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DS1 LOOPBACK FUNCTIONS
A. DS1 NETWORK INTERFACE LOOPBACK FUNCTION
B. DS1 LINE LOOPBACK FUNCTION
C. DS1 TEST LOOPBACK FUNCTION
C
EQUIPMENT
B
CSU
DS1 LOOPBACK TESTS
A. DS1 LINE LOOP
B. DS1 TEST LOOP
B
A
EQUIPMENT
LOCAL CSU
C. DS1 LOCAL TEST
D. DS1 LOCAL TEST WITH SELF-TEST
TPR
TEST
EQUIPMENT
C
D
TPG
LOCAL CSU
E. DS1 NETWORK INTERFACE LOOPBACK
F. DS1 NETWORK INTERFACE LOOPBACK WITH SELF-TEST
TPR
TEST
EQUIPMENT
E
F
TPG
LOCAL CSU
G. DS1 REMOTE TEST (WITH LLB)
H. DS1 REMOTE TEST WITH SELF-TEST (WITH LLB)
TPR
TEST
EQUIPMENT
G
H
TPG
LOCAL CSU
I. DS1 REMOTE TEST (WITH TLB)
J. DS1 REMOTE TEST WITH SELF-TEST (WITH TLB)
TPR
TEST
EQUIPMENT
I
J
TPG
LOCAL CSU
DS1 END-TO-END SELF-TEST
TPR
EQUIPMENT
TPG
LOCAL CSU
TPG = TEST PATTERN GENERATOR
FIGURE 4-20. SUMMARY OF TESTS (Sheet 1 of 2)
T1
A
NETWORK
DS1 INTERFACE
CONNECTOR
T1
NETWORK
T1
NETWORK
T1
NETWORK
DS1 INTERFACE
CONNECTOR
T1
NETWORK
REMOTE CSU HAS LLB ENABLED
T1
NETWORK
REMOTE CSU HAS TLB ENABLED
T1
NETWORK
REMOTE CSU
TPR = TEST PATTERN RECOGNIZER
EQUIPMENT
CSU
TEST
EQUIPMENT
REMOTE CSU
EQUIPMENT
REMOTE CSU
EQUIPMENT
REMOTE CSU
EQUIPMENT
EQUIPMENT
TPG
EQUIPMENT
TPR
TESTS
4-25
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