AT&T 3550 - Manuals

COMSPHERE 3550 Series Data Service Units C February 1995 3550-A2-GB20-10 Notices " " " " " " ! " "" !

Safety Instructions D 3550-A2-GB20-10 February 1995 Government Requirements The Federal Communications Commission (FCC) requires that instructions pertaining toconnection to the telephone network be included in the installation and operation manual. Specificinstructions are listed in this section. N...

i 3550-A2-GB20-10 February 1995 Table of Contents Preface About This Guide vii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to Use This Guide vii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related Documents viii . . . . . . . ...

COMSPHERE 3550 Series Data Service Units ii February 1995 3550-A2-GB20-10 4. Operating the DSU Overview 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DCP and SDCP Operation 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Table of Contents iii 3550-A2-GB20-10 February 1995 List of Figures Figure Page 2-1 Model 3550 Hardware Switch Location (shown without a TDM/Flex) 2-3 . . . . . . . . . . 2-2 Model 3550 Electrical Connection 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Model 35...

COMSPHERE 3550 Series Data Service Units iv February 1995 3550-A2-GB20-10 List of Tables Table Page 1-1 General Technical Specifications 1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 DSU Technical Specifications 1-6 . . . . . . . . . . . . . . . . . . . . . ...

vii 3550-A2-GB20-10 February 1995 Preface About This Guide This user’s guide provides the information needed to install and operate your Model 3550 or 3551 data serviceunit (DSU), which may or may not be equipped with adial backup module (DBM) or time division multiplexer(TDM). If your DSU is not eq...

COMSPHERE 3550 Series Data Service Units viii February 1995 3550-A2-GB20-10 Related Documents Other product documentation includes the following: 3000-A2-GA31 COMSPHERE 3000 SeriesCarrier, Installation Manual 3000-A2-GB41 COMSPHERE – 48 Vdc CentralOffice Power Unit, InstallationGuide 6700-A2-GB41 CO...

1-1 3550-A2-GB20-10 February 1995 About Your DSU Overview 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard Features 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

COMSPHERE 3550 Series Data Service Units 1-2 February 1995 3550-A2-GB20-10 • Diagnostic Control Panel control. TheModel 3550 DSU is controlled from its diagnosticcontrol panel (DCP). The diagnostic control panelfor the Model 3551 DSU, called a shared diagnosticcontrol panel (SDCP), is installed in t...

About Your DSU 1-3 3550-A2-GB20-10 February 1995 2-Port TDM/Flex The 2-port TDM/Flex is a separate circuit card that attaches to the Model 3550 DSU. It allows independentports to share one standard digital point-to-point facility.The 2-port TDM/Flex provides the following features: • Port capacity. ...

COMSPHERE 3550 Series Data Service Units 1-4 February 1995 3550-A2-GB20-10 Table 1-1 (1 of 2) General Technical Specifications Specifications Criteria APPROVALS FCC Part 15 FCC Part 68 UL 3550 DSU3551 DSU, 3000 Series Carrier CSA Safety 3550 DSU3551 DSU, 3000 Series Carrier Emissions Bell Canada Cla...

COMSPHERE 3550 Series Data Service Units 1-6 February 1995 3550-A2-GB20-10 Table 1-2 DSU Technical Specifications Specifications Criteria APPLICATION Full- or half-duplex data transmission via point-to-point or multipointDDS network, or local area data channel COMMUNICATION LINE Leased or private 4-...

About Your DSU 1-7 3550-A2-GB20-10 February 1995 Table 1-3 V.32 DBM Technical Specifications Specifications Criteria RINGER EQUIVALENCE NUMBER (REN) DBM option 0.7B APPLICATION Full- or half-duplex data transmission via analog 2-wire dial network,point-to-point MODULATION AND FREQUENCY At 14.4 and 1...

COMSPHERE 3550 Series Data Service Units 1-8 February 1995 3550-A2-GB20-10 Table 1-4 2-Port TDM/Flex Technical Specifications Specifications Criteria APPLICATION Multiplexing Digital sharing Provides time division multiplexing of two independent ports. Allows consecutive ports to share the same TDM/...

