Mitel SX-200 DIGITAL Pabx Engineering Information Manual

							Troubleshooting 
information Gathering and Problem Clarification 
2.08 Chart 2-5 provides a list of the information which may be 
necessary in order to adequately categorize a fault. All relevant 
information should be gathered and entered into a site fault record. If 
the fault has resulted in total or partial shutdown of the system, much 
of this data will be unobtainable or irrelevant. In ‘such cases, reference 
should be made to PROCEDURE 1 of this document. 
Page 2-14  
						

							Troubleshooting 
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CHART 2-5 
INFORMATION GATHERING AND CLARIFICATION 
Action 
-alk to attendants and station users. 
Check Maintenance / Alarm indications. 
Collect data concerning environmental conditions. 
Verify system programming. 
Make special checks for new installations, additions 
or modifications. Description / Follow-up 
Obtain the following information: 
*frequency of occurrence 
*intermittent or continuous nature 
*area of the system in which the fault 
occurs 
l time period during which the fault 
occurs 
.number and types of users affected 
*ability of the attendant/user to make 
the fault reappear 
eoccurrence in relation to Central Office 
Busy Hour 
* Check maintenance log for fault/alarm 
reports. 
a Note whether the sys,tem is in Day 
Service, Nightl, or Night2 Service. 
* Check system LED and 7-segment display 
indicators for error codes. 
e Check if the system is located close to a 
heat source or a source of power 
radiation. 
l Note the temperature and humidity 
conditions and compare with specified 
operating parameters. 
l Check the susceptibility of the area with 
respect to static electricity generation. 
l The following can seriously affect the 
performance of the PABX: 
l power fluctuations 
l lightning storms 
*excessively high humidity 
*excessively high temperature 
0 dust 
l radio-frequency interference 
0 Check the existing programming to 
ensure that the correct options and 
features have been enabled. 
* Verify the Class Of Service (COS) 
assignments, trunk descriptors, and 
feature access codes. 
* Check that the procedures specified in 
Section MITL9108-093-ZOO-NA have been 
properly implemented. 
l Verify that any changes have been made 
in accordance with the appropriate 
practices, and to the prescribed 
standards. 
l Check for possible conflicts if features 
have been added or deleted, or if other 
programming changes have been made. emarks 
re Nota 
1 
?e Note 
2 
ze Note 
3 
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							Troubleshooting 
, - 
Step 
- 
6 
7 
- 
CHART 2-5 (Cont’d) 
INFORMATION GATHERING AND CLARIFICATION 
Action 
Make random miscellaneous checks. 
Check for minor alarm indications - these assist in 
isolating and categorizing faults 
Description / Follow-up 
l Ensure all circuit cards are properly 
seated. 
. Verify that the system fans are running. 
Check the cross-connect field for loose 
or damaged wiring, improperly seated 
connectors, or other signs of trouble. 
l Record relevant data and note the 
affected area of the system. 
Notes: 1. Refer to Section MITL9108-093-35’l-NA, RS-232 Maintenance Terminal for details on 
procedures. 
2. Refer to Section MITL9108-093-l80-NA, Engineering Information for the specified 
operating parameters. 
3. Refer to Sections MITL9108-093-I 05-NA, Features Description and 
MITL9108-093-210-NA, Customer Data Entry. 
c 
Page 2-16  
						

							Problem Confirmation Troubleshooting 
2.09 
Many faults, particularly intermittent faults, “disappear” before 
the troubleshooter is able to make a positive trace. Wherever 
possible, attempts should be made to force the problem to recur, such 
that the effects may be observed and hence the cause determined. The 
information gathered up to this point may be used to set up conditions 
relating as closely as possible to those under which the fault originally 
manifested itself. 
Useful Aids 
2.10 The aids listed in Table 2-l are useful in verifying fault con- 
ditions. 
Page 2-17  
						

							Troubleshooting 
TABLE 2-1 
TROUBLESHOOTING AIDS 
alarms. The primary source of troubleshooting information. 
8 A summary of all log messages is presented in Appendix A of 
this Section. 
Maintenance Terminal 
l Primary access to the maintenance log. 
e Allows testing of individual functional units, using directed 
diagnostics. 
0 Provides ability to query ALARM status, along with a variety 
of status reports. 
‘I-Segment Displays e Allows system power-up testing and operation to be 
monitored. 
Status LEDs 
(on peripheral cards) 
System Test Line 0 Used to determine if circuit is in use, idle, or 
not functioning. 
Q Allows access, through hardware connection, to specific 
equipment for test purposes. 
8 Usually used in lieu of a functional maintenance terminal. 
Page 2-l 8/I 8  
						

