ADC ICX-250 - Manual (Page 57)

54 ICX-250 Diagnostics Testing
ADCP-62-023 Issue 1, September 1998
© 1998, ADC Telecommunications, Inc.
T1 Interface - T1 Loopback ( Slide switch - front )
ICX-250 - Front Panel
Description: This is a three position slide switch used to operate the T1 Interface Loopback.
Factory Setting: OFF
Network: Loops signal back to the network and breaks the transmit and receive paths between the
Framer and LIU and Loops the T1 receive onto the T1 transmit within the Framer chip.
Local: Loops signal back to the network and breaks the transmit and receive paths between the
LIU and the line and loops the T1 transmit signal onto the T1 receive within the LIU.
Note: When operating the QRSS switch the
T1 Loopback switch will be inoperative.
ICX-250
1 3 5 7 9 11 13 15 17 19 21 23
2 4 6 8 10 12 14 16 18 20 22 24
FXS Status Channel
Data Loop 2
Lcl. / Off / Net.
Data Loop 1
Lcl. / Off / Net.
T1 Loop
Net. / Off / Lcl.
T1 Loop
Net. Off Lcl.
NETWORK
1 / Off / 2 Off / QRSS
T1 Status T1 Loop Test Pattern Test Pattern T1 T
est
Self Check
11279-A
T1 Loop
Net. Off Lcl.
LOCAL
T1 Loop
Net. Off Lcl.
OFF