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`
`Chapter 6
`Diagnostics and Service
`
`This chapter describes the diagnostic tests performed by the
`modem when it is powered up and provides user assurance test
`procedures along with troubleshooting guidelines if you
`encounter a problem while setting up or using the modem.
`
`Diagnostic Tests
`
`When power is turned on, the modem automatically runs a series
`of self-diagnostic tests. The results of these tests can be obtained
`by using the --I1 command. This command returns a decimal
`number which represents the sum of the failure codes triggered
`during testing. If no errors are detected during the diagnostic
`tests, 000 (zero) is returned.
`
`You can run the diagnostic tests at any time by using the --&T
`command. However, you should not run the diagnostic tests
`during a current communications session as this will disconnect
`the line and reset the modem. The ~&T command displays the
`results of the tests as a short message on the screen. If no errors
`are detected, the -&T command returns a “Diagnostics
`Complete” message.
`
`The diagnostic tests performed by the modem upon power up or
`when the ~&T command is issued are listed below:
`
`ROM Test
`
`RAM Addressing Test
`RAM Read/Write Test
`EEPROM Test
`Loopback Test
`32010 Signal Processor Test
`
`Successful completion of the first three tests means that the
`modem’s firmware is intact and that the memory is functioning
`correctly.
`
`Rev. D
`
`Page 6.1
`
`

`
`Diagnostics and Service
`
`During the EEPROM test, a checksum is read which tests the
`integrity of the non—volatile memory. If the checksum is correct,
`Profile A or B register settings stored in the EEPROM are loaded
`into memory. If the checksum is incorrect, the factory default
`settings are loaded. The configuration loaded is dependent on
`the current setting of the S255 register.
`
`The final two tests check the loopback capability of the Digital
`Analog Interface chip and verifies that the 32010 Signal
`Processor chip is operating correctly.
`
`User Assurance Tests
`
`The following tests are intended to check those components not
`tested at power- up. You should be familiar with the contents of
`this manual and understand how to operate the modem. It is
`assumed that you can communicate with the modem through the
`RS -232C serial interface port using a terminal or personal
`computer. If you are not able to communicate with the modem
`through the serial interface, read the Troubleshooting section at
`the end of this chapter.
`
`Non-volatile Memory Test
`
`To verify that the modem's non-volatile memory is working
`correctly:
`
`1.
`_
`
`Enter one or two telephone numbers in the Number
`_ Directory.
`
`2.
`
`Turn the modem off then back on, and verify that the new
`numbers are still present.
`
`Telephone Dialer Test
`
`To check the integrity of the analog/digital circuitry and
`telephone line interface:
`
`1 .
`
`Enter the following tone dialing command:
`
`AT DT 12345
`
`2.
`
`Listen to the tones from the speaker to verify that the
`modem is tone dialing.
`
`Page 6-2
`
`Rev. D
`
`Ill
`
`7'.
`
`

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`W‘:
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`
`Diagnostics and Service
`
`3.
`4.
`
`Press the any key to hang up the line.
`Enter the following pulse dialing command:
`
`AT DP 12345
`Listen for the relay clicking sounds to verify that the
`5.
`_, modem is pulse dialing.
`
`Telephone Llne Relay Test
`
`7?:
`
`To check the operation of the line relay control signals:
`
`1.
`
`2.
`
`3.
`
`Plug a telephone into the PHONE connector on the
`modem’s rear panel, and verify that the modem is
`connected to the telephone line via the LINE connector.
`Lift the receiver and listen for a dial tone.
`
`Enter the following command to take the telephone line
`off-hook:
`AT H1
`
`The dial tone from the receiver should go away when the
`modem goes off-hook (OH indicator lit).
`
`4.
`
`Enter the next command to hang up the telephone line:
`
`AT H0
`
`The dial tone from the telephone receiver should return.
`
`Ring Detect Test
`The easiest way to check the modem’s ring detection circuit is to E
`disable the auto-answer feature by setting the S0 register to 0,
`and call the number to which the modem is connected. When the
`modem detects a ring signal, the word RING is displayed on the
`screen. The word should appear every four to six seconds to
`indicate the end of each ring signal.
`
`Remember to set the S0 register back to 1 if you plan on using the
`auto~answer feature.
`-
`
`-5
`
`__
`
`_-li
`
`Lil
`
`.hiL.IJLlJLiJ
`
`Rev. D
`
`page 6.3
`
`

