Page 1 AT&T 555-021-717 Issue 1, November 1989 Integrated Services Digital Network (ISDN) 7500B Data Module Feature Package 2 User’s Manual...
Page 2 TO ORDER COPIES OF THIS MANUAL Call: AT&T Customer Information Center on 800-432-6600 In Canada Call 800-255-1242 Write: AT&T Customer Information Center 2855 North Franklin Road P.O. Box 19901 Indianapolis, Indiana 46219 Order: Document No. 555-021-717 Issue 1, November 1989 While reasonable efforts were made to ensure that the information in this document was complete and accurate at the time of printing, AT&T can assume no responsibility for any errors.
Page 3: Important Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS When using your telephone equipment, basic safety precautions should always be followed to reduce the risk of fire, electric shock and injury to persons, including the following: Read and understand all instructions. Follow all warnings and instructions marked on the product. This product can be hazardous if immersed in water.
Page 4 Disconnect the cords on this product and refer servicing to qualified service personnel under the following conditions: A. When the power supply cord or plug is damaged or frayed. B. If liquid has been spilled into the product. C. If the product has been exposed to rain or water. D.
Page 5: Table Of Contents
User Manual Conventions and Product Standards Legend for Flowchart Figures On “System Administrator”: An Important Note to All Users 2: PRODUCT OVERVIEW Front Panel of the 7500 Rear Panel of the 7500 7500 Configurations and Features Features Common to All Configurations...
Page 6 Viewing Options, With Help Menu View Options With Help — Single Port Configuration View Options With Help — Dual Port Configuration Viewing Options, Without Help Menu Service Profile Identifier (SPID) 4: DEFINITIONS OF 7500 OPTIONS Answer Attention Autoadjust Autodial Break Busyout Char.erase (Character Erase)
Page 7 Asynchronous DCE With the Multipurpose Enhancement Board 6: ASYNCHRONOUS DTE CONFIGURATION Modem Pooling Applications Characteristics of Modems that can be Attached to the 7500 Overview of 7500 Operation 7500 Modem Pool: Digital to Analog Network 7500 Modem Pool: Analog to Digital Network...
Page 8 Stand-Alone High Speed Synchronous DCE Configuration 1 1 6 Installing NT1 or Terminating Resistor Adaptor 1 1 7 Installing the 7500 Data Module in a 77A Data Mounting 1 1 9 1 2 9 9: TECHNICAL INFORMATION 7500 — Asynchronous DCE...
Page 9 Pin 18/L - Local Loopback Pin 21/N - Remote Loopback Pin 25/NN - Test Mode 7500 — Automatic Calling Unit Interface Functional Description of Interchange Circuits Circuit SG - Signal Ground (CCITT 201) Circuit CRQ - Call Request (CCITT 202)
Page 10 View Options, Without Help Menu Figure 21: Going Between Local Mode and Data Mode During a Data Call Figure 22: The 7500 Used in a Modem Pooling Application Figure 23: Rear Panel of the 7500 1 0 4 Figure 24:...
Page 11 List of Tables Table A: Home Display Terms Table B: Asynchronous DCE and DTE Options With Help Table C: Synchronous DCE Options, With Help Table D: Asynchronous DCE and DTE Options, Without Help Table E: Synchronous DCE Options, Without Help Table F: Commands, Their Abbreviations and Descriptions Table G:...
Page 12: 1: Introduction
The AT&T ISDN 7500 Data Module is a terminal adaptor intended primarily for connecting unattended data terminal equipment (DTE) or data communications equipment (DCE) to the ISDN network. The 7500 is a stand alone unit which can be inserted into a multiple mounting (that is rack mounting). The 7500 has no voice functions.
Page 13: Organization Of The User's Manual
Items in bold characters, for example, 3784, represent information entered with the data terminal keyboard. Items in reverse video, for example, [ DONE? ] represent messages on the 7500 display or the terminal screen. Items in italics, for example HOME, represent variables.
Page 14: Legend For Flowchart Figures
An Example of a Flowchart Figure 2 shows a portion of a typical 7500 manual flowchart figure. Callouts (1), (3), and (5) represent messages displayed on the 7500's front panel. Messages are always pictured in boxes. Callouts (2), (4), and (6) represent the three button on the 7500's front panel: [...
Page 15: On "System Administrator": An Important Note To All Users
CHAPTER 1: INTRODUCTION On “System Administrator”: An Important Note to All Users Throughout this manual, we ask you to speak to your “system administrator.” To whom do we refer? In your company, it is the person who has been given the overall responsibility for ISDN — including all terminals as well as the switch.
Page 16: 2: Product Overview
Figure 3: The front panel has the following features: Power/Test lamp — The red Power/Test lamp lights when power is supplied to the 7500. The lamp flashes during all tests. Data lamp — The green Data lamp lights when a data call is in progress. The lamp flashes during self-test and when you are receiving an incoming data call that has not yet been answered.
Page 17: Rear Panel Of The 7500
AC power. Communications Ports 1 and 2 — Port 1 is used to connect the 7500 to a data terminal, computer, or modem. Depending upon which enhancement board is installed, Port 2 can be used to connect a second data terminal, an automatic calling equipment (RS-366 interface), or a data terminal equipment with a V.35 interface.
Page 18: 7500 Configurations And Features
The front panel menu system is the first method of operation described. If your 7500 is configured as an asynchronous DCE, and it is attached to a data terminal or personal computer, you will probably want to operate it from the keyboard of your attached terminal. This method of operation is described in CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION.
Page 19: Asynchronous Dte (Modem Pooling) Features
CHAPTER 2: PRODUCT OVERVIEW One of the following two optional enhancements: — RS-366 Automatic Calling Unit (ACU) interface. — Second asynchronous EIA-232D interface. (Two D-channel packet data calls — or one D- channel packet call and one B-channel circuit call — can operate simultaneously. Two B- channel circuit switched calls, however, cannot operate simultaneously.) Asynchronous DTE (Modem Pooling) Features EIA-232D interface.
Page 20: 3: Front Panel Feature Access
CHAPTER 3: FRONT PANEL FEATURE ACCESS Introduction The 7500 has a structured menu that you can use to exercise its features as shown in Figure 5. Note: The Call Control items appear only in synchronous circuit switched configurations. The Sync/Async items appear only in configurations supporting both modes.
