10 | 09 (Note\ 1) (405) (Note\ 2) ON Ternary (Note\ 2) OFF Ternary (Note\ 2)
.TE
.LP
PRBS
stand for a 511\ bit pseudo\(hyrandom binary sequence generated by
the polynomial (1\
\o'\(ci+'\ \fIx\fR
\uD\dlF261\u4\d\
\o'\(ci+'\ \fIx\fR
\uD\dlF261\u9\d).
.LP
\fINote\ 1\fR
\ \(em\ The transmission of ternary data from the LT to the NT1 from this
time onwards in continuous. The NT1 will not return ternary data until it has achieved synchronisation, the figure of 405 bauds and the subsequent offset
to the next row is intended as a guide to the normal duration for this
process.
.LP
\fINote\ 2\fR
\ \(em\ Ternary transmission from NT1 to LT implies that error\(hyfree
transmission and frame synchronisation have been achieved in the NT. Following the LT acquiring synchronisation, full duplex 2B | | transmission can
commence.
.nr PS 9
.RT
.ad r
\fBTableau VI\(hy2/G.961 [T39.961], p\fR
.sp 1P
.RT
.ad b
.RT
.PP
The conditional step between the NT1 acquiring synchronisation and returning
ternary data is included to provide a mechanism by which the optional alignment
of LT to NT1 and NT1 to LT frame words can be achieved.