Data Sheet
June 2002
TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
12 28-Channel Framer Registers (continued)
Table 397. FRM_PMLR4, Performance Monitor Link Register 4 (COR) (continued)
Address* Bit
Name
Function
Reset
Default
0x8LP83
5
4
FRM_CRCTX
CRC-4 Multiframe Alignment Timer Expired. A 1 indicates
that either the 100 ms or the 400 ms interworking timer expired.
It is only active immediately after basic frame alignment is found
in CEPT CRC-4 modes. This signal is set when the error
occurs, and is cleared when it is read if there is not another
error during the read.
0
FRM_LTS0MFA Loss of Time Slot 0 CRC-4 Multiframe Alignment. A 1 indi-
cates the absence of CRC-4 multiframe alignment. This bit is
set when basic frame alignment has been found and multiframe
alignment is being searched for, or when multiframe alignment
is lost but basic frame alignment remains good, or when multi-
frame alignment is lost.
0
Note: This is a stored version of the status. It is cleared after
one good multiframe bit is seen.
CRC-4 multiframe alignment is assumed lost when there are
three consecutive errors in the CRC-4 multiframe alignment bits
(bit 0 of NOTFAS frames 1, 3, 5, 7, 9, and 11). Loss of CRC-4
multiframe alignment may optionally cause a research for
CRC-4 multiframe alignment without affecting the current basic
frame alignment.
CEPT with CRC-4 only. In all other modes, this bit is a 0.
3
2
FRM_TS0MFABE Time Slot 0 Multiframe Alignment Signal Bit Error. A 1
indicates that the receive framer detected an error in the CRC-4
multiframe alignment signal. A 0 indicates no errors. Bit 0 of
NOTFAS frames (1, 3, 5, 7, 9, and 11).
0
0
FRM_SES
Severely Errored Second (G.826 Annex B). A 1 indicates the
receive framer detected a severely errored second. The events
that can cause an errored second are provisionable for DS1
links in Table 329 and for CEPT links in Table 332. The
severely errored second threshold is provisionable; DS1-SF
links in Table 326 on page 252, DS1-ESF links in Table 328 on
page 253, and CEPT links in Table 331 on page 253.
* See Table 393 on page 279 for values of L and P.
Agere Systems Inc.
285
ETC [ ETC ]