`
`Diagnostics and Service
`
`Troubleshooting
`
`If you encounter problems while setting up and using your
`modem, you can simplify the troubleshooting process by
`progressing in stages. This approach makes it easier to isolate
`and resolve any problems which you might encounter as you
`progress through the various stages.
`
`This section covers the following three stages of establishing a
`communications link:
`
`‘.1
`
`vi‘.
`
`R,,
`
`.R
`
`N».
`
`0
`
`I
`
`0
`
`Pro-call lnltlallzatlon - focuses on ensuring that the
`modem and your equipment are properly configured for
`communications over the DTE—DCE interface.
`To confirm that the modem can in fact communicate with 2
`your equipment, refer to Table 6— l .
`Call Establlshment - deals with problems which may
`occur while attempting to place or answer a call up to the
`point at which data can be exchanged across the
`communications link.
`
`-
`2
`
`2
`
`If you have problems placing or answering a call, refer to
`Table 6-2 or 6-3, respectively.
`
`call In Progress - addresses problems which may occur
`while actually transmitting information between two
`locations.
`
`Some of the problems which can occur while a call is
`in progress are: lost or garbled data, the modems
`unexpectedly stop communicating, or the connection is
`prematurely dropped. If you experience problems in any E
`of these areas refer to Table 6-4 for recommended
`solutions.
`E
`
`E
`
`Page 6-4
`
`Rev. D
`
`

`
`Diagnostics and Service
`
`
`
`
`
`
`
`Table B-1. Modem Preconiiguration
`Is the MR (Modem Heady) indicator on the trout panel lit?
`
`It the
`The MR light indicates that the modem is operational.
`indicator is-oil. try issuing an AT ~i1 command to obtain the results
`of the diagnostic tests. it you get no response or the test result
`code returned is not 000, try running the sell-diagnostics test again
`by turning the modem’s power on and back on.
`it the MR indicator
`still does not light, contact your technical support representative for
`further assistance.
`
`
`
`
`
`
`
`
`
`
`
`7"‘!
`.,_ ‘
`
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`--
`
`1
`
`’
`
`‘
`
`3
`
`__
`3
`
`..i
`
`issue an AT -N? command to display the modem’s current
`register settings.
`
`Are double characters appearing on the screen?
`Both the DTE and the modem are echoing characters to the
`screen. Disable local echo on your DTE.
`It this is not possible
`then disable echo lrorn the modem by issuing an AT «E0
`command to the modem.
`
`Are you getting garbled data or no response from the
`modern?
`
`Verify that the modem is connected to a functioning HS-232C port
`on your DTE, and that the RS-232 cable is coniigured correctly.
`
`Make sure that the modem and DTE are both using the same
`interface speed and data format.
`It your modem has been used beiore. you may need to re-initialize
`it tor either Enhanced or Conventional Command Mode as
`described in Chapter 3, Using the Modem.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`coniigure the modem to meet the specltic requirements of
`your system and save the configuration parameters In non-
`volatile memory.
`
`
`
`
`
`Reier to Chapter 4, Conventional Command Mode, or Chapter 5,
`Enhanced Command Mode, tor configuration guidelines.
`
`*
`
`Rev. D
`
`page 3-5
`
`

