Preliminary Data Sheet
May 2001
TMXF28155/51 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
383
Agere Systems Inc.
17 TMUX Functional Description
(continued)
Signal degrade is cleared when a number of good monitoring blocks equals or exceeds the threshold in
TMUX_SFMCLEAR[7:0] (
Table 121
) for the measurement interval.
The set parameters are used when the signal fail state is clear, and the clear parameters are used when the signal
fail state is declared.
The signal degrade state may be forced to the declared state with TMUX_SFSET (
Table 78
) and forced to the
cleared state with TMUX_SFCLEAR (
Table 78
). One shot signal must be provided to force the BER algorithm into
the failed state or normal state, respectively.
The above algorithm can detect bit error rates from 1 x 10
–
3
to 1 x 10
–
9
.
Table 527. Signal Fail Parameters
Note: The thresholds written by the control system will be one less than the desired number, except for the TMUX_SFLSET[3:0] and
TMUX_SFLCLEAR[3:0] parameters.
Name
Function
TMUX_SFNSSET[18:0] (
Table 121
)
TMUX_SFLSET[3:0] (
Table 121
)
Signal Fail Ns Set.
Number of frames in a monitoring block for SF.
Signal Fail L Set.
Error threshold for determining if a monitoring block is
bad.
Signal Fail M Set.
Threshold of the number of bad monitoring blocks in
an observation interval. If the number of bad blocks is below this thresh-
old, then SF is cleared.
Signal Fail B Set.
Number of monitoring blocks.
Signal Fail Ns Clear.
Number of frames in a monitoring block for SF.
TMUX_SFMSET[7:0] (
Table 121
)
TMUX_SFBSET[15:0] (
Table 121
)
TMUX_SFNSCLEAR[18:0]
(
Table 121
)
TMUX_SFLCLEAR[3:0] (
Table 121
)
Signal Fail L Clear.
Error threshold for determining if a monitoring block
is bad.
Signal Fail M Clear.
Threshold of the number of bad monitoring blocks in
an observation interval. If the number of bad blocks is below this thresh-
old, then SF is cleared.
TMUX_SFMCLEAR[7:0] (
Table 121
)
TMUX_SFBCLEAR[15:0] (
Table 121
)
Signal Fail B Clear.
Number of monitoring blocks.
TMUX_SFB1B2SEL (
Table 95
)
Signal Fail B1/B2 Error Count Select.
Control bit, when set to a logic 0,
causes the signal fail bit error rate algorithm to use B1 errors; when set to
a logic 1, causes the signal fail bit error rate algorithm to use B2 errors.
TMUX_SFSET (
Table 78
)
Signal Fail Set.
Allows the signal degrade algorithm to be forced into the
failed state (active 0 to 1).
TMUX_SFCLEAR (
Table 78
)
Signal Fail Clear.
Allows the signal degrade algorithm to be forced into
the normal state. (active 0 to 1).
TMUX_RHSSF (
Table 91
)
Signal Fail BER Algorithm State Bit.
TMUX_RHSSFD (
Table 82
)
Signal Fail BER Algorithm Delta Bit.
TMUX_RHSSFM (
Table 86
)
Signal Fail BER Algorithm Mask Bit.