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CSU SIGNAL MONITOR
INSERT TEST CABLE TO MONITOR CSU-TO-EQUIPMENT SIGNAL (PATH IS NOT BROKEN).
TEST EQUIPMENT RECEIVES CSU OUTPUT.
CSU SIGNAL INPUT
INSERT TEST CABLE TO BREAK EQUIPMENT-TO-CSU SIGNAL PATH.
PERMITS TEST EQUIPMENT TO TRANSMIT SIGNAL TO CSU.
CSU SIGNAL OUTPUT
INSERT TEST CABLE TO BREAK CSU-TO-EQUIPMENT SIGNAL PATH.
TEST EQUIPMENT RECEIVES CSU OUTPUT.
N E T W O R K
5 5 1
C S U
O N
S Y N N S L B B P V A I S
EQUIPMENT SIGNAL MONITOR
INSERT TEST CABLE TO MONITOR EQUIPMENT-TO-CSU SIGNAL (PATH IS NOT BROKEN).
TEST EQUIPMENT RECEIVES EQUIPMENT-SIDE OUTPUT.
EQUIPMENT SIGNAL OUTPUT
INSERT TEST CABLE TO BREAK EQUIPMENT-TO-CSU SIGNAL PATH.
TEST EQUIPMENT RECEIVES EQUIPMENT-SIDE OUTPUT.
EQUIPMENT SIGNAL INPUT
INSERT TEST CABLE TO BREAK CSU-TO-EQUIPMENT SIGNAL PATH.
PERMITS TEST EQUIPMENT TO TRANSMIT SIGNAL TO EQUIPMENT.
THIS CONNECTION IS BROKEN
WHEN A TEST CABLE IS
INSERTED INTO THE JACK.
RECEIVE
EQUIPMENT
SEND
TEST JACK
FIGURE 3-2. FRONT PANEL ACCESS TEST JACKS
OPERATION
IN
OUT
E Q U I P
E R R
C S U
0 ' S L A D N S T M
A L M
O U T
I N
OUT
IN
3-3
MON
CSU TEST JACKS
L T
S T
R T
E Q U I P
M O N
O U T
I N
EQUIPMENT-SIDE
TEST JACKS
MON
FRONT PANEL ACCESS
TEST JACKS
RECEIVE
SEND
DataComm
551
T1
NETWORK
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