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8

C

HAPTER

2: W

INDOWS

95

Installing the Network
Interface

■

Setup Procedure

■

Installing Network Software Components

■

Confirming Installation

Setup Procedure

Before installing the network interface, insert the LAN+Modem card and connect
to the network as described in “Installing and Connecting the Card” on page 1.
Obtain the following information from your MIS department:

■

For Windows 95 networking, your computer name and workgroup name.

■

For your network account, your user name and password.

To set up the network interface:

1

Turn on the computer and start Windows 95. Windows 95 detects the card during
startup.

2

Follow the instructions in the

Update Device Driver Wizard

dialog box. Insert the

LAN+Modem card

Windows 95/98 Installation Disk

in the floppy drive and click

Next

.

3

After the system finds the installation files on the disk, it displays the card name,

3Com 10-100 LAN + 56K Modem CardBus PC Card (Ethernet interface)

. and

prompts for the location of the driver files.

4

Click

Finish

to copy the files needed for the Ethernet interface.

■

If prompted for the “3Com 10-100 LAN + 56k Modem PC Card Windows
95/98 Installation Disk,” select the floppy drive as the location of the files.

■

If prompted for Windows 95 files, supply your CD or type the path to the
directory where your Windows 95 files reside. Normally, this path is
C:\WINDOWS\OPTIONS\CABS.

Click

OK

to finish copying the required files.

5

If Windows 95 opens the Network Setup box, supply your computer name and
workgroup name, then click

Close

.

6

When Windows 95 prompts whether to reboot the computer, remove the

Windows 95/98 Installation Disk

from the floppy drive and click

YES

. Windows 95

will detect and install the modem interface when it reboots.

If you choose not to reboot after installing the network interface, you must install
the modem interface manually when Windows 95 discovers the modem. See
“Installing the Modem Interface” on page 10.

Installing Network

Software Components

You will need to install four types of network components for Windows 95
networking: Client, Adapter, Protocol, and Service. These components are
installed through the Network application in the Control Panel. Open the Network
application in the Control Panel to see which network components are currently
installed.

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Содержание PC Card

Страница 1: ... 3Com 10 100 LAN 56K Modem CardBus PC Card User Guide PDF Version Prepared August 1998 ...

Страница 2: ...copy will be provided to you UNITED STATES GOVERNMENT LEGEND If you are a United States government agency then this documentation and the software described herein are provided to you subject to the following All technical data and computer software are commercial in nature and developed solely at private expense Software is delivered as Commercial Computer Software as defined in DFARS 252 227 701...

Страница 3: ...nfirming Installation 10 Installing the Modem Interface 10 Setup Procedure 10 Confirming the Installation 11 Testing the Modem 11 Uninstalling the Card 11 Removing the Card 11 Removing Card Software 11 Troubleshooting 12 Updating Windows 95 Drivers 13 Updating LAN Drivers 13 Updating Modem Drivers 13 3 WINDOWS 98 Installing the Network Interface 15 Setup Procedure 15 Installing Network Software Co...

Страница 4: ...munications Applications 25 Making a Call with HyperTerminal 26 Making Calls from a Hotel or Business PBX 26 Additional Modem Features 27 Redialing 27 Dialing Stored Numbers 27 Call Progress Detection 27 Fax Support 27 AT Commands 28 Entering AT Commands 28 S Registers 32 Common Registers 33 Analog Modem Registers 46 Modem Troubleshooting 52 6 DIAGNOSTICS LAN Diagnostics 55 Modem Diagnostics 55 DE...

Страница 5: ... card has a LAN port and modem port The connectors and card ports are color coded Take care to connect each cable to the correct card port Figure 1 LAN and Modem Ports NOTE When attaching connectors to the LAN Modem card insert them with the icon side up The connector should seat easily without forcing ...

Страница 6: ... below The power to the computer can be on or off Without forcing the card push until it seats firmly Figure 2 Inserting the LAN Modem Card CAUTION Forcing the card into the slot may bend the pins If you do not know how to insert cards in your computer refer to the documentation supplied with your computer on using PC Card PCMCIA slots ...

Страница 7: ...for a network connection at your site 1 Attach the network connector at the end of the network cable to the LAN port See Identifying the LAN Modem Card Ports on page 1 on the LAN Modem card 2 Connect one end of the RJ 45 extension cable to the network connector and the other end to the network segment Figure 3 Connecting the Twisted Pair Adapter ...

