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Содержание 3874

Страница 1: ...Systems GA33 0002 3 TP 09 IBM 3874 Modem User s Guide...

Страница 2: ...added and Appendix C removed These sections should therefore be read in their entirety Elsewhere changes to the text and or illustrations are indicated by a vertical line to the left of the change Ch...

Страница 3: ...and glossary that explains terms used in the manual Differences as a result of national require ments between 3874 modems are summarized Describes equipment and programming considerations for back up...

Страница 4: ...of Data Transfer 12 DAA CBS Used DAA CDT Used 15 Modem Tests 16 Overheating 16 Tests by Operator 16 Problem Determination 17 Procedure I Point to Point 18 Procedure II Multipoint All or more than one...

Страница 5: ...44 Dimensions 44 Service Clearances 44 Weight 45 Heat Dissipation 45 External Power Supplies 45 Environmental Requirements 45 Connector and Cable Locations 45 Data Terminal Equipment Connector Basic...

Страница 6: ...line point to point 12 Canada 57 9 Equalization in non switched line centralized 35 Telephone handset connection for Alternate Voice multipoint 13 feature 58 10 Equalization in switched network 14 36...

Страница 7: ...Part 1 General Information D Part 2 Operator s Information Part 3 Technical Description Part 4 Appendixes D vii...

Страница 8: ...Note All the controls shown cannot be present at the same time on a given 3874 as some of the features are mutually exclusive Frontispiece IBM 3874 Modem 18818 viii...

Страница 9: ...rt 1 General Information I This part of the manual introduces the IBM 3874 Modem its highlights and its possible configurations a more technical description is given in Part 3 Part 1 General Informati...

Страница 10: ...example when station A see Figure 1 sends data to station B modem A modulates the data and sends the modulated signal over the telephone line Modem B receives the modulated signal from the telephone l...

Страница 11: ...switched line to a switched network if non switched line operation becomes impractical and to operate at 4800 bps on the Manufactured by American Telephone and Telegraph Company switched network in U...

Страница 12: ...ature Decision Point to Point Multipoint Tributary Multipoint Control Switched Network with DAA Type CBS and Auto Answer Figure 2 Required and optio al features 1162SB 4 3874 User s Guide CBS Automati...

Страница 13: ...ow the operator or DTE if this switch is set to EXTERNAL to select the switched network 2 DTE interface is modified 3 Additional telephone line interfaces are provided for connection to the DAA CBS or...

Страница 14: ......

Страница 15: ...Pa rt 2 0 pera to r s Inform ati on This part of the manual is intended for operators using the IBM 3874 Modem OPERATE TEST SWITCH The eight position operate test rotary switch is set to OPERATE for...

Страница 16: ...LUME OFF EON 0 b02 0 00 04 O o LAMP TEST o PAUSE o M E A L l f SEP 0 90 05 OoO ENTER 8 7 6 Funct on Sw tch VOLUME Switch Manual Dialing Switches When this switch is set to OPERATE the ACO is controlle...

Страница 17: ...the setting of the operate test switch Speed Mode Select Switch Must be set the same as other modems on the same line 4800 NON SW setting is for 4800 bps dedicated channel 2400 NON SW setti g is for...

Страница 18: ...data transfer When the talk data switch is initially set to TALK an incoming call will sound the ringer of the telephone set associated with the DAA and the call must be answered manually Subsequentl...

Страница 19: ...set Yes The involved station initiates an equalization procedure For local station in T1 A T1 Band T2 For local and remote station in OPERATE or T3 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes If previousl...

Страница 20: ...atically whenever The operate testswitch is set to OPERATE The speed mode select switch is set to4800 NON SW 2400 NON SW or EXTERNAL Power is switched on Note For switched rietwork applications see th...

Страница 21: ...s successful Data set ready remains off Retry at least twice If Data set ready rises Ready for data communicat ion Use reset switch to retry equalization Equal indicator turns off 9s of equalization...

Страница 22: ...I_ J 9s of equalization 1Bs of equalization No Yes after 18s Yes after 18 s Local and remote equalization successful L ocal equalization successful Data set ready remains off No Data set ready rises Y...

Страница 23: ...t a Multipoint Tributary Station 1 Press the reset switch Equalization of the tributary station provided that it has been previously equalized by the control station and that the control station is ac...

Страница 24: ...witch back to OPERATE b Wait for at least 10 seconds c Switch back to OPERATE on your 3874 Multipoint a Tributary station s switch back to OPERATE b Control station switches back to OPERATE with no de...