Page 21: Main Menu
] button. ENTER/YES If you are using the 7500 as asynchronous DCE, you can do many of the same functions using the keyboard of your data terminal. The keyboard procedures are described in CHAPTER 5 of this manual. The menu consists of several menu levels that are described in this section. The main menu provides access to the categories of actions available on the 7500.
Page 22: Main Menu Items
CHAPTER 3: FRONT PANEL FEATURE ACCESS Main Menu Items The main menu consists of from six to eight items depending upon the hardware configuration (see Figure 6): (Home) Display Data Communications Port 1 or Port 1 and 2 EIA Lead Status Call Control (Synchronous Circuit Switched Modes only) Synchronous/Asynchronous Setup (Synchronous Multipurpose Enhancement Board option only)
Page 23: The Home Display
10. [ OOS ] (Out of Service ) means that the network has temporarily placed the 7500 in a maintenance mode. 11. [ RSTD ] (Restricted Service) means that there is no data call in progress and your 7500 has been programmed with an incorrect SPID. You will receive this indication of incorrect SPID only if you have subscribed to restricted service.
Page 24 DCE/DTE flipboard (see CHAPTER 8 ). An example of a display message using a status term is: [ ASYNC DCE DATA ] indicating that the 7500 is configured as asynchronous data communications equipment and a data call is in progress.
Page 25: Eia Data Communication Port Status Display
NEXT/NO item in the main menu. The display on the 7500 will look something like the EIA Status display that is depicted in Figure 7. The abbreviated names of the leads appear above the display. Typical EIA Status Display (Dual Port Async DCE Configuration)
Page 26: Synchronous Call Control Menu
When you enter the Call Control menu, the choices you will be given depend on the current status of your 7500. If you have no call in progress, your choices will be to dial a number or to store a number.
Page 27: Figure 8: Synchronous Call Control Menu
CHAPTER 3: FRONT PANEL FEATURE ACCESS — refers to instructions to Dial an Unstored Number. — refers to instructions to Store Numbers in Memory. * (Home) in this figure refers to one of the messages described in Table A. Synchronous Call Control Menu Figure 8:...
Page 28: To Dial An Unstored Number
CHAPTER 3: FRONT PANEL FEATURE ACCESS All procedures outlined below begin from the (Home) display. If you are not at the (Home) display, press [ ] and [ ] together to return (Home). NEXT/NO BACK To Dial an Unstored Number In this example, the number to be dialed is 5551212.
Page 29: To Correct An Error
ENTER/YES To Store Numbers in Memory [ STORE NUMBER? ] is an item in the Call Control menu. The 7500 allows you to store up to three 15-digit telephone numbers (labeled m1, m2, and m3). When you first enter the [ Store Number? ] menu, the system displays [ M1: ] and the stored number, if any.
Page 30: To End A Data Call
To End a Data Call The 7500 displays [ END CALL ? ] (in the Call Control Menu) only when you have a call in progress. The following steps show how to end a data call from the front panel of the 7500.
Page 31: Synchronous/Asynchronous Menu
Multipurpose Enhancement Board. The system bypasses this menu when the Multipurpose Enhancement Board is not installed. The Sync/Async menu is used to change the operation of the 7500 from synchronous to asynchronous and back again. What appears on the display depends on how the option is currently set.
Page 32: Figure 9: Synchronous/Asynchronous Menu
CHAPTER 3: FRONT PANEL FEATURE ACCESS Figure 9 shows in diagram form what is displayed when changing from synchronous to asynchronous and vice versa. CHANGING FROM SYNC TO ASYNC CHANGING FROM ASYNC TO SYNC * (Home) in this figure refers to one of the messages described in Table A. Figure 9: Synchronous/Asynchronous Menu...
Page 33: Test-Reset Menu
CHAPTER 3: FRONT PANEL FEATURE ACCESS Test-Reset Menu Introduction The Test-Reset menu is used to run any of the following four tests or to reset the options to their factory values: Self-test Local loopback test for Port 1 (and for Port 2 if installed) Remote loopback test for Port 1 (and for Port 2 if installed) Remote loopback self-test (asynchronous only) for Port 1 (and for Port 2 if installed) Figure 10 shows the Test-Reset menu layout.
Page 34 CHAPTER 3: FRONT PANEL FEATURE ACCESS Self-Test Self-test checks the functionality of the 7500’s hardware and software. To Run Self-Test Starting from the (Home) display, press [ TEST-RESET? ] is displayed. ] until [ TEST-REST? ] is NEXT/NO displayed. [ SELFTEST? ]...
Page 35: Local Loopback Test
(between the data terminal and the 7500). When the local loopback test is initiated, data travels from the data teminal to the 7500, where it is looped back to the data terminal. You can do local loopback tests when the set is idle or when it is engaged in a data call.
Page 36 To Run Remote Loopback Test for High Speed Synchronous Configurations These instructions apply to 48, 56, and 64 kbps synchronous. To perform this test, you must start the test before making the call. Once you have selected Remote Loopback, the 7500 will prompt you with the Dial menu.
Page 37: Remote Loopback Self-Test (Asynchronous Only)
CHAPTER 3: FRONT PANEL FEATURE ACCESS Remote Loopback Self-Test (Asynchronous Only) To Run Remote Loopback Self-Test (Asynchronous Only) This remote loopback test has an internal data generator/checker. To perform this test, you must have established a data call before you initiate the test. Attempting to run a Remote Loopback Self-Test without a data call will return you to the (Home) display.
Page 38: Figure 11: Reset Options Menu, Single Port Configuration
CHAPTER 3: FRONT PANEL FEATURE ACCESS 4. Press [ [ OPTIONS RESET ] is displayed briefly followed ] to reset all options to ENTER/YES by the (Home) display. their factory values [ EXIT? ] is displayed. press [ ]. Press [ ] to NEXT/NO ENTER/YES...
Page 39: Figure 12: Reset Options Menu, Dual Port Configuration
CHAPTER 3: FRONT PANEL FEATURE ACCESS Dual Port Configuration The procedure below describes how to reset options to their factory values when the Second Asynchronous Enhancement Board is installed. Press [ ] from the (Home) [ TEST-RESET? ] is displayed. NEXT/NO display until [ TEST-RESET? ] displayed.
