Manuel d'utilisation / d'entretien du produit 56K du fabricant 3Com
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® http://www.3com.c om/ 3Com Of ficeConnect 56K Business Modem Command Refer ence Publishe d Janua ry 1999.
3Com Corporation 3800 Golf Rd . Rolling Me adows, Illi nois 60008 Copyright © 1999, 3Com C orporatio n. All right s reserved. N o part of this doc umentatio n may be reproduced in any form or by any .
C ONTENTS A BOUT T HIS G UID E Introduction ............ ............. ................... ............. ................... ............ 1 Finding S pecific Inform ation in Thi s Guide ............. ............. .................. 2 Convention s ...
Setting up your ISP information ...................... ............. .............. 1 -16 Other Operating System s ............ ...... ....... ...... ...... ....... ...... ....... ....... 1 -17 If Y ou A re Using W indows 3 .x ........................
Call Detection ......... ................... ............. ................... ............. ......... 4-6 Caller ID Functions ........ ....... ...... ....... ............ ....... ...... ....... ...... ....... .. 4-7 Service T ypes ...................
Controlling Link S peeds with &N and &U ............. .................... ......... 8-4 Controlling Link Speeds ......... ...... ....... ............ ....... ...... ....... ...... ... 8-4 Limiting the Highes t Possibl e Conne ct Speed .. ....
Software Flow Con trol .... ................... ................... ............. ....... 1 1-2 Received D ata Flow Con trol ........ ............. ................... ............. ....... 1 1-3 T ransmi t-Data Flow Control ........ ............. ...
Digital Loop back T esting (A T&T3) ........ ................... ............. ....... 1 4-5 Remote Digi tal Loopback T esting (A T&T6, A T&T7) ............... ....... 14-6 Granting a D igital Loopb ack T e st Request (A T&T4) . ......
Getting Ne w Operatin g Software ................. ............. .................... 16-2 Sendin g New Software to your modem ... ................... .................... 16-2 If Y our Mod em Doesn’t Res pond ............. ................... .....
Additiona l Sp ecific ations . ....... ...... ............. ...... ....... ...... ....... ...... ... E-3 Serial Ports ... ...... ....... ...... ....... ...... ....... ............ ....... ...... ....... ...... ... E- 3 The EIA-23 2 Interface .........
A BOUT T HIS G UIDE Introduc tion This guid e is a command r efer ence for t he 3Com Of ficeConnect 56 K Business Mod em. It includ es informat ion about A T commands, S-Regi sters and tro ubleshoot ing.
2 A BOUT T HIS G UIDE Conv entions T able 1 an d T able 2 list conv e n tio ns th at a re used throug ho u t this gu id e . T able 1 Notice Icons Icon Notice Type Description Informatio n note Importa.
Related Do cumentation 3 Relat ed Docum entation The 3C om Off iceC onn ect 56 K Bu siness Mod em I nstal la tion Gui de should be used for the insta ll a tio n of the Bu s in e ss Mo de m . Y ear 2000 Compliance For in formati on on Y ear 2 000 c ompl iance and 3Com products, v isit the 3Com Y ea r 200 0 we b pag e: http:/ /www .
4 A BOUT T HIS G UIDE.
1 C ONNECTING TO Y OUR ISP This c hapter c ontains infor mation about c onfig uring your m odem fo r various opera ting systems. ■ W indows 95/ 98 ■ W indows NT 4.
1-2 C HAPTER 1: C ONNECTING TO Y OUR ISP 3 When the fo llowing wi ndow appear s, i nsert your C onnections CD - ROM, change the de fault driv e in Cop y Manu facturer’ s files from: to D: (or the correct path of your C D-ROM) a nd click OK to insta ll the I NF file.
Windows 95/98 1-3 Step O ne: Determ ine if D ial-Up Ne tworking is In stalled 1 Click Start | Settings | Co ntrol Pan el . 2 On the Con trol Panel, do uble-click on Network . The Network widow will appear . 3 Return to the C ontr ol Panel an d doubl e-click on Add/Re move Programs to open t he Ad d/Remove Pr ograms Pr ope rties window .
1-4 C HAPTER 1: C ONNECTING TO Y OUR ISP 8 Insert your Windows 95/ 98 Set up diske tte or CD-ROM when you are pr ompted, and Windows 95/98 insta lls Di al-Up Net working . Step T wo: Inst alling Dial-Up T CP/IP S uppor t 1 Click Start | Settings | Co ntrol Pan el .
Windows 95/98 1-5 9 On the My Con nection wi ndo w , click Ser v er T ype , and deselect the follow ing: ■ Log on to Net work ■ NetBEUI ■ IPX /SP X Compa tible.
1-6 C HAPTER 1: C ONNECTING TO Y OUR ISP 10 Click OK , and OK . Step Four: Custom izing th e TCP/I P Settin gs Dependi ng on the ISP you use, you may need t o customize the TCP/IP settings.
Windows 95/98 1-7 5 Specif y an IP addr ess, i f needed: 6 After you sp ecify an IP A ddr ess, specify se rver assigned n ame server addr esses, i f needed: If your ISP Do this Gives you a sp ecific I.
1-8 C HAPTER 1: C ONNECTING TO Y OUR ISP 7 Double-cl ick your New Connec tion icon to conn ect! Wind ows NT 4 .0 and Later TCP/I P is t he main pr otocol use d to transfer data via the In ternet. T o use TCP/I P wit h W indows NT , you mu st connec t to your ISP usin g a PPP or SLIP conne ction.
Window s NT 4.0 and Later 1-9 What yo u ne ed Before you begin , ob tain the foll ow ing in for mati on : ■ Does your ISP have a SLIP or PPP account? ■ Y our ISP’ s telephone numb er ■ Does yo.
1-10 C HAPTER 1: C ONNECTING TO Y OUR ISP 8 Click Network. 9 Select the protocols required to dial i n and out w ith yo ur Busi ness Modem. 10 Set Encryption Setting s to A llow a ny auth enticat ion incl uding cl ear text . 11 Click Conti nue to comp le te RAS setup.
Window s NT 4.0 and Later 1-11 7 Sele ct Enable software comp r ession . 8 Specif y an IP addr ess by clicki ng TCP/I P sett i n g s . 9 After you sp ecify an IP A ddr ess, specify se rver assigned n .
1-12 C HAPTER 1: C ONNECTING TO Y OUR ISP T r oubles hoot ing R AS RA S is signi fican tly ea sie r to troublesho ot then W in95 Dia l -Up Network ing, there a r e a finite n umber o f problem s that o ne runs into on a dail y basis, and t he major ity of these ar e c aused by misconfi guration .
Macint osh 1-13 System C onfigura tion Also, if you ar en’ t usi ng A ppleT alk® Remot e A ccess (ARA), set A ppl eT alk to Inac tive (in Chooser). The modem in itiali zat ion stri ng should be AT&F1&D0 .
1-14 C HAPTER 1: C ONNECTING TO Y OUR ISP the script re ceives an OK back fr om the modem and/or t he system r esponds with a pr oper speed . Configu ring O pen T rans port PPP Se lectin g the corr ect modem 1 Go to Ap ple Me nu | Co ntrol Pane ls | Mod em .
Macint osh 1-15 Selectin g the corr ect TCP/IP setting s 1 Go to Ap ple Me nu | Co ntrol Pane l | TCP /IP . 2 In the TCP/IP window , select PPP in the Conn ect via drop d own box.
1-16 C HAPTER 1: C ONNECTING TO Y OUR ISP Setting up you r ISP informa tion 1 Go to Ap ple Me nu | Co ntrol Pane ls | PPP . 2 In the PPP wi ndow , select Register ed Us er . 3 T ype in your In ternet Service pr ovid ers login name an d your passwor d in the name and passwo rd bo xes.