About Your DSU 1-9 3550-A2-GB20-10 February 1995 Out of Warranty If your equipment is out of warranty and you do not have a maintenance support agreement, factory repairsupport is available. To send equipment to AT&T Paradyne’s Repair Center, call the following toll-free number Monday throughFri...

2-1 3550-A2-GB20-10 February 1995 Installing the Model 3550 DSU Overview 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Before You Begin 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

COMSPHERE 3550 Series Data Service Units 2-2 February 1995 3550-A2-GB20-10 circuit must be capable of supplying a minimum of2 amperes at 115 Vac. Refer to the TechnicalSpecifications section in Chapter 1 for additional powerrequirements. CAUTION The ac transformer contains a3-wire grounding-type plu...

Installing the Model 3550 DSU 2-3 3550-A2-GB20-10 February 1995 Figure 2-1. Model 3550 Hardware Switch Location (shown without a TDM/Flex) Table 2-1 Model 3550 DSU Switch Settings Switch Position Switch Setting Function S1-1 ON (default) Permissive V.32 DBM transmit output level of –9 dBm S1 1 Off P...

COMSPHERE 3550 Series Data Service Units 2-4 February 1995 3550-A2-GB20-10 Where to Place the DSU As mentioned earlier, the DSU must be placed within 6 feet of a dedicated grounded ac outlet that is protectedby a circuit breaker. The distance between the DSU and its DTE must be within EIA-232-D/V.24...

Installing the Model 3550 DSU 2-5 3550-A2-GB20-10 February 1995 Power-Up Routine When power is applied, the DSU: • Determines what options (DBM or TDM/Flex) areinstalled, if any. • Runs a Device Test on itself and each of theinstalled options. During the tests, all indicators on the DCP lightbriefly...

COMSPHERE 3550 Series Data Service Units 2-6 February 1995 3550-A2-GB20-10 Connecting to the NMS A 3600 Hubbing Device is required to connect the control DSU to the 6700 Series NMS. When connected tothe NMS, the DSU can be controlled and configured fromthe NMS rather than from the DCP alone. . Proce...

COMSPHERE 3550 Series Data Service Units 2-8 February 1995 3550-A2-GB20-10 Table 2-2 LADS Connection Distances Data Rate Wire Gauge (AWG) Data Rate (kbps) 19 22 24 26 2.4 20.0 mi (32.2 km) 16.6 mi (26.7 km) 12.7 mi (20.5 km) 9.4 mi (15.1 km) 4.8 19.4 mi (31.2 km) 12.7 mi (20.5 km) 9.6 mi (15.4 km) 7...

Installing the Model 3550 DSU 2-9 3550-A2-GB20-10 February 1995 Tributary DSU Addressing Tributary DSU addresses are user-definable, but take care that their addresses are unique on a multipoint circuit.If two tributaries are assigned the same address, you willnot be able to communicate with either ...

COMSPHERE 3550 Series Data Service Units 2-10 February 1995 3550-A2-GB20-10 Connecting the DSU to a DTE The DSU’s rear panel has both a 25-pin EIA-232-D/ V.24 connector and a 34-pin CCITT V.35 connector (usedfor higher operating speeds). You can use either interface. When the unit is equipped with a...

Installing the Model 3550 DSU 2-11 3550-A2-GB20-10 February 1995 Connecting Port 2 For the EIA-232 cable, install as described above. For the V.35 cable, install the V.35 Interconnect Cable, then the V.35 DTE cable as follows (refer to Figure 2-7). . Procedure 1. Reconfigure the port to match the in...

COMSPHERE 3550 Series Data Service Units 2-12 February 1995 3550-A2-GB20-10 Verifying DBM Operation If a DBM is installed, test the tributary DBM for dial tone, and verify that the DSU can place and receivecalls. . Procedure 1. Select Bckup (F2). 2. Select Dial to establish a dialed call to the trib...

3-1 3550-A2-GB20-10 February 1995 Installing the Model 3551 DSU Overview 3-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Before You Begin 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

COMSPHERE 3550 Series Data Service Units 3-2 February 1995 3550-A2-GB20-10 Before You Begin The COMSPHERE 3000 Series Carrier should already be installed properly and be operational, with afunctioning shared diagnostic control panel (SDCP). AnSDCP (installed in the carrier) is required for installat...

