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Loopback Tests

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Reference Guide for the Model XM128 ISDN Digital Modem Note: The LED lights up during the test and blinks if the test fails. The LNK LED light s up for a half second to indicate the success of the power-on self-test. Then the LNK LED becomes the normal physical layer (layer 1) active indicator. Loopback Tests The Model XM128 modem performs several loopback tests as part of its diagnostic capabilities. ISDN Loopback test (AT&T9) The AT&T9 command invokes an ISDN loopback test connection. The loopback point is in the S/T interface chip (Siemens 2086 chip) or the U interface chip (Siemens 2091 chip) just behind the line transformers. It checks almost every part of the Model XM128 modem and RS-232 cable except the passive front end of the ISDN S/T or U interface. During this test, data from the terminal or computer is sent through the DTE interface to the transmitter of the Model XM128 modem. Data is then packetized to the proper frame format according to the B channel protocol selected. Finally, the data is looped back to the receiver, depacketized, and sent through the DTE interface back to the terminal or computer screen. You can tell if anything is wrong by looking at the screen. The screen shows the data you sent to the Model XM128 modem. Loopback with Self-test (AT&T10) The AT&T10 command invokes an ISDN loopback connection with self-test. The data is generated by the Model XM128 modem and goes through the same path as the above loopback test does. The data pattern is printable ASCII characters, so you can see the result on the screen. The looped back data is compared with the transmitted data. Should an error occur, the LNK LED starts to flash. Any character sent through the DTE interface to the Model XM128 modem discontinues the test. 10-2 Troubleshooting