`
`“to
`
`N!
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`W4.WE“:
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`
`Diagnostics and Service
`
`Table 6-2. Placing a Call
`
` Is the telephone line connected to the T0 LINE connector on
`
`the modem's backpanel?
`
`
`
`
`
`
`
`
`A common mistake is to connect the telephone line to the PHONE
`connector which is used for connecting a telephone to the modem
`ior voice communications. Connect the telephone line to the LINE
`connector on the rnodem’s backpanei. Optionally, connect a
`telephone set to the PHONE connector.
`
`
`
`Is the modem ready to accept commands or data trom the
`DTE? The MR (Modem Ready). DTH (Data Terminal Ready)
`and CTS (Clear to Send) Indicators should be lit.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`terminal or computer.
`
` Send a dialing command sequence to the modern train your
`
`
`
`
`
`
`
`
`
`Be sure to include any required access codes and wait tor dial tone
`characters (W) in the dialing sequence. it your call requires
`operator assistance you can place a call manually using your
`teiephone set. then press the T/D switch to cause the modem to go
`oit-hook and listen tor the called modem’s answer tones.
`
`
`
`
`
`The modern must be operational and able to communicate with the
`DTE before placing a call. See Table 6-1 for information on
`verifying that the modem is able to communicate with your
`equipment.
`
` Did the modem go ott-hook and begin the dialing sequence?
`
`
`You should hear a brief dial tone tollowed by dialing sounds
`as the modem places the call. The OH (Oil-Hook) indicator
`should be lit.
`
`
`
`Ii the OH indicator did not light. the modem probably did not
`recognize the dial command. Try entering the command again.
`Be sure to precede the command with an AT prelix (unless register
`S63 is set to 0) and iollow the command with a carriage return.
`Verity that the modem is properly conligu red to communicate with
`your equipment.
`
`it you did not hear a dial tone betore the modem started dialing,
`connect a telephone to the telephone line and listen for a dial tone.
`it you do not hear the dial tone. the telephone line is dead. Contact
`your telephone company service representative tor assistance.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Page 6-6
`
`99% D
`
`

`
`Diagnostics and Service
`
`Table 6-2. Placing a Call (continued)
`
`Did the telephone ring at the remote site? You should hear a
`ringing signal over the speaker.
`
`Depending on how quickly the remote site answers the call. you
`may not heara ringing signal.
`it you hearthe answering modem’s
`answer tones. you can assume that the remote site answered the
`call.
`
`Make certain that you entered the correct dialing sequence. it you
`are going through a PBX (Private Branch Exchange). you may
`need to enter "saw" to access an outside line and wait tor a second
`dial tone. The S6 register determines how long the modern will
`wait tor a dial tone when a "W" is entered in a dialing sequence.
`
`it your call is routed through key systems. security devices or
`similar equipment, additional access digits might be required. and
`it may take longer to set up the call. One or more commas can be
`used in the dialing sequence to cause the modem to pause when
`necessary. The length of the pause is determined by the S8
`register.
`
`You may need to extend the time that the modern will wait tor a
`carrier by increasing the value of the S7 register.
`
`It is possible that the touch tone speed is too fast for the phone
`switching equipment which occasionally happens with older phone
`equipment. Try lengthening the touch tone timing specified by the
`S11 register.
`
`Did the remote modern answerthe call? You should hear
`answer tones from the remote site over the speaker.
`
`It the phone continues to ring with no answer, verify that you are
`dialing the correct number. Ask the operator at the remote site to
`coniirm that their equipment will answer the phone.
`
`It the ringing signal steps but you do not hear the answer tones
`trom the answering modern, ask the operator at the remote site to
`check their equipment and connections.
`
`R9“ 9
`
`Page 6-7
`
`

