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Dataplex DPX-213, Руководство пользователя

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Section 7 

TESTING and DIAGNOSTICS 

 

 

 

Copyright (C) Dataplex Pty Ltd 

7-3 

 

7.4  Remote Digital Loopback (RDLB) 

 

This  test  will  verify  the  receive  and  transmit  sections  of  both  DPX-213  modems  and  the 
phone line in both switched network and leased line operation.  
 
The Remote Digital Loopback test is initiated by typing the escape sequence followed by 
the command 

at&t6K

. 

 
In  asynchronous  modes,  you  will  now  get  one  of  two  messages  on  your  screen:  "LOOP 
GRANTED" if the remote modem is able to support loopback testing or "RDL DENIED" 
if  the  remote  modem  either  cannot  support  RDLB  or  has  previously  issued  the  AT&T5 
command.  

 

The DPX-213 modem which is in RDL mode will display "RDL ACCEPTED" if an RDL 
request  has  been  received  or  one  or  more  "RDL  DENIED"  messages  if  an  RDL  request 
was received but AT&T5 was set. 

 

During  loops,  the  OH  LED  will  flash.  Once  the  loop  is  established,  all  data  sent  by  the 
local DPX-213 will be echoed by remote modem and appear on your terminal. 

Exit  the  test  by  issuing 

+++

  escape  sequence  then  entering 

at&t0K

. 

Return to the data state with the ATO command. 
 

 

 

 

Figure 7.2 

Remote Digital Loopback 

 
 
 
 
 
 
 
 
 
 
 

Содержание DPX-213

Страница 1: ...DPX 213 LOW POWER DATA MODEM USER MANUAL 2400 1200 300bps MNP 5 Data Leased Line Dial Network Modem...

Страница 2: ...ply cable must be connected to the power source via a disconnection device or an over current protection device A circuit breaker rated 1A 100 VDC will satisfy both requirements Observe correct polari...

Страница 3: ...nnections 2 4 2 6 Setting Your PC for Speed and Character Format 2 4 2 7 Making a Connection 2 5 2 8 Closing a Connection 2 6 2 9 Call Establishment Sequence 2 6 2 10 Trouble Shooting 2 7 3 0 BEFORE Y...

Страница 4: ...TA TRANSFER 6 1 6 1 Error Control 6 1 6 2 Flow Control 6 2 6 3 Flow Control Buffers 6 2 6 4 Microcom Networking Protocol 6 4 6 5 Error Free or Not At All 6 5 6 6 Constant Speed Interface 6 5 6 7 File...

Страница 5: ...1 Telecom 604 Plug 5 5 Figure 6 1 Flow Control Buffers 6 2 Figure 7 1 Local Analog Loopback 7 2 Figure 7 2 Remote Digital Loopback 7 3 Figure D 1 RJ 11 Connector Wiring D 1 TABLES Table 2 1 Front Pan...

Страница 6: ...VI Document No 113 213 01 Rev 1 0 THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 7: ...unit MNP 4 error correction and MNP 5 data compression permit error free transmission of data at up to four times the throughput of basic 2400 bps modems The DPX 213 supports five international speed...

Страница 8: ...uding password security synchronous support leased line operation extended character set support and remote configuration Section 6 Data Transfer describes advanced features such as error correction d...

Страница 9: ...ctor Small size MNP error correction data compression Constant speed interface from 300 to 9 600 bps Automatic terminal speed detection from 300 to 9 600 bps Data operation at 300 1200 and 2400 bps Au...

Страница 10: ...INTRODUCTION Section 1 1 4 Copyright C Dataplex Pty Ltd THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 11: ...ssue a default command string to set up the modem Before altering this default setup check the software operations manual and Section 4 Command Set Figure 2 1 Rear Panel Layout The rear panel of the D...

Страница 12: ...Connecting the DPX 213 to the Telephone Line Remove your telephone from its wall socket you may need a flat bladed screwdriver for this and plug one end of the supplied cable into the socket labelled...

