Exercise 3-1. Configuring the Lab-Volt PABX. Unique Identification Number Associated with a Digital Telephone Set EXERCISE OBJECTIVE

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1 Exercise 3-1 Configuring the Lab-Volt PABX EXERCISE OBJECTIVE When you have completed this exercise, you will be able to modify the Lab-Volt PABX configuration by editing a variety of parameters using the host computer connected to the PABX. DISCUSSION Introduction The Lab-Volt PABX configuration, like that of actual digital PABX's, can easily be modified to make the Lab-Volt PABX operate as required. Changes to the Lab-Volt PABX configuration are performed using the host computer running the Lab-Volt Telephony Training System (LVTTS) software. All parameters related to the PABX configuration can be edited via the PABX Settings folder in the Options dialog box of the LVTTS software. Lab-Volt PABX Configuration This section enumerates the various parameters related to the operation of the Lab-Volt PABX that can be configured. It also explains how to set each of these parameters. Unique Identification Number Associated with a Digital Telephone Set Each digital telephone set which can be connected to the Lab-Volt PABX is provided with a unique identification number. This number is referred to as a service profile identifier (SPID). Four SPID's are recorded in the Terminal Addressing section of the PABX Settings folder since up to four digital telephone sets can be connected to the Lab-Volt PABX. The value of each SPID in the Terminal Addressing section can be edited as required. Note: For a digital telephone set to be operational when connected to the Lab-Volt PABX, its SPID must match one of the SPID's in the "Terminal Addressing" section of the "PABX Settings" folder. This SPID must also differ from the SPID's of the other digital telephone sets connected to the PABX. To fulfill the above requirements, SPID's in the "PABX Settings" folder can be edited or the SPID programmed in each digital telephone set can be changed. Appendix C of the "Private Automatic Branch Exchange" student manual (part number ) explains how to change the SPID programmed in a digital telephone set. 3-3

2 Terminal Number Assigned to a Digital Telephone Set A terminal number is a number to be dialed to place a call to a particular digital telephone set connected to the Lab-Volt PABX. In the Terminal Addressing section of the PABX Settings folder, a terminal number is assigned to each digital telephone set by associating a terminal number with each SPID. Like the SPID's, each terminal number in the Terminal Addressing section can be edited as required. Attendant's Terminal Designation In any PABX, the attendant's terminal is the telephone set toward which all calls from the outside are directed. In the Lab-Volt PABX, a headset-like icon in the Attendant's Terminal column of the Terminal Addressing section of the PABX Settings folder indicates which digital telephone set is designated as the attendant's telephone set. Clicking another row in the Attendant's Terminal column of the Terminal Addressing section moves the headset-like icon to this row, and thereby, designates another digital telephone set as the attendant's terminal. External Call Restriction In the Lab-Volt PABX, it is possible to prevent establishment of external calls at certain terminals (digital telephone sets). This feature is usually referred to as external call restriction. Checking any of the External Call Restriction boxes in the Terminal Addressing section of the PABX Settings folder prevents establishment of external calls at the corresponding terminal (digital telephone set). Frequency Content, Duration, and Volume of the Intercom Annunciator Tone In most PABX's, there is an annunciator tone at the beginning of each intercom call. In the Lab-Volt PABX, the Intercom Annunciator Tone section of the PABX Settings folder allows you to set the frequency content, duration, and volume of the annunciator tone. Note: You can verify how the settings you made affect the intercom annunciator tone by connecting one of the speakers provided with the Telephony Training System to either auxiliary output C or D of the Reconfigurable Training Module and clicking the "Test" button in the "Intercom Annunciator Tone" section. External Call Number Length In the Lab-Volt PABX, the number of digits to be dialed when performing an external call can be selected. This selection is made through the External Call Number Length drop-down list in the Analog Trunk section of the PABX Settings folder. Note that this selection must be consistent with the length of the telephone numbers used in the CO to which the Lab-Volt PABX is connected. 3-4