Installing the Model 3551 DSU 3-3 3550-A2-GB20-10 February 1995 Figure 3-1. Model 3551 DSU Switch and Jumper Locations Table 3-1 Model 3551 DSU Switch Settings Switch Position Switch Setting Function S1-1 ON (default) Permissive V.32 DBM transmit output level of –9 dBm S1-1 Off Programmable V.32 DBM...

Installing the Model 3551 DSU 3-5 3550-A2-GB20-10 February 1995 Installing the DSU The initial installation procedure for the Model 3551 DSU requires the installation of a rear connector plateonto the rear of the COMSPHERE 3000 Series Carrier(Figure 3-2). After the initial installation, the DSU can ...

COMSPHERE 3550 Series Data Service Units 3-6 February 1995 3550-A2-GB20-10 4. Using a Phillips screwdriver, loosen the screw holding the circuit pack lock and rotate the lock tothe open position (Figure 3-3). Open the latch. 5. At the front of the carrier, hold the DSU vertically with the latch on i...

Installing the Model 3551 DSU 3-11 3550-A2-GB20-10 February 1995 To Connect the SDCP to a DSU For the carrier-mounted Model 3551 DSU, the SDCP must first be reconnected to the DSU. Once connected, theSDCP operates like a DCP. . Procedure 1. Press the Select key (refer to Figure 3-2). A screen simila...

COMSPHERE 3550 Series Data Service Units 3-12 February 1995 3550-A2-GB20-10 Other Tests The following lists the tests available on your DSU. Refer to the Test Branch section of Chapter 4 for furthertest information, as well as more detail on how toconfigure and operate the DSU. Refer to Appendix A t...

COMSPHERE 3550 Series Data Service Units 4-2 February 1995 3550-A2-GB20-10 Control Branch 4-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmitter Control 4-19 . . . . . . . . . . . . . . . . . . . . . ...

Operating the DSU 4-3 3550-A2-GB20-10 February 1995 Figure 4-2. SDCP and Model 3551 DSU Faceplate Both control panels have a 2-line, 16-character liquid crystal display (LCD) and a keypad, through which youcan • Monitor the unit’s health and status • Initiate dial backup • Initiate diagnostic tests ...

COMSPHERE 3550 Series Data Service Units 4-4 February 1995 3550-A2-GB20-10 F1 F2 F3 • The key returns you to the top-level menu, and terminates any work in progress. • The key returns you to the previous display, one level up from the current display. It can also beused to terminate a data entry dis...

Operating the DSU 4-5 3550-A2-GB20-10 February 1995 Expanded Health and Status Expanded Health and Status (Expan) only appears during automatic dialing. It retrieves Health and Statusinformation for the local DSU after an automatic backupattempt has failed, or when there is a disconnect after asucce...

COMSPHERE 3550 Series Data Service Units 4-6 February 1995 3550-A2-GB20-10 Table 4-1 Identity Descriptions Description Information Displayed Model: 3550 or 3551. S#: Unit serial number. DSU SW ver: Software/firmware version residing on DSU. Netwrk Addr: Unit’s network address. DSU Rate: Value set fo...

Operating the DSU 4-7 3550-A2-GB20-10 February 1995 If the tributary DSU is to initiate the call, set thecontrol for Cllbk and the tributary for Pswrd. External DBU Option Set (This option set will not appear if a DBM is installed.): • ExtBU – Select whether the external DBU willanswer or place back...

COMSPHERE 3550 Series Data Service Units 4-8 February 1995 3550-A2-GB20-10 Table 4-2 Backup Branch Menu Selections Current Backup Mode Backup Command Effect Idle Bkup Dial Dial out, establish, and switch to dialed link (Dial Backup mode). Dial out and establish dialed link (Standby mode). (Data is r...

Operating the DSU 4-9 3550-A2-GB20-10 February 1995 Test Branch The Test branch provides extensive testing capabilities for the DSU, the DDS circuit, the DBM (if installed), andthe backup circuit. When the tributary DSU receives a testrequest from the control DSU, it aborts any locallyinitiated test...

COMSPHERE 3550 Series Data Service Units 4-10 February 1995 3550-A2-GB20-10 NOTE To issue a Local Loopback to a tributary DSU, the DSU must have aDBM installed or a Conflict w/ Environ message will appear. The DBM isrequired to call the tributary and abortthe Local Loopback. If the NMS is to abort t...