Страница 13: ...interface configured for DTE operation The connections needed for dumb terminals PC s and asynchronous operation are described in Appendix D NOTE When connecting the RS 232 cable to the PC DO NOT conn...

Страница 14: ...e system up and start your communications or terminal emulation package To check that keyboard characters are reaching the DPX 213 the TD LED must flash with every keystroke Press the K key Each time...

Страница 15: ...ct it is possible to make errors by loading a conflicting configuration causing unpredictable operation If you suspect this has happened turn the power off wait about ten seconds and then turn the pow...

Страница 16: ...NOTE If data is present then one of the Dumb modes should be used AT D2 2 9 Call Establishment Sequence The modem placing the call is termed the originating modem and the modem at the other end is te...

Страница 17: ...you are sure you have the correct cables terminal speed and ASCII character format but are unable to get the OK response from typing AT the DPX 213 may have an invalid set up string stored in the NVR...

Страница 18: ...INSTALLATION Section 2 2 8 Copyright C Dataplex Pty Ltd THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 19: ...arriage return The factory defaults assume you are going to use the modem for asynchronous operation on the dial network at the fastest speed the line or modem can accommodate The character format is...

Страница 20: ...cations to the line connector as shown in Appendix D 3 5 Speed Matching There are several forms of speed matching used in the DPX 213 The autobaud feature automatically senses the terminal speed from...

Страница 21: ...600 bps to be automatically supported The modem will normally attempt to establish all calls at 2 400 bps unless commanded otherwise or the remote modem cannot support this speed The modem automatical...

Страница 22: ...BEFORE YOU START Section 3 3 4 Copyright C Dataplex Pty Ltd THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 23: ...on S Registers These are storage locations where various operating parameters are stored These parameters control various modem features such as the number of rings to count before answering an incomi...

Страница 24: ...next command During this time the DPX 213 is resetting its internal registers in preparation for the next command If communications equipment sends an AT sequence during this 750 microsecond period th...

Страница 25: ...Result Codes After the DPX 213 has executed each command line it returns a result code to show the status of the command The result is in the form of digits 0 to 233 or text Results displayed in digi...

Страница 26: ...d State the modem buffers command characters from the DTE until a carriage return K character is received The modem will buffer up to 48 characters not including the initial AT characters If more than...

Страница 27: ...nsmission Data State to local control On line Command State are described as follows 1 Escape Sequence Detected pause pause The modem will leave the data state and execute the following sequence send...

Страница 28: ...ther options to exit the On line Command State are 1 ATH Command Received The modem will execute the following sequence send an OK message to the DTE go on hook hang up and return to Idle State 2 ATZ...

Страница 29: ...m will go on hook and return to Local Command State The modem ignores all commands in a command line following the Answer command ATB BELL CCITT Select Parameters 0 or 1 Default 0 CCITT Modulation Thi...

Страница 30: ...e dial modifiers are Nn P T and comma The DPX 213 ignores any other characters in the dial command These can be freely used to improve readability atd1234567K is equivalent to atd 03 123 4567K Enterin...

Страница 31: ...ber If ATX4 check for dial tone is set the DPX 213 will dial the first digit of a dial string in tone mode and recheck for dial tone If dial tone is still present the entire number will be dialled in...

Страница 32: ...a connection is established forces DTE speed to line The DPX 213 will autorange on both answer or originate Set ATF0 at the answering modem and it will adjust speed automatically to accommodate the i...

Страница 33: ...ing n2 Dial Number 3 DTR Raised String n3 Dial Number 4 Keyboard Activity Alarm String n4 Dial Number 5 Password Storage n5 Dial Number 6 Password Storage n6 Dial Number 7 Password Storage n7 Dial Num...

Страница 34: ...ling messages This command controls whether or not the modem sends messages and result codes such as OK to the DTE as it executes commands some software packages may not recognise call progress messag...

Страница 35: ...ling Parameters None Default None This command enters the tone dial mode and awaits the next ATDnnnn command Typing attK is a valid entry Additionally typing T within a dial string such as the followi...

