Mitel SX-200 DIGITAL Pabx Engineering Information Manual

Troubleshooting 
APPENDIX C 
TWOUBLE§H0081NG KllT 
Cl.01 
l 
l 
m 
0 
l 
l 
l 
l 
l 
l 
m 
The following is a recommended list of items required in the 
Field Service Engineering Troubleshooting Kit: 
One of each circuit card as a spare, including modules 
Butt set 
Digital multimeter 
Moving coil multimeter 
Static strap 
Ground mat 
Assorted screwdrivers, wrenches 
Long nose pliers 
Spare fuses 
Wire strippers 
Fan filter. 
Page C-lL1  

Troubleshooting 
APPENDIX D 
LOOP CURRENT MEASUREMENT 
D1.O1 There are two methods available to measure loop current: 
0 In-Line method. 
0 Voltage conversion measurement. 
If it is not possible to break the loop (i.e., open the Tip or Ring lead) 
the second method may be used: however, it is not as accurate. 
D1.02 In-Line Method. The procedure for the in-line method of 
measuring loop current is shown in Figure Dl-1 and is de- 
scribed as follows: 
I. Open either the Tip or Ring lead of the trunk...

Troubleshooting 
MDF 
BRIDGE CLIP 
TRUNK FACILITY 
5512ROEI 
Figure Dl-1 In-Line Current Measurement 
Page D-2  

Troubleshooting 
6. The following is a simple calculation used to obtain the loop 
current value: 
Loop Current = measured Tip to Ring voltage 
250 
Page D-3/3  

Troubleshooting 
APPENDIX E 
LOOP START VS GROUND START CHECK 
El.01 
1. 
2. 
3. 
4. 
5. 
6. 
7. The loop start vs ground start check should be performed as 
follows (also refer to Figure El-l): 
Locate the PBX trunk circuit Tip and Ring on the connecting 
block at the MDF. 
Remove the bridge clips on the Tip and Ring (i.e., disconnect 
the PBX trunk circuit from the Central Office Tip and Ring). 
Connect the butt set across the Central Office Tip and Ring. 
Go off-hook with the butt set. If Central...

Troubleshooting 
CONNECTING BLOCK 
TO PABX 
TRUNK CIRCUIT 00 TO CENTRAL 
OFFICE 
00 
HOOK SWITCH 
Figure El-l Loop Start Versus Ground Start Check 
Page E-2/2  

Troubleshooting 
APPENDIIX F 
IWTEL REPAIR TAG 
General 
F1.01 Any card or any other device found faulty must be returned 
with a Mite1 Repair Tag (see Figure Fl-1). The following in- 
formation must be included on the repair tag: 
1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. 
11. 
12. 
13. The date on which the device was returned. 
The location of the point of origin (the installation site). 
The company name. 
The product name (i.e., SX-200@ DIGITAL). 
The system serial number (located on the front of the...

Troubleshooting 
For Customer Use 
1. Date: 
2. Location: 
3. company: 
4. Product Name: 
5. System Serial No.: 
6. Software ID Generic: 
Revision: 
7. Assembly No.: 
8. Assembly Serial No.: 
9. Alarm/Error Displays: 
11. Failure Occurred A) During Installation 
8) In Service Further Details 
issue 3 
CAUTION: PLEASE ENSURE PCB ASSEMBLY IS 
RETURNED IN ANTISTATIC BAG. 
M0013RO 
Figure Fl-1 The Mite1 Repair Tag 
Page F-2/2  

Troubleshooting 
ABPENQIX 6 
CALL PROCESSING INFORMATION 
G1.O1 
1. 
2. 
3. 
4. 
5. 
8. 
7. 
8. 
9. 
10. 
11. 
12. 
13. 
94. 
15. 
18. 
17. - Digital Bay to Digital Bay Call 
The Main Control Card (MCC) scans for on-hook/off-hook 
change of state. 
An extension goes off-hook in Bay 1. 
The MCC detects the off-hook during its line card scan. 
MCC checks for the COS of the extension to determine if the 
call is allowed. 
The MCC checks for an idle receiver. 
The MCC connects the DTMF receiver to the line...

Troubleshooting 
18. 
19. 
20. 
21. 
22. 
G1 .I92 
1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
IO. 
11. 
12. 
93. 
14. 
15. Ringing is removed from the destination. 
Ringback is removed from the originator. 
A channel is connected between the originator and the destina- 
tion. 
The MCC scans for on-hook/off-hook changes of state. 
When an on-hook is detected, the MCC removes the channel, 
and the call is terminated. 
- Analog Bay (Rotary) to Analog Bay Call 
The Scanner card scans the line circuits for...