Telebit T2500 User manual

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Trademarks
Telebit, TrailBlazer, TrailBlazer PC, Packetized Ensemble
Protocol, Adaptive Duplex, and Dynamically Adaptive
Multicarrier Quadrature Amplitude Modulation (DAMQAM)
are trademarks
of Telebit Corporation.
Hayes is a registered trademark, and V-series and Smartcom III
are trademark
of Hayes Microcomputer Products, Inc.
Touch-Tone is a registered trademark
of American Telephone
and Telegraph.
MNP is a trademark
of Microcom, Inc.
Other Brands or product names are trademarks or registered
trademarks
of theirrespective holders.
Firmware Copyright Notice
This product contains firmware which has been copyrighted by
Telebit Corporation, Sunnyvale, CA. All rights are reserved.
YOUR RIGHTS OF OWNERSHIP ARE SUBJECT TO THE
LIMITATIONS AND RESTRICTIONS IMPOSED BY THE
COPYRIGHT LAWS (TITLE 17, UNITED STATES CODE).
IT IS AGAINST THE LAW TO COPY, REPRODUCE, OR
TRANSMIT (INCLUDING, WITHOUT LIMITATION, ELECTRONIC
TRANSMISSION OVER ANY NETWORK) ANY PART OF THE
FIRMWARE.
THIS IS NOT A FULL STATEMENT OF THE COPYRIGHT LAWS.
FOR A COMPLETE STATEMENT OF THE RESTRICTIONS
IMPOSED ON YOU UNDER THE COPYRIGHT LAWS OF THE
UNITED STATES, SEE TITLE 17, UNITED STATES CODE.
Rev.D
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Limitation of Warranty and Liability
Telebit Corporation has prepared this document for use by
Seller's personnel, customers, and licensees. The information
contained in it is the property
of Telebit Corporation and shall
not
be copied, photocopied, translated or reproduced in any
electronic
or machine readable form, eitherin whole or in part,
without the written approval
of Telebit Corporation.
Telebit Corporation
or Seller shall not be responsible for any
loss, cost,
or damage caused by reliance on these materials.
Telebit Corporation reserves the right to, without notice,
modify
or revise all or part of this document and/or change
product features
or specifications.
Telebit, Seller,
or any dealer distributing this product, makes
NO WARRANTY, EXPRESSED or IMPLIED, with respect to this
manual, and any related items, its quality, performance,
merchantability,
or fitness for any particular use, Itis solely
the purchaser's responsibility to determine its suitability for
any particular purpose.
Telebit Corporation and Seller will in no event
be held liable
for direct, indirect,
or incidental damages resulting from any
defect
or omission in this manual, or any other related items
and processes, including, but not limited to, any interruption
of
services, loss of business or anticipatory profits, or other
consequential damages.
Copyright © 1991 Telebit Corporation.
Printed in U.S.A.
11
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r FCC Standards
This equipment generates and uses radio frequency energy,
and
if not installed and used in strict accordance with the
instructions in this manual, may cause interference to radio and
television reception. It has been tested and found to comply
with the limits for a Class A computing device underPart 15
of
the FCC Rules, which are designed to provide reasonable
protection against such interference in a commercial
installation. However, there is no guarantee that interference
will not occur in a particular installation.
If this equipment
does cause interference to radio
or television reception, which
can be determined by turning the modem on and off, the user is
encouraged to try to correct the interference by one
or more of
the following measures:
• Reorient the receiving antenna.
• Move the modem away from the receiver, or relocate
the receiver with respect to the modem.
• Plug the modem into a different outlet so that the
modem and receiver are on different branch circuits.
If necessary, you should talk to your dealer or any experienced
radio/television technician for additional suggestions. You
may find a booklet prepared by the FCC entitled "How to
Identify
and Resolve Radio-TVInterference Problems" helpful
in resolving any problems. This booklet is available from the
U.S. Government Printing Office, Washington DC 20402,
Stock Number 004-000-00345-4.
Rev. 0
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FCC Notice to Users
1.
2.
3.
4.
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Upon request only, you must notify your telephone
utility company (telco)
of your intentions to install or
permanently remove an FCC Part 68 registered device,
and provide them with the following information:
•The telephone number to which the equipment will
be connected.
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•FCC registration numberER95W5-17716-MO-E.
•Ringer equivalence numbers
O.2A and O.3B.
•Modularjacknumber USOC
RJIIC or RJ45S.
The equipment may not be used on telco coin-operated
telephone lines. Party lines and privately owned coin-
operated telephone lines are subject to local and state
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regulatory policies, andpossible additional state special
features.
