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60

MT64DSU Owner's Manual

BACK-TO-BACK CABLE

1

8

Figure C-5. Back-to-Back Cable

DESCRIPTION

This cable lets you test a suspect DSU by connecting it to a known
good DSU. It tests the suspect DSU by connecting its Transmit
signal to the good DSUs Receive circuits. You can order it from
Multi-Tech (#45050000), or build one using the instructions below.
Refer to Chapter 4 for test procedures.

SCHEMATIC

RJ48S

1
2
3
4
5
6
7
8

7"

RJ48S

8
7
6
5
4
3
2
1

BUILD INSTRUCTIONS

1.

Strip cable installation 3/4".

2.

Strip wires 1,2,7 and 8 on one end of cable and 8,7,2 and 1 on
other end 1/4".

3.

Cut unstripped wires off.

4.

Solder wire 1 on one connector to 8 on the other.

5.

Solder wire 2 on one connector to 7 on the other.

6.

Solder wire 7 on one connector to 2 on the other.

7.

Solder wire 8 on one connector to 1 on the other.

8.

Cover solder connections with 1" of shrink tube.

Summary of Contents for MT64DSU

Page 1: ......

Page 2: ...vision Description B Manual revised Additional information on the CompuServe 6 10 96 Internet forums information on Multi Tech s Fax Back Service documentation of a new DIP Switch Summary editorial an...

Page 3: ...pter 2 Installation and Cabling Introduction 14 Unpacking 14 Safety Warnings 14 Cabling Procedure 15 DIP Switch Settings 16 Chapter 3 Testing Diagnostic Tests 22 DSU Loopback Test 22 Local Loopback Te...

Page 4: ...S 34 To log on to the Multi Tech BBS 35 To Download a file 35 About CompuServe 36 About the Internet 36 About the Multi Tech Fax Back Service 37 Appendixes Appendix A AT Commands and S Registers 40 Ap...

Page 5: ...MultiDSU64K Chapter 1 Introduction and Description...

Page 6: ...Data Services or switched 4 wire networks or compatible digital data services and 64 Kbps dedicated 4 wire services The unit contains V 35 and EIA RS 232C connectors on the back panel to connect a com...

Page 7: ...2 provides information on connecting the MultiDSU64K to a computer or DTE device and a DDS network The chapter provides a detailed description of each of the MultiDSU64K DIP Switch options with all de...

Page 8: ...loopback commands The MultiDSU64K contains the functions of a Data Service Unit DSU and a Channel Service Unit CSU in a single package DSU Functions The DSU encodes data as pulses on the communication...

Page 9: ...lear To Send The CTS Clear to Send LED lights when the MultiDSU64K generates a CTS in response to either an RTS signal received at the DTE connector or RTS forced on by the corresponding DIP Switch RT...

Page 10: ...4K to a computer or DTE device V 35 Connector The V 35 connector is used to connect the MultiDSU64K to a computer or DTE device RJ48S Jack The RJ48 line interface jack is used to connect the MultiDSU6...

Page 11: ...DDS interfaces provided Automatic rate adaption from DCE data rate to 56 Kbps or 64 Kbps line rate in both sync and async modes and elastic store for analog off net extensions multiple selectable clo...

Page 12: ...D 3 5 cm x 15 6 cm x 22 9 cm Weight 2 Lbs 9 Kg without power transformer 2 7 Lbs 1 2 Kg with power transformer Certification FCC Part 15 Class A FCC Part 68 UL Listed Compatibility AT T Pubs 62310 41...

Page 13: ...MultiDSU64K Chapter 2 Installation and Cabling...

Page 14: ...tiDSU64K Multi Rate DSU CSU Model MT64DSU Owner s Manual CTS CD RD SD S e n d R C V C a r r i e r C l e a r R e q u e s t O n L i n e Te s t RTS OL TM Multi Rate DSU CSU 64K Figure 2 1 Unpacking Safet...

Page 15: ...ecure the connection Or connect the 34 position rectangular V 35 connector to the V 35 receptacle 3 Connect the LINE Jack of the MultiDSU64K to the DDS receptacle using the line cord provided Note any...

Page 16: ...the chassis Each individual switch is numbered and can be in either an up OPEN or down CLOSED position Figure 2 2 MultiDSU64K PC Circuit Board The MultiDSU64K is shipped from the factory with the conf...

Page 17: ...elect the desired speed applications Note that first the asynchronous synchronous option must be chosen via DIP Switch 5 9600 bps Operation Switch 1 DN and Switch 2 DN 19200 bps Operation Switch 1 UP...

Page 18: ...tch 5 UP Synchronous Operation Switch 5 DOWN Factory Default Setting DOWN Switch 6 Request To Send Forced RTS Asynchronous Synchronous Mode With this option enabled the MultiDSU64K provides a continuo...

