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Thanks for the pointers.
Reviewing Annex 120D:
Table 120D–8 shows DER0 is 1e-5.
There is no BER spec. Instead, Table 120D–6 specifies a PCS symbol error ratio (SER) of 1e-4.
With precoding, BER=2*DER0. Without precoding, BER=DER0. But precoding is optional.
So it looks like this was overcome by specifying SER instead of BER.
SER=10*DER0, independent of precoding.
"J4 is defined as the time interval that includes all but 10–4 of
the jitter probability density distribution, ..."
Q4 is 3.8906.
But Q4=Q(3.8906) = 5e-5 which is inconsistent
Q4 should be 3.7 instead?
Same applies to 126.96.36.199.3.
Table 136-13 has a DER0 value of 1E-4.
136.1 specifies BER of 2.4E-4.
188.8.131.52 " ... BER better than 10–4".
On 03/21/2017 02:21 AM, Yang Zhiwei wrote: