aurora
Sonata
Hand Held ISDN Tester—User Guide
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Checking the protocol activity
When aurora
Sonata
detects protocol information being passed
along the line, the Line A LED shows yellow for as long as the
information is present.
During a call, aurora
Sonata
displays a simple decode of the
protocol information. To view this, press
to activate the
Decode window in the Connected menu. For example:
For more detailed analysis, you can send the protocol
information to aurora
Sonata
’s serial port or save it to memory. See
Chapter 7 section 1 for instructions.
Notes
• There can be no protocol activity unless Layer 1 is active
(i.e. the Line A LED must be green).
• Layers 2 and 3 must be active before the protocol
information can be passed along the line.
Detecting NEBE/FEBE (2B1Q)
aurora
Sonata
can detect internal errors on the U interface when
2B1Q line coding is being used. Far End Block Errors (FEBE)
are errors in the transmit direction, and Near End Block Errors
(NEBE) are errors in the receive direction.
The CRC LED indicates NEBE/FEBE by lighting up red for as
long as the error is present on the line.
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