Page 40: Setting Options
CHAPTER 3: FRONT PANEL FEATURE ACCESS Setting Options Introduction This section describes how to set your data options from the front panel of the 7500. There are two menu systems for setting your options (see Figure 13). The With Help Menu...
Page 41: Setting Options With Help Menu
CHAPTER 3: FRONT PANEL FEATURE ACCESS Setting Options With Help Menu Figure 14 shows the operation of the Set Options With Help menu. The option and its value are separated by an equals sign (=) when the display shows the current value; the option and its value are separated by a right arrow (→) when it shows a possible alternative value.
Page 42: Figure 14: Set Options, With Help Menu, Dual Port Configuration
CHAPTER 3: FRONT PANEL FEATURE ACCESS Set Options, With Help Menu, Dual Port Configuration Figure 14:...
Page 43: Setting Options With Help Menu - Using Attention As Example
CHAPTER 3: FRONT PANEL FEATURE ACCESS Setting Options With Help Menu — Using Attention as Example Figure 15 shows how to set one option via the With Help Menu, using the Attention option as an example. 1. Press [ ] from the (Home) [ SET OPTIONS? ] NEXT/NO is displayed.
Page 44: Figure 15: Setting An Option Via The With Help Menu, Using The Attention Option As An Example
CHAPTER 3: FRONT PANEL FEATURE ACCESS * (Home) in this figure refers to one of the messages described in Table A. Figure 15: Setting an Option Via the With Help Menu, Using the Attention Option as an Example...
Page 45: Saving And Canceling Options, With Help
CHAPTER 3: FRONT PANEL FEATURE ACCESS Saving and Canceling Options, With Help 1. After making any changes you want, [ DONE? ] is displayed. press [ ] when [ CONTINUE? ] is NEXT/NO displayed. 2 . Press [ [ SAVE CHANGES ] is displayed. ENTER/YES [ CHANGES SAVED ] is displayed briefly 3.
Page 46: Asynchronous And Synchronous Option Tables
CHAPTER 3: FRONT PANEL FEATURE ACCESS Asynchronous and Synchronous Option Tables The following tables list the options in the order they are presented in the menu, indicating the option name, how the option is displayed on the front panel, and its values. Table B lists asynchronous options;...
Page 47 CHAPTER 3: FRONT PANEL FEATURE ACCESS Asynchronous DCE and DTE Options, With Help (Cont) Table B: Abbreviated Possible Values * Set Options Display Options Name Option Name MATCHSPD ON, OFF Match.speed (DCE) SET MATCH SPEED? ON, OFF MATCHSPD Match.speed (DTE) SET MATCH SPEED? MIN TIMER ON, OFF...
Page 48: Setting Options, Without Help Menu
Sync Board) Setting Options, Without Help Menu If the 7500 is configured for only one port (i.e., no Second Asynchronous Enhancement Board is installed), follow the instructions in the next section, Setting Options Without Help Menu Using Speed as an Example to set your options.
Page 49 (Home) display. [ CANCEL CHANGES? ] is displayed. Tables with the values for all options (Tables D and E) appear on the next two pages. The definitions of the options are in the CHAPTER 4: DEFINITIONS OF 7500 OPTIONS.
Page 50 CHAPTER 3: FRONT PANEL FEATURE ACCESS * (Home) in this figure refers to one of the messages in Table A. Figure 16: Set Options, Without Help Menu...
Page 51: Asynchronous And Synchronous Option Tables
All of the possible option settings for each display position are shown in the next two tables. A detailed description of each option is included in CHAPTER 4: DEFINITIONS OF 7500 OPTIONS. Table D lists asynchronous options; Table E lists synchronous.
Page 52 CHAPTER 3: FRONT PANEL FEATURE ACCESS Synchronous DCE Options, Without Help Table E: Possible Values††† Display Option Position Blank BXRemote BXLocal NailB2 NailB1 Mode 19.k 9.6k 4.8k 2.4k 1.2k Speed† Speed†† Full Half Duplex Data.rest Autodial Follow Ignore Busyout Blank Blank Blank Blank...
Page 53: Saving And Cancelling Options, Without Help
CHAPTER 3: FRONT PANEL FEATURE ACCESS Saving and Canceling Options, Without Help After making any changes you want, For example: press [ ] until the cursor is [ L1:B350110000011 ] ENTER/YES under L1 or L2. [ DONE? ] is displayed. Press [ ] once or twice until NEXT/NO...
Page 54 CHAPTER 3: FRONT PANEL FEATURE ACCESS Asynchronous DCE Factory Options FCPN DCD Echo Match Auto List Setup Mode Speed Parity Busy Answr Mode Text Attention Idle Timer List Edit Char Line Break Timer Erase Erase Flow Flow Asynchronous DTE Factory Options Setup Mode Speed Parity FCPN DCD List...
Page 55: Viewing Options 4
7500s. If your 7500 is set up as asynchronous DCE, you may use the keyboard of an attached data terminal to view your options. See CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION for procedures on viewing options.
Page 56: Viewing Options, With Help Menu 4
CHAPTER 3: FRONT PANEL FEATURE ACCESS Viewing Options, With Help Menu Figure 18 illustrates the With Help Menu for viewing the option values currently in effect. You can only view the options from this menu; you cannot change any of them. Each option and its value are displayed in the same order as they are shown in Tables B and C.
Page 57: View Options With Help - Dual Port Configuration 4
CHAPTER 3: FRONT PANEL FEATURE ACCESS View Options With Help — Dual Port Configuration Press [ ] from the (Home) [ VIEW OPTIONS? ] is displayed. NEXT/NO display until [ VIEW OPTIONS? ] is displayed. Press [ [ WITH HELP? ] is displayed. ENTER/YES Press [ [ PORT 1 OPTIONS? ] is displayed.
Page 58: Viewing Options, Without Help Menu 4
CHAPTER 3: FRONT PANEL FEATURE ACCESS Viewing Options, Without Help Menu If the 7500 is configured for only one port (i.e., no Second Asynchronous Enhancement Board installed), follow the instructions below. If you have a Second Asynchronous Enhancement Board installed, the option named Setup determines which port’s options are viewed when using the Without Help menu.
Page 59 CHAPTER 3: FRONT PANEL FEATURE ACCESS * (Home) in this figure refers to one of the messages in Table A. View Options, Without Help Menu Figure 20:...
