TMXF28155/51 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Preliminary Data Sheet
May 2001
394
Agere Systems Inc.
17 TMUX Functional Description
(continued)
An APS babbling test is controlled with TMUX_TAPSBABINS (
Table 116 on page113
). Setting
TMUX_TAPSBABINS = 1 forces the K1[7:0], K2[7:3) to an inconsistent state; no three consecutive values are con-
tinuously the same.
When the transmit K2 software insert bit TMUX_THSK2INS = 1 (
Table 107 on page103
), data from bits
TMUX_TK2INS[2:0] (
Table 113 on page110
) is written into the K2[2:0] output bits. When TMUX_THSK2INS = 0,
hardware insertion of RDI-L is enabled.
17.6.20 Criteria for Insert Line RDI
Hardware insertion of line RDI is generated using the following equation. Each defect contribution to line RDI can
be individually inhibited.
(TMUX_RILOC AND TMUX_TRILOC_LRDIINH) OR
(TMUX_RHSLOS AND TMUX_TRLOS_LRDIINH) OR
(TMUX_RHSLOF AND TMUX_TRLOF_LRDIINH) OR
(TMUX_RHSOOF AND TMUX_TROOF_LRDIINH) OR
(TMUX_RLAISMON AND TMUX_TRLAISMON_LRDIINH) OR
(TMUX_RHSSF AND TMUX_TRSF_LRDIINH) OR
(TMUX_RHSSD AND TMUX_TRSD_LRDIINH)
When a failure condition exists that will cause RDI-L to be generated, the generation of RDI-L must last for at least
20 frames before clearing, even if the original failure cause has cleared in less than 20 frames.
The TMUX provides a protection switch MUX for RDI-L insertion. The MUX is controlled by TMUX_TLREIRDISEL
(
Table 107
). If TMUX_TLREIRDISEL = 1, then the RDI-L value for insertion is taken from the value on the protec-
tion board rather than from the receive side of the same TMUX.
17.6.21 Line AIS Generation
Line AIS is specified as all ones in the entire STS/STM signal before scrambling, excluding the section overhead.
Line AIS can be generated by setting TMUX_THSLAISINS = 1 (
Table 107
).
17.6.22 B2 BIP-8 Calculation and Insert
The B2 byte is allocated for a line overhead error monitoring function. This function will be a bit interleaved parity-8
code (BIP-8) using even parity. The BIP-8 is computed before scrambling, over all the bits of the previous STS-1
frame (except for the 9 bytes of section overhead) and is placed in byte B2 of the current frame also before scram-
bling.
A bit error rate can be inserted on any B2 byte. When bit(s) TMUX_THSB2ERRINS[1
—
3] (
Table 115 on page112
)
is (are) asserted, the corresponding B2 byte is inverted each time the microprocessor interface block
SMPR_BER_INSRT (
Table 65 on page66
) bit is asserted.
17.6.23 F1 Byte Insert
When TMUX_THSF1INS = 1 (
Table 107 on page 103
), the value in TMUX_TF1INS[7:0] (
Table 112 on page 110
) is
inserted into the F1 byte of the outgoing signal. Otherwise, the associated TOAC value is inserted when
TMUX_TTOAC_F1 = 1 (
Table 117 on page113
). If both TMUX_THSF1INS and TMUX_TTOAC_F1 = 0, then the
value inserted depends on the value of microprocessor interface block SMPR_OH_DEFLT (
Table 67 on page 68
)
bit. If SMPR_OH_DEFLT = 0, then all 0s are inserted. If SMPR_OH_DEFLT = 1, then all ones are inserted.