all programs, data, and funds contained in a Machine, c) inform IBM or your reseller of changes in a Machine's location, and d) for a Machine with exchange service, remove all - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 63
computer is on when the century changes, you should turn it off and then back on again once, or restart the operating system, to ensure that the internal clock resets itself for the new century. This IBM PC product cannot prevent errors that might occur if software you use or exchange data with is - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 64
the IBM Corporation in the United States or other countries or both: IBM HelpCenter PS/2 ThinkPad TrackPoint Microsoft, Windows, and Windows NT are .com/tradmarx.htm) Other company, product, or service names may be the trademarks or service marks of others. 48 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 65
notices Federal Communications Commission (FCC) Statement ThinkPad T20, model number 2647 installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user IBM authorized dealer or service operation - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 66
Notices Industry Canada Class B IBM option cards. A declaration of Conformity with the requirements of the Directive has been signed by IBM United Kingdom Limited, PO BOX 30 Spango Valley Greenock Scotland PA160AH. This product satisfies the Class B limits of EN 55022. 50 IBM ThinkPad T20 User - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 67
or procedures that could affect the proper operation of your equipment. If they do, you will be given advance notice to give you an opportunity to maintain uninterrupted service. 5. If you experience trouble with this product, contact your authorized reseller, or call IBM. In the United States, call - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 68
documents. The Department does not guarantee the equipment will operate to the user's satisfaction. Before installing this equipment, users should ensure that it is permissible to be connected the Ringer Equivalence Numbers of all the devices does not exceed 5. 52 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 69
ne doit pas tenter de faire ces raccordements lui-même; il doit avoir recours à un service d'inspection des installations électriques ou à un électricien, selon le cas. AVIS : L'indice d'équivalence de la la sonnerie de tous les dispositifs n'excède pas 5. Appendix A. Product warranty and notices 53 - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 70
dialling. There is no guarantee that Telecom lines will always continue to support pulse dialling. Use of pulse dialling, when this equipment is connected to the same line as other equipment, may give rise to bell tinkle or noise and may also cause a false answer 54 IBM ThinkPad T20 User's Reference - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 71
Switzerland, Republic of Ireland, United Kingdom. Operation in pulse dialing mode is supported only for PBXs. To operate with the networks listed above, the modem should be set as explained in the chapter headed "Use the built-in modem" in the online user's guide. For Spain: A change in the polarity - Lenovo ThinkPad T21 | English - 46L4325 - ThinkPad T20, T21User's Reference guid - Page 72
56 IBM ThinkPad T20 User's Reference