Page 60: Service Profile Identifier (Spid) 4
Changing the value could result in loss of service. The following steps show how, from the front panel of the 7500, to store the SPID you have been given by your system administrator. The steps shown are from the (Home) display. If you are not at the...
Page 61 CHAPTER 3: FRONT PANEL FEATURE ACCESS...
Page 62: 4: Definitions Of 7500 Options 5
Data Protocols: X.25, Mode 2, Mode 3 The Attention sequence is used to take the 7500 out of Data Mode and enables you to get the [ CMD: ] prompt. The default setting is +++. You must always type the sequence rapidly (all three characters within 1.5 seconds).
Page 63: Autoadjust 5
Configurations: Asynchronous DCE, Asynchronous DTE Data Protocols: X.25, Mode 2, Mode 3 If Autoadjust is on, the 7500 automatically adjusts to the Speed and Parity of your attached data terminal when you press [ ], then type AT. Pressing [...
Page 64: Autodial 5
“m1” without the use of an RS-366 autodialer. When the Autodial option is set to 1 (on) and no data call is in progress, the 7500 automatically initiates a data call to the number stored in "m1" when the attached synchronous device turns on its DTR lead.
Page 65: Busyout 5
This option provides a method for taking 7500’s out of service temporarily. When this option is set to on, you can make the 7500 appear “busy” to some networks* during a local loopback test. When set to off, local loopback testing will not cause the set to appear “busy” to the network.
Page 66: Char.erase (Character Erase) 5
If you select a restricted channel (Data.rest on), the 7500 does not enforce the data restriction i.e., it will not check your data to ensure that you do not send more than seven contiguous zero bits.
Page 67: Dcd (Data Carrier Detect)
When the DCD lead is set to ignore, it appears to your terminal that a data call is always present, except for one second following termination of a call. This will enable your data terminal to transmit commands to the 7500 even when a data call is not present. This setting is appropriate for most users.
Page 68: Dtr (Data Terminal Ready) 5
The DTR option determines how the 7500 will respond to the presence or absence of this electrical signal. The DTR lead is used by your data terminal to indicate to the 7500 that it is ready for communications. Many data terminals turn the DTR lead on whenever the data terminal is turned on.
Page 69: Duplex 5
If you select off, the 7500 will not echo characters sent during the Data Mode. Thus, if your host computer or other data endpoint echoes characters for you, select off. Otherwise, each character you type will be displayed twice.
Page 70: Edit 5
CHAPTER 4: DEFINITIONS OF 7500 OPTIONS Edit Configurations: Asynchronous DCE, Asynchronous DTE Data Protocols: X.25, Mode 3 This option is used with the Forwarding option and allows you to correct characters and lines of text before sending out packets. Select on if you want to be able to edit packets before you send them; select off otherwise. Note that Forwarding must be set to something other than off for Edit to work.
Page 71: Forwarding 6
Set Forwarding to something other than off if you want a way to signal the 7500 to send a less- than-full data packet. For example, if you set Forwarding to carriage return, the characters that you...
Page 72: Idle.timer 6
Data Protocols: X.25, Mode 3 When the Data Mode is set to X.25 or Mode 3, the 7500 sends data through the network in packets. Idle.timer determines how long the 7500 waits after receiving a character from the data terminal before it sends out a packet which is not full.
Page 73: Local Mode 6
When this option is set to cmd, you will be able to perform most of the front panel functions by typing commands on a terminal attached to the 7500. This is the correct setting for most users who will be attaching the 7500 configured as Asynchronous DCE, to a data terminal or personal computer.
Page 74: Min.timer (Minimum Delay Timer) 6
CHAPTER 4: DEFINITIONS OF 7500 OPTIONS The terminal adaptor connected to the higher-speed endpoint buffers the data and meters it toward the network at the rate of the lower-speed endpoint. This terminal adaptor also controls the data flow from the attached equipment using the Trans.flow control mechanism. If Trans.flow is off or if the attached terminal does not support Flow Control, then you cannot transmit data faster than the rate of the lower-speed endpoint.
Page 75: Asynchronous Dce 6
Configurations: Asynchronous DCE, Asynchronous DTE, Synchronous DCE Asynchronous DCE Mode selects the preferred data protocol your 7500 will use to originate a data call. This option only refers to data call origination. Incoming calls, in contrast, are always answered with the data protocol specified by the caller.
Page 76: Synchronous Dce 6
CHAPTER 4: DEFINITIONS OF 7500 OPTIONS Asynchronous DCE and Asynchronous DTE Option Values For Mode Factory Value Front Panel Mode Without Help With Help DX25 Synchronous DCE The following description should guide you in selecting the one option value that is the appropriate one for your application.
Page 77: Parity 6
When you select xon/xoff, your data terminal sends the 7500 an xoff character when it is not ready to receive data. When it is ready to receive data, it sends an xon character to the 7500 to restart the flow of data. This setting is appropriate for most users.
Page 78: Setup 6
EIA speed leads (pins 12 and 13). If set to 1, the 7500 will ignore the leads and remain the speed to which it’s set. If set to 2, the 7500 will support 2-speed modems and will drop to the lower speed on request. If the option is set to 3, the...
Page 79: Speed 6
Use this option to change the speed at which data communications take place. To set this option from an asynchronous attached terminal, do the following: 1 . Type set speed value (for example, set speed 9600) to tell the 7500 the speed at which you want to communicate.
Page 80: Text 6
When you select xon/xoff, the 7500 sends your data terminal an xoff character when it is not ready to receive data. The 7500 sends an xon character to your data terminal when it is ready to receive data. This setting is appropriate for most users.
Page 81: Zca (Zero Called Address) 7
CHAPTER 4: DEFINITIONS OF 7500 OPTIONS Select eia, if you want the 7500 to use the Clear-to-Send (CTS) lead to indicate whether it is ready to receive data from your data terminal. When it is not ready to receive data from your terminal, the 7500 turns off CTS.
Page 82: 5: Asynchronous Dce Configuration 7
Feature Access From an Attached Data Terminal This chapter explains how to use a data terminal attached to your 7500, preparing the terminal for data operations and making data calls. How to set up and program your 7500 to suit your particular needs is also described.
Page 83: Automatic Speed And Parity Adjustment 7
The 7500 data module can automatically adjust to the Speed and Parity of your data terminal. If you are not sure the 7500 and your data terminal are operating at the same speed, or if you need to change your 7500’s Speed or Parity, follow the procedure below.
Page 84: Making A Data Call 7
], type AT, and press [ BREAK RETURN to make certain that Speed and Parity are correct. The 7500 will automatically adjust Speed and Parity. 3 . At the [ CMD: ] prompt, type dial and the telephone number. For example, type dial 1234567.
Page 85 1. Rapidly type the Attention sequence: +++ (See the To end a data call description of the Attention option in CHAPTER 4: DEFINITION OF 7500 OPTIONS.) The [ CMD: ] prompt displayed. 2 . Type end to end the call...
Page 86: Other Ways Of Dialing From Your Attached Data Terminal 7
CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION Other Ways of Dialing From Your Attached Data Terminal Other ways of dialing from your attached data terminal are summarized below. The elements of such calls are explained later in this manual. Redialing the Last Data Call Made At the [ CMD: ] prompt, type redial and press [ ] to redial the last data call made.
Page 87: Memory Dialing 7
CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION The 7500 will reject incoming X.25 calls that use any of the following facilities: On-line facility registration Extended packet sequence numbering Packet retransmission Nonstandard default packet sizes Nonstandard default window sizes Incoming calls barred within a closed user group...
Page 88: Default Or Hot Line Dialing 7
[ Current value = unspecified ] [ Type new value (or Q to quit): ] Type the value for that option (for example, 5551212). The 7500 will respond by displaying a table of all values for this memory location and will prompt again: [ Type option name (or Q to quit: ] Type in the next option name for which you want to assign a value and repeat step 3.
Page 89: Suspending And Continuing Data Transmission During A Data Call 7
Rapidly type the Attention sequence: +++. You will see the [ CMD: ] prompt on your screen. This means that data transmission has been suspended; you can now issue commands to the 7500, using the commands explained later in this chapter.
Page 90: Commands 7
Local Mode. When in Local Mode you are not transmitting data, and your 7500 is interpreting and acting upon the instructions that you type. Your 7500 is in Local Mode when your data terminal displays the [ CMD: ] (command) prompt.
Page 91: Abbreviating Commands
Each profile that you use is composed of options that control the operation of the 7500. The following is a list of the options that determine how the 7500 will operate. The possible values for each option are listed opposite each option. In most cases, the factory options (printed in bold) will allow for successful data communications.
Page 92: Types Of Data Option Profiles
1 (p1, the power up profile); profile 2 (p2); active profile (pA); and the factory profile (p0). The very first time a 7500 is powered up, p1 and p2 will be the same as p0.
Page 93: Creating (Programming) A Data Option Profile
Creating (Programming) a Data Option Profile It is possible to program two option profiles. The 7500 calls these profile 1 (p1), and profile 2 (p2). Profile 1 (p1) is automatically loaded after your set starts up again after losing power. The values of p1 should be set to your most frequently used settings.
Page 94 CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION The 7500 will display the current value and the possible values for that option and prompt: [ Type new value (or Q to quit): ] 3 . Type the new value (for example, auto) and press [ ] when you are finished.
Page 95: Setting Options: Changing Your Active Profile, Pa
CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION Setting Options: Changing Your Active Profile, pA To change the option values in the active profile (pA), use the set command. The program command can not be used to change options in pA. To change an option value in pA, at the [ CMD: ] prompt type: set option to value For example: set echo to on...
Page 96: Activating A Stored Profile
To activate a stored profile, type the following command at the [ CMD: ] prompt: copy profile to pA For example, to activate p1, type: copy p1 to pA The 7500 will activate the profile requested and respond: [ pA updated ]. See NOTE below. Replacing One Stored Profile With Another To replace one stored profile with another, type copy replacement profile to replaced profile.
Page 97: Viewing An Option Profile
Fourth, change the Forwarding option from off to the desired value; typically this should be cr. Make sure that the 7500’s Echo option is set to on and the data terminal’s echo option is set to off.
Page 98: Worksheet - Option Profile Settings
CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION Worksheet — Option Profile Settings Complete the following worksheet to record your desired option profile settings for p1 and p2. Information entered in this worksheet will help you when you are programming an option profile. Worksheet: Your Option Profile Settings p2 Value p1 Value...
Page 99: Getting Help
CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION Getting Help You can ask for help any time that you have a [ CMD: ] prompt on the screen. When you type help, the system displays the following screen: CMD: HELP Type HELP and the topic you want to learn more about. Examples: help test, h attention help...
Page 100: Testing Your 7500 Data Module
(between the data terminal and the 7500). When the local loopback test is initiated, data travels from the data terminal to the 7500, where it is looped back to the data terminal. You can do local loopback tests when the set is idle (local-idle mode) or when it is engaged in a data call (local-data mode).
Page 101: Remote Loopback Test
When you initiate a remote loopback test, data is transmitted from the data terminal, through your 7500 and the network to the data module at the far-end, where it is looped back to your 7500. A data call must be established before you initiate a remote loopback test.
Page 102: At Mode Operation
To switch to the AT local mode from the CMD local mode: At the [ CMD: ] prompt, type &&h The 7500 will respond: [ AT COMMAND MODE ] The AT Mode does not provide a prompt. It acknowledges most commands with “OK”. Commands used with the CMD local mode will not be recognized in the AT mode.
Page 103: At Commands
CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION AT Commands The AT mode is included in the 7500 primarily to support commonly used communication packages operating on PCs. The following table shows the commands which the AT mode supports. Note: in some cases, you may have to set compatible options for your particular communications package in command mode before entering AT mode.
Page 104 CHAPTER 5: ASYNCHRONOUS DCE CONFIGURATION In addition, the S-registers provide a means of changing or reading selected 7500 options. To select a particular S-register, type atsm, and [ ] (where the value of "m" is the register RETURN you want). Until another register is specified, the value of S-register “m” can be read by typing at? ].
Page 105: Dual Port Dce Operation
Dual Port DCE Operation If your 7500 has a second asynchronous board, you may attach two data terminals or other devices to it. This enables two users to place data calls at the same time. There are, however, some restrictions on this capability: Only DX25 mode can be run on both ports simultaneously.
Page 106: 6: Asynchronous Dte Configuration
A description of the typical user’s interaction with the 7500 is also included. The most common application for the 7500 in the DTE configuration is in a modem pool. In this application, the 7500 serves as an interface between the digital network and the analog network. As the system diagram (Figure 22) illustrates, the 7500 receives the digital data, either circuit or packet switched, and sends it across an EIA interface to a modem.