Other Operating S ystem s 1-17 Othe r Opera t ing Systems Thi s se ct io ns e xp la i ns ho w to con f ig ure your mo d em for : ■ W indows 3. x ■ MS-DO S ■ UNIX , Linux, or AIX If Y ou Are Using Wind ows 3.x Windows 3.x comes with a bui lt - in communicat ions softwar e package, Windows T erminal.
1-18 C HAPTER 1: C ONNECTING TO Y OUR ISP.
2 U SING THE AT C OMMAND S ET This chap ter includ es info rmation about ■ Basic A T commands ■ Using S- Registe rs ■ Unders tanding b it-mapped S-Reg isters Overview Y ou can use A T commands to change yo ur modem setti ng s at any time.
2-2 C HAPTER 2: U SING THE AT C OMMAND S ET AT&K3X2DT5551234 Hyphens an d parentheses ad d to the cou nt of 56 charact ers but, spaces do not. Basic A T co mma nds Th e comm and A T informs the modem th at a command is co min g. A T must pr ecede all co mmands excep t A/, A> a nd ++ +.
Using S- Registers 2-3 Disp layi ng S- Regi ster settings Y ou can d ispl ay S-R egist ers i n a va riet y of ways . See the ta ble be low f or more info rmatio n.
2-4 C HAPTER 2: U SING THE AT C OMMAND S ET Getting a list of S-Regis ters In orde r to issue this c omman d, you must be in T erminal Mod e. See Appendi x A, S -Register s for a comp lete list o f S-Re gisters. Understan ding bit-mappe d S-Regist ers A bit-ma pped S-Reg ister uses one num ber to descri be a co llecti on of settings.
3 M ODES OF O PERATION This chapt er contain s informat ion about ■ Command an d Online Mode s ■ Cont rollin g L oca l Ec h o ■ Data and Fax M odes Command and Onl ine Mo de s DO NOT type AT before +++ or <ENTER> after th e command If you want to Set the modem to Use this c ommand Control the modem usin g AT commands.
3-2 C HAPTER 3: M ODES OF O PERATION Enterin g Onli ne Comma nd Mod e Whe n the modem is in Onli ne Mo de, the only c omm and it recognize s is an e scape c ode, or ++ +. Revert t o Command Mode without losi ng connect io ns by sending ATS14.0=0 to the mod em bef or e est ablishi ng your conn ection.
Controllin g Loca l Echo 3-3 Cont rollin g Loc al Echo Ther e ar e two local echo setti ngs, one for Command Mo de and one fo r Onlin e Mo de. Comma nd-Mode Local E cho Y ou can configu r e your mode m to display the commands you typ e on scr een by using t he A TEn command .
3-4 C HAPTER 3: M ODES OF O PERATION Data and Fax Modes Once you ar e in Command Mode, you can initi alize the modem in Da ta or Fax mode. Fax op e rat ions requi re facs im i le - co mpa tib le co mm un ic a ti on s so ftw a re that can se nd or rece ive Grou p III faxes.
Data and F ax Mod es 3-5 If you ar e not sur e whether yo ur modem is in D ata or Fax mode, use the AT+FCLASS? c ommand . Whenever t he modem is r eset using th e A TZ command or by turn ing the power off and then o n, it will re set to Data Mode. If the modem returns a va lue of This ind icates 0 Data Mode 1 Class 1 Fax Mo de 2.
3-6 C HAPTER 3: M ODES OF O PERATION.
4 D IALING , A NSWERING , AND H ANGI NG U P This ch apter exp lains how t o use b asic A T commands fo r: ■ Dialin g ■ Carrier loss redial ■ Answe r in g c alls ■ Makin g In ternational calls .
4-2 C HAPTER 4: D IA LIN G , A NSWERING , AND H ANGING U P Wait for a n answer (w ith X3 or hi gher). Some online servi ces answer the phon e and return a tape-recorded re quest for info rmation before process ing transa ctions.
Carr ier Los s Re dial 4-3 Carrier Los s Re di al Y ou can se t the Bu siness M odem to redial the last-d ialed n umber a fter it loses carrier (carri er is the signal ma intained between two modems wh ile they ar e on li ne) . This fea ture i s useful fo r dialed-l i ne connecti ons that operate un attended.
4-4 C HAPTER 4: D IA LIN G , A NSWERING , AND H ANGING U P Answer ing Ca ll s Y our modem can be configur ed to answer calls. By de faul t, your Busi ness Modem will not automat ically answe rs call s. For ce Answer Mode Auto Answer Y ou can set y our modem to Au to Answe r using the A TS0 command .
Making Inte rna t io na l calls 4-5 Hang ing u p If you want to end a connecti on with a r emote devi ce do the foll owing: 1 Enter Onli ne Command Mo de by typing +++ 2 W ait 1 se co n d 3 Ty p e ATH Making International calls Y ou can use the A TB n , A T&G n a nd A TP n co mmands for makin g analog internati onal calls ab ove 1200 bps.
4-6 C HAPTER 4: D IA LIN G , A NSWERING , AND H ANGING U P Guard tone The A T&G n command only appli es t o analog over sea s calls at 2400 or 1200 b ps. If you set &G2 yo u must also se nd ATB0 t o the modem. Thi s setting allow s the Bus iness Mod em to answe r al l cal ls fr om ove rseas .
Caller I D Functions 4-7 Caller ID Fu nctio ns Caller ID is a se rvice p rovided b y loca l tele phone compa nies. When y ou subscrib e to caller I D, your phone compa ny begins pr ovid ing you real-time inform ation about incom ing c alls.
4-8 C HAPTER 4: D IA LIN G , A NSWERING , AND H ANGING U P How the Busine ss Mode m H andle s Caller I D When th e mod em receive s the ca ller ID s igna l, it stores the info rmatio n in memory . Y ou c an acce ss t he inf orm atio n at a ny time by sendi ng ATI1 5 to the mod e m.
Caller I D Functions 4-9 Pr esentation Fo rmats The Bus in ess M od e m s e nd s the ca lle r ID in fo rm ati o n to yo ur com pu t e r formatt ed or u nforma tted. Formatted presentati on is a transla tion o f the caller ID signal i nto ASCII text. Un formatted presentati on is a hexadecim al r epr esentation of the caller ID signal.
4-10 C HAPTER 4: D IALI NG , A NSWERING , AND H ANGING U P Refer ences For more info rmation about Ca lling Number D elivery (CND ), refer to Bellcor e documents TR- TSY -000030 and TR-T SY -000031.
Distinct ive R ing Supp ort 4-11 Ther e ar e four ring pa tterns in common use: These ar e graph ical de pi ctions of each ring pa ttern. Comma nds Exam ple: Send ing ATS70.0=1.3=1 to yo ur modem enables t he recogniti on of ring ty pes A and D only .
4-12 C HAPTER 4: D IALI NG , A NSWERING , AND H ANGING U P When a call come s in with a ring typ e A or D, the Business M odem wi ll send the result co de RING A or RING D, r especti vely .
5 W ORKING WITH M EMORY This chapt er contain s informat ion about: ■ Saving a pho ne number to N VRAM ■ Wo rking with Flash Me mory Y ou can upgrad e the softwar e hel d in Flas h memory by perf orming a software d ownload. Se e Chapt er 3 , Upgr adi ng your Sof tware, for mor e informat ion abo ut perfo rming a software downl oads.