Страница 8: ...e network drivers must be installed For information on installing drivers see Windows 95 on page 7 Windows 98 on page 15 Windows NT on page 21 Table 1 LAN Connector LEDs LED Description Steady Off 10 LNK Link integrity Good 10BASE T connection between PC Card and hub No connection between card and hub Off when 100 LNK LED is on 100 LNK Link integrity Good 100BASE TX connection between PC Card and ...

Страница 9: ...m port See Identifying the LAN Modem Card Ports on page 1 The line port on the modem cable connector is labeled with an RJ 11 modular telephone plug icon Attach the connector with the icon facing up Next attach the RJ 11 adapter at the other end of the modem cable to the telephone wall plug Figure 5 Connecting the Modem Adapter to the Telephone Line ...

Страница 10: ...guide 1 Insert User Guide and Diagnostics Installation Disk 1 in the floppy drive and click Start 2 Click Run and type a setup Enter to begin installation Choose which options to install and follow the instructions as they appear A PDF version of the User Guide is also provided The file is called For Print LAN Modem Card User Guide PDF and is suitable for viewing or printing with the Acrobat Reade...

Страница 11: ...rompts for the Windows CD put the Windows 95 CD in your CD ROM drive Often this will be drive D If so the path in the dialog box should point to D WIN95 Some computers are delivered with Windows 95 installed but no CD is supplied If this is the case with your computer you must supply the path where the Windows 95 software resides Check your owner s manual for details Often this will be a subdirect...

Страница 12: ...et interface If prompted for the 3Com 10 100 LAN 56k Modem PC Card Windows 95 98 Installation Disk select the floppy drive as the location of the files If prompted for Windows 95 files supply your CD or type the path to the directory where your Windows 95 files reside Normally this path is C WINDOWS OPTIONS CABS Click OK to finish copying the required files 5 If Windows 95 opens the Network Setup ...

Страница 13: ...ng Network Software Components Type of Network Component Manufacturer Option to Select Microsoft Networking and Netware Adapter 3Com 3Com 10 100 LAN 56K Modem CardBus PC Card Microsoft Networking for Windows 95 Windows NT and Windows 98 Client Microsoft Microsoft Client for Microsoft Networks Protocol Microsoft NetBEUI Service Microsoft File and printer sharing for Microsoft Networks NetWare for B...

Страница 14: ...ng the Installation Testing the Modem Setup Procedure If you choose not to reboot after installing the network interface you must install the modem interface manually when Windows 95 discovers the modem 1 Windows 95 displays a New Hardware Found dialog box and identifies the modem interface 2 Insert the LAN Modem card Windows 95 98 Installation Disk in the floppy drive 3 Select the floppy drive as...

Страница 15: ...mmands This will confirm that the modem is functioning properly Uninstalling the Card If the card installation is unsuccessful for any reason your best course may be to remove the card and its software and repeat the installation procedures with a fresh installation of the operating system Sometimes earlier installations or interrupted installation attempts leave problems that affect card operatio...

Страница 16: ...onflict is Verify that there are adequate system resources Try to free system resources e g disable the infrared port then remove and reinstall the card After you remove the card from the system and then inserted back Windows runs installation process again This is normal behavior for Windows with PCI and CardBus cards installed Windows 95 can install one instance of the card for every slot presen...

Страница 17: ...click Next 7 Select Have Disk Specify the location of the new driver files and click OK 8 After Windows copies the files click Restart for the changes to take effect Updating Modem Drivers 1 From the Control Panel open the System application 2 Select the Device Manager tab 3 Double click Modems 4 Double click 3Com 10 100 LAN 56K Modem CardBus PC Card Ethernet interface 5 Open the Driver tab and cl...

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Страница 19: ...t driver for your device and click Next 3 Select Floppy Drives insert the LAN Modem card Windows 95 98 Installation Disk and click Next 4 After finding the installation files on the diskette the hardware wizard displays the card name 3Com 10 100 LAN 56K Modem PC Card Ethernet interface Click Next to copy the required files 5 Insert the Windows 98 CD if prompted Optionally you may specify a locatio...

