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SONET_Usr.bk Page 203 Wednesday, December 13, 2000 11:11 AM
Table 4
Foreground
TU-12 (2 Mb/s)
Unframed
TU-11 (DS1)
Unframed
STS-1 SPE Background Patterns
Foreground
STS-1 SPE
VT-6
VT-2 (2 Mb/s)
Unframed
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Background Patterns
TUG-3 Background Patterns
Background choice in
Foreground TUG-3
TU-12 structure, unframed with 2E15-1,
2E9-1 PRBS or 1100 word pattern in all
information bits.
TU-11 structure, D4 framed DS1 with
2E15-1, 2E9-1 PRBS or 1100 Word
pattern in other TU-11s.
SONET Operation
Background choice in
Foreground TUG-3
---------
Pattern in other VT-6s is numbered.
They contain the word 11NNNNNx,
where NNNNN is the binary number of
the TU.
VT-2 structure, unframed with 2E15-1,
2E9-1 PRBS or 1100 word pattern in all
information bits.
Background choice in
other TUG-3s
TU-12, TU-11 Mapping or
TU-3 Word (8 bit user
programmable word).
TU-12, TU-11 Mapping or
TU-3 Word (8 bit user
programmable word).
Background choice in
other AU-3
VT-1.5, VT-2 Mapping or
SPE Word (8 bit user
programmable word).
VT-1.5, VT-2 Mapping or
SPE Word (8 bit user
programmable word).
VT-2, VT-1.5 Mapping or
SPE Word (8 bit user
programmable word).
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