Maintenance-Object Repair Procedures
555-233-143
8-1704 Issue 1 May 2002
b. Event ID # 2 Modem Offhook test failed — With 3 consecutive failures of
this test, the following Major alarm is logged:
#1,ACT,USB1,A,2,MIN,USB Modem Offhook test failed
System Technician-Demanded Tests:
Descriptions and Error Codes
Always investigate tests in the order presented in the following table. For
example, by clearing error codes associated with the Handshake test, you may
also clear errors generated by other tests in the testing sequence.
Handshake Test
This test is destructive.
This test verifies that modem’s hardware is attached and that the modem can
“handshake” with the USB port. The test:
1. Tries to open the device
2. Sends a handshake string (ATZ) to the modem
The modem should return an “OK” string.
The following errors can be detected:
Order of Investigation
Short Test
Sequence
Long Test
Sequence D/ND
1
1. D = Destructive; ND = Nondestructive
Handshake test X X D
Offhook test X X D
Reset USB test X X D
Table 8-661. TEST Handshake Test
Error Code
Tes t
Result Description / Recommendation
Modem in use,
try again later
ABORT Some other application is currently using the modem. Try again later.
Could not open
USB port
ABORT System error: An attempt to open the USB device failed. Try again
later.
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