`
`-
`
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`
`'
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`
`Diagnostics and Service
`
`Table 6-2. Placing a Call (continued)
`
`Did the modems at both ends synchronize? The FST(Fast) or
`SLW (Slow) Indicator should be lit depending on It a
`connection was made in PEP or Slow Mode.
`
`-
`
`Verity that the modems at both ends agree on the transmission
`mode used. The 850 register determines the transmission mode
`used by the modem.
`it this register is not set for Automatic Speed
`Determination (S50=0). it must match the transmission speed ot
`the remote modem.
`
`If the modern goes on-hook (the OH indicator turns oil) during
`synchronization, you may need to extend the time that it will wait
`for a carrier by increasing the value ot the S7 register.
`
`It you are calling a v.22 or V.22bis type modem, you should also
`check the setting oi the S90 and S91 registers. The S90 register is
`used to select either 212A (S90=0) or V.22 (S90=1) emulation
`when operating at 1200 bps. Some v.22 or V.22bis modems use
`guard tones during synchronization. Try changing the setting oi
`the s91 register to use either a 1300 Hz guard tone (S91 =1) or a
`550 Hz guard tone (S91 =2).
`
`it expected, did you receive a valid (ungarbied) sign-on
`message irom the remote site?
`
`Sign-on procedures vary from one system to another. You may
`need to press the space bar ortake some other action to get the
`sign-on message. Refer to the system's operating instructions for
`the appropriate procedure.
`It after taking the appropriate action you still do not receive a sign-
`on message. or the message is garbled. there may be some
`problem with the lnie rtace speed between the DTE and modem at
`either end, or a mismatch in the data torrnat (usually parity) used
`between the DTEs at each site. Fieler to Table 6-4 for iniormation
`on resolving either oi these two conditions.
`
`Page 6-3
`
`Rev. D
`
`

`
`;:
`
`.,-in
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`
`LIJ
`
`Diagnostics and Service
`
`Table 6-3. Answering a Call
`
`is the telephone line connected to the TO LINE connector on
`the modem's backpanel?
`A common" mistake is to connect the telephone line to the PHONE
`connect which is used lor connecting a telephone to the modem for
`voice communications. Connect the telephone line to the LINE
`connector on the modem's backpanel. Optionally, connect a
`telephone set to the PHONE connector.
`
`is the MR (Modem Ready) indicator on the modem's tront
`panel lit?
`The MR light indicates that the modem is operational. it the
`indicator is oil, the modern failed the power up diagnostic test.
`Contact your technical support representative for turther
`
`assistance.
`
`Did the modem answer an incoming call by going ott-hook
`when a ringing signal was received? The OH (Ott-I-look)
`indicator should be lit.
`
`It register 30 is set to 0, the modem will not automatically answer
`an incoming call. To enable auto-answer mode. set this register to
`the ring number on which the modem should answer a call.
`
`It S52 is non-zero. the modern will not answer an incoming call
`while DTFt (Data Terminal Ready) is oil. Your equipment should
`provide this signal when it is ready to transmit or receive data. or in
`response to a ringing signal on the RI (Ring Indicator) signal line of
`the RS-232 interface.
`It the DTFt indicator on the lront panel is not
`lit, verity that the RS-232 cable is conligured correctly.
`It your
`equipment asserts DTR in response to a ringing signal, verity that it
`is receiving a signal on the RI line, and turning on DTR at the
`appropriate time.
`
`Try placing the same can with a telephone set on each end of the
`connection.
`it the call cannot be placed with telephone sets, it will
`not work with modems.
`
`Rev. D
`
`Page 6-9
`
`