Section	Page
Reference Guide for the Model XM128 ISDN Digital Modem	1
Contents	5
Figures	11
Tables	13
Preface	17
Purpose	17
Conventions	18
Special Message Formats	18
Use of Enter, Type, and Press	18
Other Conventions	19
Related Publication	19
Table1. Manual contents (continued)	19
Table2. Manuals	20
Chapter1 Introduction	21
Features	21
Interface Options	23
Table11. Interface options	23
Front Panel	23
Table12. LED descriptions (continued)	24
Rear Panel	26
Table13. Rear panel components	27
Chapter2 Installation	29
Package Contents	29
Installing the Modem	30
Verifying Hardware Installation	31
Chapter3 Setup for Windows 95 and Windows NT 4.0	33
Selecting the Appropriate Windows 95 Driver (INF file)	33
Chapter4 Configuration	35
Configuring Your ISDN Line and Network	35
Configuring Your Modem Using a Terminal Program	35
Table41. Terminal programs	36
Understanding AT Commands	36
Table42. Supported AT command types	37
Quick Tips for Issuing AT Commands	37
Table43. Result codes commands	38
Using AT Commands to Verify Modem Response	38
Communication Speed Setup	38
Switch Type Setup for North America	39
Table44. Switches supported by the Model XM128 modem	39
1. Type ATP0 and press [Enter].	39
2. Type AT&WZ and [Enter] to save the settings.	39
SPID Setup for North America	40
Entering DNs	41
Setup for Europe and the United Kingdom	41
Table45. AT commands for setting protocols	42
6. Assign the appropriate MSN telephone numbers, using the AT commands in Table46.	42
Table46. AT commands for setting MSN	42
7. Type the AT command AT&W0Z0 to store the information into NVRAM.	42
Chapter5 Async to Sync PPP	43
Internet and Remote Access PPP and SLIP	43
Making Async to Sync PPP and SLIP calls	43
Keeping a Line Connection During Idle Time	44
Answering Async to Sync PPP calls	45
Multilink PPP	45
Making a call using Multilink PPP	45
Dialing Pre-stored Phone Numbers	46
Endpoint Discriminator	46
Table51. S85 register values	46
Call Bumping Dynamic Channel Allocation	47
Chapter6 ISDN Overview	49
Commands for Outgoing Calls	49
Dialing Out Using ISDN Mode	49
Dialing Out Using ISDN Mode Optional Speech Bearer Service	50
Dialing Out for Analog Adapter Port 1	50
Dialing Out for Analog Adapter Port 2	50
Manually Switching Communication Modes	50
Table61. Dialing commands	51
Placing the Call	51
Table62. Call placing commands	51
Commands for Incoming Calls	52
Digital Data	52
Determining the Packet Length	53
Answering a Call Using MSN	54
Table63. Commands for assigning ISDN numbers	54
Data over Speech Channel	55
Best-effort Call Answering	55
Table64. Best-effort call answering bit commands	56
Ambiguity Resolution Switch for Voice Calls	56
Multi Auto-Answering of Data Calls	56
Understanding ISDN Communication Protocols	57
Table65. ISDN protocol specifications	57
V.110 ISDN Communications	58
Answering a V.110 Call	58
Making a V.110 Call	58
Table66. V.110 configuration commands	58
V.120 ISDN Communications	59
Selecting V.120 for European ISDN (DSS1) Switch	59
Selecting V.120 for German National ISDN (1TR6)	59
Answering a V.120 Call	60
Making a V.120 Call	60
Configuring the V.120 Mode	60
1. Enter ATB20 (Select V.120 for communication).	60
2. Enter AT&E1 (Select 56K data mode).	60
1. Enter AT&W0 (save the settings to profile 0) [Profiles available: 0-3].	61
2. Enter ATZ0 (save stored settings as the power on settings to profile 0) [Profilesavailable:0...	61
Dialing in V.120 Mode	61
Making a Bundled Call with V.120	61
Identifying Your Line Provisioning	62
128 Kbps Speeds	63
Error Correction and Data Compression with V.120	63
X.75 ISDN Communications (Europe)	64
Answering an X.75 Call	64
Making an X.75 Call	64
Making a Bundled Call with X.75	65
Dialing Prestored Phone Numbers	66
Invoking V.42bis Data Compression	66
Bundle Connection with V.42bis Data Compression	67
Chapter7 Advanced ISDN	69
Call Control for DSS1	69
Control of Outgoing Service Indicator	70
Table71. S-register values and functions	70
Table72. Outgoing low-layer compatibility commands	71
Control of ISDN Phone Numbers and Subaddresses	71
Call Control for 1TR6 (Old German ISDN)	73
Control of Outgoing Service Indicator	73
Control of EAZ (ENDGERÄTEAUSWAHLZIFFER)	74
Command Function	74
Answering a Call	75
Answering a Call for DSS1	75
Answering a Call for 1TR6	76
Best-effort Call Answering	76
Ambiguity Resolution Switch for Voice Calls	77
Multi-Auto-Answering of Data Calls	77
Data Call Indication	78
Disable Inbound Call Connection	78
Point-to-Point Configuration	79
Placing a Call	79
Placing a Call for DSS1	79
Placing a Call for 1TR6	80
User-To-User Information	81
Chapter8 Analog Call Handling	83
AT Commands for Analog Calls	84
Table81. Frequently used AT commands	84
Table82. Frequently used AT commands (European switches)	84
Making and Receiving Analog Calls	85
Placing a Call from the Analog Adapter	85
1. Type ATDB714-693-0808 (dial the number).	85
2. Pick up the phone handset and wait for the remote device to answer.	85
3. Use ATDAs (ATDBs) to place a call for the analog adapter 1 (analog adapter 2).	85
Accepting an Incoming Call	86
Chapter9 Modem Upgrade	87
Upgrading with Flash EPROM	87
Table91. Definitions for the d modifier	87
Upgrade Instructions	88
1. Start any communications program that supports the X-modem Protocol.	88
2. Enter the command ATUPX.	88
3. Press Y.	88
4. Use the X-modem Protocol to upload the file ONETd.vvv to your Model XM128 modem. This step upd...	88
Kernel Mode	88
Chapter10 Troubleshooting	89
Power-on Self-test	89
Table101. Power-on self-test	89
Loopback Tests	90
ISDN Loopback test (AT&T9)	90
Loopback with Self-test (AT&T10)	90
B1/B2 Loopback with Self-test	91
The Diagnostic Command	91
Modem Reset	92
1. Hold the DATA/VOICE button down while turning the unit on.	92
2. Release the switch.	92
3. Turn power to the modem off and then back on again.	92
Using The Embedded Protocol Analyzer	92
Setting up the Embedded EPA	93
Capturing the Protocol Data	93
Table102. EPA Commands	94
Analyzing the Captured Data	94
Table103. Commands for analyzing captured data	94
Table104. Control key functions	95
Appendix A Technical Specifications	97
General Specifications	97
Network Protocols and Standards Compatibility	97
Security	97
Data Compression	98
Power Adapter	98
Physical Specifications	98
Environmental Specifications	98
Electromagnetic Emissions	98
Appendix B Security Functions	99
Security Types and Levels	99
TableB-1. Types of security	100
Level 1 Security	100
Level 2 Security	100
Level 3 Security	101
TableB-2. Levels of security	101
Setting and Modifying Passwords	101
Nonpassword Auto Callback Function	102
TableB-3. Auto callback commands	102
Appendix C AT Command Set Reference	103
Operation Mode of the DTE Interface	103
Simplex Mode	103
AT Command Descriptions	104
TableC-1. Basic AT command set (continued)	104
Description of ATI3 Output	109
TableC-2. ATI3 command output	110
TableC-3. Extended AT& command set (continued)	110
TableC-4. Extended AT* command set	114
Appendix D Status Registers and Result Codes	115
Viewing and Setting S-Registers	115
1. Type the AT command ATSr? to display the values stored in S-registers.	115
2. Type the &Vn command AT&Vn to view all of the S-register settings.	116
3. Type the command ATSr.b? to display the value of bit b of S-register r.	116
Setting S-Registers	116
1. Type the command ATSr=n (range 0-255) to change the value in S-register r to value n.	116
2. Type the command ATSr.b=n (range 0-1) to change the value in a specific bit (b) of S-register r.	116
Examples for Setting S-Registers	116
1. Read the value from S38 using the ATS38? command.	116
2. Use TableD-1 to convert the decimal bit value to binary.	117
TableD-1. Binary conversion table	117
3. Use TableD-2 to perform a logic OR operation with the value to set bit 3 to 1 (binary).	117
TableD-2. Setting bit 3	117
4. Use TableD-2 to invert the value using a logic NOT operation and then perform a logic AND ope...	117
5. Using the resulting decimal value, type the ATS38=n command to set the register.	117
S-Register Descriptions	118
TableD-3. Basic S-registers ATSn=x	118
TableD-4. Extended S-registers ATSn=x (continued)	119
ATXn Result Code Option Table	133
TableD-5. ATXn command setting options (continued)	133
Result Code Chart Symbol Reference	135
TableD-6. Result code chart	135
Result Code Field Descriptions	136
TableD-7. Result code field descriptions	136
Connect Strings for Error Corrected Connections	137
TableD-8. Connect strings	137
Appendix E Connector Pin Assignments	139
RJ-45 Plug and Connector	139
TableE-1. RJ-45 plug and RJ-45 connector pin assignments for the S/T interface	140
TableE-2. RJ-45 plug and RJ-45 connector pin assignments for the U interface	140
RJ-11 Plug and Connector	141
TableE-3. RJ-11 connector pin assignments	141
Appendix F Serial Port Interface	143
RS-232 Serial Interface	143
TableF-1. Serial port interface (continued)	143
Asynchronous Cable Connections	144
TableF-2. Asynchronous flow control cable connection	144
Appendix G ISDN Reference	145
ISDN Overview	145
Basic Rate Interface	146
Out-of-Band Signaling	146
Terminal Adapter or Digital Modem	147
ISDN Basic Rate Interface Points	147
SPID Setup	148
Ordering ISDN Service	148
Order Form for AT&T 5ESS Switch (NI-1 ISDN)	150
TableG-1. ISDN line configuration	150
Order Form for DMS-100 Switch (NI-1 or Custom ISDN)	151
TableG-2. ISDN line configuration	151
Order Form for EWSD (NI-1 ISDN)	152
TableG-3. ISDN line configuration	152