Страница 36: ...detect dial tone The available response codes that are selected by the ATXn command are shown below Table 4 2 Response Codes Digit Code Description 0 OK Command executed without error 1 CONNECT Modem...

Страница 37: ...evel and setting of jumper J5 The modem may be woken from this state by either raising the DTR activity on DTE Txd Ring detection or power cycle When the modem is in standby mode the unit is effective...

Страница 38: ...orrupt characters to the DTE on the non MNP modem Therefore the default setting is MNP off NOTE If MNP is to be used both modems must support it and at least one modem must request it AT F Load FACTOR...

Страница 39: ...hat of the actual line connection as soon as the call is established For example if your terminal is set for 2400 bps and the DPX 213 can only establish a link at 1200 bps the message CONNECT 1200 wil...

Страница 40: ...e DTE must be careful not to overflow the buffers or data will be lost AT K1 Xon Xoff q s enabled The modem can control the flow of data by issuing an Xoff to the DTE The Xon and Xoff characters can b...

Страница 41: ...face Setting AT D0 with AT L1 forces the DPX 213 on line immediately regardless of the DTR status This is the recommended mode for interworking with the DPX 224 or TEL 424 modems Configure the modem f...

Страница 42: ...asynchronous terminal dialling Use an asynchronous terminal to place the call and then change to Synchronous Mode once the call is placed AT M3 Synchronous Mode 3 DTR dial synchronous Enabling this m...

Страница 43: ...s may be inserted in the data stream and corrupt a binary file transfer Alternately an Xoff character encountered in a binary file transfer will halt the modem Select AT U0 off for binary file transfe...

Страница 44: ...volatile RAM AT W allows a particular configuration to be saved in the non volatile RAM and then reloaded the next time power is applied to the modem or the reset ATZ command is issued The interface s...

Страница 45: ...DTR and send the relevant alarm string on connection Otherwise the modem will wait for an AT command or Answer when the ring limit is reached If the AT command originates the call then the alarm strin...

Страница 46: ...D3 Equivalent to activating both AT D1 and AT D2 AT E Data Compression Parameters 0 or 1 Default 0 Data compression disabled AT E controls the data compression feature of the modem during error corre...

Страница 47: ...E0 AT R Remote Configuration Parameters 0 or 1 Default 0 Disabled This command enables and disables the remote configuration option When remote configuration is enabled a remote user can modify the c...

Страница 48: ...AT COMMAND SET Section 4 4 26 Copyright C Dataplex Pty Ltd THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 49: ...X 213 supports synchronous operation at 1200 bps in both CCITT and Bell Modes and 2400 bps in CCITT V 22bis Mode to disable synchronous clocks short J8 Pin 1 and 2 Before synchronous operation can be...

Страница 50: ...X 213 to dial the number stored in location zero on the rise of DTR If no dialling is desired the user should ensure location zero is empty for the originating modem or have R stored for reverse mode...

Страница 51: ...ings If DTR is low and incoming ring is detected the RING message will be output to the DTE If DTR is raised while the phone is ringing the modem will go on line in Originate Mode provided the S0 coun...

Страница 52: ...requiring a full V 22bis retrain sequence making this mode compatible with other V 22bis modems such as the TEL 424 V 22bis V 22 and V 21 recommendations are supported in Asynchronous Leased Line Mod...

Страница 53: ...e following command string is an example of the use of this facility AT M1 S30 182 N0 Z 1234567 This sets the modem up to dial 1234567 when DTR is raised and then pass eleven bit characters once the c...

Страница 54: ...dem will revert to location 0 For every attempt or pair of attempts if location 1 contains a number the modem checks if the redial count S50 has been reached and gives up if this occurs Alarm detectio...

Страница 55: ...ape sequence pause pause then AT R1 if on line or simply AT R1 if off line Holding down the LOOP button at the instant power is applied will also temporarily enable remote configuration The central si...

