General DataComm 551 Operating And Installation Instructions page 104

EQUIPMENT
FIGURE 4-10. DS1 REMOTE TEST WITH LINE LOOPBACK
EQUIPMENT
FIGURE 4-11. DS1 REMOTE TEST WITH TEST LOOPBACK
CSU OUT
CSU IN
LOCAL CSU
IN OUT
TEST
EQUIPMENT
CSU OUT
CSU IN
LOCAL CSU
IN OUT
TEST
EQUIPMENT
T1
NETWORK
REMOTE CSU HAS LLB ENABLED
T1
NETWORK
REMOTE CSU HAS TLB ENABLED
TESTS
EQUIPMENT
AIS
EQUIPMENT
AIS
4-13