Page 19: ...r to Diagnostics Tests section in Chapter 4 Switch 9 Digital Loopback Test to the Line Refer to Diagnostics Tests section in Chapter 4 Switch 10 Remote Digital Loopback Test Refer to Diagnostics Tests...

Page 20: ...witched lines Note you must have this switch positioned in Switched Line mode UP in order to issue AT Commands Switched Line Switch 14 UP Dedicated Line Switch 14 DOWN Factory Default Setting DOWN Swi...

Page 21: ...MultiDSU64K Chapter 3 Testing...

Page 22: ...be the diagnostic tests available for the MultiDSU64K DSU Loopback Test This test lets you verify proper DSU operation by matching a transmitted signal to the looped back receive signal Refer to Appen...

Page 23: ...he following steps to perform the Local Loopback Test 1 Set DIP Switch 8 to the UP position 2 The front panel Test TM LED lights and if you send data from your DTE it should be looped back to your DTE...

Page 24: ...se the following steps to perform the Digital Loopback Test 1 Set DIP Switch 9 on the remote MultiDSU64K to the UP position 2 The front panel Test TM LED lights and if you send data from the local DTE...

Page 25: ...t the local MultiDSU64K Perform the following steps to enable this test 1 Set DIP Switch 8 to the UP position 2 Set DIP Switch 11 to the UP position 3 The front panel TM LED lights and if errors are d...

Page 26: ...sends and detects a predefined 511 bit pseudo random test pattern When an error is detected by the MultiDSU64K the CD Carrier Detect LED flashes 1 Set DIP Switch 9 on the remote MultiDSU64K to the UP...

Page 27: ...the following steps to perform the Remote Loopback Test 1 Set DIP Switch 10 on the local MultiDSU64K to the UP position 2 The front panel Test TM LED lights and if you send data from the local DTE it...

Page 28: ...sends and detects a pre defined 511 bit pseudo random test pattern When an error is detected by the MultiDSU64K the CD Carrier Detect LED flashes 1 Set DIP Switch 10 on the local MultiDSU64K to the UP...

Page 29: ...0000 from Multi Tech or assemble one Refer to Appendix B for instructions on building the Back to Back cable 2 Plug the cable into each DSU s LINE jack 3 On the good DSU set DIP switch 9 to the UP pos...

Page 30: ...30 MT64DSU Owner s Manual...

Page 31: ...MultiDSU64K Chapter 4 Warranty Service and Tech Support...

Page 32: ...fects in material or workmanship for a period of two years from the date of purchase or if proof of purchase is not provided two years from date of shipment MTS MAKES NO OTHER WARRANTY EXPRESSED OR IM...

Page 33: ...ation Please fill in the following information on your Multi Tech MultiDSU64K This will help tech support in answering your questions The same information is requested on the Warranty Registration Car...

Page 34: ...ith whom you spoke If you need to inquire about the status of the returned product be prepared to provide the serial number of the product sent Send MultiDSU64Ks to this address MULTI TECH SYSTEMS INC...

Page 35: ...1 From Main Menu type F to access Files Menu then D 2 Enter name of the file you wish to download from the BBS 3 If a password is required enter the password 4 Answer Y or N to the automatic logoff qu...

Page 36: ...col 7 If you select Zmodem the file will transfer automatically If you select another protocol you may have to initiate the transfer yourself In most data communications programs the PAGE DOWN key ini...

Page 37: ...t document number 10 for a catalog of available documents For convenience have your fax number ready ________________ From the catalog of available documents you can order newsletters white papers pre...

Page 38: ...38 MT64DSU Owner s Manual...

Page 39: ...MultiDSU64K Appendixes...

Page 40: ...synchronous V 25bis commands do not include any configuration commands you can however execute AT S Register commands to configure V 25bis mode operation The following sections describe which AT Comm...

Page 41: ...will accept either ATDT or ATDP dialing prefix H0 Hang up go on hook H1 Go on line off hook I ID information F Load factory default settings Zn ddd Store a telephone number ddd in phone number memory...

Page 42: ...fault settings S0 Auto Answer S0 0 Auto Answer Disabled S0 1 Auto Answer Enabled S0 2 Auto Answer under DTR control S1 Number of Redials S1 0 through 99 user selectable S2 Sync DTE Dialing S2 0 Sync D...

Page 43: ...ed S7 1 Echo Canceler Tone Enabled S8 RTS Control S8 0 RTS On S8 1 CTS follows RTS S9 DSR Control S9 0 DSR On S9 1 DSR off in Test Mode or when Off line S10 Not Used S11 Not Used S12 Async data bits e...

Page 44: ...d S15 1 DTR low to high Transition S15 2 AT Command S15 3 DTR or AT Command S16 V 25bis Auto Dialing Format S16 0 Bit oriented S16 1 Byte oriented S17 Not Used S18 Not Used S19 Parameter Lock Paramete...

