PM5364 pmc-sierra, PM5364 Datasheet - Page 118

• Manufacturer Part Number: PM5364
• Description: Tupp 2488 Assp Telecom Standard
• Manufacturer: pmc-sierra

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
Payload Signal Label Processing
The RTOP336 processes the payload signal label (PSL) and detect payload label unstable
(PSLU), payload mismatch (PSLM), payload defect indication (PDI), and payload unequipped
defects. The PSL value is extracted from the C2 byte when the tributary is in TU3 mode, from
V5 byte bit 5-7 when the tributary in non-TU3 mode, and from K4 bit 1 when the tributary is in
extended PSL mode. Since the Telcordia and ITU-T standard have different requirements, both
algorithms are defined and can be selected with the PSLMODE register bit.
The PSL3 configuration bit determines the PSL threshold value (n) of both the Telcordia and
ITU-T algorithm. When PSL3 is set to logic 0, n = 5, and when PSL3 is set to logic 1, n = 3.
Telcordia Standard Algorithm:
The Telcordia algorithm detects payload mismatch (PSLM) defect, path unequipped (UNEQ)
and tributary payload defect indications (PDIV) from the PSL pattern in tributary overhead
bytes. The PSLM, UNEQ, and PDIV defects are reported via the tributary status registers.
The concept of persistent or accepted PSL is not defined in the Telcordia algorithm, so no PSLU
defect will be declared. (PSLU is set to logic 0) The accepted payload signal label register bits
(APSL[7:0]) are irrelevant when using this algorithm. The APSL will still be updated according
to the ITU-T algorithm.
According to Table 14, the Telcordia algorithm declare a PSLMV alarm when the received PSL
is defined as mismatch for n consecutive (multi-)frames. The algorithm removes the PSLMV
alarm when the received PSL matches is defined as mismatch for n consecutive (multi-)frames.
The expected PSL is a static 8-bit pattern written by an external microprocessor. In non-TU3
mode, the 3 bit EPSL is zero padded to form a 8 bit EPSL. The Telcordia standard does not
specify extended PSL mode, therefore EXTDPSL must set to logic 0 when using this algorithm.
Table 14 also shows that the Telcordia algorithm declares an UNEQV alarm when the received
PSL is defined as unequipped for n (multi-)frames. The algorithm removes the UNEQV alarm
when the received PSL is defined as not unequipped for n consecutive (multi-)frames.
Finally, Table 14 illustrates that the Telcordia algorithm declares the PDIV alarm when PDIV
defects are reported by the received PSL for n consecutive (multi-)frames. The algorithm
removes the PDIV when PDIV defects are not reported by the received PSL for n consecutive
(multi-)frames or the expected PDI code value is changed to “00000”. The expected PDI code
consists of a static 5bit pattern written by the microprocessor.
In the Telcordia standard, PSL code FF in TU3 mode and 07 in non-Tu3 mode is marked as
reserved value and requires special attention. Receiving the reserved PSL code will not cause
any changes in the existing PSLMV, UNEQ and PDIV status.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
118