Страница 56: ...APPLICATIONS Section 5 5 8 Copyright C Dataplex Pty Ltd THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 57: ...ransmitted over the communications channel which will often have noise electrical interference This noise will corrupt the data and produce errors At the receiving terminal the packet is analysed by t...

Страница 58: ...of characters in the modem are cleared When the buffers fall to 30 full CTS is asserted or the Xon character is sent allowing normal transfer of data to resume Any error free modem link can lose data...

Страница 59: ...r 5 It arrives at buffer 5 faster than buffer 6 can take it since the output speed to the terminal is only 1200 bps Buffer 6 is in danger of an overrun and so issues Xoff to buffer 5 Buffer 5 may now...

Страница 60: ...ort is found the DPX 213 either hangs up or enters the transparent data mode where data is transparently passed with no error correction or compression enabled When a 2400 bps phone line rate connecti...

Страница 61: ...our terminal speed to 1200 bps Some software packages such as Telix can read the CONNECT speed message and automatically adjust the PC com ports while in other packages you must manually reset the PC...

Страница 62: ...but it is a very efficient protocol compared to XMODEM 6 8 Software Compatibility The DPX 213 modem operation is compatible with most popular communication programs that use the AT dialling protocol...

Страница 63: ...rror rate tests are performed with MNP enabled line errors will be corrected but a false bit error rate reading will be given The Constant Speed Interface allows test equipment to run faster or slower...

Страница 64: ...equivalent to typing ATO To enter the Analog Loopback type the command string at t1K In synchronous or asynchronous operation the modem will respond with an asynchronous LOOP GRANTED message All char...

Страница 65: ...f the remote modem is able to support loopback testing or RDL DENIED if the remote modem either cannot support RDLB or has previously issued the AT T5 command The DPX 213 modem which is in RDL mode wi...

Страница 66: ...TESTING and DIAGNOSTICS Section 7 7 4 Copyright C Dataplex Pty Ltd PAGE INTENTIONALLY LEFT BLANK...

Страница 67: ...hanges Changing a bit mapped S Register involves the following steps 1 The binary notation system is used in the following example A simple system for converting 8 bit binary representations into thei...

Страница 68: ...abled and the Constant Speed Interface is disabled you would do the following 1 Display the current setting of the bit register by entering ats30 K 2 In the factory default condition the contents of S...

Страница 69: ...nt Default 0 Range 0 to 255 S1 is a read only register that is incremented every time an incoming ring signal is detected This register is automatically cleared if no ring is received within an 8 seco...

Страница 70: ...in seconds that the DPX 213 will wait before dialling a phone number This delay allows for the delay in dial tone after going off hook S6 will be ignored if ATX3 or ATX4 is enabled If S6 is set to a v...

Страница 71: ...er the escape code sequence before the sequence is recognized It is also the maximum amount of time that the escape code characters can be spaced apart If the escape guard time 0 the feature is disabl...

Страница 72: ...0 AT P1 AT P2 Password security disabled Password security enabled Password with dialback 7 0 1 AT R0 AT R1 Remote configuration disabled Remote configuration enabled S23 Modulation CCITT Bell Parity...

Страница 73: ...9 bit character length 10 bit character length 11 bit character length S31 Flow Control Pass Through Break Handling Sync Async and Remote Loop Disable Default 01 hex Range 0 to 255 Stored in NVRAM BI...

Страница 74: ...divided by 256 Whole Number Only S36 Remainder of above equation For example setting the inactivity timer duration to 1 minute and 30 seconds or 90 seconds would involve setting register S37 to 0 as...

Страница 75: ...d telephone line the unit will wait for a interval of S51mins before raising the line again and attempting to dial If no alternate number is provided then the unit will wait 2 S51 minutes before redia...

Страница 76: ...S REGISTERS Section 8 8 10 Copyright C Dataplex Pty Ltd THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 77: ...ry bit synchronous protocol independent Interface Speeds Asynchronous 300 1200 2400 4800 9600 Synchronous 1200 and 2400 bps Line Speeds Asynchronous 300 1200 2400 bps Synchronous 1200 2400 bps Operati...