The telephone company has the right to make changes
to their network which may affect the operation
of your r
equipment, provided you are given adequate advance
written notice to permit correct operation.
In the event
of operational problems, disconnect your L
unit by removing the modular jack from the telco's
termination.
If yourregular phone still works properly, b
your modem may need to be returned for repairs in or
out of warranty. If after disconnecting the equipment,
your regular telephone does not operate correctly,
notify your telephone company that they may have a
problem, and request prompt service at no cost to you
the user.
If a problem is found in premises wiring not
telco-installed, you will be subject to an authorized
service charge.
If a fault is found in telco-installed
wiring, you may be subject
to a charge for the service
call.
Rev.D
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5.
6.
Rev. 0
Except as instructed in the Diagnostics and Service
chapter of this manual, the user may not under any
circumstances (in
or out of warranty) attempt any
service, adjustments
or repairs on this unit. It must be
returned to the factory
or authorized service agency for
all such work. Refer to your
Warranty Registration and
Customer Service Information at the end
of this manual
for instructions
on returning your modem for repair.
If the equipment is to be placed behind a PBX or KTS
system, it comes under a special FCC category
requiring the written approval
of the PBX/KTS owner
as well as additional
FCC registration.
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Introduction
I
nsta Ilation
Using the Modem
Conventional Command Mode
Configuration Guidelines
Command Descriptions
Register Descriptions
Enhanced
Command Mode
Configuration Guidelines
Command Descriptions
Register Descriptions
Di nostics and Service
Technical Su rt Procedures
Appendices
Glossary
Index
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vii

Contents
Cha pter 1 In troduction........................................................1·1
Chapter 2 Installation.........................................................2-1
Equipment CheckList................................................2-1
Installation CheckList................................................2-2
Connecting the ACPowerCord..................................2-3
Connecting the RS-232C Cable ..................................2-4
Connecting the TelephoneLine ..................................2-4
Connecting a Telephone .............................................2-5
AfterCompleting the Installation................................2-5
Chapter 3 Using the Modem .......................................3-1
MemoryOrganization ................................................3-1
: DefaultConfigurationSelection .................................3-3
FrontPanel Controls and Indicators ............................3-5
Selecting Conventional
or Enhanced Command Mode3-8
Enhanced CommandMode........................................3- 8
Conventional CommandMode...................................3-9
PEPSDLCMode ...................................•..................3-10
SDLC Configuration Procedure................................3-10
CommandMode Operation ......................................3-12
ResultCodes.............................................................3-13
Using theDial Command..........................................3-13
Using the AutoAnswerFeature ................................3-14
Changingfrom Voiceto DataConnection ................3-14
Using the CallbackSecurityFeature .........................3-15
Chapter 4 Conventional Command Mode .................4-1
ConfigurationGuidelines ...........................................4-1
Attended
or UnattendedMode....................................4-2
TransmissionMode Considerations............................4-2
SerialPortInterface SpeedandFlow Control .............4-4
SerialPortInterface Speed....................................4-4
SerialPortFlow Control .......................................4-4
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RS-232 Control SignalInterpretations ........................4-5
DCD Signal Handling...........................................4-5
DTRSignal Interpretation ....................................4-5
RTS/CfS SignalHandling ...................................4-6
DSRSignalHandling ...........................................4-6
FileTransferProtocol Support....................................4-6
MNPSupport..............................................................4-7
Command Descriptions............................................ 4-9
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ECMAccess Character .....................................4-9 r
A Answer............................................................4-10
B(n) 1200 bps Mode Selection ................................4-10
D(n) Dial .................................................................4-11
E(n) Echo ON/OFF ................................................4-12
F(n) Echoplex ON/OFF..........................................4-12
H(n) Hook ON/OFF ................................................4-13
I(n) Information .....................................................4-13 L
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L(n) SpeakerVolume ..............................................4-13
M(n) SpeakerON/OFF ............................................4-14
N(n) Transmission SpeedNegotiation ....................4-14
O(n) On-line............................................................4-15
Q(n) QuietEnable ...................................................4-15
S(n)=(x) SetRegister ...............................................4-15
S(n)? Read Register .................................................4-16
V(n) Verbose ON/OFF............................................4-16
W(n) Negotiation ProgressReporting ......................4-17
X(n) ResultCode andDialing Capabilities..............4-17
Y(n) DisconnectonBreak .......................................4-18
Z(n) Reset...............................................................4-19
&C(n) DataCarrierDetectControl ...........................4-19
&D(n) DataTerminal Ready Interpretation ..............4-20
&F RecallFactoryConfiguration Parameters......4-20
&G(n) GuardTone Selection ...................................4-21