5-2 C HAPTER 5: W ORKING WITH M EMOR Y Exampl e: Send ing ATI5 will displ ay NVRAM settin gs on your scr een. T o see a co mple te list ing of the pe rman ent setti ngs s tored in Fl ash memory see Appendix C , Flow Con trol T em plates. Working with RAM and NVRA M Y ou can change a ny setting just for the cu rrent session.
Working with Flash Memory 5-3 If the call requ ires a sp ecial setting , ins ert it in the comma nd be fore the DSn comman d. In thi s example, &M0 (no er ro r co ntro l) comes be f ore DS2. T ype : AT&M0DS2 The A T&Zn=s command f unc tions diff erently whe n Dial Secur ity is enabled .
5-4 C HAPTER 5: W ORKING WITH M EMOR Y All of the s etting s in each template are given in A ppendix C, Flow Contr ol T emplate s . For more informatio n abo ut ha rdware and software flow control, See Chapter 12 , F l ow Co nt rol .
6 C ONTR OLLING R ESULT C ODE D ISPLAYS This chapt er contain s informat ion about: ■ Resu lt Code Displa y co mmand s ■ Additi onal Result Code subsets Result Co de Display Commands The comma nds listed bel ow contr ol whether r esult codes ar e displa yed, and in what fo r mat they ar e displa yed .
6-2 C HAPTER 6: C ON TRO LLING R ESULT C ODE D ISPLAYS Additio nal Re su lt Code Subsets ARQ ( Autom atic Repeat Req uest) is used in t his ma nual t o den ote ca lls that use error con tro l. . The numer ic identif i ers for &A3 re sult codes are t he same as those used for &A2.
7 C ONTR OLLING EIA-232 S IGNALIN G This c hapter c ontains infor mation about c onfig uring the EI A-232 1 signall ing bet ween you r compu ter and modem: ■ Data T ermina l Ready ■ Data Set Re ad.
7-2 C HAPTER 7: C ON TRO LLING EIA-232 S IGNALING Data Se t Ready Under nor mal conditi ons, the Bu siness Modem sends a D ata Set Ready (DSR) sign al to your comp uter when it is read y to send and r eceive dat a. CAUTION: Do not change the def ault setti ng of &S0 unle ss you know that your install ation requ ires a diff erent setti ng.
Carrier Detect 7-3 Carrier Dete ct Carrie r means ther e is communi cation wit h the device on th e ot her end of th e conn ection . Unde r norm al co nditio ns, th e Bus iness Mode m sen ds a Carrier D etect (CD) signal in r esponse to e stablish ing a conne ction with anothe r modem.
7-4 C HAPTER 7: C ON TRO LLING EIA-232 S IGNALING.
8 C ONTR OLLING D ATA R ATES This chapt er contain s informat ion about ■ Serial po rt rates ■ Connec tion rate s ■ Cont r olling L ink Spe eds with &N and & U ■ Settin g DTE Ra te to 2 30 Kb ps Overview Y ou can set the B usiness M odem to u se fixed or va riable seria l port rates and fixed or variable connec tion rate s.
8-2 C HAPTER 8: C ON TRO LLING D ATA R ATES Y our s oftware may u se terms su ch as locked serial p ort (fixed rate ) or autoba ud (vari able rat e). The seria l port r ate MUST b e equal to or high er than t he Conne ction ra te (&Nn).
Connection Rates 8- 3 Connec tion Ra tes Y o u can set the Busine ss Modem to a fixed or vari able connectio n rate for data calls. Set a varia ble rate to have the Busi ness Modem nego tiate with the remote device for the h ighest possibl e connection ra te.
8-4 C HAPTER 8: C ON TRO LLING D ATA R ATES Controllin g Li nk Speeds with &N and &U Y ou can use the & N and &U commands t o contr ol link spe eds. Cont rollin g Li nk Speeds U se the fol lowing ta ble to det e r mine how to use &N and &U co mmands: The defau lt values for & N and &U are 0.
Controlling Link Speed s with &N and &U 8-5 Limiting the Lo west Poss ib le Co nn ect Speed The &U comma nd allows you t o li mit the lowe st possible connect speed. If a r emote mo dem attemp ts to co nnect t o your Busine ss Modem a t a speed lower th an &U, your Bu sines s Mode m will not al low i t to conn ect.
8-6 C HAPTER 8: C ON TRO LLING D ATA R ATES &N and &U Co mmand V alues Use the fol l owing tabl e for a compl ete list of &N and &U li nk sp eeds and their associated i ndexes: Link Sp.
Setting DT E Rate to 230 Kbps 8-7 Setting DTE Ra te to 230 Kbps The DTE ra te of yo ur Bu sin ess Modem h as be en i nc r ease d to 2 30 kbp s t o enhanc e t hr oughput . This command is only suppor ted on Business Mo dems attached t o high speed serial cards.
8-8 C HAPTER 8: C ON TRO LLING D ATA R ATES.
9 A CCESSING AND C ONFIGURI NG THE B USINESS M ODEM R EMOTELY This chapt er contain s informat ion about: ■ Settin g up remo te ac cess ■ Accessing the h ost ■ Quitting a remo te access session Overview Y ou can set up the Busine ss Modem so other devices can view or change its conf ig u ra tio n remotely .
9-2 C HAPTER 9: A CCESSING AND C O NFIGU RING THE B USINESS M ODEM R EMOTELY 2 Enable r emote acce ss. Set R egist er S 41 for a val ue of 1 or gr e at er . S41 sets th e numb er of log -in attempts ava il abl e to the remot e user . A setti ng of zero allows no log -in attempts di sablin g remote access.
Accessing the Host 9-3 Other Remote-Access Comma nds The table below is a l ist of remo te-access confi guration comman ds. Exampl e: Send ing AT%P1= will erase th e view and change pa ssword .
9-4 C HAPTER 9: A CCESSING AND C O NFIGU RING THE B USINESS M ODEM R EMOTELY 4 Y o u should see a di splay similar to this: 3Com OfficeConnect 56 K Business Modem Remote Access Session Serial Number 000000A 000000001 Password (Ctrl-C to c ancel)? Ther e i s a 3-mi nute time l imit for enteri ng t he passwor d.
Accessing the Host 9-5 Dependi ng on your ac cess pr ivilege s, you can use the r egular set of Business Mod em A T commands. CAUTION: Be carefu l not to send ATZ or ATZ! or you will lo se the connect ion! Remote Conf iguration Comma nds Ther e ar e special com mands that can be used only dur ing a r emote-access session.
9-6 C HAPTER 9: A CCESSING AND C O NFIGU RING THE B USINESS M ODEM R EMOTELY Y ou can use the A T%Fn command to con trol the data format . Y ou can use the A T %C n command to contr ol whether and whe.
Quitting a Remote-Access Se ssion 9- 7 If yo u r est or e the ori ginal co nfigurat i on using the A T%C1 command, the fir st pr ompt is r estor ed, assuri ng you the or i ginal c onfigura tion is in tact .
9-8 C HAPTER 9: A CCESSING AND C O NFIGU RING THE B USINESS M ODEM R EMOTELY.
10 D IAL S ECURITY This chapt er contain s informat ion about: ■ Settin g up D ial Se curity ■ Main ta inin g securit y accounts ■ What the gu est user needs to do ■ Config uring di al security remote ly Overview Dial Secu rity is desi gned to protec t netwo rks a nd da ta cente rs from unauthor ized access.
10-2 C HAPTER 10 : D IAL S ECURI TY Setting up Dial Security Here is a summar y of the step s fo r setting up Di al Securi ty : ■ Set up a n account for yoursel f. ■ Identify your account as the Adm i nistra tive Accou nt. ■ Set up g uest-user accounts.