Match case Limit results 1 per page

Reference Guide for the Model XM128 ISDN Digital Modem

10-2

Troubleshooting

The LNK LED light s up for a half second to indicate the success of the power-on self-test. Then

the LNK LED becomes the normal physical layer (layer 1) active indicator.

Loopback Tests

The Model XM128 modem performs several loopback tests as part of its diagnostic capabilities.

ISDN Loopback test (AT&T9)

The AT&T9 command invokes an ISDN loopback test connection. The loopback point is in the

S/T interface chip (Siemens 2086 chip) or the U interface chip (Siemens 2091 chip) just behind the

line transformers. It checks almost every part of the Model XM128 modem and RS-232 cable

except the passive front end of the ISDN S/T or U interface.

During this test, data from the terminal or computer is sent through the DTE interface to the

transmitter of the Model XM128 modem. Data is then packetized to the proper frame format

according to the B channel protocol selected. Finally, the data is looped back to the receiver,

depacketized, and sent through the DTE interface back to the terminal or computer screen. You can

tell if anything is wrong by looking at the screen. The screen shows the data you sent to the

Model XM128 modem.

Loopback with Self-test (AT&T10)

The AT&T10 command invokes an ISDN loopback connection with self-test. The data is

generated by the Model XM128 modem and goes through the same path as the above loopback test

does. The data pattern is printable ASCII characters, so you can see the result on the screen. The

looped back data is compared with the transmitted data. Should an error occur, the LNK LED

starts to flash. Any character sent through the DTE interface to the Model XM128 modem

discontinues the test.

Note:

The LED lights up during the test and blinks if the test fails.