Testing

Data Port 1 and 2 Loopback

T1 Network

ReceiveTransmit

ICX-250

LIU

FRAMER

CPU

ReceiveTransmit

CPE Device

Data Port 1 and 2

Network or Remote 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.

Issue 1, September 1998

© 1998, ADC Telecommunications, Inc.

ICX-250 Diagnostics

59

T1 Network

ReceiveTransmit

ICX-250

LIU

FRAMER

CPU

ReceiveTransmit

CPE Device

Data Port 1 and 2

11278-A

Local Loopback

The Data Port interface signal is looped inside the CPU and returned to the data port interface. Subsystems CPU and Data Port interface are exercised.

ADCP-62-023