AT & T PRACTICE SECTION 231-017-301 Standard Issue 4, January 1981 Reprinted June 1984 *"" DIAL TONE DELAY ALARM OPERATION NO. 1 ELECTRONIC SWITCHING SYSTEMS CONTENTS PAGE designed as an external module to detect catastrophic system problems which may not be known or are 1. GENERAL not available through normal internal means. The alarm is internal to the DTDA unit and consists 2. DIAL TONE DELAY ALARM CONTROLS 2 of a 1000-Hz signal amplified and fed at a high level to a monitor speaker. The test line should 3. TTY CONTROL OF THE DTDA 3 have an originating only (denied terminating) class of service. 4. DTDA INTERFACE WITH OFFICE ALARM SYSTEM 3 1.04 The line location to which the test line is assigned should be changed at intervals as s. CHANGING ASSIGNMENT OF TEST LINE 4 specified in the Equipment Test List. The new assignment may be in any frame, but it should not 6. ASSIGNING A TE~T LINE (NEW OFFICE) 4 be associated with the same first stage as the previous assignment. Rotation of the test line assignment distributes the test call load more 1. GENERAL evenly. The dial administrator is responsible for these assignments and procedures should be available 1.01 This section describes the operation of the to rotate the assignments on a routine basis. dial tone delay alarm (DTDA) used for 2-wire and 4-wire No. 1 Electronic Switching System 1.05 The DTDA unit (Fig. 1) is mounted below (ESS). the writing shelf on the trunk and line test panel of the master control center. 1.02 This section is reissued to eliminate outdated information and to correct errors in the 1.06 The traffic count programs score a false section. Since this reissue is a general revision, start for each test origination (measurement arrows ordinarily used to indicate changes have Code 05, office count number 023). Each time been omitted. the rate is changed by moving the TIME control, the traffic department should be notified of the 1.03 The purpose of the DTDA (SD-1A277-01) is new rate. The traffic department should also be to sound an alarm if an ESS office fails to notified when tests are started or discontinued in supply dial tone to a test line within required order that the false start count can be properly timing limits of 8 to 10 seconds. This device is evaluated. '. AT & T TECHNOLOGIES, INC.• PROPRIETARY Printed in U.S.A. Page 1 ./ -----------------------------" SECTION 231-017-301 ,.--.. Fig. 1-Dial Tone Delay Alarm Unit 2. DIAL TONE DELAY ALARM CONTROLS VOL The VOL (volume) control adjusts the output volume of the dial tone 2.01 The following controls are provided to being received. A dial tone monitor monitor and control the DTDA. circuit receives, amplifies, and feeds dial tone to a monitor speaker. This feature permits maintenance personnel to monitor operation of the DTDA. The VOL control CONTROL permits the dial tone to be DESIGNATION PURPOSE completely silenced for normal conditions. This control does not TIME The TIME control permits adjusting affect the volume of an alarm the rate at which test originations signal. occur from one origination every 20 seconds to one origination every 60 seconds. 2.02 The following keys and lamps are provided to control and test operation of the DTDA. Page 2 ISS 4, SECTION 231-017-301 KIi=Y OR LAMP LAMP DESIGNATION COLOR PURPOSE TST Yellow The TST (test) key is a locking pushbutton switch which opens the test line so that the system does not detect the off-hook condition. If the alarm circuit is functioning properly, the alarm sounds when origination and time-out functions occur after this key is operated. RST The RST (reset) key is a pushbutton switch used to recycle the test sequence. The RST key is normally used to silence the alarm after the TST key has been operated. PWR OFF Red The PWR (power) OFF key is a locking pushbutton switch used to remove power from the DTDA unit. The power should be removed before working on circuits or before replacing circuit packs. 3. TTY CONTROL OF THE DTDA company. One scan point is used to detect an alarm-on condition, and the other scan point is 3.01 The occasion may arise when the DTDA used to detect an alarm-off condition. If an alarm must be retired, enabled, or disabled by is sounded by the DTDA circuit, an audible major means other than the DTDA controls discussed in alarm is sounded and the maintenance TTY prints Part 2. An example of this control is switching out the following message: control center (SCC) accessing the CO. In this case, the audible alarms at the CO must, be remotely AR01 MISC ALM MJ SPL 127 controlled from the SCC TTY. The DTDA alarm is retired by operating the RST 3.02 The following TTY message provides the RLS key on the DTDA. The DTDA may also be ability to retire, enable, or disable the DTDA. retired with the input message ALRM-CONFIG-DTD This message is available with 2-wire generic xxx. This message is available with 2-wire generic programs. programs. Refer to paragraph 3.02for an explanation of this message. ALRM-CONFIG-DTD xxx. 4.02 Retirement of the alarm at the DTDA unit, xxx = RTR-Retires the alarm and resets the either, automatically or manually results in DTDA circuit an audible minor alarm being sounded and in the following TTY output message (Refer to paragraph = INH-Disables the DTDA circuit and does 4.04): not allow any alarms -r:': NOR-Enables the DTDA circuit to function AR01 MISC ALM MN SPL 127 normally. When typing in the retire message, the only system This minor alarm is retired by operating the ALM response is 0K. When typing in disable or enable, RLS key on the alarm, display, and control panel. the system response is 0K and an ARlO message. The ARlO message indicates the status of the DTDA (status being inhibited or normal). 