This variable is used to initiate a specific test. It is used in conjunction with the dsx1LoopbackConfig managed object in RFC1406 Configuration Group. Setting dsx1NoLoop(1) stops all tests. Setting dsx1PayloadLoop(2) or dsx1LineLoop(3) causes that test to start as well as automatically setting this variable to other(1). other indicates that the dsx1LoopbackConfig option should be checked. The rest of the options have the following in common: Setting any of them causes that test to start as well as automatically setting dsx1LoopbackConfig to dsx1OtherLoop(4). csuLocalTest refers to a test that transmits a locally-generated test message through the DSU and looping it back at the network interface to the test equipment for verification. During this test, data is also transmitted to the T1 link, with pulse density constraints, but data is not received from the cascade port or the line. csuNILoop refers a test that tests the local DSU and the T1 link by transmitting a locally-generated test message through the local DSU to the remote DS1 Interface Connector and looping it back to the test equipment for verification. csuCascadeDigitalLoop refers to a test that tests both DSUs' circuitry and the T1 link by transmitting a remotely-generated test message through the remote DSU to the local DSU's cascade port interface and looping it back to the test equipment for verification. This test loops only those DS0s allocated to equipment on the cascade side of the local DSU. DS0s allocated to the local DSU or to the DSU on the network side of T1 are unaffected. csuRemoteLoop refers to a test that activates the remote DSU's DS1 Line Loopback function or DS1 Test Loopback function, depending on which one is enabled in the remote DSU. This tests both DSUs and the T1 link by transmitting a locally-generated test message through the local DSU to the remote DSU and looping it back to the test equipment for verification. Bipolar violations are uncorrected during this test when the remote DSU has its LLB function enabled. GDCPRODUCT EQUIVALENT POSSIBLESELECTIONS 552a-1 Loopback Test Loop, Line Loop, Local Test, Remote Test, NI Loop 552a Loopback Test Loop, Line Loop, Local Test, Remote Test, NI Loop, Cascade Digital Loop 552a V1.1 Loopback Test Loop, Line Loop, Local Test, Remote Test, NI Loop, Cascade Digital Loop 551 Loopback Test Loop, Line Loop, Local Test, Remote Test, NI Loop