Страница 20: ...rk types Table 3 Adding Network Software Components Type of Network Component Manufacturer Option to Select Microsoft Networking and Netware Adapter 3Com 3Com 10 100 LAN 56K Modem CardBus PC Card Microsoft Networking for Windows 95 Windows NT and Windows 98 Client Microsoft Microsoft Client for Microsoft Networks Protocol Microsoft NetBEUI Service Microsoft File and printer sharing for Microsoft N...

Страница 21: ...e Manager tab A list of devices appears arranged by type 5 Double click Network Adapters The LAN Modem card name appears confirming successful installation 6 Double click the entry for the LAN Modem card to display a description of the card and its current status The device status should indicate This device is working properly 7 Click the Cancel button to return to System Properties 8 Click OK to...

Страница 22: ...ming Installation 1 Double click the My Computer icon 2 Double click the Control Panel icon 3 Double click the System icon The System Properties box details your system setup 4 Click the Device Manager tab A list of devices appears arranged by type 5 Double click Modems It should display the entry for the 3Com 10 100 56K CardBus PC Card 6 Double click the entry for the LAN Modem card It should con...

Страница 23: ...functions not working Windows 98 not detecting the card The system issuing a warning tone at startup If you are having any of these problems remove the LAN Modem card and software using the procedures below then reinstall the card Removing the Card Check your computer manual for information on removing cards Store the card in its original or similar packaging Removing Card Software Open Control Pa...

Страница 24: ... system resources Try to free system resources e g disable the infrared port then remove and reinstall the card After you remove the card from the system and then inserted back Windows runs installation process again This is normal behavior for Windows with PCI and CardBus cards installed Windows 98 can install one instance of the card for every slot presented in the system If you proceed with thi...

Страница 25: ...ck Yes This opens the Network Setup Wizard 3 Check Wired to the network and click Next 4 When the system prompts to have setup start searching for a network adapter click Select from List 5 Click Have Disk Insert the LAN Modem card Windows 95 98 Installation Disk into the floppy drive Specify a NT40 and click OK 6 When the Select OEM Option window opens select 3Com 10 100 LAN 56K Modem PC Card Eth...

Страница 26: ...ign a COM port to the modem The following procedure assumes you will create a new COM port for this purpose If you plan to use an existing COM port make sure it is not being used by another device such as a built in infrared port 1 Open the Control Panel and select Ports 2 Click Add to create a new COM port 3 Set the COM port number to 5 or higher Do not give the new port the same number as an exi...

Страница 27: ...ll the card You can download the latest Service Pack from Microsoft Service Pack 3 or newer Application cannot find the modem An older application may not be aware of COM ports higher than COM4 If your modem is installed on COM5 or higher reinstall the modem using one of the legacy COM ports COM2 COM3 or COM4 Modem will not fax Most Windows fax software will not work with Windows NT Contact Micros...

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Страница 29: ... modem produces the highest transfer speed If the modems do not connect during the handshake try disabling error correction use the AT command AT N0 You can also try disabling data compression AT C0 Software Settings Communications software setup requires information about the modem to make a call or send a fax using the modem Enter the following settings with the modem software you are using Sele...

Страница 30: ...mber of the Dell BBS 6 In the Connect Using menu be sure that you have selected the 3Com 10 100 56K PC Card If it does not appear your modem is not installed correctly 7 Click OK 8 When the Connect dialog box appears choose the location and the dialing properties for example dial a 9 to access an outside line dial a 1 before long distance wait for a dial tone and so forth you require to make the c...

Страница 31: ...s lets you know when The telephone number you have dialed is busy The line has been picked up but a modem is not answering the call There is no dial tone on the telephone line A call is coming in These result codes and the commands that enable or disable these result codes are controlled by the ATXn command Fax Support To send or receive faxes using the modem you must have a facsimile software pac...

Страница 32: ...All AT command lines must begin with the prefix AT Spaces between command characters and option characters are ignored Command line parameters cannot exceed 255 characters Use a carriage return Enter to enter a command line Commands take effect as soon as they are received Type commands in either upper or lower case not a combination If you leave the number off a command zero is assumed For exampl...

Страница 33: ...lishment mode ATO or ATD must be entered Any characters that follow this parameter are treated as AT commands Do not send calling tone Causes a 0 5 second delay before the modem dials the digits DTMF following this modifier L Causes the last telephone number that was dialed by the modem to be re dialed S Causes the modem to dial the number in stored position n Format is S n or Sn If S41 is set to ...

