CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
47
Table 3-2. OOF, LOF, and LOS Detection Conditions
Detection Condition
Termination Condition
OOF If a frame synchronization pattern cannot be
detected in
α
forward protection stages in a row.
If a frame synchronization pattern is detected
δ
backward protection stages in a row
LOF
If the OOF status lasts for 3 ms.
If the
LOFDT bit of the MDSOHR register is 0, the
LOF status is detected at the same time as OOF.
If the
µ
PD98413 is not in the OOF status for 3 ms.
If the LOFDT bit of the MDSOHR register is 0, the
LOF status is terminated at the same time as OOF.
LOS
If the signals input to RDIT do not change in level
for 25
µ
s (if the CDO bit of the MDSOHR register
is 1, the LOS status is reported when the CD pin
goes low.)
The
µ
PD98413 is able to select the LOS termination
condition, Bellcore mode or ANSI mode, by the LOST
bit of the MDSOHR register.
Bellcore Mode:
If the incoming signal has two consecutive valid
framing alignment patterns, and no pulse-free
intervals for 25
µ
s consecutive time between that tow
consecutive valid framing.
ANSI Mode:
If the incoming signal that have no pulse-free
intervals of 25
µ
s for 125
µ
s.
*If the CD pin is High for above termination condition
25
µ
s consecutive time. (If include CD pins input for
this termination condition (CDO bit of the MDSOHR
register is 1),)
(2) Descramble of receive frame
After frame synchronization has been established, the received frame is descrambled with the polynomial shown
below. The entire range of the STS-12c frame, except the 36 bytes from the beginning, "A1 (12), A2 (12), J0 (1),
Z0 (11)" is descrambled.
Polynomial G (X) = 1 + X
6
+ X
7
An option mode that disables descrambling of a frame is provided for testing purposes. This mode is set by
using the FSCM Bit of
the MDSOHR register.
Содержание NEASCOT-P65
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