Page 107: Characteristics Of Modems That Can Be Attached To The 7500
Should support EIA signals CI and CI2 if the modem is multispeed modem. Overview of 7500 Operation In this application, users from both sides of the network will call through the 7500 in a modem pool. A method for controlling option settings from the analog network side is provided. The user on the digital side cannot change option settings.
Page 108: 7500 Modem Pool: Analog To Digital Network
X.25 packet data call (Zero Called Address option is on). The network automatically routes the call. Otherwise, the 7500 sends a [ CMD: ] prompt to the user on the analog side. The user must then type dial and the dialed number of the endpoint.
Page 109: Asynchronous Dte Data Options
CMD and Front Panel columns indicate the method for setting each option. “CMD” indicates that you can type commands on the keyboard of an attached data terminal; "Front Panel" indicates you can use the 3 buttons and the LCD on the 7500. DTE Options...
Page 110: Using Commands
CONFIGURATION. Several differences exist between the DCE and DTE operation. They are: Only the remote user who calls into the 7500 from the analog network can use the commands. For the 5ESS switch X.25 packet data modem pooling and digital to analog only circuit switched modem pools, it is recommended that Local Mode be set to off.
Page 111 CHAPTER 6: ASYNCHRONOUS DTE CONFIGURATION...
Page 112: 7: Synchronous Dce Configuration
The 7500 in the synchronous configuration is used for synchronous data transfer. In synchronous operation, all options are set from the front panel on the 7500. The 7500 can also originate data calls, answer incoming data calls, and disconnect data calls from the front panel.
Page 113 CHAPTER 7: SYNCHRONOUS DCE CONFIGURATION...
Page 114: 8: Installing The 7500
In this chapter, instructions for stand-alone installations are provided. For these installations, you will need different pieces of equipment depending on the configuration of your 7500 and of your network. A complete list is provided below. Asterisked (*) items are required for all installations.
Page 115: Stand-Alone Single Port Asynchronous Dce Configuration
1 . Remove the 7500 from the box. 2. Connect the telephone line cord to the jack labeled LINE. 3. Orient the power supply plug properly, then connect the cord to the 7500 into the connector labeled POWER. Figure 23: Rear Panel of the 7500 4 .
Page 116: Stand-Alone Dual Port Asynchronous Dce Configuration
This configuration consists of the basic 7500 plus the Second Asynchronous Interface Enhancement Board. 1 . Remove the 7500 from its box. For installed set, disconnect power cord. 2. Remove the Second Asynchronous Interface enhancement board from its box. 3. Open the door on the 7500.
Page 117 4. Remove the knock-out from the Port 2 slot. In the middle of the 7500’s rear panel, the slot for the Port 2 connector is marked off. Holding the marked area in one hand and the rest of the rear panel in the other, gently push the two pieces in opposite directions until the knock-out separates from the rear panel.
Page 118 CHAPTER 8: INSTALLING THE 7500 5 . Install the Second Asynchronous Interface enhancement board. Holding the board with the EIA-232D connector pointed toward the back of the set and the component side down, position the board over the open area of the set.
Page 119 CHAPTER 8: INSTALLING THE 7500 The vertical connector on the board should now be centered over its receptacle located in front of the firmware board already installed in the 7500. Top View Figure 27:...
Page 120 CHAPTER 8: INSTALLING THE 7500 Push gently but firmly on the board until it is firmly in place, and the edges of the board rest on the notches in the housing. Figure 28: Top View with Second Asynchronous Interface Enhancement Board Installed 6 .
Page 121 CHAPTER 8: INSTALLING THE 7500 8. Connect the telephone line cord to the jack labeled LINE. 9. Orient the power supply plug properly, then connect the cord to the 7500 into the connector labeled POWER. Connect the male end of the EIA-232D cable to the connector labeled Port 1.
Page 122 1 . Remove the 7500 from the box. For installed set, disconnect power cord. 2 . Open the door on the 7500. First, insert a pen into the small hole located near the LINE label. on the set’s back panel.
Page 123 CHAPTER 8: INSTALLING THE 7500 3 . Looking straight down at the inside of the 7500, locate the large silver arrow pointing toward the back of the set. This arrow points to the DCE/DTE flip board. (The flip board is perpendicular to the plane of the arrow.)
Page 124 4. Look at the DCE/DTE Flip board from the front of the set. Either DTE or DCE will appear in the left hand corner of the board. Make sure you are looking at the board from the front of the set. The arrow should be on the left. 7500 Showing Location of the DCE/DTE Flipboard Figure 32:...
Page 125 CHAPTER 8: INSTALLING THE 7500 5. If the arrow points to DTE, then the 7500 is configured as a DTE. Proceed to Step 7. 6. If the arrow points to DCE, you must reposition the board. Grasp the board firmly with both hands.
Page 126 CHAPTER 8: INSTALLING THE 7500 Turn the board around until DTE is facing the arrow. Replace the board into its slot. Reversing the DCE/DTE Flipboard Figure 34:...
Page 127 Connect the male end of the EIA-232D cable to the connector labeled Port 1. Connect the other end of the EIA-232D cable to your modem. Plug the power cord into an AC power outlet. The 7500 will automatically run a self test. For new sets, enter SPID and perform a self-test.
Page 128 Installing NT1 or Terminating Resistor Adaptor The next two figures depict different configurations depending on what equipment is centrally located. “Centrally located” devices are located in a place other than where the 7500 is being installed and therefore are not included in each figure.
Page 129: Figure 36: Installation Using A Power Supply And An Nt1
CHAPTER 8: INSTALLING THE 7500 Use the following configuration when nothing is provided in a central location. Installation Using a Power Supply and an NT1 Figure 36: Use the following configuration when both the NT1 and the terminating resistor are provided in a central location.
Page 130 CHAPTER 8: INSTALLING THE 7500 Installing the 7500 Data Module in a 77A Data Mounting In this section, we explain how to install one or more data modules in an empty, unpowered — or partially filled, powered — 77A Data Mounting. The mounting comes from the factory with the power supply and DC power distribution cable installed.