Setting up Dial Security 10-3 Dialba c k op tio ns Y ou can set the Busi ness Modem to auto mat ically di alback a c er tain number after a clien t modem dials in . Count y our commas! There sho ul d always be four com mas in the %A command. Do not inser t spaces betwee n commas or between fields and commas.
10-4 C HAPTER 10 : D IAL S ECURI TY will b e locked out o f the B usiness Modem’ s dial securit y featur es. Y ou will need to restor e the factory defaults. Thi s will erase ALL passwords and you will ha ve to reconfigure all your accoun ts. 3 Set up g uest-user accounts.
Setting up Dial Security 10-5 Autopas s Prompting Autopass is the defau lt form o f password protecti on. Autop ass automate s the pr ocess of log gi ng in to th e host modem, but it re quir e s the guest and host devices to be Busi ness Modems.
10-6 C HAPTER 10 : D IAL S ECURI TY 6 Enable D ial Securit y . WARNING: Befor e you enabl e Dial Secur ity , you must set up an administ rative acc ount and passwo rd. See Steps 1 & 2. Exampl e: Issuin g AT%A3=corn,y,y,y,5551234 to yo ur mod em will enable Passwo rd Pr ompting and Dialb ack for account 3, which has the passw ord corn .
Maintain ing Security Accounts 10-7 Maintainin g Security Acco unts Once the administra ti ve password is set and Dial Securit y is enabled, th e administ rator i s the only one who can access account in formati on. Y ou can use the A T% S= and A T%E= commands to chan ge and modif y accoun t info rmatio n.
10-8 C HAPTER 10 : D IAL S ECURI TY What th e Guest User Needs to Do When guest user s want to ca ll i n to the host (assumi ng you have enabl ed Dial Securi ty by enteri ng ATS53.0=1 ), ■ They must kn ow the passwor d. ■ If you have enabled Dialb ack, they must set their devi ce to auto-ans wer .
Configurin g Dial Securi ty Remotely 10-9 3 If Dialback is enabl ed at the host Business Mo dem’ s site, set your modem to answer th e host Busine ss Modem when it dial s back.
10-10 C HAPTER 10 : D IAL S ECURI TY WARNING: If you do not use the A TZ command t o end a r emote -access session, Dial Security will r emain d isabled at the h ost, and anyone diali ng in to the host for re mote access will have access to the A TI10 screen and all Dial Securi ty accounts.
11 F LOW C ONTR OL This chapt er contain s informat ion about ■ Hardwar e and software flow con trol ■ Received -data f low cont rol ■ T ransmi t-data f low contr ol Overview The Business M odem has two bu ffers, one for data tra nsmitted fr om your compute r , and one for data rece ived fr om the phone line.
11-2 C HAPTER 11 : F LOW C ONTROL Hardwar e and Software Flow Control Ther e ar e two kinds of f low contr ol: ha rdwar e and software. Business Modems su pport both, bu t your compu ter and communi cations soft ware must also sup por t the kind of flow contr ol you cho ose.
Received Data Flow C ontrol 11-3 Received Data Flow Control Flow contr o l sett ings ar e contr oll ed by the A T&Rn and A T&In comma nds. The de fault setti ngs are &R2& I0. Use the fol lowing ta ble for m ore inform at ion ab o ut set ting th e flo w contro l.
11-4 C HAPTER 11 : F LOW C ONTROL Exampl e: Send ing AT&I2 will r e move XON/ XOFF commands fr om the data str eam instead of sending them to the r emote comp ut er . This will for ce the Busin ess Modem to act of the XON/XOFF comma nds. Enable He wlett Packard-T erminal mode.
Tran smit- Data F low C ontrol 11-5 T ransmit-Data Flow Control This type of flo w cont r ol is fo r data transmitte d to the Business Modem by it s attached comput er . For your mo dem to Command Disable t ransmit data flow control AT&H0 Enable Hardware flow control.
11-6 C HAPTER 11 : F LOW C ONTROL.
12 H ANDSHAK ING , E RR OR C ONTR OL , D ATA C OMPR ESSION , AN D T HR OUGHPUT This chapt er contain s informat ion about: ■ Handshaking ■ Sele ctive Reje ct ■ V .
12-2 C HAPTER 12 : H ANDSHAKING , E RROR C ONTROL , D ATA C OMPRESSION , AND T HROUGHPUT Select i v e Re j ect is an opt io na l pa rt of th e IT U-T V .42 (L AP M) sta n da rd. Attaining Speeds Above 28.8 Kbp s V .34 connect io ns at 21.6, 24, and 26.
V.90 Capa bilities 12-3 If you en abl e the V .8 call indi cate tone , exp ect to hea r a sou nd like a fa st ringi ng signal whi l e the call is be ing connected .
12-4 C HAPTER 12 : H ANDSHAKING , E RROR C ONTROL , D ATA C OMPRESSION , AND T HROUGHPUT If the r emot e devi ce has V .FC capabil ity , the Bu siness Modem uses a li ne pr obin g techni que to dete rmine the high est spee d possible under curr ent line co nd i tio ns, the n co m p le te s the con n ec ti on .
Error Contro l 12-5 Lower -speed V . Pr otocol s Older , lower -speed "V ." pr otocols do not employ lin e probi ng. Inst ead they use pr edef ined answer to nes to specify or i dentify spee d capabilitie s. These pr otoco ls de fine the fo llowing maximum speeds: ■ V .
12-6 C HAPTER 12 : H ANDSHAKING , E RROR C ONTROL , D ATA C OMPRESSION , AND T HROUGHPUT . Exampl e: Sendi ng AT&M4 allows your mod em to operate in Nor mal Mode is an AR Q conne ction can’ t be made. Err or con tr ol is availabl e for call s at 1200 bps and above.
Error Contro l 12-7 V .42 Err or Co nt r ol The Busin ess Mode m first tri es for a V . 42 conne ction, th en an MNP connect ion. Th e foll owing i nformat ion is based on the Business Modem's setting of &M4.
12-8 C HAPTER 12 : H ANDSHAKING , E RROR C ONTROL , D ATA C OMPRESSION , AND T HROUGHPUT Data Comp ression Busi ness M odem s emp loy di f ferent data c ompress ion tech nique s du ring data conn ections. Exampl e: Send ing AT&K3 is used to transfer com p ressed files .
Getting M aximum Throughp ut 12-9 Possible dictiona ry sizes: Y our modem uses an 11-bi t, or 20 48 -entr y diction ary , but they can r educe it s size t o accommo date a r emote modem that use s a 9 - or 10-bit di c tio n ary . ■ Maximum string length o f each entry .
12-10 C HAPTER 12 : H ANDSHAKING , E RROR C ONTROL , D ATA C OMPRESSION , AND T HROUGHPUT Installa tions with spec ial ized softwar e may want to enable a fixed serial po rt rate for ARQ calls a nd a variable serial po rt rate for non-ARQ cal ls. See the &B2 command in Append ix B, Alph abetic Command Su mmary .
Getting M aximum Throughp ut 12 -11 Overhead is mini mal wit h ZMODEM, re sulting in thr oughput that is almost equal to that obtain ed with no fil e-transfer protoco l. ZMODEM should al so be used for non-ARQ connecti ons. Leav e t he Business Modem at i ts &M4 and &K1 settin gs for both err or contr ol and data compr ession.
12-12 C HAPTER 12 : H ANDSHAKING , E RROR C ONTROL , D ATA C OMPRESSION , AND T HROUGHPUT.
13 D ISPLAYING Q UERYING AND H ELP S CR EENS This chapt er contain s informat ion about: ■ Querying ■ Displ aying h elp T o vi ew sc reen ca pture s of the help scree ns in the fo llowing cha pter , s ee Append ix B, Alph abetic Co mmand Summa ry .
