Telecommunications Techniques Corporation interceptor 147, Reference Manual, Page: 82 / 280

3
Setup Categories
3-40
INTERCEPTOR 147 2 Mbit/s and Data Analyzer
3.6.1 Language
Use the Language item to select the language for the
menus, overlays, and printouts. The following selections
are available for LANGUAGE.
ENGLISH
Select ENGLISH to display menus in English.
<Local Language>
Select the appropriate available local language to
display menus in the local language (for example,
Francais).
3.6.2 Tx Coding
Set Tx Coding to specify the (line) coding to be used by the
transmitter.
Available when Transmitter is ON or when you are
conducting a MUX test (that is, transmitting a 2 Mbit/s
signal).
NOTE: The Tx Coding setup has no effect on receiver
operation. Instead, the receiver is always set up
to decode HDB3 “zero substitution” words when
they are detected. Thus the receiver is always
compatible with either the AMI code (which
does not contain zero substitution words), or the
HDB3 code (which does contain zero substitution
words).
The following selections are available for Tx Coding.
HDB3
HDB3 (High Density Bipolar 3) is a modified bipolar
code. With HDB3, whenever more than three
consecutive zeroes occur in the data, a substitution
word replaces the zeros (to ensure a high pulse density).
Therefore, 2 Mbit/s links using the HDB3 code can
carry data patterns with a low 1’s density.