Page 131: Figure 39: Data Module With Display End
CHAPTER 8: INSTALLING THE 7500 Data Module With Display End Up Figure 39: 4. Position the retaining bar against the rack and push the left and right plungers in to secure the data modules in the rack. 5. Go to the back of the rack. All cables must be connected from the back of the rack.
Page 132 CHAPTER 8: INSTALLING THE 7500 (Skip steps 7 and 8 if adding modules to an existing installation and the data mount already has power.) 7 . Plug the AC power cord into the back of the power supply already mounted into the cabinet.
Page 133 CHAPTER 8: INSTALLING THE 7500 9. The data modules connect to the digital lines in one of the two ways: Using WP90780 L3 (NT1) or WP90780 L4 (UWP) adapter Using individual D8W line cords. 10. If you are using an L3 or L4 adapter to connect the modules to the digital lines, plug the adapter into the 25-pair cable coming from the switch.
Page 134 CHAPTER 8: INSTALLING THE 7500 11. If terminating resistor adapters (TRAs) are required for your installation, do this step; otherwise, do step 12 below. If you are using the L3 or L4 adapter to connect the modules with the digital lines, plug one end of the TRA into the jack on the data module marked LINE.
Page 135 CHAPTER 8: INSTALLING THE 7500 12. If you are not using terminating resistor adapters (TRAs), do the following: If you are using the L3 or L4 adapter to connect the modules with the digital lines, connect the numbered loose ends of the adapter to the LINE jacks on the corresponding data modules.
Page 136 CHAPTER 8: INSTALLING THE 7500 14. Drape each interface cable through its plastic twist lock and twist the top ends of the lock to secure each cable. The loose ends of the interface cables go out the back of the cabinet.
Page 137: Table L: Wp90780 L3 25-Pair Cable Adapter For Use With Direct Cabling To Multiple Mount Nt1
CHAPTER 8: INSTALLING THE 7500 Table L: WP90780 L3 25-Pair Cable Adapter for use with Direct Cabling to Multiple Mount NT1 Transmission Adapter Direction Modular N=Network Plug Number T=Terminal 7500 N->T N->T T->N T->N N->T N->T T->N T->N N->T N->T T->N...
Page 138: Table M: Wp90780 L4 25-Pair Cable Adapter For Use With At&T Uniform Wiring Plan
CHAPTER 8: INSTALLING THE 7500 Table M: WP90780 L4 25-Pair Cable Adapter for use with AT&T Uniform Wiring Plan Transmission Adapter Direction Modular N=Network Plug Number T=Terminal 7500 N - > T N - > T T - > N T - >...
Page 139 CHAPTER 8: INSTALLING THE 7500...
Page 140: Table N: Asynchronous Dce Pin Assignments
The 7500 generally ignore parity in Local Mode and transports it transparently in Data Mode. (The exceptions are: 1) the 7500 is always sensitive to the parity of the xon/xoff characters; and 2) the 7500 always ignores the parity of the Attention sequence characters and the Forwarding characters.) The 7500 supports only ASCII-formatted data in the Local Mode.
Page 141 Pin 3 - Received Data (BB) Signals on this lead are generated by the 7500 in response to data received from the remote data equipment or to user commands from the attached data terminal. This lead is held in the MARK state when Received Line Signal Detect is OFF except for user testing and during Local Mode.
Page 142 This lead allows the attached data terminal to control the 7500’s connection to the network. When the DTR option is set to follow, the 7500 requires an ON condition of Pin 20 to interact with the attached terminal or to initiate or maintain a data connection or test sequence (except the local self-test).
Page 143: Table O: Asynchronous Dte Pin Assignments
Test Mode Pin 2 - Transmitted Data (BA) Signals on this lead are transmitted by the 7500 to the attached modem. This lead is held in the MARK state (logic level 1) when data is not being transmitted. In the Data Mode, data transmitted to the modem will consist of one start bit, eight information bits and one stop bit.
Page 144 7500 interface is prepared to transmit data. If the Rec.flow option has been set to eia, an ON indicates that the 7500 is ready to receive data from the attached modem. An OFF indicates that it is not ready to receive data.
Page 145: Table P: Speed Mode Indicator
The 7500 checks for the presence of Data Set Ready, Clear-to-Send, or Receive Line Signal Detect, for a timeout period of 15 seconds. If the 7500 detects one of these leads as ON within a 15-second time period, the analog call is connected. If the ZCA option is ON, the 7500 generates a Call Request Packet to the network.
Page 146: Table Q: Synchronous Dce Pin Assignments
366 ACU interface connector on port 2 for automatic calling. When the High Speed Synchronous Enhancement Board is installed with its adapter cable connected to port 2, the 7500 provides a female 34-pin V.35 DCE interface for synchronous data communication. In this configuration, the 25-pin female interface at port 1 is not functional.
Page 147: V.35 Adapter Cable
The ON state of this circuit indicates that the DTE is prepared to transmit data. Pin 5/D - Ready for Sending The Ready for Sending circuit is controlled by the 7500 to indicate when data can be received from the DTE. The Ready for Sending circuit operates as follows: The OFF to ON transition of the Ready for Sending circuit follows the OFF to ON transition of the Request to Send circuit by a fixed time delay in the range of 17 to 80 msec.
Page 148: Pins 15/Y And 15/Aa - Transmitter Signal Element Timing
Pin 20/H - Data Terminal Ready An ON signal from the attached DTE indicates to the 7500 that the DTE is ready to be connected to the network. An OFF condition for more than 50 msec during data call setup, while in the data transfer...
Page 149: Pin 22/J - Ring Indicator
Pin 22/J - Ring Indicator A pulsed signal appears on this circuit when the 7500 receives an incoming data call. This signal is maintained until the 7500 answers or clears the call, or until the network clears the call attempt. The cadence is designed to simulate ringing: 2 seconds on, and 4 seconds off.
Page 150: 7500 - Automatic Calling Unit Interface
CHAPTER 9: TECHNICAL INFORMATION 7500 — Automatic Calling Unit Interface The multipurpose enhancement option board provides an RS-366 Automatic Calling Unit (ACU) interface. The RS-366 ACU interface collects digits until the End of Number (EON) digit is received or until the expiry of a 3-second inter-digit idle timer.
Page 151: Functional Description Of Interchange Circuits
Circuit CRQ - Call Request (CCITT 202) Direction: TO 7500 The ON condition of this circuit indicates a request to originate a call. The call is aborted if the 7500 detects the OFF condition on Circuit CRQ prior to turning circuit DSC ON.