Страница 25: ...tion Voice Exclusion Key CAUTION CBS Data When going to data mode handset cradled ensure that the handset is placed correctly horizontal on the cradle Never depress the cradle button with the finger W...

Страница 26: ...espectively Both possibilities are considered in the following table II CBS_ CBS Operator Action Indicator On Audible Signal 1 Make the DTE ready Ready 2 Set the talk data switch to TALK 3 Remove the...

Страница 27: ...both ends IJ CDT CDT Operator Action 1 Make the DTE ready 2 On the 3874 set the talk data switch to TALK 3 Raise the handset and dial the desired station 4 5 Voice communication to arrange transmit r...

Страница 28: ...ta communication is complete the operator disables the terminal or sets the 3874 to TALK Auto Answering CBS only To have incoming calls answered automatically set the 3874 and prepare the DAA CBS as f...

Страница 29: ...ering with CBS but with CDT at the other end Im cnT CBS Operator Action 1 Talk data switch was previously set to TALK 2 Lift the telephone handset 3 Pull the exclusion key on the telephone set 4 Voice...

Страница 30: ...with CBS at the other end mCBS CDT Operator Action 1 2 Set the talk data switch to TALK 3 Lift the telephone handset 4 Voice communication with the calling operator to arrange transmit receive Note I...

Страница 31: ...ss ENTER until present next digit indicator goes off 9 Release ENTER and wait for ringback tone 10 Dialing complete 11 12 Answer tone ends 13 14 15 Ready for data communication COMPLETION OF DATA TRAN...

Страница 32: ...modem and one of the tributary modems never between tributaries Tests A B and E may be carried out for public switched network operation Test B however requires program ming support in the attached D...

Страница 33: ...2 a fault is indicated by the operate indicator on the receiving 3874 going out momentarily after the equalization period 9s for tests A C and D 18s for test E A flash rate of from one to two flashes...

Страница 34: ...eed with Procedure I e If problem is in switched network back up only proceed with Procedure IV Figure 13 Selection of problem determination procedure 11653A 26 3874 User s Guide checking or testing p...

Страница 35: ...al and Go to 5 equal indicators on Go to 3 Call modem A CE Call modem 8 CE Operate signal and 1 Continue traffic at 2400 bps 1 Contact PTT to check the equal indicators on 2 Contact PTT to check the l...

Страница 36: ...ontact PTT to check the line between control and line between control and furthest tributary station I I control station on furthest tributary station 2 Go to 5 T3 Operate signal andj 3 Go to 5 equal...

Страница 37: ...tributary on Yes Switch settings correspond Go to 2 Restart and continue traffic When control station is Free no more traffic with other tributaries Go to 4 1 Check program and restart 2 If problem re...

Страница 38: ...800 SW T1A RESET 5 cEB 4800 SW T1A RESET 30 3874 User s Guide Expected Result Yes No Same at Switch settings correspond Switch settings do not both stations Go to 2 correspond correct the settings and...

Страница 39: ...o 10 1 Con tact common carrier T 1 and equal to check the line T indicators at 2 Go to 8 R R station A permanently on 4800 SW 4800 SW T4 T3 RESET 9 Restart Operation 10 T2 RESET 11 T2 RESET If DTE can...

Страница 40: ...rough indicator on 1 7 Dial tone at r 1 calling station 8 Dial tone at css telephone set 1 9 Present next digit indicator on 10 Dial the number of a nearby telephone that can Nearby telephone be heard...

Страница 41: ...ocedure Ill 17 Set local talk data switch to DATA and cradle handset 18 Ringback tone at station A Busy tone at station A Ringback tone stops at station A Answer tone at station A Answer tone ends at...

Страница 42: ......

Страница 43: ...Description This part of the manual is intended for system and installation planning engineers who require a more detailed description of the IBM 3874 Modem than that given in Part 1 Part 3 Technical...

Страница 44: ...e transmitted simultaneously in both directions Transmitters and receivers are permanently on IBM 3874 Modem Each receiver is held continuously synchronized by the remote transmitter Data transmission...

Страница 45: ...Figure 15 Switched Network I BM 3874 Modem I BM 3874 Modem CBS T I I I I T n m e t t Receiver __J L__ Receiver Local Switched Network Remote 0 DTE Switched Network Back Up I BM 3874 Modem Transmitter...

