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DS3 MONITOR AND TEST CARD OPERATION
The DS3 NIU MTC can pass both network and customer signals up to 450 feet. See illustra-
tion below. During normal operation, IN TO NTWK is internally connected to OUT FROM
CUST, and IN TO CUST is internally connected to OUT FROM NTWK. During test func-
tions the intrusive jack inserted into the DS3 MTC breaks the internal connection with its
corresponding jack and automatically terminates it at 75 ohms. In the tests described below
the test jacks inserted into the DS3 NIU MTC access the NIU3 backplane jacks for the net-
work or customer loops.
Warranty: ADTRAN will replace or repair this product within the warranty period if it does not meet its published specifications or fails while in service.
Warranty information can be found at www.adtran.com/warranty. U.S. and Canada customer Faxback: 877-457-5007, Document 414.
DS3 NIU Monitor and Test Card
DS3 Monitor and Test Card Configurations
NTWK
IN
Ω
464
Bypass
Relays
NTWK
on
TO
Mounting
CUST
MON
NTWK
IN
OUT
TO
NTWK
Ω
75
TO ACCESS:
Network to Customer path for nonintrusive
monitoring
NIU3 NTWK IN loop
NIU3 NTWK OUT loop
Customer to Network path for nonintrusive
monitoring
NIU3 CUST IN loop
NIU3 CUST OUT loop
Network To Customer Bypass
OUT
FROM
NTWK
CUST
Ω
93
Ω
75
Customer To Network Bypass
OUT
FROM
CUST
Ω
93
Ω
75
PRICING AND AVAILABILITY 800.827.0807
INSERT THE TEST JACK IN CONNECTOR LABELED:
NTWK TO CUST MON
DS3 MTC OUT FROM NTWK
DS3 MTC IN TO NTWK
CUST TO NTWK MON
DS3 MTC OUT FROM CUST
DS3 MTC IN TO CUST
CUST
IN
OUT
TO
Bypass
Relays
on
Mounting
Ω
75
CUST
IN
Ω
464
CUST
TO
NTWK
MON
TECH SUPPORT 800.726.8663
RETURN FOR REPAIR 256.963.8722
www.adtran.com
61212071L1-22C
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