Testing
T1 LoopbackT1 Network
ReceiveTransmit
LIU
FRAMER
CPU
ReceiveTransmit
CPE Device
Network or Remote Loopback
The incoming T1 signal is looped inside the T1 Framer and returned to the T1 Network. This exercises the T1 Line Interface Unit and the T1 Framer with the exception of the HDLC controller and clock switching circuitry.
Issue 1, September 1998
© 1998, ADC Telecommunications, Inc.
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T1 Network
ReceiveTransmit
LIU
FRAMER
CPU
ReceiveTransmit
CPE Device
Local Loopback
The outgoing T1 signal is looped inside the T1 LIU and returned to the CPE Device. This exercises the T1 Line Interface Unit, the T1 Framer, CPU, Data Port Interface, and the FXS Interface with the exception of the HDLC controller. The data ports can be exercised up to full T1 rate.