`
`Diagnostics and Service
`
`Table 6-3. Answering a Call (continued)
`
`Did the modem answer the call and then hang-up before a
`connection was established? This can occur very rapidly so
`that the OH (Oil-Hook) Indicator is barely noticeable. The
`caller may hear a pair ol clicks after the last ring.
`
`Make certain that your equipment is not sending a sign-on
`message belore DCD (Data Carrier Detected) is turned on. This
`could cause the modem to hang-up. Note that setting 864 to 1
`causes the modem to ignore any characters sent by the local DTE
`while dialing or answering a call.
`
`It the modem is configured to show status messages. your
`equipment may be echoing the status message back to the
`modem causing it to hang-up. To solve this problem. turn oil echo
`and place the modem in quiet mode by issuing the E0 and Q1
`commands.
`
`When S52 is non-zero, the modem will disconnect a call it DTH is
`dropped. Make certain that your equipment is not turning oii DTR
`during a call. Your equipment may be periodically switching DTR
`on and oil while searching tor an active device (looking for an
`active DSR or DCD signal item a modem). Try changing the S130
`and S131 register settings to enable these signals.
`If you cannot
`conligure your equipment to provide DTFi. set the S52 register to 0
`so that the modem will not hang up when DTR is not present.
`
`Did the modems at both ends synchronize? The FST(Fast) or
`SLW (Slow) Indicator should be lit depending on It a con-
`nection was made In PEP or Slow Mode.
`
`Verity that the modems at both ends agree on the transmission
`mode used. The 850 register determines the transmission mode
`used by the modem.
`it this register is not set tor Automatic Speed
`Determination (S50=O), it must match the transmission speed of
`the calling modem.
`
`Page 6-10
`
`Rev. D
`
`5??"
`
`N‘.yR.
`inW:W;
`
`‘Ti
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`
`Diagnostics and SGNICG
`
`Table 6-3. Answering a call (continued)
`
`when the modem answers a call in Automatic Speed
`Determination mode. it steps through several different answer
`tones to allow the calling modem to synchronize on the appropriate
`tone. lithe calling modem is not a PEP-compatible modern. it may
`be adversely altected by PEP answer tones. Try setting the S92
`register to 1 to move the PEP answer tones to the end oi the
`answering sequence.
`
`The calling modem may need to extend the time that it waits for a
`carrier beiore disconnecting to allow time for the modem to arrive
`at the correct answertone.
`
`Ii the calling modem is a V.22 or V.22bis type modem, you should
`also check the setting oi the S90 and S91 registers. The $90
`register is used to select either 212A (S90=0) or v.22 (S90=1)
`emulation when operating at 1200 bps. Some v.22 or V.22bis
`modems use guard tones during synchronization. Try changing
`the setting oi the S91 register to use either a 1800 Hz guard tone
`(S91=i) or a 550 Hz guard tone (S91 =2).
`
`it expected, did the calling modem receive a valid (ungarbled)
`sign-on message irom the remote site?
`
`Sign-on procedures vary irom one system to another. The caller
`may need to press the space bar or take some other action to get
`the sign-on message. Ask the operator at the calling site to
`conlirrn that they are iollowing the correct sign-on procedure.
`
`it after taking the appropriate action the caller still does not receive
`a sign-on message. orthe message is garbled. there may be some
`problem with the interface speed between the DTE and modem at
`either end. or a mismatch in the data format (usually parity) used
`between the DTEs at each site. Refer to Table 6-4 ior information
`on resolving either oi these two conditions.
`
`At this point, the modem should be capable of
`communicating with the calling modem.
`
`See Table 6-4 tor iniormation on solving problems which may
`occur during a communications session.
`
`H9V- D
`
`Page 6-11
`
`