Страница 78: ...mm Width 127 8 mm Depth 130 mm Weight 0 6 kg MODELS AVAILABLE DPX 213 01 240VAC Standard Mains Operation DPX 213 02 7 20VDC Standard DC Operation DPX 213 03 20 70VDC Standard DC Operation Standard Ac...

Страница 79: ...shows that any defect was not caused by accident misuse negligence alteration improper installation unauthorised repair or improper testing Dataplex will return the equipment freight prepaid after rep...

Страница 80: ..._____________________________________________ Notes ____________________________________________________________ ____________________________________________________________ __________________________...

Страница 81: ..._________________________ AT CONFIGURATION USED BY MODEM USE AT C and print screen dump TO FIND OUT _________________________________________________________________ __________________________________...

Страница 82: ......

Страница 83: ...f carrier response time 3 S12 Escape code guard time 50 S14 Echo response codes verbose leased line dialling 14 Hex S21 CD control dumb alarm mode password remote configuration 0 S23 Modulation parity...

Страница 84: ...Appendix B S REGISTER SUMMARY Copyright C Dataplex Pty Ltd B 2 THIS PAGE INTENTIONALLY LEFT BLANK...

Страница 85: ...110 38 00100110 54 00110110 70 01000110 86 01010110 102 01100110 118 01110110 06 ACK F 16 SYN V 26 36 6 46 F 56 V 66 f 76 v 7 00000111 23 00010111 39 00100111 55 00110111 71 01000111 87 01010111 103 0...

Страница 86: ...6 B6 C6 D6 E6 F6 135 10000111 151 10010111 167 10100111 183 10110111 199 11000111 215 11010111 231 11100111 247 11110111 87 97 A7 B7 C7 D7 E7 F7 136 10001000 152 10011000 168 10101000 184 10111000 200...

Страница 87: ...cted between the modem and the terminal The wiring for these cables is described in this Section Line and Phone Connector The phone and line connector are both RJ 11 type connectors The Line Connector...

Страница 88: ...Ground 101 Not Used 2 Transmit Data 103 In 1 3 Receive Data 104 Out 1 4 Request to Send 105 In 2 5 Clear to Send 106 Out 2 6 Data Set Ready 107 Out 3 7 Signal Ground 102 Common to Both 1 8 Carrier Det...

Страница 89: ...ifier 4 12 ATQ Result code quiet mode 4 12 ATSr S register inquire 4 12 ATS n S register set command 4 13 ATT Tone dial modifier 4 13 ATV Verbose or terse control 4 13 ATX Response codes blind dialing...

Страница 90: ...2 AT Z Store phone number to NVRAM 4 22 AT A Alarm mode 4 23 AT C Configuration screen 4 23 AT D Dumb mode 4 24 AT E Data compression 4 24 AT G Interrupted calling tone 4 24 AT P Password security 4 2...

Страница 91: ...to 5 3 2 5 4 16 5 1 4 22 4 23 4 25 5 7 8 6 Connecting the modem 2 1 to 2 7 Connectors RS 232 RJ 11 D 1 4 15 D 2 2 1 D 1 Constant speed interface 3 2 4 7 4 10 4 17 6 5 8 72 D Data compression 4 16 to...

Страница 92: ...d hardware 1 1 Resetting the modem 2 5 4 15 5 1 Result codes enabling disabling table text numerical format 4 3 4 13 4 14 8 5 8 7 4 14 4 13 8 5 8 7 Retrain 4 11 Ring answer and count 8 3 RTS CTS flow...

Страница 93: ...D a t a p l e x P t y L t d Incorporated in NSW A C N 003 053 343 Level 2 71 Epping Rd NORTH RYDE NSW 2113 AUSTRALIA DPX 612 02 9869 2500 FAX 612 02 9869 2600 www dataplex com au info dataplex com au...

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