Figure A-4. Ft1 Repeater Network And Cpe; Figure A-5. Fnid Network Loopback; Figure A-6. Fnid Cpe Loopback - ADTRAN Total Access 1500 FT1 DP Installation And Maintenance Manual

There are two loopbacks available to the FT1
Repeater:
• FT1 Repeater network loopback loops the
FT1 signal back toward the network.
• FT1 Repeater CPE loopback loops the FT1
signal back toward the customer.
The FT1 Repeater Network loopback is a digital
loopback toward the CO as shown in Figure A-4.
The loopback is initiated by the DDS latching
loopback code NEI Loopback 1 for repeater #1 or NEI
Loopback 2 for repeater #2 (N1000001). The NEI #1
or NEI #2 latching loopbacks are detected in the
primary DS0 of the FT1 circuit, the channel where the
FT1 DP is physically installed, to control the looping
of the FT1 circuit. When the FT1 circuit is looped, all
DS0s in use will be looped back toward the network.
AIS will be sent to the customer.
DSX-1
Interface
Central Office
Interface
Central
A-2
FT1 DP
D4
Channel Bank
Figure A-4. FT1 Repeater Network and CPE Loopbacks
DSX-1
Interface
FT1 DP
Central
Office
D4
Channel Bank

Figure A-5. FNID Network Loopback

DSX-1
FT1 DP
Office
D4
Channel Bank

Figure A-6. FNID CPE Loopback

Section 61180405L1-5, Issue 1
The FT1 Repeater CPE loopback is a digital loopback
toward customer premises as shown in Figure A-4.
This loopback is initiated by the Total Access 1500
craft interface, when available. When the FT1 circuit
is looped, all DS0s in use will be looped back toward
the customer. The DS0s will be transmitted toward
the network.
There are two loopbacks available to the FNID:
• FNID network loopback loops the FT1 signal
back toward the network:
• FNID CPE loopback loops the FT1 signal back
toward the customer.
The FNID network loopback is a digital loopback
toward the CO as illustrated in Figure A-5. This
loopback is initiated by the DDS latching loopback
code for NEI Loopback 1 (N1000001) for a
non-repeatered loop and for a repeatered loop or by
the craft interface.
HDSL
FT1
Repeater
#1 or #2
FNID
Local Loop
FNID
HDSL
Local Loop
FNID
HDSL
Local Loop
DS1
Interface
Customer Premises
DS1
Interface
Customer
Premises
DS1
Interface
Customer
Premises
61180405L1-5A