Страница 34: ...chipset revision I7 The modem sends platform specific information N0 Sets the required connection speed to that set under S37 N1 If S register S37 is not equal to 255 it allows handshaking at the highest speed supported by both modems If S register S37 equals 255 it allows handshaking at the highest speed supported by both modems and DTE N2 If S register S37 is not equal to 255 it allows handshaki...

Страница 35: ...on speed result codes X2 Causes the modem to detect dial tone X3 Causes the modem to detect busy tone X4 Causes the modem to detect busy and dial tones X5 Causes the modem to report ringing to detect busy but dial tone is ignored X6 Causes the modem to perform adaptive dialing automatically determine if dialing can be performed using DTMF signaling to report ringing to detect busy and dial tones T...

Страница 36: ...nications software and enter Terminal mode 3 Type ATS0 3 and press Enter The modem will now answer a call after three rings All values are in decimal format Default values indicated in bold type are those written after execution of the F0 command If the register TYPE is Nonstorable this default value will also be written whenever the modem is reset For storable register however the value after res...

Страница 37: ...Wait Time For Carrier Second Dial Tone Value 1 255 Default 30 Storable S8 Duration for Pause Dial Modifier Value 0 255 Default 2 Storable S9 Carrier Detect Response Time Value 1 255 seconds Default 1 Storable S10 Delay Between Lost Carrier And Hang Up S10 255 implies infinite delay Value 1 255 seconds Default 14 Storable S11 DTMF Tone Duration and Silence Time Between Tones Value 50 255 ms Default...

Страница 38: ...cal digital loopback active Bit 3 Status of Local digital loopback initiated by remote mode 0 No Local digital loopback 1 Local digital loopback initiated by remote modem active Bit 4 Remote digital loopback T6 CMD 0 No Remote digital loopback active 1 Remote digital loopback initiated and granted by remote Bit 5 Remote digital loopback with self test T7 CMD 0 No Remote digital loopback active 1 R...

Страница 39: ...0011110 00011111 00100000 00100001 00100010 00100011 00100100 00100101 00100110 00100111 00101000 00101001 00101010 00101011 00101100 DTE Speed 2400 300 1200 2400 4800 7200 9600 12000 14400 16800 19200 21600 24000 26400 28800 31200 32000 33600 34000 36000 38000 38400 40000 42000 44000 46000 48000 50000 52000 54000 56000 57600 64000 72000 but no connect mess available 76800 but no connect mess avai...

Страница 40: ...eaker volume control L CMD 0 Low 1 Low 2 Medium 3 High Bit 3 2 Speaker control M CMD 0 Always off 1 On until carrier detected 2 Always on when off hook 3 Off during dialing and after carrier detected Bit 6 5 4 Extended response codes X CMD 0 Ignore GSTN status and do not report connection speed X0 1 Detect busy and ringing tones and report connection speed X5 2 As for X5 and also detect dial tone ...

Страница 41: ...cept RDLB T4 CMD Bit 3 2 1 DTE port communications speed bits s 0 300 4 4800 1 57600 5 9600 2 1200 6 19200 3 2400 7 38400 Note bits 3 2 and 1 of S23 are only valid if bits 3 2 1 of S19 0 Bit 5 4 Parity 0 Even 2 Odd 1 Space none 3 Mark Bit 7 6 Guard Tone G CMD 0 None 2 1800 Hz 1 550 Hz 3 Not used ...

Страница 42: ...imum speed up to S37 if S37 255 Bit 4 DCE speed to be negotiated during handshake N CMD Optimum speed up to DTE if S37 255 0 S37 speed 1 Optimum speed if S37 255 Bit 6 5 Extended connection result code W V CMD 0 No extended result code 1 Hayes extended result code 2 Microcom extended result code 3 Not used Bit 7 DTE speed after handshake completed B J CMD 0 DTE set to DCE speed 1 DTE speed not cha...

Страница 43: ...t 2 Leased line L CMD 0 GSTN Bit 5 4 Synchronous transmit clock source X CMD 0 Internal 1 External 2 Derive from receiver slave Bit 6 Bell CCITT B CMD 0 CCITT 1 Bell Bit 7 Reserved S28 Bit mapped Storable Bit 1 0 Error Correction Maximum Block Size A CMD 0 64 bytes 2 192 bytes 1 128 bytes 3 256 bytes Bit 6 5 4 3 2 V 42 detection period T400 in 50 milliseconds increments G CMD 0 Infinite 1 to 155 n...