`
`.Diagnostics and Service
`
`_J
`
`Table 6-4. call In Progress
`Is data (or the sign-on message) being garbled during
`
`transmission?
`
`It a connection has been made in non-packetized mode (SLW
`indicator is lit). the line quality of the connection may be inadequate
`tor error tree transmission. The modem only detects transmission
`errors when operating in packetized mode. Hang up and try
`placing the call again. The probability of getting the same
`connection is unlikely.
`
`There may be some problem with the interface speed between the
`DTE and modern at either end. or a mismatch in the data tormat
`(usually parity) used between the DTEs at each site.
`
`it the other modem is not a PEP-compatible modem, verity that
`your $66 register is set to 1. This prevents the modern trom
`changing the interlace speed when a connection is made.
`it S66 is
`set to 0 and a connection is made in non-packetized mode, the
`modem chanes the lntertace speed to match the speed at the
`connection.
`
`Ask the operator at the remote site to contirm that they do not have
`an interlace speed mismatch at their end.
`
`Check the setting at the S60 register. Except tor a law rare cases.
`this register should be set to 0 which permits end-to-end parity
`checking between DTEs as well as providing a transparent data
`path tor binary tile transmissions.
`
`Verity that the data tormat (data length. parity. and stop bits) used
`by your DTE matches the data format used by the DTE at the
`remote site. Reler to your equipment's manual tor instructions on
`setting the data tcrmat.
`
`is data being lost during transmission?
`
`Most problems with loss oi data during transmission result trom a
`mismatch in the new control method used between the modem
`and the DTE at either end. Data in the DTE or modem's butter is
`
`being overwritten.
`
`The DTE may not be responding to the tlow control signal soon
`enough to avoid a butler overllow condition.
`
`Page 6-12
`
`Rev. D
`
`P
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`_
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`II‘.II‘;N}
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`amt-immmm
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`
`Diagnostics and Service
`
`Table 6-4. Call in Progress (continued)
`The modem uses two registers to control the ilow of data between
`the DTE and the modem. The 858 register controls data ilow over
`the Received Data (no) line to the DTE. A similar register, see.
`controls data tiow overthe Transmitted Data (T0) line to the
`modern. The two most common ilow control methods supported
`by the modern are: XON/XOFF or HTS/CTS. Check your
`equipment's manual to determine which type of tlow control
`method it supports. and set the S58 and S68 registers to match
`that llow control method.
`
`Did either modern unexpectedly stop transmitting or receiving
`data?
`.
`
`The calling modem , answering modem or both modems may have
`been inadvertently placed in Command Mode by a break signal or
`escape sequence. Registers S54 and S55 determine how the
`modem will respond to a break signal or escape sequence. You
`may need to change the setting oi either or both of these registers
`to prevent the modem from entering Command Mode at an
`inappropriate time. Note that ii the modem is installed in an
`unattended answer environment, these two registers should
`usually be set to not enter Command Mode under any condition.
`
`It the answering site's modem is configured to ignore the DTR
`signal (S52=0), it will maintain the connection even it its DTE drops
`DTFi due to inactivity or some other condition.
`It this happens, the
`calling site must terminate the connection, and if desired re-initiate
`the call.
`
`was the connection dropped prematurely?
`it a connection has been made in non-packetized mode (SLW
`indicator is lit). the carrier signal may have been dropped due to a
`degradation in the line quality of the connection. Try placing the
`call again. The probability of getting the same connection is
`unlikely.
`
`ii the modem's S52 register is non-zero and its associated DTE
`drops DTR due to inactivity or some other condition, the modern
`will disconnect the cell.
`
`Rev. D
`
`Page 6-13
`
`

`
`

`
`Chapter 7
`Technical Support Procedures
`
`Telebit Corporation has made every effort to ensure that the
`product you have purchased is of excellent quality in all respects.
`Telebit products are rigorously tested and subjected to strict
`quality control procedures. However, if you experience
`difficulty in the use of this product, or it does not appear to
`operate correctly, we suggest doing the following:
`
`o
`
`0
`
`0
`
`Read this manual. It has been provided to help you
`configure and use your modem.
`
`Contact your dealer. Telebit authorized dealers are
`familiar with Telebit’s products and should be able to
`help you resolve any problems that you may encounter
`while setting up and using the modem.
`
`Finally, call Telebit’s Technical Support at (408) 734-
`5200. Before calling, please have all the following
`information about your unit available:
`
`Product Name
`
` Serial Number
`
`Dale of Purchase
`
`Place cl Purchase
`
`Ifyour product should require service, we will repair or replace it
`under the terms of our One Year Limited Warranty. Please read
`the warranty statement included in this chapter, and return the
`Warranty Registration Card at the back of this manual.
`
`Rev. E
`
`Page 7-1
`
`