&J(n) JackType Selection.......................................4-21
&K(n) Flow Control ................................................4-21 r -
&L(n) LineType Selection .....................................4-22 L
&M(n) CommunicationMode Selection..................4-23
&P(n) PulseDialingMakeIBreak Ratio..................4-24
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&Q(n) Communication ModeSelection..................4-24
&R(n) RTS/CfS Signal Interpretation ....................4-25
Contents 2 Rev. 0

&S(n) DataSetReady Interpretation.......................4-26
&T(n) TestFunction ................................................4-26
&
V View Active Configuration andUserProfiles ..4-28
&W(n) Write Configuration Parameters ..................4-28
&X TransmitClockSource ................................4-29
&Y(n) DefaultUserProfile Selection......................4-29
&Z(n)=(x) SetNumberDirectory ............................4-29
RegisterDescriptions..............................................4-31
SO Answeron Ring Number .................................4-31
S1 Count of Rings .................................................4- 31
S 2 Escape Character .............................................4- 31
S3 Carriage Return Character ...............................4-32
S4 LineFeedCharacter.........................................4-32
S5 Backspace Character........................................4-32
S6 WaitTime Before Dialing................................4-33
S7 WaitForCarrierlDialTone Time.....................4-33
S8 PauseTimefor Comma ...................................4-33
S9 CarrierDetectTime .........................................4-33
S10 CarrierLoss to DisconnectTime......................4-34
S 11 TouchToneTiming .........................................4-34
S12 Escape Sequence GuardTime..........................4-34
S 18 TestTermination Timer...................................4-34
S25 DTRDelayTiming ..........................................4-35
S26 RTS to CTS DelayInterval ..............................4-35
S36 Negotiation FailureTreatment .........................4-36
S37 Transmission Mode .........................................4-36
S38 Delay BeforeDisconnecting ............................4-37
Chapter 5 Enhanced Command Mode..................•....5-1
ConfigurationGuidelines ...........................................5-1
AttendedorUnattendedMode ....................................5-2
TransmissionMode Considerations............................5-4
V.42 and MNPError Control Protocol Support ..........5-5
DataCompression ......................................................5-7
MNPDataCompression .......................................5-7
V.42bis LAP-MDataCompression ......................5-8
PEPDataCompression ...............................................5-8
SerialPortInterface Speed andFlow Control .............5-8
SerialPortInterface Speed....................................5-9
SerialPortFlow Control .....................................5-11
Rev.D Contents 3

RS-232 Control Signal Interpretations ......................5-12
DTRSignal Interpretations ................................5-13
DSRSignalHandling .........................................5-13
DCD SignalHandling ........................................5-14
crsSignal Handling .........................................5-14 I
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BreakSignalandEscape SequenceHandling ...........5-15
FileTransferProtocols Support ................................5-16
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SDLC Support ..........................................................5-17
Transparent Synchronous Support ...........................5-17
BitSynchronousDialing in SDLC Support...............5-18
CommandDescriptions .......................................... 5·19
A Answer ............................................................5-19
C(n) Tum CarrierON/OFF.......................................5-20
D(n) Dial...................................................................5-20
E(n) Echo ON/OFF ..................................................5-22
F(n) Echoplex ON/OFF............................................5-22 L
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G GoToVoice ..................................................5-23
H(n) Hook ON/OFF ..............................................5-23
I(n) Infonnation ...................................................5-23
M(n) SpeakerON/OFF...........................................5-25
N(n)=(x) Set NumberDirectory ...............................5-25
N(n)? Display Number ............................................5-26
N? Display NumberDirectory andS Registers...5-26
o On-line ..........................................................5-26
Q(n) QuietEnable..................................................5-27
S(n)=(x) SetRegister ...............................................5-28
S(n)? Read Register................................................5-28
U Update SystemPassword ..............................5-28
V(n) Verbose ON/OFF .........................................5-29
W(n) Negotiation Progress Reporting....................5-29
X(n) Result Code BasiclExtended ........................5-30
Y(n) Disconnecton Break.....................................5-30
Z(n) Reset ............................................................5-31 L ,
&B Blind Command...........................................5-31
&E(n) Recall EEPROM OperatingParameters .......5-32
&F(n) Recall Factory Configuration Parameters ....5-32 L _
&N(n) DisplayEEPROM OperatingParameters ....5-33
&P(n) PulseDialingMakelBreak Ratio..................5-33 L
&R(n) Force Retrain or Renegotiate........................5-33
Contents 4
Rev. 0

&T(n) TestFunction ...............................................5-34
&W(n) Write Configuration Parameters ..................5-36
% Remote Modem Access ..............................5-37
Register Descri ptions..............................................5-39
SO Answeron Ring Number ............................5-39
SI CountofRings ............................................5-39
S2 Escape Character ........................................5-40
S3 Carriage Return Character ..........................5-40
S4 Line Feed Character....................................5-40
S5 Backspace Character...................................5-40
S6 Dial Tone WaitTime ..................................