Страница 44: ...ways use CRC 16 1 Attempt use if CRC 32 Bit 7 V 42 selective reject S CMD 0 Disabled 1 Enabled S30 Bit Mapped Default 15 packet Storable Bits 4 0 V 42 windows size k K command These 5 bits are interpreted as an integer that specifies the maximum number of unacknowledged packets that V 42 and MNP will allow at anytime Although the bits may be set to any value between 0 and 31 a setting of zero is u...

Страница 45: ...ped Storable Bits 1 0 Encryption mode select S CMD 00 No encryption S0 10 Reserved for later use 01 Force V 42bis encryption S1 11 Reserved for later use Bits 3 2 MNP Extended Services K CMD 00 Disabled K0 10 Enabled without MNP indication during the answer detect phase K2 01 Enabled K1 Bit 4 Power level adjustment setting M command 0 Disable M0 1 Enabled M Bits 6 5 Force an initial connection spe...

Страница 46: ...tion at 12000 bps Storable For N0 command 0 Last AT command speed 1 M 300 Bell 103 2 M 300 Bell 103 3 M 300 Bell 103 4 400 V 110 5 1200 V 22 or B212 or V 110 6 2400 V 22bis or V 110 7 M V 32 4800 8 reserved 9 M V 32 9600 with Trellis Coded Modulation TCM 10 M V 32 9600 without TCM 11 M 300 V 21 12 M 1200 V 23 13 reserved 14 I 3600 15 V 32bis 4800 or V 110 4800 16 V 32bis 7200 or V 110 7200 17 V 32...

Страница 47: ...s s 00 as set per S23 bits 1 2 and 3 01 115 200 10 230 400 11 460 800 Bit 5 4 Break handling I K CMD 0 Non destructive non expedited 1 Non destructive expedited 2 Destructive expedited Bit 6 EIA loopback test control T9 T10 CMD 0 Ignore EIA loopback test T10 1 Process EIA loopback test T9 Bit 7 Auto retrain E CMD 0 Disable 1 Enable S40 Inactivity Timer 0 Inactivity timer disabled Value 0 255 minut...

Страница 48: ...V 25ter only 00 Discard all buffered data immediately 10 Attempt until all data is delivered or timer expires timer is set by S38 01 Attempt until all data is delivered Bits 7 6 V42bis compression option V 25ter only 00 No compression 10 Decompression only 01 Compression only 11 Both direction S43 Break length transmitted to DTE when not specified in UI frame in 10 ms V 25ter only Default 30 Nonst...

Страница 49: ... Modem to DTE unidirectional flow control 12 Modem to DTE bidirectional transparent flow control 16 Modem to remote modem bidirectional flow control 20 DTE to modem to remote modem bidirectional flow control Bit 5 Reserved Bit 6 Dumb mode 0 Smart mode 1 Dumb mode Bit 7 Compromise equalizer E CMD 0 Compromise equalizer enabled 1 Compromise equalizer disabled ...

Страница 50: ...vative 2 Aggressive 1 Medium Bit 5 V 34 precoding 0 Disable 1 Enable Bit 4 V 34 shaping 0 Disable 1 Enable Bit 3 V 34 pre emphasis filter 0 Disable 1 Enable Bit 2 V 34 non linear encoding warping 0 Disable 1 Enable Bit 1 V 34 transmit power control 0 Disable 1 Enable Bit 0 V 34 asymmetric bit rates 0 Disable 1 Enable ...

Страница 51: ...ble 1 Enable Bit 3 V 34 2743 high carrier frequency 0 Disable 1 Enable Bit 2 V 34 2743 low carrier frequency 0 Disable 1 Enable Bit 1 V 34 2400 high carrier frequency 0 Disable 1 Enable Bit 0 V 34 2400 low carrier frequency 0 Disable 1 Enable S54 Bit mapped Storable Bit 7 6 5 4 3 Not used Bit 2 V 34 3429 Carrier Frequency 0 Disable 1 Enable Bit 1 V 34 3200 high carrier frequency 0 Disable 1 Enable...

