The EdgeAccess Universal Chassis System
2361 Modem Users Manual
5-3
5.4 Loopback and Bit Error Rate Testing
The Diagnostics Screen, as shown in Figure 31, can be accessed from both the standalone and
rackmount modems. Diagnostic testing can be performed on the local modem and its secondary
redundant partner. Remote modems show the status of the diagnostic performed.
Figure 33. Diagnostics Screen Provides Access to BERT and Loopback Testing
From the Modem Main Menu type "2" to access the Diagnostic screen. The Modem Diagnostics
Screen reports BERT status (Sync Status, Error Rate, Count, Sync Count, and Up Time), as well
as Looopback tests.
Active options are accessed by typing 1 through 4.
1.
Loopback:
Use the space bar to toggle through the following loopback options:
•
Local
Local electrical interface looped back, AIS sent on the Fiber Optic
towards the remote modem
•
Remote
Loopback at the remote unit on the fiber optic side. Remote unit is
also sending AIS out the electrical interface
•
Remote BERT
Loopback at the remote unit on the fiber optic side. Remote unit is
also sending AIS out the electrical interface. Local unit sends a
QRSS pattern towards the remote unit and monitors the received
pattern. This pattern is sent from the LIU chip and uses the full T1
or T1 bandwidth in unframed mode, AMI coding. The local unit is
also sending AIS out the electrical interface
•
Local BI
Local electrical interface looped back. Local signals looped back on
the fiber side as well. In a Bi-directional Loopback (Local BI and
Remote BI), data is looped back in both directions, assuring a stricter
standard of error checking.
Summary of Contents for EdgeAccess Universal Chassis System 2361 T1
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