5-41
S7 WaitForCarrierTime................................. 5-41
S8 Pause Time for Comma............................... 5-41
S9 CarrierDetectTime .................................... 5-41
S 10 CarrierLoss to DisconnectTime ................. 5-41
S 11 Touch Tone Timing ....................................5-42
S 12 Escape Sequence GuardTime ....................5-42
S 18 Test Termination Timer..............................5-42
S25 DTRDelayTiming ....................................5-42
S26 RTS to CTS Delay Interval ........................5-43
S 38 Delay Before Disconnecting ......................5-43
S41 Inactivity Timer .........................................5-44
S45 Remote Access Enable...............................5-44
S46 Callback Security.......................................5-45
S47 DSRlDCD Delay Time ..............................5-46
S48 EightBit Comparison ................................5-46
S49 Product Identification String Redefinition .5-47
S50 Transmission Mode ...................................5-48
S51 Interface Speed .........................................5-50
S52 DTR Interpretation....................................5-52
S54 Break Signal Interpretation .......................5-53
S55 Escape Character/Sequence Interpretation 5-54
S56 XON Character .........................................5-54
S57 XOFF Character........................................5-55
S58 Flow Control Used byDTE.......................5-55
S59 Prompt Character ......................................5-57
S61 SpeakerVolume........................................5-57
S62 BreakLength Time ...................................5-57
S63 Command Mode Selection........................5-57
S64 Dial/Answer Sequence Abort....................5-59
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Rev.D
Contents 5

S65
S66
S67
S68
S69
S70
S71
S72
S73
S74
S75
S76
S77
S78
S90
S91
S92
S93
S94
S95
S96
S97
S98
S100
S101
S102
S104
S105
S106
S107
S108
S110
S111
S112
S121
S130
S131
S150
S151
Contents 6
XON/XOFF Failsafe .................................5-59
Lock Interface Speed ................................5-60
crs Signal Interpretation .........................5-61
Flow Control Used by DCE ......................5-62
XON Signal Handling ...............................5-63
Instantaneous Transmit Rate ... ..................5-63
Transmit Bits Per Channel ........................5-64
Instantaneous Receive Rate ......................5-64
Receive
Bits Per Channel ..........................5-64
Received
Packets Retransmitted ...............5-65
Packets Accepted ......................................5-65
Equivalent Line Noise Profile ...................5-65
Frequency Offset ......................................5-65
Line Quality ... ...........................................5-66
CCITTlBell Mode Select.............................5-66
Guard Tone Selection...................................5-67
Answering Sequence Selection .................... 5-67
V.32 AC Transmit Duration ......................... 5-68
Transmission SpeedNegotiation..................5-68
MNP Operating Mode ..................................5-69
MNP Data Compression Enable ...................5-70
V.42LAP-MEnable ....................................5-71
V.42bis Data Compression ........................... 5-71
Answer in Originate Mode ...........................5-72
Continuous Answer/Originate .....................5-72
Auxiliary Telco Lead Setting .......................5-73
Automatic Dialing Options ..........................5-73
TID SwitchEnable.......................................5-75
V.42 Detection Enable .................................5-75
Detection Timer ...........................................5-77
V.42
Match Count ....................................... 5-77
PEP Data Compression Enable ....................5-78
File
Transfer Protocol Support .....................5-78
Kermit Mark Character ................................5-80
Echo Suppressor Compensation .................. 5-81
Data Set Ready Interpretation ...................... 5-81
Data Carrier Detected Interpretation ............5-82
Async/Sync
Mode Selection ........................5-83
SDLC Interface Speed .................................5-84
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S152
S153
S154
S155
S157
S158
S160
S161
S162
S163
S164
S169
S222
S255
SDLCSwitchedlNonswitched .....................5-86
SDLCFulVHalfDuplexMode Selection .....5-86
Synchronous ClockOptions ........................5-87
NRZ/NRZIDataEncoding ..........................5-87
SDLCDisconnectionDelayTime ...............5-88
SDLC DSR Delay Time...............................5-88
SDLCFrame RetransmitLimit....................5-89
SDLCDeviceTimeout ................................5-89
SDLC NonproductiveTimeout....................5-90
SDLC RetransmitTimeout ..........................5-90
SDLCPrimary Poll Rate ..............................5-90
SynchronousDialing Command Set Enable 5-91
ECM Access Character................................5-92
DefaultUserProfile Selection......................5-93
Chapter 6 Diagnostics and Service ...........................6-1
Diagnostic Tests .........................................................6-1
UserAssuranceTests..................................................6-2
Nonvolatile MemoryTest...........................................6-2
TelephoneDialerTest.................................................6-2
TelephoneLineRelay Test .........................................6-3
RingDetectTest .........................................................6-3
Troubleshooting .........................................................6-4
Chapter 7 Technical Support Procedures .................7-1
Return for RepairProcedure .......................................7-2
TwoYearLimitedWarranty.......................................7-3
TwoYearLimitedWarranty Extension ......................7-5
Appendices
Appendix A ASCII Code Chart................................. A-l
Appendix B InterfaceDescription .............................B-1
Appendix C CommandCross Reference ...................