							Troubleshooting 
3. PERIPHERAL EQUIPMENT TROUBLESHOOTING PROCEDURES 
A. Line Cards 
3.01 The procedures detailed in the following paragraphs cover the 
isolation and correction of station line cards and SUPERSET@ 
line cards. Since these usually involve a degree of remoteness be- 
tween the individual sets and the SX-200m DIGITAL PABX, it is recom- 
mended that an additional person should assist the troubleshooter. 
ONS/Station Line Cards 
3.02 The 12 circuit ONS Line card (9109-010) is installed in the 
digital.bays, while the 8 circuit 8-Station Line card (9110-l 10) is 
installed in analog peripheral shelves, if present. Chart 3-l lists the 
steps involved in the testing of these cards. Further information con- 
cerning the characteristics, parameters and operation of the ONS card 
is contained in Section MITL9108-093- 125-NA. 
Page 3-l  
						

							Troubleshooting 
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1 
erify the problem. * Go to step 2. 
2 isconnect the affected circuit(s) from the 
ross-connect field. o Go to step 3. 
3 ‘se a butt-set to check if the problem persists. (es: l Go to step 4. 
uo : 
l Problem lies outside the PEIX. Check for 
problems with cabling and the telephone 
set. 
4 og into the Maintenance Terminal. * Must enter username and password. 
5 se SHOW STATUS command on the affected bav. 0 Go to step 6. 
6 required, examine the maintenance log to obtain 
rrther information. (use LOGS READ command). * Go to step 7. 
heck if there appears to be problems with more fes: @ Go to step 31. 
Ian one circuit. Uo : * 
GO to step a. 
heck if the affected circuit is of type 9109-010. tes: 0 Go to step 12. 
Uo : c Go to step 9. 
est all of the junctors (channels) in the affected 
av. * Use the TEST DEVICE TYPE command to 
test each of 31 junctors. 
l Go to step IO. 
10 
11 
12 IO any of the junctors fail? les: m Go to step Il. 
Uo: eGotostep13. 
lnseat the suspect card, and run the test(s) on the 
ailed junctor(s) again. Do they now pass? (es: 
e Replace faulty card. Problem fixed. 
uo : 
o Refer to Analog -Junctors troubleshooting 
procedures. 
Iun a directed TEST on the affected circuit; check 
est results returned to the terminal. Fail: o Reseat the card and rerun the test. 
Q If failure persists, replace the card and 
rerun the test. 
a If failure still persists, reinstall the 
original card, go back to step 5 and 
investigate further. 
Pass: o If programming problem is indicated, go 
to step 13. 
13 
14 Check the programming for the station; including 
ZOS, COR. and pickup groups; any programming 
errors? Yes: 
l Correct programming errors as required. :ee Note 
No: eGotostep14. 3 
Check that the associated line circuit LED lights 
rvhen the set is taken off-hook. No : o Replace the line card; if the problem 
persists, reinstall the original card, and 
go to step 32. 
CHART 3-l 
ONS / 8-STATION LINE CARD TROUBLESHOOTING PROCEDURES 
Action Description / Follow-up emarks 
Yes: e Go to step 15. ee Note 
1 
ee Note 
2 
Page 3-2  
						