13-2 C HAPTER 13 : D ISPLAYING Q UERYING AND H ELP S CREENS Perform a test of the modem’s random-access memory (RA M) an d di s pla y eith er OK (0 ) or ER ROR (4), follo wed by OK w hen the test is comp leted. You ma y want to use this comma nd if the B usines s Modem appear s to be ma lfunctio ning.
Displaying Help 13-3 Displaying Help The Busine ss Modem pr ov ides six hel p, or comma nd summ ary , screens: basic A T command set, ampe rsand (&) comma nd set, per cent ( %) command set , pe rce nt (%) command set, dial comman d option s (D ), S-Regi st ers (S), and t he octothorp e (#) command set.
13-4 C HAPTER 13 : D ISPLAYING Q UERYING AND H ELP S CREENS.
14 T ESTING THE C ONNECTION This chapt er contain s informat ion about: ■ T e sting the Bu siness Mode m usin g A T&T n ■ T e s tin g th e Bu sine s s Mo de m us in g S- Re g is te r 16 Overview Y our modem can pe r form di gi tal an d remo te digi tal loop back tests.
14-2 C HAPTER 14 : T ESTING THE C ONNECTION T esting the Bu siness Modem us in g AT & T n T o perfor m digita l loopback an d re mote digi tal loop back testi ng use th e AT & T n command. Y ou can type in your own dat a during test ing or use the mod em's inte rna l test pa ttern a nd er r or detector .
Testi ng the Bu siness Mod em usi ng AT&Tn 14-3 Analog Loopb ack T e sting Local loopba ck testin g checks the ope ration of the Business Mo dem transmitte r and receiver . Using A T&T1 1 Send AT&M0&N 3S14.0=0 to pr e par e the modem f or testing.
14-4 C HAPTER 14 : T ESTING THE C ONNECTION If you use the S18 test ti mer , but in th e process of testi ng you issue an A TZ command, S18 reset s to zero and t he timer is di sabled. Y ou cannot store a value for S18 in NVRAM; its power -on and reset defau lt is always zero.
Testi ng the Bu siness Mod em usi ng AT&Tn 14-5 Dig ital Lo opbac k T es ting (A T&T3 ) This test can help you lo cate a pr oblem with a r emote device or with the teleph one l ine. T he fig ure below show s the data fl ow d uring D igital Loopback ( DL) testin g.
14-6 C HAPTER 14 : T ESTING THE C ONNECTION Remote Digital Loopba ck T esting (A T&T6, A T&T7) The r emote digi tal l oop back test, ver ifies the co ndition of both devices and of the ph one line. Data flow is shown in t he figur e below . Data Flow Du ring Remo te Digital Loopb ack.
Testi ng the Bu siness Mod em usi ng AT&Tn 14-7 T estin g Us ing Keyboard Data (A T&T6) 1 Send A T&M0&N3S14.0=0 to prepare the Bu siness M odem fo r testing.
14-8 C HAPTER 14 : T ESTING THE C ONNECTION T estin g Using a Built-in T e st Patter n (A T&T7) This test opt ion causes the mod em to perfo rm a remot e digital loopback test by se nding a built-in test patte rn.
Testing the Business M odem using S-Resister 16 14-9 T estin g the Bu siness Modem us in g S-Resister 16 Regis te r S1 6 is a bi t-m a pp ed regist e r (S ee App e nd ix A, S- Reg iste rs , for instructio ns for setti ng bit-ma pped regist ers).
14-10 C HAPTER 14 : T ESTING THE C ONNECTION T estin g Us ing Keyboard Data (A TS16=8) 1 Send AT&M0&N 3S14.0=0 to pr e par e the Busine ss Modem for test ing. This command disables er r or con t rol , fixes the conne ction ra t e at 2400 bps, and mak es the Business Modem r etur n to comman d mode when you type t he escape code ( +++ ).
Testing the Business M odem using S-Resister 16 14-11 T estin g Using a Built-in T e st Patter n (A TS16=4) The test pat tern is availabl e at all speed s. A t 300 bps, the Bu siness Modem' s serial port rate must be fixed (&B1 ) and the link rate fixed at 300 bps (&N1) .
14-12 C HAPTER 14 : T ESTING THE C ONNECTION.
15 T R OUBLESHOOTING This chapt er explains ho w to tr oubleshoot t he Business Mod em. This chapter is divid e d into the s e sectio n s: ■ Pr oblems t hat o ccur befo re connect ing. ■ Problems that occur after connectin g. ■ What to do i f you still ha ve pro bl ems.
15-2 C HAPTER 15 : T ROUBLESHOOTING ■ Make sur e that verbal result cod es (status messages) are enab led. Send the se commands to t he Bu siness Modem: ■ Review y our comm unicati ons softwar e manual to see what Carri er Detect ( CD) operati ons yo ur softwar e r equir es.
Proble ms Tha t Occur Befor e Connec ting 15-3 Double characters ar e appeari ng on your monito r This is a signa l that bo t h the Busine ss Modem's local e c ho and your softwar e's loc al echo ar e on.
15-4 C HAPTER 15 : T ROUBLESHOOTING Problems tha t Occur Afte r Connec ting Y our screen dis plays ran dom or "g arbage" cha racters Make sure that t he Busin ess Modem is set to th e same bit rate, word length , pari ty , an d num ber of Stop bits as the device to wh ich yo u are connect ing.
Proble ms that Occur After C onnecting 15-5 Mainfram e co mputer k eeps dropping your co nnecti on Y ou must turn of f the B usiness Modem's r esult code s and character ech o (A TQ1E0). The modem at t he mainframe also needs to be set to A TQ1E0.
15-6 C HAPTER 15 : T ROUBLESHOOTING ■ If you ar e atte mpting to mak e a connecti on using HST modul ation, make sure that t he mode m at t he ot her end of th e line is HST compati ble, V .32 terb o compatib le at 14.4 Kbps, V .32 compat ible at 9600 bp s , V .
Proble ms that Occur After C onnecting 15-7 5 If you do r eturn the Busine ss Modem to us, pl ease follo w these pr ocedur es: a Ship th e unit, posta ge pre-pai d, in its o rigina l conta iner .
15-8 C HAPTER 15 : T ROUBLESHOOTING.
16 U PGRADI NG Y OUR M OD EM This chapt er contain s informat ion about: ■ Checkin g your mo dem’ s softwar e versi on ■ Getting ne w operating sof twar e ■ Sending new software to the modem .
16-2 C HAPTER 16 : U PGRADING Y OUR M ODEM Check t he Su pervis or and Digital S igna l Processo r (DSP) dates f ound i n the la st two line s of the screen d ispla y . Thes e da tes wi ll dete rmine which version of th e soft ware your mode m is using.
Sending New Softw are to y our modem 16-3 2 Enter AT~X! . The modem shou ld respo nd as follow s: at~x! SDL Xmodem file transfer - (Y)es (N)o (T)est > 3 Ty p e t <ENTER> to start an integri ty test of the XMD file .
16-4 C HAPTER 16 : U PGRADING Y OUR M ODEM If Y o ur M ode m Does n’ t Respon d If your modem doe sn’ t r espond af ter the flash p roce ss, its memory may be corrup ted. Fol lo w the se steps to force the new softw are to the modem. 1 Power your mod em of f.
A S-R EGISTERS Understan ding Bit-Mapp ed S-Regist ers A bit-ma pped S-Reg ister uses one num ber to descri be a co llecti on of settings. Bit-mapp ing allows us t o pac k a lot of in f ormation i n a small space. Bit-map ped r e giste rs ar e in the f orm of Sr .