Page 152: Circuit Pwi - Power Indication (Ccitt 213)
CHAPTER 9: TECHNICAL INFORMATION Circuit PWI - Power Indication (CCITT 213) Direction: FROM 7500 The ON condition indicates that power is on at the 7500. Circuit DLO - Data Line Occupied (CCITT 203) Direction: FROM 7500 The ON condition of this circuit indicates that the communication channel is in use.
Page 153: Circuit Pnd - Present Next Digit (Ccitt 210)
One use of these interchange circuits for control purposes is the passing of the EON code combination to the 7500 after the last digit of the number to be called has been passed.
Page 154: Circuit Dpr - Digit Present (Ccitt 211)
Circuit DPR - Digit Present (CCITT 211) Direction: TO 7500 Signals on this circuit are generated by the DTE to indicate that the 7500 may read the code combination presented on Circuits NB1, NB2, NB4, and NB8. The OFF to ON transition indicates that the DTE has set the states of Circuits NB1, NB2, NB4, and...
Page 155: Packet Assembler Disassembler (Pad) Capabilities
The 7500 options provide capabilities comparable, but not identical, to those outlined in the CCITT X.3, X.28, and X.29 specifications. The Local Mode commands provide the functions analogous to those specified in X.28. The 7500 supports all X.29 messages received from a remote X.25 endpoint except the Reselection PAD message.
Page 156 CHAPTER 9: TECHNICAL INFORMATION Table V: X.3 Parameters (Contd) Parameter Parameter Selectable Parameter Meaning Reference Description Possible Values Number No padding after CR Padding after carriage return (CR) Line folding No line folding 300 bit/s Binary speed of 1200 bit/s start-stop DTE 2400 bit/s 4800 bit/s...
Page 157 CHAPTER 9: TECHNICAL INFORMATION...
Page 158: Reference
B-channel Mode 3/2 adaptive (BA). Mode 3/2 adaptive on the B-channel. If you select this value, the 7500 will attempt to establish a circuit-switched Mode 3 call. If the system you are calling cannot accept this type of call, the 7500 will attempt to establish a circuit-switched Mode 2 data call Mode 3 causes slightly higher delays on transmitted and received data than Mode 2, but it provides automatic error correction.
Page 159: Asynchronous Dte 7500
REFERENCE Asynchronous DTE 7500 Provides the D-channel functionality to allow one associated asynchronous, EIA-232D data communications equipment (i.e., modem) to interface with the ISDN network using X.25 data transfer. This mode of operation is intended primarily for use with the X.25 Modem Pooling feature of the 5ESS.
Page 160: Table W: Asynchronous Configuration
REFERENCE Tables below indicate which modes of operation are supported by each of the 7500’s user configurations. Asynchronous Configuration Table W: PROVI- ASYNCHRONOUS MODE SIONED CONFIGURATION 3/2 (B) X.25 (D) Single DCE Dual DCE Single DTE (Modem Pool) Synchronous Configuration...
Page 161: Optional Enhancement Boards
This board comes with an adhesive RS-366 label with instructions to affix the label to the back panel of the 7500 to help alleviate the problem of mistaking this for a second EIA-232D interface. Second Asynchronous Interface Enhancement Board This optional board is used to provide a second asynchronous EIA-232D interface.
Page 162: Appendix
APPENDIX Hexadecimal Values for ASCII Characters Table Y: " & < > ˆ — ¦ ¯...
Page 163: Cause Messages
APPENDIX The following two tables show cause messages that may occur due to system problems. The cause name will appear on your screen — use this reference for explanation of the cause name and for restart recommendations. Table Z: X.25 Cause Messages Stimulus Reset Restart...
Page 164: Table Aa
APPENDIX Table AA: Q.931 Cause Messages Text Q.931 Code Cause Name FAR END REQUESTED Normal WRONG ADDRESS Unassigned Number WRONG ADDRESS Incomplete Address NETWORK FAILURE Temporary failure WRONG CHANNEL Channel unacceptable WRONG CHANNEL Channel does not exist No B-channel available DATA CALL BLOCKED CALL OPTION ERROR Facility not implemented...
Page 165 APPENDIX...
Page 166: Index
Index Automatic Speed and Parity Adjustment, 7500 Asynchronous DCE, Asynchronous DTE, Automatic Calling Unit Interface, BA, Pin 2 - Transmitted Data, Configuration and Features, BB, Pin 3 - Received Data, Front Panel, Binary (8-bit) File Transfer, How the Buttons Work,...
Page 167 (CD), Pin 20, 131, 134 Idle.timer Option, 40, 61 DTR, 57 Including X.25 Call Options, Pin 20/H, Information, Technical, Data Transmission, Installing the 7500, Continuing, Interface Information, Suspending, EIA (DCE), DCD, see Data Carrier Detect, EIA (DTE), 132 DCE, 129 V.35,...
Page 168 Index Pin 18 - Analog Loopback (CN), Pin 18 - Local Loopback (LL), Pin 18/L - Local Loopback, Pin 2 - Transmitted Data (BA), 129, 132 Pin 20 - Data Terminal Ready (CD), 131, 134 Pin 20 - Ring Indicator (CE), Main Menu, 10, 11 Pin 20/H - Data Terminal Ready,...
Page 169 Index Synchronous, Call Control Menu, DCE Features, Ending Data Calls, Ready for Sending, Pin 5/D, Placing Data Calls, Received Data (BB), Pin 3, 130, 133 Synchronous DCE Configuration, Received Data, Pins 3/R and 3/T, Synchronous Interface Information, Received Line Signal Detect (CF), Pin 8, 130, Synchronous/Asynchronous Menu, Received Line Signal Detect, Pin 8/F,...
Page 170 Index X.25 Call Options, ZCA Option (Zero Called Address), 40, 70...

AT&T 7500 User Manual

1 : Introduction

4 On "System Administrator": an Important Note to All Users

2 : Product Overview

3 : Front Panel Feature Access

4: Definitions of 7500 Options 5

5 : Asynchronous Dce Configuration 7

6 : Asynchronous Dte Configuration

7 : Synchronous Dce Configuration

8 : Installing the 7500

Appendix

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Summary of Contents for AT&T 7500

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