3 External Call Establishment Pace When an external call is established, the pace at which the digits dialed by the calling party are retransmitted to the CO via the PABX analog trunk can be set to normal, slow, or a user-determined value. This parameter is referred to as the External Call Establishment Pace in the Analog Trunk section of the PABX Settings folder. This parameter is usually set to normal. It is included for educational purpose only and is not available in commercial PABX's. Procedure Summary In the first part of the exercise, you will set up an analog trunk between a Lab-Volt PABX and a Lab-Volt CO. In the second part of the exercise, you will configure the Lab-Volt PABX in order to meet the requirements of a hypothetical application. You will then test the Lab-Volt PABX configuration and have your instructor verify that it meets the specified requirements. EQUIPMENT REQUIRED Refer to Appendix A of this manual to obtain the list of equipment required to perform this exercise. PROCEDURE Setting Up an Analog Trunk Between a Lab-Volt PABX and a Lab-Volt Central Office Note: In this exercise, it is assumed that a single host computer is used to download the PABX and CO programs to two Reconfigurable Training Modules, Model This host computer is used to monitor the Lab-Volt PABX. * 1. Make sure that two Reconfigurable Training Modules, Model 9431, are connected to the TTS Power Supply, Model Make sure that there is a network connection between each Reconfigurable Training Module and the host computer. Install the Dual Analog Line Interface, Model 9475, into one of the two analog/digital (A/D) slots of a Reconfigurable Training Module. This module will be used as a central office (CO). Connect an analog telephone set to the Dual Analog Line Interface. Make sure that the tone dialing mode is selected on this telephone set. 3-5

4 CAUTION! Do not connect or disconnect the analog telephone set when the Reconfigurable Training Module is turned on. High voltages are present on the standard telephone connectors of the Dual Analog Line Interface. Connect the AC/DC power converter supplied with the analog telephone set to one of the AC power outlets on the TTS Power Supply. Connect the DC power output jack of the AC/DC power converter to the DC power input connector on the analog telephone set. * 2. Install the Digital Telephone Interface, Model 9476, into the digital (D) slot or one of the two analog/digital (A/D) slots of the other Reconfigurable Training Module. This module will be used as a PABX. Connect two digital (ISDN) telephone sets provided with the Lab-Volt PABX to the left and right connectors of interface A of the Digital Telephone Interface. These telephone sets will be referred to as digital telephone sets A-left (AL) and A-right (AR), respectively, throughout the exercise. CAUTION! Do not connect or disconnect the digital telephone sets when the Reconfigurable Training Module is turned on. High voltages are present on the RJ-45 connectors of the Digital Telephone Interface. Finally, install the PABX Analog Trunk Interface, Model 9477, into one of the two analog/digital (A/D) slots of the Reconfigurable Training Module used as a PABX. Using the analog trunk line provided with the PABX Analog Trunk Interface (two-wire cable terminated with standard [RJ-11] male telephone connectors), connect the RJ-11 female connector on the PABX Analog Trunk Interface installed in the Reconfigurable Training Module used as a PABX to the remaining RJ-11 female connector on the Dual Analog Line Interface installed in the Reconfigurable Training Module used as a CO. * 3. Turn on the host computer. Turn on the TTS Power Supply, then turn on the Reconfigurable Training Modules. * 4. On the host computer, start the Telephony Training System software, then download the PABX program to the Reconfigurable Training Module used as a PABX. Note: If the host computer is unable to download the PABX program to the Reconfigurable Training Module used as a PABX, make sure that the proper IP address is used to communicate with this Reconfigurable Training Module. 3-6

5 * 5. Lift off the handset of each digital telephone set connected to the Lab-Volt PABX, while observing the Lab-Volt PABX diagram in the LVTTS software window. When the handset of a digital telephone set is lifted off, an icon representing this telephone set should appear connected to the corresponding DUAL DIGITAL LINE INTERFACE in the Lab-Volt PABX diagram. If so, this indicates that this telephone set is properly programmed to be operational with the Lab-Volt PABX. Otherwise, this means that this telephone set is not properly programmed to be operational with the Lab-Volt PABX. Note: An icon representing the digital telephone set may already be displayed in the Lab-Volt PABX diagram before you lift off the handset of this telephone set. This occurs because each digital telephone set automatically begins communication with the Lab-Volt PABX a certain time after it is powered up in order to identify itself to the Lab-Volt PABX. This indicates that this digital telephone set is properly programmed to be operational with the Lab-Volt PABX. If a digital telephone set does not seem to be properly programmed, refer to Section 4 of the Telephony Training System User Guide (part number E0), entitled "Familiarization with the Lab-Volt PABX", to know how to properly program the digital telephone sets connected to the Lab-Volt PABX. Hang up the handset of each digital telephone set. * 6. On the host computer, download the CO program to the Reconfigurable Training Module used as a CO. Note: If the host computer is unable to download the CO program to the Reconfigurable Training Module used as a CO, make sure that the proper IP address is used to communicate with this Reconfigurable Training Module. Once the CO program has been downloaded, a box representing the Lab-Volt CO will appear connected to the PABX, via an analog trunk, in the Lab-Volt PABX diagram displayed on the host computer screen. Record below the telephone numbers associated with ANALOG LINE INTER- FACEs A and B of the Lab-Volt CO. ANALOG LINE INTERFACE A (ALI A): ANALOG LINE INTERFACE B (ALI B): 3-7

