
Data Sheet
June 2002
TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
419
Agere Systems Inc.
18 SPE Mapper Functional Description
(continued)
The C2 byte is stored in SPE_C2DMON[7:0] (
Table 162 on page 143
). This is updated after a number of consecu-
tive frames (determined by the value programmed in SPE_CNTDC2[3:0] (
Table 160 on page 142
)) of identical C2
bytes, i.e., the 8-bit pattern must be identical for the number of frames in the programmed SPE_CNTDC2[3:0] prior
to updating SPE_C2DMON[7:0].
Whenever the contents of the C2 byte monitor SPE_C2DMON[7:0] change, a delta bit SPE_C2DMOND
(
Table 156 on page 136
) is set and bit SPE_C2DMONM (
Table 157 on page 138
) is the interrupt mask bit.
The SPE mapper maintains a programmable expected value of the C2 byte in SPE_C2DEXP[7:0] (
Table 161 on
page 143
). If the current value of the C2 byte (SPE_C2DMON[7:0]) does not equal the expected C2 value
(C2DEXP[7:0]), then a payload label mismatch (PLM-P) defect is declared and reported in SPE_RPLM
(
Table 158
). The change in PLM-P state is reported in SPE_RPLMD (
Table 156
) with an interrupt mask bit
SPE_RPLMM (
Table 157 on page 138
).
Also, if the current value of the C2 byte (SPE_C2DMON[7:0]) is all zeros, then an unequipped (UNEQ-P) defect is
declared and reported in SPE_RUNEQ (
Table 158 on page 140
). The change in UNEQ-P state is reported in
SPE_RUNEQD (
Table 156 on page 136
) with an interrupt mask SPE_RUNEQM (
Table 157 on page 138
).
Table 550. C2MON Processing
18.14.5 Path User Byte F2 Monitor
The SPE mapper monitors the path user channel in the F2 byte. The current value of the F2 byte is stored in
SPE_F2DMON0[7:0] (
Table 162 on page 143
) after a number of consecutive frames (determined by the value pro-
grammed in SPE_CNTDF2[3:0] (
Table 160 on page 142
)) of identical F2 byte has been received, i.e., the 8-bit pat-
tern must be identical for a number of frames equal to the value of SPE_CNTDF2[3:0]
prior to updating
SPE_F2DMON0[7:0].
Whenever the contents of the F2 byte monitor (SPE_F2DMON0[7:0]) change, a delta bit SPE_F2DMOND
(
Table 156 on page 136
) is set. The interrupt mask is SPE_F2DMONM (
Table 157 on page 138
).
The SPE mapper maintains a history of the previous valid F2 byte in SPE_F2DMON1[7:0] (
Table 162 on
page 143
).
Name
Function
SPE_C2DMON[7:0] (
Table 162 on page 143
)
SPE_C2DEXP[7:0] (
Table 161 on page 143
)
SPE_CNTDC2[3:0] (
Table 160 on page 142
)
SPE_C2DMOND (
Table 156 on page 136
)
SPE_C2DMONM (
Table 157 on page 138
)
SPE_RPLM (
Table 158 on page 140
)
SPE_RPLMD (
Table 156 on page 136
)
SPE_RPLMM (
Table 157 on page 138
)
SPE_RUNEQ (
Table 158 on page 140
)
SPE_RUNEQD (
Table 156 on page 136
)
SPE_RUNEQD (
Table 157 on page 138
)
C2 Current Data Monitor.
Expected Value of C2 Byte.
Continuous Times Detect Count Value for C2.
C2 Data Monitor Event Bit.
C2 Data Monitor Mask Bit.
Payload Label Mismatch State.
Payload Label Mismatch Delta Bit.
Payload Label Mismatch Mask Bit.
Unequipped Path State.
Unequipped Path Delta Bit.
Unequipped Path Mask Bit.