A-2 A PPENDIX A: S-R EGISTERS Conv erting Bi ts to Dec im al V alu e s Sta rting wit h a string of eight bits, assign each "1" bi t a value base d on its p osition.
Using Bits A-3 Using Bi ts T ur nin g in dividua l bits on a nd off is the more di rect way to set bit-map ped S-R egisters. T o do th is, speci fy the S-Regi ster tha t you want to set an d then in dicate which bi ts you want to tur n on (1 ) or off (0).
A-4 A PPENDIX A: S-R EGISTERS * Bit-m appe d registe rs hav e up t o eigh t fun ctions . S21 Break length, 10 ms 10 S22 XON character 17 S23 XOFF character 19 S24 Pulsed DSR durati on, 20 ms 150 S25 DTR recogniti on time, 10 ms 5 S26 RTS/ CTS de lay tim e, 10 ms 1 S27 Bit-mapped functio ns* 0 S28 V.
A complete list of S- Registers A-5 A complete li st of S-Regist ers . Register Default F unction S0 0 Sets the num ber of ring s on which to a nswer in Auto Answer m ode. S0=0 disa bles Auto Answe r. S0=1 enabl es Auto Answer and the Business Modem answers on the fir st ring.
A-6 A PPENDIX A: S-R EGISTERS S13 0 Bit -mapp ed r egis ter . See t he be ginn ing o f th is ap pend ix fo r informa tion about setting bit-mapped re gisters. Bit Value Re sult 01 Reset when DTR drops . 12 Reverse normal A uto Answer operatio n: On incom ing RING, en ter Origin ate Mode and look for an answer tone.
A complete list of S- Registers A-7 4 16 Disabl e MNP Leve l 4; retr ansmitti ng the larg er Leve l 4 data blocks m ay be a pr ob lem if you expe ct a gr eat number of e rrors during a call.
A-8 A PPENDIX A: S-R EGISTERS S19 0 Sets the duration, i n minutes, for th e Inactivity Timer. The timer activate s when there is no data activity on th e R232 interfac e, and at the timeou t the Busine ss Modem hangs up.
A complete list of S- Registers A-9 Error control handshak ing options: Sele ct the tota l valu e of bit s 4 and 5 Bit 4 Bit 5 Result 00 Complete handsha king sequ ence: V.42 Dete ction, LAPM error co ntrol, MNP. 16 0 Disa ble M NP. 0 32 Disable V .42 Dete ction and L APM.
A-10 A PPENDIX A: S -R EGISTERS 4 16 Change MR t o DSR 6 64 Disable the remote-access busy message . 7 128 Disable V .32 terbo. S38 0 Sets the durati on, i n seconds, be fore a forc e d ha ng- up a nd clearing of th e Transmit buffer wh en DTR drops durin g an ARQ call.
A complete list of S- Registers A-11 01 Dial security enabled. 12 Promptin g enabl ed. 24 Local- acces s passwo rd prot ecti on enabl ed. Enabli ng local-a ccess pa ssword protec tion disa bles the &a.
A-12 A PPENDIX A: S -R EGISTERS 24 Disabl e preem phasis. 38 Disabl e precod ing. 4 16 Disa ble sh aping . 5 32 Disabl e V.34+ 6 64 Disabl e V.34. 7 128 Disable V.FC. S58 0 Bit -mapp ed r egis ter . See t he be ginn ing o f th is ap pend ix fo r informa tion about setting bit-mapped re gisters.
B A LPHABETIC C OMMAND S UMMARY This appen dix contai ns an alphabe tic listi ng of the A T commands to which the modem wil l respond. Defau lt setting s are bold . Basic Co mman d Set Command F unction $ Display he lp for the Basic comm and set. +++ Esca pe code .
B-2 A PPENDIX B: A LPHABETIC C OMMAND S UMMARY With the exception of the Dial optio ns, modems igno re any commands issued af ter D in the same command string. Bn Set h ands hakin g op tions . B1 Bell answer tone. This setti ng se lects HST modul ation , but use it o nly if the mo dem is not required to answer V.
Basic Command Set B-3 If doub le characters ap pear on th e sc reen, both the modem's l ocal echo and yo ur s of twar e' s loc a l ec h o ar e on. . ! Flash th e switchh ook (off hook 0.5 secon ds, on hook 0.5 secon ds, then off hook). Us e ! when o ther mo dems s hare t he line .
B-4 A PPENDIX B: A LPHABETIC C OMMAND S UMMARY See Appendi x A, S-Regist ers for a listin g of all the S-R egis te r s. Kn Co ntrol the mode m clock. ATI6 displays the ti me. K0 If onl ine , di s pla y cu rrent c all du rati on. I f offl ine, disp l ay last ca ll’s durati on.
Ampersan d (&) Command Set B- 5 Ampersand (&) Command Set The serial port rate M UST be eq ual to or h igher than t he &Nn ra te. . X3 Ignore Di al To ne X4 Microsoft de faul t X7 Busine ss Mode m defaul t Z Software reset.
B-6 A PPENDIX B: A LPHABETIC C OMMAND S UMMARY &C1 Normal operation s. The modem sends a CD signal when i t co nnects wi th a noth er m od em an d dr ops the CD when it d isconnects. &Dn Control how the mode m re sponds to Data Termina l Ready (DTR) signals.
Ampersan d (&) Command Set B- 7 &H1 Use hardware fl ow control. Requires that your computer and softwar e support Clear to S end (CTS) at the EIA-232 interface. &H2 Use software flow contro l. Requires that your software support XON/ XOFF si gnaling.
B-8 A PPENDIX B: A LPHABETIC C OMMAND S UMMARY &K3 Select ive data compre ssion. Th e modem negotia tes only fo r V.42bis c ompression, and disa bles MNP Leve l 5 (MN P5) co mpres s ion. Use this setting to transfer compressed files. &Ln Line t ype.
Ampersan d (&) Command Set B- 9 n=13 26400 bps n=14 28800 bps n=15 31200 bps n=16 33600 bps n=17 28000 bps n=18 29333 bps n=19 30666 bps n=20 32000 bps n=21 33333 bps n=22 34666 bps n=23 36000 bps.
B-10 A PPENDIX B: A LPHABETIC C OMMAND S UMMARY &R2 Enable hardwa re flow control of re ceived data. The mo dem se nds data to the com puter only upon receipt of the RTS signa l. &Sn Sen d the com puter a Data Set Re ady (DS R) signa l via th e EIA-232 inte rface.
Percen t (%) Comma nd Set B-11 If the ca ll is und er MNP5 data co mpression, d estructive br eaks cause bot h modems to reset the ir data comp ression ta bles. When transmissio n resumes, th e modems build new ta bles, and t he r esult is lower -than- normal thro ughpu t.
B-12 A PPENDIX B: A LPHABETIC C OMMAND S UMMARY We recomme nd agai nst forc in g configu ratio n changes unle ss it is absolut el y necessary . An unrel iable conn ection, or loss of connec tion, may result. %An Create and configure security accounts.
Octothorpe (#) Command Set B-13 Octotho rpe (#) Command Set %Fn Remot ely co nfigur e anot her d evice ’s dat a form at. %F0 No parity, 8 data bits. %F1 Mark parity, 7 data bits. %F2 Odd parity, 7 data bits. %F3 Even pari ty, 7 data bits. %L= Set a lo cal-a ccess pa sswor d.
B-14 A PPENDIX B: A LPHABETIC C OMMAND S UMMARY.
C F LOW C ONTR OL T EMPLATE Hard ware Fl ow Control The table bel ow li sts the Har dwar e flow c ont r ol template . T o load this templa te send AT&F1 to your modem.