Страница 46: ...Ready Calling Indicator Received Data Received Line Signal Detector Receiver Signal Element Timing Switched Network Operation j Legend l Automatic Equalizer Figure 16 Block diagram of 3874 11661A 38 3...

Страница 47: ...Memory to Store the equalization parameters for each tributary Tributary Modems 6 max T T R Figure 17 Automatic equalizer locations 11662AJ Then the equalization process starts for 9s in both directio...

Страница 48: ...NCHRONIZATION Before data can be sent from one 3874 to another the receiver of the receiving modem has to be synchronized with the transmitter of the transmitting modem Once this synchronization is ac...

Страница 49: ...Calling Indicator Ring Indicator Test t Protective Ground Signal Ground Legend DTE controls these lines ____ 3874 controls these lines Common lines t Test is not a CCITT standard __ When there is a di...

Страница 50: ...e If a re equalization is initiated while request to send is on ready for sending Remains on at a control modem during the equalization Drops at a tributary modem during the equalization Remains on or...

Страница 51: ...nal element timing Figure 23 The modem cannot use clocking signals generated by the DTE Sampling Times i On 11 11 11 r1 Receiver Signal Element Timing _J J L J L J t__ Off ItI I I I I I I Rece ved Dat...

Страница 52: ...ta 2 Continues transmission until the data received just before data terminal ready going off has been transmitted 3 Causes the DAA CBS to go on hook and to disconnect the modem from the line 4 Drops...

Страница 53: ...digit can be accepted Data Line Occupied Direction From ACO The ACO sends data line occupied in reply to call request if the line is occupied as indicated by Ring indicator on DAA CBS associated hands...

Страница 54: ...t 2 signals are exchanged as follows 1 The DAA detects the ringing signal and sends RI to the 3874 2 If the DTE is ready the 3874 signals off hook OH to the DAA 3 As soon as the DAA is ready CCT on th...

Страница 55: ...which is sent only to the DTE that issued request to send The 3874 ignores any signals on the transmitted data lines coming from DTEs that have not raised request to send With switched network operat...

Страница 56: ...ns and at least three modems From the operational standpoint the configuration is the same as an equivalent configuration where each tributary station has its own modem Figure 26b does not represent a...

Страница 57: ...11671I t 1 r 1 3874 F r 3874 F 3874 3874 F r 3874 DTE DTE DTE DTE DTE DTE DTE DTE DTE DTE Tributary Stations 1 2 3 Tributary Stations 1 2 3 4 5 6 7 To eliminate the synchronization delay when changin...

Страница 58: ...dBm to 17 dBm in 1 dBm steps Mandatory in multi point control Optional in point to point can be used with fan out feature Control Station Prevents the control Reduces the equaliza station from pollin...

Страница 59: ...earances Given in Figure 28 28 22 55 9 6 15 3 Figure 28 Service clearances 17914A Weight Maximum with All Features I lb 65 kg 29 5 Heat Dissipation BTU hour 600 max kcal hour 150 max External Power Su...

Страница 60: ...ving and terminating circuits must meet CCITT recommendation V24 and or EIA standard RS 232 c Connector Identification DTE 3874 r I Telephone DAA I Line L ____ I J3 J4 J5 Pin Locations 13 12 11 10 9 8...

Страница 61: ...Ground 13 Distant Station Connected 14 Digit Signal 1 15 Digit Signal 2 16 Digit Signal 4 17 Digit Signal 8 22 Data Line Occupied Figure 31 Data terminal equipment 3874 ACO interface 11676 DAA CBS CO...

Страница 62: ...ound Green Yellow Countries Using 60 Hz Phase Neutral 3874 Length 6 ft 1 83m Line Cable Non Switched U S A or Canada 3874 11 ft 3 35 Cable entry is at rear of plug Length 10 ft 3 05m 15 ft 4 57m 20 ft...

Страница 63: ...4 Length 10 ft 3 05m 15 ft 4 57m 20 ft 6 1Om 25 ft 7 62m Connection to DAA CBS 3874 J2 25 pin Plug Fixed to socket by knurled screws to permit quick release Length 10 ft 3 05m 15 ft 4 57m 20 ft 6 1Om...

Страница 64: ...eive pair to BK and Y Japan Connection to a voice band private non switched Dl line is to be made via a four pin IBM provided socket to a PDlA 56 3874 User s Guide protective device The customer insta...