6 Note: If you use two separate host computers to download the PABX and CO programs to the two Reconfigurable Training Modules used in this exercise, no box representing the Lab-Volt CO will appear in the Lab-Volt PABX diagram once the CO program has been downloaded. In that case, you can access the LVTTS Options dialog box (or the Call Processor Settings dialog box) on the host computer that monitors the Lab-Volt CO to know the telephone numbers associated with each analog line interface. For the rest of this exercise, however, the term host computer always refers to the computer monitoring the Lab-Volt PABX. PABX Configuration * 7. Configure the Lab-Volt PABX as indicated below. To do so, access the PABX Settings folder in the Options dialog box of the host computer that monitors the Lab-Volt PABX. Digital Telephone Set SPID's and Terminal Numbers , , , , 513 Attendant's Telephone Set..... Terminal number of telephone set AR External Call Restriction Terminal number of telephone set AL Intercom Annunciator Tone Frequency Content Hz Hz Duration s Volume As desired Finally, set the external call number length so that it matches the length of the telephone numbers in the Lab-Volt CO. * 8. Modify the SPID's programmed in digital telephone sets AL and AR so that they match two of the SPID's programmed in the Lab-Volt PABX. Re-initialize the Lab-Volt PABX. * 9. Verify that the Lab-Volt PABX is configured according to the settings given in step 7. To do so, make internal and external telephone calls under various situations, using the digital telephone sets connected to the Lab-Volt PABX and the analog telephone set connected to the Lab-Volt CO. When necessary, perform observation of signals at the proper test points using the Oscilloscope and the Spectrum Analyzer. * 10. When you think the Lab-Volt PABX is properly configured, ask your instructor to verify that the configuration corresponds exactly to the specifications given in step

7 * 11. On the host computer, close the Telephony Training System software. Turn off the TTS Power Supply, as well as the host computer (if it is no longer required). Disconnect the AC/DC power converter from the TTS Power Supply and the analog telephone set. Remove the analog trunk line (two-wire cable terminated with standard [RJ-11] male connectors) connecting the PABX Analog Trunk Interface installed in the Reconfigurable Training Module used as a PABX to the Dual Analog Line Interface installed in the Reconfigurable Training Module used as a CO. Disconnect the digital telephone sets from the Digital Telephone Interface installed in the Reconfigurable Training Module used as a PABX. Remove the Digital Telephone Interface and the PABX Analog Trunk Interface from this module. Disconnect the analog telephone set from the Dual Analog Line Interface installed in the Reconfigurable Training Module used as a CO. Remove the Dual Analog Line Interface from this module. CONCLUSION In this exercise, you became familiar with the configuration of a PABX. You saw that the Lab-Volt PABX configuration, like that of actual digital PABX's, can quickly and easily be modified using the computer running the LVTTS software. You configured the Lab-Volt PABX in order to meet the requirements of a hypothetical application. You saw that the parameters related to the PABX configuration, such as the terminal numbers and SPID's of the digital telephone sets, the designation of the attendant's telephone set, the restrictions, number length, and establishment pace of external calls, as well as the frequency content, duration, and volume of the intercom annunciator tone, can be set via the PABX Settings folder in the Options dialog box of the LVTTS software. REVIEW QUESTIONS 1. What two parameters related to the Lab-Volt PABX configuration designate a particular digital telephone set connected to the PABX? 2. What is the name of the parameter related to the Lab-Volt PABX configuration that allows you to select the digital telephone set toward which all calls from the outside will be directed? 3-9

8 3. What is the name of the parameter related to the Lab-Volt PABX configuration that allows you to limit call establishment at certain digital telephone sets to internal calls only? 4. In the Telephony Training System, which dialog box allows parameters related to the configuration of the Lab-Volt PABX to be changed? 5. What is the name of the parameter related to the Lab-Volt PABX configuration that sets the number of digits to be dialed when performing an external call? What must the setting of this parameter be consistent with? 3-10