Telecommunications Techniques Corporation interceptor 147, Reference Manual, Page: 83 / 280

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INTERCEPTOR 147 2 Mbit/s and Data Analyzer
Setup Categories
AMI
AMI (Alternate Mark Inversion) is a bipolar code
with no zero substitution.
3.6.3 Error Type
Use the Error Type item to specify the type of errors to be
transmitted when ERROR INSERT is pressed. The
following selections are available for Error Type.
LOGIC
Inserts logic (or bit) errors into the data portion of the
transmitted signal prior to encoding. (A bit error
occurs when a “1” is mistakenly transmitted as a “0,”
or vice versa.) The receiving test equipment should
detect bit errors. When FAS-CRC or MFAS-CRC
framing is used, the receiving test equipment should
also detect CRC errors.
CODE
Inserts code errors (bipolar violations) into the data or
overhead portion of the transmitted signal. To ensure
that no bit errors are caused, code errors are inserted
such that they do not fall within HDB3 zero substitution
words.
FAS
Inserts logic errors into the FAS (word error). See
also the Adjacent FAS Errs item.
3.6.4 Error Rate
Use the Error Rate item to select the injected error rate
(1E-3 or 5E-3) that you want the transmitter to transmit
when you press ERROR INSERT. This item is available
when the Error Type item is set to LOGIC or CODE.