Страница 65: ...lity CCITT recommendation M102 Consult your IBM representative to obtain information on specific procedures and facilities available in your country Permitted transmit power level and signal to noise...

Страница 66: ...gs the correct plug being provided with the alternate voice feature The connections to the plug are shown in Figure 35 Ring I I __ Ring Sleeve Tip or Receiver Transmitter In some countries for example...

Страница 67: ...Part 4 Appendixes Part 4 Appendixes 59...

Страница 68: ...t 3 Switched Network feature and 1 See under Variations 3 Switched Network Back Up Available Not available in Part 1 for descriptions features 2 See Switched Network Setting Up the Line 17 in Part 2 f...

Страница 69: ...available with all access methods see under Equipment Selection at CPU End for details of documentation available Planning a system that will accommodate switched network back up operation involves th...

Страница 70: ...j 1 Switched Network c Two Modems Two Multiplexers One 3874 equipped with Point to Point or Multipoint Control feature One 3874 equipped with Switched Network feature Multiplexer 1 _ l Alternative Mul...

Страница 71: ...uplex see Figure 15 The DTE must be permanently wired for half duplex control of the request to send interface line Where appropriate duplex throughput is maintained by strapping the 3874 for continuo...

Страница 72: ...CAM Customer s Application 115 125 ICAs 270X 370X EP 270X 370X EP b BSC Operation with Half Duplex Data or SDLC Operation with Duplex Data CPU Operating System OS VS TCAM VTAM CPU 370X NCP 370X Operat...

Страница 73: ...704 05 NCP Mode VTAM NCP Figure 41 Access methods communication controllers 20406 Equipment Selection at CPU End Planning the back up of links in a system environment requires a careful evaluation of...

Страница 74: ...terminal that is normally on a multipoint non switched line requires use of multipoint procedure programming support 66 3874 User s Guide at the multiplexer with a polling or addressing list of one te...

Страница 75: ...answering and disconnecting by controlling the data terminal ready interface line SNBU with DAA CDT 270X 370X EP Yes 1 115 125 ICA s Multiplexer 370X NCP BSC terminals except 2770 2780 3270 Yes 2770 2...

Страница 76: ...e Manual call at CPU manual answer at terminal or remote 370X e Manual call at CPU auto answer at terminal or remote 370X e Auto disconnect at CPU manual disconnect at terminal e Manual or auto call a...

Страница 77: ...erican National Standard Definition FCC Federal Communications Commissions Hz hertz cycle per second ICA kcal ms PTT s SNBU sync Integrated Communication Adapter kilocalorie millisecond Post Telegraph...

Страница 78: ...equipment and a 70 3874 User s Guide modem see Figure 1 Strap Strapping Selectable wmng to provide optional variations in the performance of equipment Switched Line Switched Network A communication l...

Страница 79: ...ous carrier 37 42 50 control characters 45 control circuit 38 control station problem determination 26 controls for operator 7 country differences 60 coupler cut through 46 customer responsibilities 5...

Страница 80: ...3874 User s Guide indicator coupler cut through 8 data channel ready 8 data line occupied 8 equalization 9 off hook 8 operate 9 present next digit 8 ready 9 signal 9 interface K data access arrangemen...

Страница 81: ...nterface 44 R ready for sending 42 received data 42 received line signal detector 43 receiver 38 receiver signal element timing 43 reception of data 38 remote wrap test non switched line 24 25 request...

Страница 82: ...end to end non switched line 24 25 switched network 24 25 modem internal wrap 24 25 modem DTE wrap 24 25 remote wrap non switched line 24 25 74 3874 User s Guide test interface signal 44 test pattern...

Страница 83: ...the IBM Branch Office serving your locality Possible topics for comment are Clarity Accuracy Completeness Organization Index Figures Examples Legibility What is your occupation ______________________...

Страница 84: ...ions become the property of IBM Fold Fold 1 Fold Business Reply Mail No postage stamp necessary if mailed in the U S A Postage will be paid by International Business Machines Corporation Department 81...

Страница 85: ...the subject publication Pages to be inserted and or removed are 29 through 32 Changes to the text or to an illustration are indicated by a vertical line to the left of the change Summary of Amendment...

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Страница 88: ...es Ce rpc ratlon Dat11 P ocessfng l ivlsJon 1133 Westch ster Averif 1 V hit Plains New York 10eo4 U S only IBM world Trade Corporatie n a21 United N ations rs1aza New York New York 10 011 lnternatlo n...

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