Operating the DSU 4-11 3550-A2-GB20-10 February 1995 Table 4-3 Digital Test Results Results Information Displayed Time: Running test timer. (The Clrselection resets the timer to0:00:00.) Tot Error: Running count of bits in error;Max, if the maximum errorcount has been reached, themaximum being 64000...

COMSPHERE 3550 Series Data Service Units 4-12 February 1995 3550-A2-GB20-10 Table 4-5 Bit Error Rate Test Results Results Information Displayed Time: Running test timer. (The Clrselection resets the timer to0:00:00.) Tot Error: Running count of bits inerror; Max, if the maximum error count has been ...

Operating the DSU 4-13 3550-A2-GB20-10 February 1995 6. Select the mode: • Enable Full Mode (F2) – All configurationoptions will be displayed. • Disable Full Mode (F3) – Only thoseconfiguration options likely to change will bedisplayed. When the selection is made, it is displayed on thefirst line of...

COMSPHERE 3550 Series Data Service Units 4-14 February 1995 3550-A2-GB20-10 5. Select Save (F1). The Save to screen appears. 6. Select Activ (F1). The selected application’s configuration is savedto the DSU’s Active operating area, and theCommand Complete message appears. Configuration Options The C...

Operating the DSU 4-15 3550-A2-GB20-10 February 1995 16. Select SAVE (F1). 17. Save to Activ (F1). Command Complete appears to confirm that theconfiguration is saved. Poll List The Poll List (PList) subbranch maintains or changes the DSU’s poll list. A control DSU’s poll list includes alltributary D...

COMSPHERE 3550 Series Data Service Units 4-16 February 1995 3550-A2-GB20-10 To delete a network address (e.g., 3) from the poll list: . Procedure F1 C h n g P o l l L i s t : Activ Delet Skip F2 F3 1. Select Delet (F2). F1 A d d r e s s : 3 Enter F2 F3 2. Select Enter (F3). In this example, 3 was ju...

Operating the DSU 4-17 3550-A2-GB20-10 February 1995 Directory The DSU’s dial backup Directory (Dir) can store up to ten telephone numbers (dial strings) so the DBM can callother DBMs or modems. Directory entries are numberedfrom 1 to 10. Each dial string in the directory can be up to36 characters i...

COMSPHERE 3550 Series Data Service Units 4-18 February 1995 3550-A2-GB20-10 10. Press the key to return to the Enter Dir screen. 11. Press the F3 key to Save the entry. 12. Verify that the number was loaded by pressing the key again and selecting Load (F2). The telephone number should appear as ente...

Operating the DSU 4-19 3550-A2-GB20-10 February 1995 6. Select Save (F2). The DSU displays the address assigned along witha Command Complete message. If an error was made in entering the address: . Procedure 1. Press the key to return to the Configure screen. 2. Re-select Addr, and re-edit the addre...

COMSPHERE 3550 Series Data Service Units 4-20 February 1995 3550-A2-GB20-10 Table 4-7 Lead States Symbol Meaning Off (below text line) ON (above text line) Changing ? Indicates an illegal value NOTES: Input leads A and B: Off ( ) when voltage on lead is less than +.8V. ON ( ) when voltage on lead is...

5-1 3550-A2-GB20-10 February 1995 Configuring the Unit Overview 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Using the DCP to Set Configuration Options 5-2 . . . . . . . . . . . . . . . . . . ....

COMSPHERE 3550 Series Data Service Units 5-2 February 1995 3550-A2-GB20-10 Once loaded, the following Edit/Save submenu appears: F1 Edit / Save:SAVE DSU DBM F2 F3 Press the or key to scroll the following configuration option sets into view: DSU, Diagnostic(DSU, DBM, External DBU, and General), DBM,E...

Configuring the Unit 5-3 3550-A2-GB20-10 February 1995 Saving Configuration Options CAUTION Be extremely careful when savingconfiguration options to avoidsaving them to the wronglocation. To save edited configuration options: . Procedure 1. From any configuration option in any option set, press the ...

