GTS1063 and GTS1250 GBIC Test Systems Instruction Manual
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Appendix A: GTS1250 Long and Short Patterns
This appendix displays the SHORT and LONG patterns.
The IEEE 802.3 patterns
The IEEE 802.3 standard (1998 edition) describes the LONG and SHORT
continuous random test patterns in section Annex 36A. The standard lists the
patterns in HEX format prior to 8B-10B encoding and also prior to insertion of
the packet encapsulation delimiter. The GTS1250 generates these LONG and
SHORT patterns as they would appear on the physical layer after 8B-10B
encoding and with proper packet encapsulation.
Tables 23 and 24 describe the sequential bit sequence of the LONG and SHORT
patterns. The tables are arranged such that the time domain occurrence of the bits
is from left to right, and top to bottom. The tables are divided into groups of
three rows which contain the information shown in Figure 39.
Code group name (octet value) row
10B code group sequence row
BERT hex row
Figure 39: Long Pattern and Short Pattern table format
This row lists the code groups transmitted in time domain order (from left to
right, top to bottom). The Octet value (8-bit HEX prior to 8B10B encoding) of
the code group is listed in parenthesis.
This row lists the individual bit sequence in the pattern in time domain order
(from left to right, top to bottom). The 10-bit code groups are broken into 4-bit
sequences for the convenience of programming Bit Error Rate Test (BERT)
receivers; the 4-bit fields allow you to better fit the 10B data sequence into such
byte-oriented equipment.
Table Formats
Code Group Name
(Octet Value)
10B Code Group
Sequence
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