ADC ICX-250 - Manual (Page 62)

Testing ICX-250 Diagnostics 59
Issue 1, September 1998 ADCP-62-023
© 1998, ADC Telecommunications, Inc.
Data Port 1 and 2 Loopback
Network or Remote Loopback Local Loopback
The selected DS0s are looped back
after leaving the Framer before
reaching the CPU. The CPU is used
to control this loopback via the TSA.
Subsystems T1 Line Interface Unit,
T1 Framer, and CPU are exercised. The Data Port interface signal is
looped inside the CPU and returned
to the data port interface. Sub-
systems CPU and Data Port inter-
face are exercised.
T1 Network
ICX-250
Transmit Receive
FRAMER
LIU
CPU
CPE Device
Data Port 1 and 2
11278-A
T1 Network
ICX-250
Transmit Receive
Transmit Receive Transmit Receive
FRAMER
LIU
CPU
CPE Device
Data Port 1 and 2