C-2 A PPENDIX C: F LO W C ONTROL T EMPLATE * Detect ed by e ach modem fr om the A T prefix of th e &W command that writes you r defaults to NVRAM . Set your so ftware to the desired word length, p arity , an d serial po rt rate defau lts before sending th e modem the A T .
Software Flow control C-3 Software Flow cont r ol The table below li sts the Softwar e flow contro l template. T o load this templa te send AT&F2 to the modem.
C-4 A PPENDIX C: F LO W C ONTROL T EMPLATE * Detect ed by e ach modem fr om the A T prefix of th e &W command that writes you r defaults to NVRAM . Set your so ftware to the desired word length, p arity , an d serial po rt rate defau lts before sending th e modem the A T .
No Flow Contro l C-5 * Detect ed by e ach modem fr om the A T prefix of th e &W command that writes you r defaults to NVRAM . Set your so ftware to the desired word length, p arity , an d serial po rt rate defau lts before sending th e modem the A T .
C-6 A PPENDIX C: F LO W C ONTROL T EMPLATE.
D R ESULT C ODE M EANINGS AND S ETS Resul t Code Meanings Result Code Mean ing 0/OK Com mand ha s been exe cuted . 1/CONNECT Connectio n with another device. 2/RI NG Inco ming r in g det ected. 3/NO CARRIER Carrier Detect h as failed, or carrie r has been dropp ed due to dis connect.
D-2 A PPENDIX D: R ESULT C ODE M EANINGS AND S ETS Resu lt C odes Set s for X n Va l u e s Res ult C o des X0 X1 X2 X3 X4 X5 X6 X7 0/OK ❷❷❷❷❷❷❷❷ 1/CONNECT ❷❷❷❷❷❷❷❷ 2/R .
E T ECHNICAL I NFORMATION T ech nical Specificatio ns Y our modem uses multi ple standa rd da ta communi cations pr otoco ls and is a lso compa tible wit h many nonstandar d sc hemes. The fo llowing schemes ar e suppor t ed: Modula tion This mo dulation Supports V.
E-2 A PPENDIX E: T ECHNICAL I NFORMATION Error Control, Data Compress io n, T esti ng, and Di aling Fax Y our Business Modem pr ovid es Grou p III - com pati bility when contr oll ed by Class 1 or Cl ass 2.0 fax soft ware. In additio n, your Busin ess Modem adhe res to the fo llow ing s tandards: ITU-T V.
Techni cal S pecif ica tion s E-3 Addition al Spec ificatio ns Serial Ports Most computers provide a DB-25 or DB- 9 port t hat con form s to th e EIA-232 standar d. If you ar e connecting your Busi ness Modem to a Macint osh computer , see the section For Macint osh Computers.
E-4 A PPENDIX E: T ECHNICAL I NFORMATION The EIA-232 Interface Y our mod em’ s serial p ort is factory set to sign al according to the EIA-232 standar d .
Techni cal S pecif ica tion s E-5 Flo w Contr ol Requiremen ts If your computer an d softwar e support Cl ear to S end and you wish to use T ransmi t Data har dwar e flow cont r ol (&H1), P in 5 (DB -2 5) or Pi n 8 (DB-9) is required.
E-6 A PPENDIX E: T ECHNICAL I NFORMATION Serial Ports (Ma cinto sh mode m ) These are th e sig nals gener ated or accept ed by your mod em’ s serial port:.
F ASCII C HART Dec Hex Cha r Dec Hex Cha r Dec Hex Cha r Dec Hex Cha r 00 00 NUL 32 20 SP 64 40 @ 96 60 ` 01 01 SOH 33 21 ! 65 41 A 97 61 a 02 02 STX 34 22 "66 42 B 98 62 b 03 03 ETX 35 23 # 67 4.
F-2 A PPENDIX F: ASCII C HART 24 18 CAN 56 38 8 88 58 X 120 78 x 25 19 EM 57 39 9 89 59 Y 121 79 y 26 1A SUB 58 3A : 90 5A Z 122 7A z 27 1B ESC 59 3B ; 91 5B [ 123 7B { 28 1C FS 60 3C < 92 5C 124 .
G F AX I NFORMATION FOR P R O GRAMMERS Fax Service Class 1 Commands F AX Se r vic e Cl ass 2.0 Comm ands In additi on to the stan dar d Class 2.0 fax com mands, 3Com i mplement s the fo llowing optio nal Class 2 .0 fa x comma nds: +FCLASS? What mode is in use D ata or Fax? +FCLASS=n (0,1 ,2.
G-2 A PPENDIX G: F AX I NFORMATION FOR P ROGRAMMERS Fax Mode Flow Cont rol Settin g Many facsimil e softwar e pr oducts use softwar e flow cont r ol when the modem is in Fax mo de. Thr oughou t our documen tation, we r ecommend that you u se hardware flow control for Data mode (factory set ting).
H V IEWING LED S This appen dix expl ains how to vi ew the twelve LEDs on the fr ont of your Business Modem. This LE D Status Means your Busi ness Modem Alert On Has detected a firm ware dowload error.
H-2 A PPENDIX H: V IEWING LED S TR On RS232 mo de: has detect ed DTR signa l USB mode: has detected successful USB re gistration Off RS232 mo de: has not detected DTR USB mo de: has not detected succe.
I S-R EGISTERS S-Regist ers S-Regi st ers: Thei r Fu nctions and De fault Se t tings Register Default F unction S0 0 Sets the num ber of ring s on which to a nswer in Auto Answer m ode. S0=0 di sables Auto Answe r. S0=1 enable s Auto Answer and the Business Modem answers on the fir st ring.
I-2 A PPENDIX I: S-R EGISTERS Register Default F unction S10 7 Sets the dura tion, in te nths of a s econd, tha t the Bus iness Modem waits afte r loss of c arrier before hanging up.
S-Regi sters I-3 S15 0 Bit-mapped register. ( See Chapter 1, Usi ng the AT Command Set, for instructions about how to set bit-mapped re gisters.) Bit Value Re sult 0 1 Disable th e Busi ness Mode m's ex tra high-freque ncy equalization if it causes problem s on short er-link c alls (for H ST modu lati on on l y).
I-4 A PPENDIX I: S-R EGISTERS S16 0 Bit-mapped register. ( See Chapter 1, Usi ng the AT Command S et, for instructi ons on settin g bit-mapped registers.) For testing, see Chapte r 14, Testing. Bit Value Re sult 2 4 Test pattern. 3 8 Remote di gital loo pback.
S-Regi sters I-5 Bit Value Re sult 3 8 Disable 21 00 Hz an swer tone to allo w two V.42 de vices to connect more quick ly. 4 16 See ne xt page . 5 32 See ne xt page . 7 128 Unus ual soft ware incom patib ility. Some sof t ware m ay not acce pt some result code s.
I-6 A PPENDIX I: S-R EGISTERS Bit Value Re sult 1 2 Disable th e Busi ness Mode m's enhance d, propr ietary V.32b is modula tion. Used for troubles hooting. 2 4 Disable the faster retrai ns that occur during p roprietary V.3 2terbo modula tion. Used for troubles hooting.
S-Regi sters I-7 Bit Value Re sult S53 126 Bit-mapped register. (Se e Chapter 1, Using th e AT Command Set, for instructions about how to set bit-mapped re gisters.) 0 1 Enable dial security. 1 2 Enabl e autopa ss fallba ck. 2 4 Enale local -access pas sword protecti on.
I-8 A PPENDIX I: S-R EGISTERS S56 0 Bit-mapped registe r primaril y used by 3Com Techni cal Support fo r debuggi ng purpose s. Bit Value Re sult 0 1 Disable n on-lin ear codi ng. 1 2 Disab le TX le vel de vi ation . 2 4 Disable p reem phasis. 3 8 Disable p recod ing.
