Black Box LRU4240 manual Loopback Tests, Loop NET Test

Dual Trunk E1 Router

	Table 8-1 Self Test Indicators
Indicators	Description
DRAM CRC Error	CRC of RAM copy of executing code failed.
Flash Boot Error	CRC of flash boot code failed.
Flash Loader Error	CRC of flash factory loader failed.
Net Error	Pattern test failed.
Flash Write Error	Flash write test failed.

Loopback Tests

You can isolate sections of the Dual Trunk E1 Router to determine if it is defective. The problem is normally in the network.

This section describes each of the loopback tests you can perform from the Dual Trunk E1 Router’s front panel. The tests are:

•Loop NET 1/2

•Loop Payload

•Loop Up Remote and Loop Down Remote

NOTE: No test is 100% complete and a small portion of the network will remain untested. Your unit may allow only one active loopback at a time.

NOTE: In the figures that illustrate the available tests, the path for only one Port (Link) is shown, to prevent overly confusing drawings. If the test is also being run on the second port, its path will be similar to that shown in the figure.

Loop NET Test

The Loop NET test, illustrated in Figure 8-1, verifies the operation of the E1 network and is available only on full bandwidth.

This test loops the data received from the network back to the network. The data is regenerated before it is looped back; however, the unit does not perform additional processing of the data. This minimizes the impact of the unit during the test so that network problems can be isolated.

This test can loop Net1, Net2, and All Nets.

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