General DataComm 551 Operating And Installation Instructions page 94

LOCAL CSU
PROBLEM
LOCAL EQUIPMENT OR EQUIPMENT-CSU
CONNECTION PROBLEM
LOCAL CSU OR CSU-LINE
CONNECTION PROBLEM
LOCAL CSU
PROBLEM
COMMUNICATION LINE OR LINE-CSU
CONNECTION PROBLEM
REMOTE CSU OR
EQUIPMENT PROBLEM
REMOTE CSU
PROBLEM
REMOTE EQUIPMENT OR EQUIPMENT-CSU
CONNECTION PROBLEM
FIGURE 4-1. TROUBLE DIAGNOSTIC FLOWCHART
START
PERFORM
LOCAL TEST WITH SELF-TEST
FAIL PASS PASS
PERFORM
OR
LOCAL TEST
FAIL?
FAIL PASS PASS
PERFORM
OR
LINE LOOP
FAIL?
FAIL PASS PASS
PERFORM
OR
TEST LOOP
FAIL?
PERFORM REMOTE TEST OR REMOTE TEST
FAIL PASS PASS
WITH SELF-TEST, WITH LINE LOOPBACK
OR
FUNCTION ENABLED IN REMOTE CSU
FAIL?
FAIL PASS PASS PERFORM REMOTE TEST OR REMOTE TEST
WITH SELF-TEST, WITH TEST LOOPBACK
OR
FUNCTION ENABLED IN REMOTE CSU
FAIL?
FAIL PASS PASS
PERFORM LOCAL TEST WITH
OR
SELF-TEST AT REMOTE CSU
FAIL?
FAIL PASS PASS
PERFORM LOCAL TEST
OR
AT REMOTE CSU
FAIL?
FAIL PASS PASS
NO SYSTEM PROBLEM
OR
FAIL?
TESTS
4-3