ADTRAN DS3 NIU3 PM, Installation And Maintenance Practice

Page: 27 / 30

61213075L2-5E Issue 5, February 2011 27
Figure 29. Loopback Block Diagrams
AIS
Detector
RCV Framing
Detector
RCV LOS
Detector
Regen.
Ntwk Out
Ntwk In
Customer C-Bit/M13
Indication
Customer AIS
Indication
Customer LOS
Indication
Customer
Monitor
Network
To
Network
Monitor
Customer
To
RCV Framing
Detector
AIS
Detector
RCV LOS
Detector
Ntwk LOS
Indication
Ntwk AIS
Indication
Ntwk C-Bit/M13
Indication
Regen.
Cust In
Cust Out
Normal Operation Showing Bypass and Relays
AIS
Detector
RCV Framing
Detector
RCV LOS
Detector
Regen.
Ntwk Out
Ntwk In
Customer C-Bit/M13
Indication
Customer AIS
Indication
Customer LOS
Indication
Customer
Monitor
Network
To
Network
Monitor
Customer
To
RCV Framing
Detector
AIS
Detector
RCV LOS
Dectector
Ntwk LOS
Indication
Ntwk AIS
Indication
Ntwk C-Bit/M13
Indication
Regen.
Cust Out
Cust In
Network Loopback
Regen.
Ntwk Out
Ntwk In
Customer
Monitor
Network
To
Network
Monitor
Customer
To
RCV Framing
Detector
AIS
Detector
RCV LOS
Detector
Ntwk LOS
Indication
Ntwk AIS
Indication
Ntwk C-Bit/M13
Indication
Cust Out
Customer Loopback
Idle Code
Generator
RCV Framing
Detector
Cust C-Bit/M13
Indication
AIS
Detector
Customer AIS
Indication
RCV LOS
Detector
Customer LOS
Indication
Cust In
Regen.
Regen.
Ntwk Out
Ntwk In
Customer
Monitor
Network
To
Network
Monitor
Customer
To
RCV Framing
Detector
AIS
Detector
RCV LOS
Detector
Ntwk LOS
Indication
Ntwk AIS
Indication
Ntwk C-Bit/M13
Indication
Cust Out
Dual Loopback
AIS
Detector
Customer AIS
Indication
RCV LOS
Detector
Customer LOS
Indication
Cust In
Regen.
RCV Framing
Detector
Cust C-Bit/M13
Indication
I
II
III
IV
Network to customer bypass
Customer to network bypass