`
`Technical Support Procedures
`
`When the One Year Limited Warranty period expires. Telebit
`will continue to service your product for the current applicable
`service fee. If you wish, you may extend your warranty
`protection for an additional two years by purchasing our
`Extended Warranty any time before the first year warranty
`expires. However, there is a cost savings if you purchase this
`option within 10 days of the original equipment purchase date.
`
`Return for Fiepair Procedure
`
`The following procedure describes how to return the unit to
`Telebit for repair. This procedure is applicable to both in or out
`of warranty repairs.
`
`1 .
`
`Call Telebit’s Technical Support Department at (408)
`734-5200 and describe the problem. Tell the technical
`support representative if your unit is or is not covered by
`warranty. They will issue you a RMA number.
`
`If the unit is covered by a warranty but not registered,
`you must submitproofofpurchase.
`Ifyou do not have proofofpurchase or your unit is not
`covered by the warranty, you must send the current
`repairfee with your unit.
`
`The technical support representative will provide you
`with that information and any further instructions if
`
`necessary.
`
`'2. Pack the unit in its original container or in a sturdy
`corrugated box using non-static material such as
`._
`newspaper as a cushion. Do not use highly static prone
`
`n material such plastic wrap or Styrofoam packing material
`(beads or peanuts) as they may further damage the unit in
`transit.
`
`3. Ship the unit only. Do not ship manuals, power supply or
`phone cord unless your technical support representative
`instructs you to do so.
`
`Page 7-2
`
`Rev. E
`
`7
`S;
`
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`
`

`
`Technical Support Procedures
`
`4.
`
`Include the following information with your unit:
`Name
`Address
`City. State, Zip Code
`Telephone Number
`
`RMA Number
`Description of the problem
`Current Repair Fee (if applicable)
`Ship the unit (for repair) freight prepaid to:
`
`5.
`
`Telebitcorporation
`1315 Chesapeake Terrace
`Su nnyvale. CA 94089
`Attention: Technical Support FIMA #
`
`We recommend that you insure the unit when shipped.
`Telebit will not accept units shipped C.0.D.
`6. Telebit will ship the repaired or replacement product at
`no cost to you to any destination in the U.S.A. Telebit
`will choose the carrier and method of shipment. If you
`desire some other specific form of conveyance or you are
`located outside the U.S.A., you must bear the cost of
`return shipment and other incidental costs.
`
`One Year Limited Warranty
`Telebit Corporation (“Telebit”) warrants the hardware products
`and all components thereof against defects in materials and/or
`workmanship for one (1) year from the date of your original
`retail purchase.
`
`Rev. E
`
`Page 7-3
`
`.. 7'"!
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`
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`
`