J W ARRAN TY 3COM CORPOR A TION LIMITED W ARRANTY 3Com Office Connect 56K Bu sine ss Mode m 3C om war rants this hardware pr oduct to be f ree from defects in workmansh ip and mater ials , un der norm al use and ser v ice, fo r the lifet i me of the pr oduct fr om the dat e of pur chase fr om 3Com or it s authori zed r eseller .
J-2 A PPENDIX J: W ARRANTY data on an d after Ja nuary 1, 2000, and Customer not i fies 3Com b efore the l a t er of Ap ril 1, 2 000, or ni nety ( 90 ) days a fter pu r ch ase of the product from 3Com.
3COM CO RPORATION LIMITE D WARRANTY J-3 OF LA W , ST A TUTOR Y OR OTHERWISE, IN CLUDING W ARRANTIES , TERMS, OR CONDITIONS OF MER CH ANT AB ILI TY , FITNE S S FOR A P ARTIC ULAR PURPOSE, SA TIS F ACTORY QUALITY , CORRESP OND EN CE WITH DESCRIPTION , AND NON- INFRINGEMENT , ALL OF WH ICH ARE EX PRESSL Y DISCLAIM ED.
J-4 A PPENDIX J: W ARRANTY GOVERNING L A W: This Limit ed W arra nty shall be governed by the laws of th e State of Ca lifor nia , U.S.A . exc luding its co nflicts of la ws p rinci ples and excludi ng the Uni ted Nations Conventio n on Con tracts for the Internati onal Sale of Goods.
FCC Notice: Ra dio and Te levision In terference J-5 FCC Noti ce: Ra dio and T elev isio n Interference This equip ment has been tested and found to comply wit h the limits fo r a Class B digi tal de vice, p ursuan t to Part 15 of th e FCC Rules .
J-6 A PPENDIX J: W ARRANTY IC (Indus try Can ada) This digital appara tu s does not exceed the Class B li mi ts for radi o noise emission s from digi tal appa ratus set o ut in t he interference -causing equipm ent standa r d entitled D igital Appa ratus, IC ES-003 of Indu stry Canada.
G LOSSARY 16550 UAR T The fastest type of UART that is currently availab le. Adaptive Spee d Leve ling (AS L) Business Modem V .32 bis and V .32 terbo modems d etect improv ed li ne condit ions and shift upwar d again to the next hig her speed.
2 G LOSSARY dyna mically reverse the c hannels during a call if the volume o f data transfer chan ges. async hronous transmission Data tra nsmission in which the length of time between tr ansmitted characters may vary .
G LOSSARY 3 copies o f transmit ted frame s until they ar e posi tively ackn owledged by the r eceiving modem. byte A gro up of binary digit s stor ed and opera ted upon as a uni t. A byt e may ha ve a coded v alue equa l to a ch aracter in the ASCII code (letter s, number s), or h ave some other v alue mean ingful t o the computer .
4 G LOSSARY Class 1/EIA-57 8 An American sta ndar d used betwee n facsimi le appl icatio n pr ograms and facsimil e modems for sending an d rece iving Class 1 faxes. Class 2.0/E IA-592 An Amer ican sta ndar d used betwee n facsimi le appli cation pr ograms and fa csimi le mo dems f or se nding and rec eiving Class 2.
G LOSSARY 5 data mode The mo de in which the fax mod em is cap able of sendi ng and r ecei ving data f iles. A standard modem withou t fax cap abilitie s is always i n Data mode. data set Anothe r way of sayi ng "mo dem." data terminal equipme nt (DTE) The d evice tha t genera tes or is the fina l destina tion of data.
6 G LOSSARY error con trol V a rious tech nique s which che ck the reliabil ity of charac ters ( parity ) or blocks o f data. V .42, MNP and HST erro r contr ol pr otocols use err or detecti on (CRC) and r etra nsmission of e rror ed frames (ARQ). exp ansio n bus A series of slots inside a comp uter that allow for adding featur e car ds.
G LOSSARY 7 HDLC See High Level Data Lin k Contro l. High Spee d T e chnolo gy (HST ) 3Com ' proprie tary si gnalin g sc heme, desi gn an d error co ntrol protoc ol for high-sp eed modems.
8 G LOSSARY loca l echo A mo dem feat ure that enables th e modem t o send co pies of key-boar d commands and t ransmitt ed data to the scr een. Wh en the modem is i n Command mod e (not onl ine to anot her syste m) the local echo is invoked thro ugh the A TE1 command.
G LOSSARY 9 originate mode A state in which the mode m transmi ts at the p r edefin ed low frequency of the c ommunicat ions chann el and r eceives at the hi gh fr equen cy . The trans mit/r eceive f re quencies a re the r everse of the ca lled mod em which is in Answ er mod e.
10 G LOSSARY Read -Only Me mory (ROM ) Permanent memory , not user -progr ammable. The Business Mode m's factory set tings a re stored in ROM . re m ot e a c ce s s A featur e that allows a remo tely-loca ted user to view the Busin ess Mode m's c onf igurati on sc reens a nd c hange the Bus iness Mode m's confi guration .
G LOSSARY 11 stop bi t The signalin g bit attach ed to the end of each cha racter bef ore characte rs are transmitte d duri ng Asynch ronous T ransm ission.
12 G LOSSARY V. 1 7 An ITU-T stand ard fo r facsimile operations t hat specifi es modulati on at 14.4 Kb ps, wit h fallba ck to 12 Kbps . V .21-Fax An ITU-T sta ndard for facs imile o peratio ns at 30 0 bps. 3C om or compatibl e fax devices then tran smit or r eceive at high er speeds.
G LOSSARY 13 speed when li ne qualit y is impair ed, and fa ll back furthe r as necessary . They fall fo rward to the ne xt hi gher sp eed w hen line q uality improves. V .32 terbo Modulat ion scheme t hat extends the V .32 connect ion rang e: 4800, 7200, 96 00, 12K, 14.
14 G LOSSARY.
Un point important après l'achat de l'appareil (ou même avant l'achat) est de lire le manuel d'utilisation. Nous devons le faire pour quelques raisons simples:
Si vous n'avez pas encore acheté 3Com 56K c'est un bon moment pour vous familiariser avec les données de base sur le produit. Consulter d'abord les pages initiales du manuel d'utilisation, que vous trouverez ci-dessus. Vous devriez y trouver les données techniques les plus importants du 3Com 56K - de cette manière, vous pouvez vérifier si l'équipement répond à vos besoins. Explorant les pages suivantes du manuel d'utilisation 3Com 56K, vous apprendrez toutes les caractéristiques du produit et des informations sur son fonctionnement. Les informations sur le 3Com 56K va certainement vous aider à prendre une décision concernant l'achat.
Dans une situation où vous avez déjà le 3Com 56K, mais vous avez pas encore lu le manuel d'utilisation, vous devez le faire pour les raisons décrites ci-dessus,. Vous saurez alors si vous avez correctement utilisé les fonctions disponibles, et si vous avez commis des erreurs qui peuvent réduire la durée de vie du 3Com 56K.
Cependant, l'un des rôles les plus importants pour l'utilisateur joués par les manuels d'utilisateur est d'aider à résoudre les problèmes concernant le 3Com 56K. Presque toujours, vous y trouverez Troubleshooting, soit les pannes et les défaillances les plus fréquentes de l'apparei 3Com 56K ainsi que les instructions sur la façon de les résoudre. Même si vous ne parvenez pas à résoudre le problème, le manuel d‘utilisation va vous montrer le chemin d'une nouvelle procédure – le contact avec le centre de service à la clientèle ou le service le plus proche.