4.03 For unattended offices these alarm messages appear on the remote maintenance TTY and 4. DTDA INTERFACE WITH OFFICE ALARM SYSTEM the remote audible alarm sounds. The remote audible alarm can be retired at the remote TTY. 4.01 The DTDA circuit has connections for two The ALRM-CONFIG-DTD xxx. message (paragraph master scanner applique (scan) points 3.02) may be used at the remote maintenance TTY (SD-1A210-01) which are assigned by the operating to retire the DTDA. Page 3 -----------~-----------~------- // SECTION 231-017-301 4.04 The following table gives translation xxx xxxx Directory Number of test information associated with the alarm scan line points. yyyyyy = Old TNN FOR FERRODS zzzzzz = New TNN DESIGNATION ALARM·ON ALARM-OFF System response: t• NPI - Nontrunk RC ORD ACPT Program Index 39 32 UTY -- Unit Type 44 45 (3) Change the LEN by changing the appropriate jumpers. MEMN - Member Number 127 127 (4) To verify if system accepts new DN-LEN translations, type in 5. CHANGING ASSIGNMENT OF TEST LINE VFY-DN-30 bbb bbbb. 5.01 Use the following procedure to change bbb bbbb = Directory number assignment of a test line. System response should be TROI message with (1) Remove power from DTDA. System prints translation information. out (5) Restore power to DTDA by releasing PWR MA 11 MAN PWR RMV MCCD 0 OFF key. Key lamp is extinguished and system prints out (2) Change LEN (2-wire) or TNN (4-wire) by typing in one of the following: MA12 PWR RST MCCD 0 (a) 2-wire offices Initialize circuit test by depressing reset key. Dial tone should be heard at next test RC:LINE;CHG: origination. ORD mriririririn TN aaaaaaa (6) Check timing to see if time interval between OE bbbbbbbb test originations is correct. IOE cccccccc! mriririririn Order number 6. ASSIGNING A TEST LINE (NEW OFFICE) aaaaaaa Directory number of test line 6.01 Use the following procedure to assign a new test line in a 2-wire office: bbbbbbbb = Old LEN RC:LINE: cccccccc = New LEN oRD mriririririn TN xxxxxxx (b) 4-Wire offices LCC yyy oE zzzzzzzz! (ORD) 0000 (ACT) X (TYP) CHG (TEL) xxx xxxx ri\riririririn = Order number (TNN) yyyyyy (SUP) DATACG xxxxxxx = Directory number of test NEWTNN zzzzzz t X-OFF line Page 4 ~' - - - ­ ISS 4, SECTION 231-017-301 K~Y OR LAMP LAMP DESIGNATION COLOR PURPOSE TST Yellow The TST (test) key is a locking pushbutton switch which opens the test line so that the system does not detect the off-hook condition. If the alarm circuit is functioning properly, the alarm sounds when origination and time-out functions occur after this key is operated. RST The RST (reset) key is a pushbutton switch used to recycle the test sequence. The RST key is normally used to silence the alarm after the TST key has been operated. PWR OFF Red The PWR (power) OFF key is a locking pushbutton switch used to remove power from the DTDA unit. The power should be removed before working on circuits or before replacing circuit packs. 3. TTY CONTROL OF THE DTDA company. One scan point is used to detect an alarm-on condition, and the other scan point is 3.01 The occasion may arise when the DTDA used to detect an alarm-off condition. If an alarm must be retired, enabled, or disabled by is sounded by the DTDA circuit, an audible major means other than the DTDA controls discussed in alarm is sounded and the maintenance TTY prints Part 2. An example of this control is switching out the following message: control center (SCC) accessing the CO. In this case, the audible alarms at the CO must' be remotely AROI MISC ALM MJ SPL 127 controlled from the SCC TTY. The DTDA alarm is retired by operating the RST 3.02 The following TTY message provides the RLS key on the DTDA. The DTDA may also be ability to retire, enable, or disable the DTDA. retired with the input message ALRM-CONFIG-DTD This message is available with 2-wire generic xxx. This message is available with 2-wire generic programs. programs. Refer to paragraph 3.02for an explanation of this message. ALRM-CONFIG-DTD xxx. 4.02 Retirement of the alarm at the DTDA unit, xxx RTR-Retires the alarm and resets the either. automatically or manually results in DTDA circuit an audible minor alarm being sounded and in the following TTY output message (Refer to paragraph INH-Disables the DTDA circuit and does 4.04): not allow any alarms NOR-Enables the DTDA circuit to function AROI MISC ALM MN SPL 127 normally. When typing in the retire message, the only system This minor alarm is retired by operating the ALM response is 0K. When typing in disable or enable, RLS key on the alarm, display, and control panel. . the system response is 0K and an ARlO message. The ARlO message indicates the status of the DTDA (status being inhibited or normal). 4.03 For unattended offices these alarm messages appear on the remote maintenance TTY and 4. DTDA INTERFACE WITH OFFICE ALARM SYSTEM the remote audible alarm sounds. The remote audible alarm can be retired at the remote TTY. 4.01 The DTDA circuit has connections for two The ALRM-CONFIG-DTD xxx. message (paragraph master scanner applique (scan) points 3.02) may be used at the remote maintenance TTY (SD-lA2l0-0l) which are assigned by the operating to retire the DTDA. Page 3