`
`Technical Support Procedures
`
`If you discover a malfunction or defect in materials or
`workmanship, Telebit, at its option, will repair or replace the
`product or component at no charge to you, provided you return it,
`as set forth below, during the warranty period. Telebit will
`furnish repair parts and replacement products on an exchange
`basis; all returned parts and products become Telebit’s property.
`Repairs and replacements may be either reconditioned or new.
`Telebit will make the final determination as to the existence and
`cause of any alleged defect. If a returned product shows “nO
`trouble found,” Telebit may assess a repair charge.
`
`Telebit does not warrant that any product will operate
`uninterrupted or without error. The warranty is contingent upon
`proper use of the product in the application for which it is
`intended. The warranty will be void on products which have
`been subjected to abuse, misuse, accident, alteration, neglect,
`unauthorized repair or installation; modified without Telebit’s
`approval; subjected to unusual physical or electrical stress; or
`used with a power supply other than the one provided with the
`product. Expendable items (such as lamps and fuses) are not
`warranted. This limited warranty is extended only to the original
`purchaser and is not assignable.
`
`THE WARRANTY AND REMEDIES SET FORTH
`ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL
`OTHERS, ORAL OR WRIT’l‘EN, EXPRESS OR
`IMPLIED. TELEBIT MAKES NO EXPRESS OR
`IMPLIED WARRANTIES INCLUDING, BUT NOT
`LIMITED TO, ANY IMPLIED WARRANTY OF
`MERCHANTABILITY OR FITNESS FOR A PAR-
`TICULAR PURPOSE, EXCEPT AS EXPRESSLY SET
`FORTH IN THIS LIMITED WARRANTY. SOFTWARE
`AND DOCUMENTATION IS PROVIDED ON AN ‘AS IS’
`
`BASIS. IN NO EVENT SHALL TELEBI'l‘ BE LIABLE
`FOR ANY INCIDENTAL OR CONSEQUENTIAL
`DAMAGES, COSTS OR EXPENSES ARISING OUT OF
`OR IN CONNECTION WITH THE USE OR PER-
`
`FORMANCE OF ANY PRODUCT DELIVERED
`
`HEREUNDER.
`
`Page 7-4
`
`Rev. D
`
`IV.
`
`I“IR
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`_ 3
`
`Technical Support Procedures
`
`NOTE: Some states do not allow the exclusion or limitation of
`implied warranties or liability for incidental or consequential
`damages for consumer products, so the above limitations or
`exclusions may not apply to you. ‘This warranty gives you
`specific legal rights, and you may also have other rights which
`vary from state to state.
`
`Please see Returnfor Repair Procedure in this chapter for
`specific instructions on returning products for service.
`
`You may extend the limited warranty period for an additional
`two (2) years by purchasing the Two Year Limited Warranty
`Extension. The limited warranty will then be for a total of three
`(3) years from the purchase date.
`
`Two Year Limited Warranty Extension
`
`You can extend your one year limited warranty for an additional
`two years by paying a reasonable one time fee. This fee guaran-
`tees repair or replacement of a faulty unit as often as required
`while it is under warranty subject to the same terms and condi-
`tions as the Telebit One Year Limited Warranty. The warranty
`period will then be for a total of three (3) years from the date of
`purchase. You may purchase this warranty extension at any time
`before the one year limited warranty expires.
`
`Ifyou purchase this warranty extension within 10 days of the
`date you purchase the modem, the price of the extended warranty
`is reduced. Contact your sales representative or Telebit’s
`Technical Support Department for the current pricing options for
`your product. Be prepared to provide them with the product
`name, serial number, date and place of purchase.
`You may also purchase this warranty extension by completing I
`Part 2 of the Warranty Registration Card and returning it to
`Telebit.
`
`Rev. D
`
`Page 7-5
`
`

`
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`
`Appendix A
`ASCII Code Chart
`
`NUL
`sou
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`snc
`3191. B
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`END
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`ACK
`::mL 1=
`GTFIL G BEL
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`as
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`am. J
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`CTRL L
`1=1=
`CTHL M ca
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`so
`CTRL 0 s1
`
`oo
`01
`02
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`04
`05
`05
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`10
`11
`12
`13
`14
`15
`
`16
`Due
`CTFIL P
`CTFIL 0 cm 17
`CTHL H D02
`13
`CTHL 5
`D03
`19
`CTFIL T me:
`20
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`21
`CTRL v
`sm 2
`CTFIL w ETB
`23
`CTRL :1
`CAN
`24
`CTHL Y
`EM
`25
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`sua
`26
`
`esc
`FS
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`
`27
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`29
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`31
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`-
`
`R‘-‘V-E
`
`Appendix A-1
`
`

`
`

`
`111
`
`VI]
`
`r/A
`
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`
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`
`rd
`
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`
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`
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`
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`
`Appendix B
`Interface Description
`
`Telephone Network Interface
`
`The modem is connected to the telephone network through an
`RJ1 1C modular connector. A second connector allows you to
`connect a telephone to the network for voice communication.
`Table B-1 presents a definition of the pins in the line connector.
`
`Table B-1. FIJ11C Llne Connector Pln Deflnltlons
`
`
`
`RS-232C Interface
`
`Communication between the modern and the local DTE is
`accomplished through a 25-pin RS-232C connector. Table B-2
`lists the RS-232C interchange signals and their associated pins.
`The modem is designed to operate as an asynchronous DCE
`device which only uses the primary interchange circuits defined
`in Figure B- 1. This figure shows the cable configuration for
`connecting the modem to a standard DTE device.
`
`ReV- D
`
`Appendix B-1
`
`

`
`- Interface Description
`
`For systems which require the modem to act as a DTE connected
`to a DCE device, a specially modified RS-232C cable must be
`used. Figure B-2 shows a recommended cable arrangement for
`this