CO Demand Diagnostic Test (#3)

For ground start trunks, port Media Module relays are operated and checks are made to see if the port can detect and apply ground on the Tip lead. This test also verifies that there is no external ground on the Ring lead. In the absence of other failures, the Media Module should be replaced only if this test fails with the CO line disconnected.

This test also checks the on-board programmable transmission circuits that allow the Media Module to support transmission characteristics of several different countries.

Table 6. TEST #3 CO Demand Diagnostic Test �
Error Code	Test Result	Description/ Recommendation
	ABORT	Could not allocate system resources to run this test. Retry the command at 1-minute intervals for a maximum of 5 times.
1000	ABORT	System resources required to run this test are not available. The port may be busy with a valid call. Use the display port GGGVSpp command to determine the trunk group/member number of the port. Use the status trunk command to determine the service state of the port. If the service state indicates that the port is in use, then the port is unavailable for certain tests. You must wait until the port is idle before retesting. If the port status is idle, retry the command at 1-minute intervals for a maximum of 5 times.
1004	ABORT	The port was seized by a user for a valid call. Use the display port GGGVSpp command to determine the trunk group/member number of the port. Use the status trunk command to determine the service state of the port. If the service state indicates that the port is in use, then the port is unavailable for certain tests. You must wait until the port is idle before retesting. If the port status is idle, retry the command at 1-minute intervals for a maximum of 5 times.
1005	ABORT	Test inapplicable to present configuration. This is a normal condition.
1018	ABORT	Test has been disabled via administration. For this test to run, the Maintenance Tests? field on the trunk group form must be set to n. The form is accessed with the change trunk-group grp# command.
2000	ABORT	Response to the test was not received within the allowable time period. Retry the command at 1-minute intervals for a maximum of 5 times.
	FAIL	Failure to detect ground or faulty ground detected on Ring lead. Display the hardware errors for this trunk, to determine if the fault was on- or-off board. Look for Error Type 1025 or 1281 (if both appear in the Hardware Error Log, pick the most recent error). Error Type 1025 indicates a faulty ground detected on Ring lead (an off-board fault) and Error Type 1281 indicates failure to detect (internally generated) ground (an on-board fault). Faulty ground detected on Ring lead (Error Type 1025): Repeat test. If test passes, ignore the original failure. If test aborts, follow the recommended procedures. Repeat test with CO line removed. If test fails, replace the Media Module. If test passes, refer problem to CO. Failure to detect ground (Error Type 1281): Run the long test sequence. If the CO Demand Diagnostic Test fails, the Dial Tone Test (#0) fails with Error Code 2002, AND Error Type 3329 or 3585 appears in the Hardware Error Log (with the same last occurred time as Error Type 1281 and 1537), replace the Media Module. Repeat test with CO line removed. If test fails, replace the Media Module. If test passes, the CO may be drawing too much current. Refer problem to CO.
	PASS	This test verifies that the port is able to apply ground for outgoing calls and detect ground for incoming calls; however, it does not provide information on whether a CO line is actually connected. User-reported troubles on this port should be investigated by using other port tests and by examining trunk or external wiring.
Any	NO BOARD	The test could not relate the internal ID to the port (no board). Check to ensure that the board translations are correct. Translate the board, if necessary. Issue the busyout board command. Issue the reset board command. Issue the release busy board command. Issue the test board command. This should re-establish the linkage between the internal ID and the port.