							Troubleshooting 
CHART 3-l (Cont’d) 
ONS / 8-STATION LINE CARD TROUBLESHOOTING PROCEDURES 
tep Action Description / Follow-up Remarks 
15 
GO off-hook, and verify that dial tone is returned. Yes: l Go to step 21. 
No : l Go to step 16. 
16 Check if problem is intermittent. Yes: l Go to step 17. 
No: 
l Gotostep19. 
17 Ensure receivers are not busied out by Yes: l Return receivers to service, or refer to 
maintenance or due to malfunctions; (use SHOW DTMF receiver troubleshooting 
STATUS command). Busied out? procedures as required. 
No: mGotostep18. 
18 Ensure sufficient receivers are provided to carry 
the peak traffic load. Enough receivers? 
19 Check if Side Tone is present. No : 0 Add receivers as required; if problem see Note 
persists, go to step 19. 4 
Yes: * Go to step 19. 
Yes: l Go to step 20. 
No : l Replace the line card and retest; if 
problem persists, go to step 32. 
20 Check if calls can be completed without dial tone. Yes: * Problem is with control card(s). Go to 
step 32. 
No : l Replace the line card; if the problem 
persists, go to step 32. 
21 Dial one digit, and verity that Dial Tone is broken. Yes: Q Go to step 24. 
No : l Go to step 22. 
22 Check if call can be completed over Dial Tone. Yes: 0 Problem is with control card(s). Go to 
step 32. 
No : 0 Go to step 23. 
23 Problem lies in one of the following areas: e Check maintenance log for indications of 
*Main Control card problems in these areas. 
8 Receiver module * Refer to the applicable troubleshooting 
procedures. 
24 Complete the dialing process and check that 
ringback tone is returned. 
25 Replace the line card. Yes: 8 Go to step 26. 
Problem in either the control card(s) or 
the line card. 
No : * Go to step 25. 
* If problem persists, likely problem with 
control card(s). Go to step 32. 
26 Set up a call to the suspect line and verify that Yes: l Go to step 29. 
ringing is received. No : * Go to step 27. 
27 Verify that ringing generator output is within spec * If not within spec, refer to bay power see Note 
(90 VAC, 20 Hz). supply troubleshooting procedures; 5 
otherwise, go to step 28. 
Page 3-3  
						

							Troubleshooting 
CHART 3-l (Cont’d) 
ONS / 8-STATION LINE CARD TROUBLESHOOTING PROCEDURES 
l Go to step 30. 
l Replace line card and retest. 
. If problem persists, reinstall the original 
line card, and go to step 32. 
Flash switchhook and check if the call is dropped. o If timing is too short, increase flash time 
via CDE. NOTE- Be aware of limitations 
of flashing while connected to a trunk. 
No : * Line circuit is functioning correctly - 
continue to monitor. 
* If there is a system CRITICAL ALARM 
an overall view of the problem(s). condition, go see Note 1 of the Critical 
Alarm troubleshooting procedures in 
paragraph 2.06. 
B If there is a system MAJOR ALARM 
condition, go to the Major Alarm 
troubleshooting procedures in paragraph 
e If there is a system MINOR ALARM 
condition, address each problem 
PERIODS OF LOW OR NO TRAFFIC, AS IT WILL HAVE 
BEFORE PROCEEDING, ATTEMPT A SYSTEM RESET, 
E MAIN CONTROL CARD FRONT PANEL - CHECK IF 
TO STEP 32 UNLESS SPECIFICALLY DIRECTED TO IT 
Yes:. 0 Go to step 37. 
No : e Go to step 33. 
e Go to step 34. 
on the maintenance panel/top panel. 
bay. Does fault persist? 
baY. Does fault persist? 
the fault persist? * Power down shelf; go to step 35. 
0 Problem fixed. 
Yes: a Power down shelf; go to step 36. 
e Problem fixed. 
e Possible problem with Main Control card; 
go to step 37. 
No : * Problem fixed. 
lace the Main Control to Mite1 field service. 
Page 3-4  
						

							Troubleshooting 
Notes to Chart 3-1: 
1. 
2. 
3. 
4. 
5. Refer to Section MITL9108-093-351-NA, RS-232 Maintenance Terminal for details of 
procedures. 
This is indicated by an error message returned to the terminal. 
Refer to Sections MITLS 108-093-210-NA, Customer Data 
MiTL9108-093-105-NA, Features Description for details of procedures. Entry and 
Refer to Section MITL9108-093-180-NA, Engineering Information for details on re- 
ceiver provisioning. 
90 V Ringing is labelled both on the backplane and the rear-door power supply. 
OPS Line Card 
3.03 OPS Lines are provided where the distance of the station from 
the PABX is greater than allowable for a regular ONS line, or 
where the station is required to be in a location removed from the 
PABX (up to 2 km away). Chart 3-2 contains information on the trou- 
bleshooting of this card type. Note that these procedures apply to card 
type 9109-040 only. Refer to the ONS line card procedures, for off- 
premise extensions connected to card type 9110-l 10. Further informa- 
tion concerning the characteristics, parameters and operation of the 
OPS line card is contained in Section MITL9108-093-125-NA. 
Page 3-5