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SONET_Usr.bk Page 71 Wednesday, December 13, 2000 11:11 AM
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Setting the Interfaces - SONET Operation
Setting Receive Interface
The ITU-T O.150 standard specifies that the NORMAL or default for all PRBS
patterns should be inverted. This will produce a longest string of n-1 consecutive
n
zeros in a 2
-1 PRBS pattern. Therefore selecting INVERT with an ITU-T pattern
will produce a longest string of n-1consecutive ones in a 2
The ITU-T definition also applies in the US, except for 2
patterns. Through common practice, NORMAL indicates that the PRBS pattern
is non-inverted. Therefore when the 'US' PRBS polarity control is enable and
NORMAL is selected for these two patterns on the TRANSMITTER, a longest
string of n-1 consecutive ones is produced. The pattern has to be INVERTed in
order to produce a longest string of n-1 consecutive zeros.
n
-1 pattern.
15
23
-1 and 2
-1 PRBS
71
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