C-l
AppendixD ResultCodes ......................................... D-l
AppendixE T2500 to T2500 Interconnection............ E-l
AppendixF LeasedLine Considerations ................... F-l
AppendixG Technical Specifications........................ G-l
Rev. D
Contents 7

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List of Figures
2-1 T2500 Cable Connections........................................... 2-3
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3-1 T2500Memory Organization .....................................3-2
3-2 DefaultSetDisplay .....................................................3-4
B-1 Asynchronous RS-232C Cable Diagram.................... B-5
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B-2 Special Asynchronous RS-232C CableDiagram .......B-6
B-3 SDLC & Transparent Synchronous RS-232C Cable ........
Diagram .....................................................................B-9
F-1 Gain ControlResistorLocastion.................................F-2
List of Tables
3-1 FrontPanel Control Switches .....................................3-5
3-2 FrontPanel Status Indicators ......................................3-7
3- 3 SDLC Configuration Cross Reference ...................... 3-11
5-1 AttendedMode Configuration ....................................5-2
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5- 2 Unattended Mode Configuration ................................ 5- 3
5-3 V.42 Error Control......................................................5-6
5-4 V.42 Error Control ....................................................5-76
5-5 Transparent Synchronous Cross Reference...............5-85
6-1 Modem Preconfiguration ............................................ 6-5
6-2 Placinga Call..............................................................6-6
6-3 Answering aCall ........................................................6-9
6-4 Call In Progress.........................................................6-12
B-1 PhoneLine ConnectorPinDefinition......................... B-1
B-2 RS-232 ConnectorPin Assignments ..........................B-2
D-1 Conventional Command Mode Result Codes ............D-2
D-2 ErrorControl Call Progress Result Codes ..................D-3
D-3 Enhanced CommandMode Result Codes ..................D-4
D-4 MNP Extended Result Codes .....................................D-5
D-5 PEPExtended Result Codes ......................................
D-5
Glossary ............................................................Glossary 1
Index ..................................................................... Index 1
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Contents 8 Rev.D
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Chapter 1
Introduction
This manual provides acomprehensive guide for setting up and
using theTelebitT2500 modem. The manual is intendedfor
computer and terminal users who have a basic understanding
of datacommunications.
You can save time by following the instructions in the T2500
FastStartGuide, which is a separate booklet provided to help
you get started using your modem
as quickly as possible. If you
have special requirements orexperience
any problems while
using the T2500 FastStartGuide, referto this manual for
additional information.
The T2500 modem overcomes the limitation ofdial-up tele-
phone lines by using Packetized EnsembleProtocol™ (PEP)
modulation. PEP analyzes the quality ofthe connection at
511
separate frequency points and compensates for line impairments
which may exist. The modem's advanceddesign is ideally
suited for high speedfile transferoperations. Accordingly, you
will gain the most benefits
in line costs and time savings when
transferring large files.
Some of the major features offered by the T2500 modem are
discussed in the following sections:
V.42 Error Control Protocol Support
The T2500modem supports V.42 errorcorrection and detection
protocol standard that provides error-free transmission overa
standardfull-duplex, V.32, V.22bis, V.22, and Bell 212A
connection.
Rev. 0 Page
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