Configuring the Unit 5-5 3550-A2-GB20-10 February 1995 F1 Port 1 DSU 9.6 T Local Remot F2 F3 This example is now complete. Configuration Option Tables This section contains a table for each option set that can be found under the Configuration (Confg) branch, inthe order in which it appears in the me...

COMSPHERE 3550 Series Data Service Units 5-6 February 1995 3550-A2-GB20-10 Table 5-1 (1 of 2) DSU Configuration Options Rate(Kbps): 9.6Next 64L 56 38.4 19.2 9.6 4.8 2.4 Prev DSU Rate. Sets the data rate (in kbps) of the DSU, which must be set to match the speed of the digital (DDS) circuit. 64L — Se...

COMSPHERE 3550 Series Data Service Units 5-10 February 1995 3550-A2-GB20-10 Table 5-4 Diagnostic (External DBU) Configuration Options Diag Type: DisrNext Disr None Prev Diagnostic Type. This configuration option defines the diagnostic interaction between control and tributary DSUs that arein backup ...

Configuring the Unit 5-11 3550-A2-GB20-10 February 1995 Table 5-5 (2 of 2) Diagnostic (General) Configuration Options TribTimOut: 0:10Next Chang Prev Tributary Time-out, specified in minutes and seconds (only displayed when any Diag Type is set to NonD or Mixed,LinkConfig is set to M-Pt, and Full Mo...

COMSPHERE 3550 Series Data Service Units 5-12 February 1995 3550-A2-GB20-10 Table 5-6 (1 of 4) DBM Configuration Options Rate(Kbps): 9.6Next 14.4 12.0 9.6 4.8 2.4 Prev DBM Rate. Sets the initial data rate (in kbps) of the DBM for backup calls over the dial circuit. 14.4 to — Select the data rate for...

COMSPHERE 3550 Series Data Service Units 5-16 February 1995 3550-A2-GB20-10 Table 5-7 External DBU Configuration Options ExtBU: NoneNext Ansr Orig None Prev External Backup Unit. This feature allows dial backup for a DSU using an external dial backup unit (DBU). Ansr — Select for the external DBU to...

Configuring the Unit 5-17 3550-A2-GB20-10 February 1995 Table 5-8 (1 of 4) General Configuration Options DTE Port: EIA232Next EIA232 V.35 Prev DTE Port (not displayed when a TDM/Flex is installed and enabled). Selects the active DTE interface. EIA232 — Select when using the EIA-232 interface (connec...

Configuring the Unit 5-21 3550-A2-GB20-10 February 1995 Table 5-9 (1 of 2) Backup Configuration Options Auto Bckup:DisabNext Enab Disab Prev Automatic Backup (only displayed when a DBM is installed, or an external DBU is configured to originate backup).Controls automatic initiation of a call setup a...

Configuring the Unit 5-29 3550-A2-GB20-10 February 1995 Table 5-14 Port Speed (External DBU) Configuration Options Prt1( 9.6): 9.6Next 64 56 48 28.8 19.2 14.4 9.6 4.8 2.4 1.2 Disab Prev Port 1 Speed. Primary data rate in kbps on Port 1. (Must be set to the same value in the external DBU.) 64 to — Se...

A-1 3550-A2-GB20-10 February 1995 DSU Menu Overview A-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Menu Structure A-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

COMSPHERE 3550 Series Data Service Units A-4 February 1995 3550-A2-GB20-10 Continued from Page A-1 . Press a function key to select one of the following branches: • Local branch • Remote branch – Only available to a DSUconfigured as a control or a point-to-point tributary. • Messages branch – Only a...

B-1 3550-A2-GB20-10 February 1995 Configuration Worksheets Overview B-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instructions B-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

C-1 3550-A2-GB20-10 February 1995 Status Indicators and Control Panel Messages Overview C-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status Indicators C-1 . . . . . . . . . . . . . . . . . . . ...

Status Indicators and Control Panel Messages C-3 3550-A2-GB20-10 February 1995 Control Panel Messages This section shows the screen format of messages appearing on the control panel and describes the variousmessages. Three types of messages are included: health and status, progress, and error messag...

COMSPHERE 3550 Series Data Service Units C-6 February 1995 3550-A2-GB20-10 Table C-4 Expanded Health and Status Messages Message Condition Dial Attempt: nn The number ( nn) of failures of dialing attempts since failure of private-line service. This message is cleared when the automatic backup proces...