Page 45: ...on These Result Codes when activated by an AT command are displayed on your video monitor ATQ0 enables Result Code display and entering ATQ1 disables Result Code display You can choose to have these R...

Page 46: ...DTR going high The DISABLED option prevents any auto dialing The factory default setting is V 25bis S2 2 V 25bis Auto Dial S16 The V 25bis data format may be either bit oriented HDLC like or byte ori...

Page 47: ...through S16 as well as the settings of DIP Switches 1 2 5 thru 7 and 12 can be loaded to the remote unit Param Lock S19 Setting this option ON prevents unintentional local changes in parameter settin...

Page 48: ...section includes a description of the command format and a list of V 25bis commands and responses List of Commands Dial Phone Number Provided CRN Command The CRN command permits the dialing of a phone...

Page 49: ...numbers and associated telephone numbers with any command letters and punctuation imbedded in each number The RLN command is similar to the Z command of the AT command set To list the V 25bis stored t...

Page 50: ...CNX Call connected DLCt Call delayed for t minutes number on Delayed list CFlrr Call failure indicator where rr equals et Engaged tone same as BUSY nt Call Answered but No Answer Tone rt Ring Tone th...

Page 51: ...ur site Your network provider will provide at your request a DDS line connecting the desired locations The figure below depicts a sample DDS Point to point application Figure B 1 DDS Point to Point Ap...

Page 52: ...station For data transmitted from the remote stations the MJUs combine bit streams from the remote stations into a single serial bit stream sent to the control station All stations on the same multip...

Page 53: ...other MultiDSU64K to be set for DDS timing refer to Chapter 2 of this manual The network cable connection requires cross over wiring the transmit pair of each MultiDSU64K must be connected to the rec...

Page 54: ...LICATION In this application the MultiDSU64K is used with conventional analog modems and lines to complete DDS circuits in an area where DDS is not available or where the customer requires an extensio...

Page 55: ...he modem at the end of the off net extension must have DDS Timing enabled In MultiDSU64K applications that use controlled carrier the CTS delay for the analog modem at the end of the off net extension...

Page 56: ...S CONNECTOR Pin 1 Pin 8 Key As viewed from the rear Figure C 1 RJ48S Connection DESCRIPTION This connector ties the MultiDSU64K to the DDS Network PIN IDENTIFICATION Pin Description Destination 1 N C...

Page 57: ...tion 2 Transmit Data SD DTE Transmitted Data 3 Received Data RD DCE Received Data 4 Request to Send RTS DTE Request to Send 5 Clear To Send CTS DCE Clear to Send 6 Data Set Ready DSR DCE Data Set Read...

Page 58: ...e Data B Receive Timing A Receive Timing B As viewed from the connector side Figure C 3 V 35 Connection DESCRIPTION This connector ties the MultiDSU64K to the DTE The V 35 connector has the following...

Page 59: ...back to the DSU for comparison to the original signal sent You can order this cable 45640100 from Multi Tech or build one using the instructions below SCHEMATIC RJ48S 1 2 3 4 5 6 7 8 6 RECEIVE RECEIV...

Page 60: ...instructions below Refer to Chapter 4 for test procedures SCHEMATIC RJ48S 1 2 3 4 5 6 7 8 7 RJ48S 8 7 6 5 4 3 2 1 BUILD INSTRUCTIONS 1 Strip cable installation 3 4 2 Strip wires 1 2 7 and 8 on one en...

Page 61: ...3 4 5 6 7 8 20 22 2 3 4 5 6 7 8 20 22 TxD RxD RTS CTS DSR GND CD DTR RI Male Male Figure C 6 Crossover Cable In applcations using the MULTIDSU64K for an off net extension a cross over cable is requir...

Page 62: ...n 7 UP DSR Controlled by DSU DN DSR Forced On 8 UP Local Loopback to DTE DN Normal Asynchronous DIP Switch Effect Sync Speeds 9 6K 19 2K 38 4K 57 6K 1 DN UP DN UP 2 DN DN UP UP 9 UP Digital Loopback t...

Page 63: ...nce number REN is used to determine the quantity of devices which may be connected to the telephone line Excessive RENs on the telephone line may result in the devices not ringing in response to an in...

Page 64: ...repairs void registration and warranty 8 This equipment cannot be used on public coin service provided by the telephone company Connection to Party Line Service is subject to state tariffs Contact th...

Page 65: ...Set Ready 19 Dedicated Switched Line Opera tion 20 Default Settings F 47 Dial Phone Number Provided CRN Command 48 Dial Phone Number Stored in Memory CRS Command 48 Digital Interface 12 Digital Loopb...

Page 66: ...Param Download W 47 Param Lock S19 47 Parameter Lock 44 Parity S14 46 Point to Point Application 51 Power 14 Power Requirements 12 Power supply 15 R Receive Levels 12 Recording MultiDSU64K Informa tio...

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