Страница 52: ...e Bit 0 Enable V 8 for non V 34 answer 0 Disable 1 Enable S60 Modulation Bit Map V 25ter only Default to all enabled Nonstorable Bit 0 Enable disable Bell 103 and Bell 212 Bit 1 Enable disable V 21 Bit 2 Enable disable V 22 and V 22bis Bit 3 Enable disable V 23 Bit 4 Enable disable V 32 Bit 5 Enable disable V 32bis and V 32terbo Bit 6 Enable disable V 34 and V 34 Bit 7 Not defined S62 Data Rates B...

Страница 53: ...it 1 1200 Bit 2 2400 Bit 3 4800 Bit 4 7200 Bit 5 9600 Bit 6 12000 Bit 7 14400 S66 Data Rates Bit Map V 25ter only Default to 0 Nonstorable Bit 0 16800 Bit 1 19200 Bit 2 21600 Bit 3 24000 Bit 4 26400 Bit 5 28800 Bit 6 31200 Bit 7 33600 S70 V 25ter Reporting Messages Default to 0 Nonstorable Bit 0 Enable modulation reporting Bit 1 Enable error correction reporting Bit 2 Enable data compression repor...

Страница 54: ...ort All Nonstorable Bits 1 0 In band Control Selection 00 In band control disabled 01 In band control allowed with 7 bits codes 10 in Band Control Allowed with 7 and 8 bits codes 11 not used Bit 2 Report circuit 105 Bit 3 Report circuit 106 Bit 4 Report circuit 107 Bit 5 Report circuit 108 Bit 6 Report circuit 109 Bit 7 Report circuit 110 S73 V 80 Status of the V24 Circuit Reporting Section 2 Defa...

Страница 55: ...Bits 6 5 CRC type 00 CRC generation and checking disabled 01 Use 16 bits CRC 10 Use 32 bits CRC 11 not used Bit 7 NRZI encoding S75 V 80 Synchronization Sequence first byte Synchronization sequence used while in synchronous access mode When using 16 bits SYN this register represent the first 8 bits Nonstorable Default is 256 S76 V 80 Synchronization Sequence second byte Last 8 bits of a 16 bits SY...

Страница 56: ...edisplayed check Mono In Balance Ensure that the mute box is unchecked Error Message Make sure you selected the correct COM port in your software If you are typing from the command line in terminal mode retype the command Make sure you are issuing the correct command Modem does not dial correctly Make sure you have entered the telephone number correctly if you are using the dialing directory Make ...

Страница 57: ... length and stop bits are set up according to specifications Try removing all of the error correction and data compression No Dial Tone Message Check all the cable connections and make sure they are secure The connection to the phone line could be incomplete or the phone cable could be bad Make sure the telephone line you are using is not in use by someone else Check to make sure you are using a s...

Страница 58: ......

Страница 59: ...cluding a dial up test for Windows 95 and Windows 98 maintains a detailed log file and provides utilities for editing system files 1 Click the Windows Start menu 2 Select Programs 3 Select 3Com PC Card Utilities 4 Select Modem Diagnostics Modem diagnostics includes a separate Help utility with information on how to run modem diagnostics tests CAUTION If you remove the card or shut down your comput...

Страница 60: ......

Страница 61: ...s manual for your communications software for instructions on uploading and downloading files Return Merchandise Authorizations If a Dell Support Representative instructs you to return the modem to Dell you will receive a Return Merchandise Authorization RMA number The RMA number tells the Receiving Department what type of equipment is inside the package and what action is necessary If you need to...

Страница 62: ......

Страница 63: ...roducts to you is covered under this warranty Otherwise the warranty does not cover damage due to external causes including accident abuse misuse problems with electrical power servicing not authorized by Dell usage not in accordance with product instructions and failure to perform required preventive maintenance Dell will repair or replace products returned to Dell s facility To request warranty ...

Страница 64: ...ommunications Commission FCC rules On the product is a label that contains the FCC registration number and Ringer Equivalence Number REN for this device If requested this information must be provided to the telephone company An FCC compliant telephone cord with a modular plug is provided with this equipment This equipment is designed to be connected to the telephone network or premises wiring usin...

Страница 65: ...d be made by an authorized Canadian maintenance facility designated by the supplier Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request the user to disconnect the equipment Users should ensure for their own protection that the electrical ground connections of the power utility telephone lines and internal ...

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