Status Indicators and Control Panel Messages C-7 3550-A2-GB20-10 February 1995 Table C-5 Subnetwork Health and Status Messages Message Condition Devic TDM/Flex only: Device Failure. One of the following major alarms is in effect: Configuration CorruptDevice Test FailureMUX Device Failure DialBU Dial...

COMSPHERE 3550 Series Data Service Units C-8 February 1995 3550-A2-GB20-10 Progress Messages Table C-6 describes the command progress messages, and Table C-7 describes the dial backup progressmessages. Table C-6 Command Progress Messages Message Condition Please wait . . . Command is taking more tha...

Status Indicators and Control Panel Messages C-9 3550-A2-GB20-10 February 1995 Error Messages Table C-8 describes the command error messages, Table C-9 describes the dial backup error messages, andTable C-10 describes the TDM/Flex error messages. Table C-8 Command Error Messages Message Condition Ac...

COMSPHERE 3550 Series Data Service Units C-10 February 1995 3550-A2-GB20-10 Table C-9 Dial Backup Error Messages Message Notify NMS 1 Condition Action DBM: Busy Yes Telephone line associated withremote DBM is busy. Try again. Try another number if possible,or investigate why the line is busy. DBM: C...

Status Indicators and Control Panel Messages C-11 3550-A2-GB20-10 February 1995 Table C-10 (1 of 3) TDM/Flex Error Messages Message Condition Action All Async >Aggr All ports of the TDM/Flex are configuredfor asynchronous operation and theircombined corresponding synchronousrate exceeds the value...

D-1 3550-A2-GB20-10 February 1995 Pin Assignments Overview D-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overview Pin assignments for the 3550 Series DSU connectors and interfaces are included h...

Pin Assignments D-7 3550-A2-GB20-10 February 1995 Table D-6 V.35 Connector Pin Assignments 25-Pin Connector (Rear Connector Plate) 34-Pin Connector (V.35 Interconnect Cable) Circuit Name Pin Number Pin Number 7 B Signal Ground 4 C Request-to-Send (RTS) 5 D Clear-to-Send (CTS) 6 E Data Set Ready (DSR...

E-1 3550-A2-GB20-10 February 1995 Application Configurations Overview E-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Point-to-Point Applications E-1 . . . . . . . . . . . . . . . . . . . . . . . ...

Application Configurations E-3 3550-A2-GB20-10 February 1995 Multipoint Applications Model 3550 and Model 3551 DSUs also provide high-speed multipoint circuit support. The network can becontrolled from the DSU’s control panel or a 6700 SeriesNMS. Figure E-2 shows sample multipointconfigurations. Usi...

F-1 3550-A2-GB20-10 February 1995 Equipment List Equipment Feature/Part No. G = Factory Install. F = Field Install. Comcode Model 3550 Standalone DSU With V.32 bis 14.4 kbps DBMWith 2-port TDM/Flex Model 3551 Carrier-Mounted DSU(includes rear connector plate) Without OptionsWith V.32 bis 14.4 kbps D...

Equipment List F-3 3550-A2-GB20-10 February 1995 Equipment* Part Number AT&T Paradyne Field Service Spares For Model 3550 DSU 2-Port TDM/Flex For Model 3551 DSU For Model 3550/3551 V.32 bis14.4 kbps DBM DBM Core Line-Interface 870-1858-8001870-1871-8001 870-1859-8001 102-0144-0031870-1571-8000 R...

Glossary-1 3550-A2-GB20-10 February 1995 Glossary active core The core that is transmitting data. For example, the DBM is the active core whenthe unit is in Backup mode. Advanced Diagnostic protocol(ADp) The network management protocol used by the COMSPHERE 6700 Series NMS. Itprovides diagnostic com...

Index-1 3550-A2-GB20-10 February 1995 Index A Abort selective, 4-9subnetwork, 4-9 Abort Call failure message, C-6AC power, requirements, 1-4Active message, DBM, C-3Addr, 4-18address, assigning, 4-18addressing, tributary DSU, 2-9, 3-10Aggreg Exceeded error message, C-11Alarm, 4-6All Async>Aggr err...