
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
113
Byte
Highest
Priority
Lowest
Priority
ENH4MASK=1)
Z3
UNEQV
(UNEQ=1)
Z3 pass through
(TDIS=1
OR
PAIS=1)
Z3 ind. reg.
(SRCZ3=1)
Z3 pass
through
Z4
UNEQV
(UNEQ=1)
Z4 pass through
(TDIS=1
OR
PAIS=1)
Z4 ind. reg.
(SRCZ4=1)
Z4 pass
through
Z5
UNEQV
(UNEQ=1)
Z5 pass through
(TDIS=1
OR
PAIS=1)
Z5 ind. reg.
(SRCZ5=1)
Z5 pass
through
14.14 SONET/SDH High-order Pointer Interpreter (SHPI)
The SONET/SDH High-order Pointer Interpreter (SHPI) block is analogous to the RHPP block
on the receive line side of the SPECTRA-9953. These blocks perform pointer processing by
identifying the location of the H1 and H2 bytes for any given STS-1/3c/12c/48c/192c
(AU3/4/4-4c/4-16c/4-64c) paths, and interpret the values in these bytes to locate the J1 path
overhead byte, and therefore the start of the path’s SPE. The SHPI also detects path alarm
conditions.
The SHPI block allows the ADD TelecomBus of the SPECTRA-9953 to accommodate two
methods of locating the SPE for a given STS-1/AU-3 path. One method is to mark the location
of the J1 byte with a special control character (refer to telecom bus encoder and decoder
blocks). This is accomplished when the SPECTRA-9953 or other serial TelecomBus devices are
configured for HPT mode (via the TMODE[1:0] bits in the T8TE Time-slot Configuration #1
and #2 registers for the SPECTRA-9953). With this mode, the SHPI can be bypassed and the J1
control character will indicate where the start of the SPE is for each STS-1/AU-3 path. The
other method is for the SHPI to perform pointer processing on the H1 and H2 bytes for each
STS-1/AU-3 path to locate the start of the SPE. This is required to support devices that cannot
provide the J1 control character.
14.15 SONET/SDH Virtual Container Aligner (SVCA)
The SONET/SDH Virtual Container Aligner (SVCA) block aligns the payload data from an
incoming SONET/SDH data stream to a new transport frame reference. The alignment is
accomplished by recalculating the STS (AU) payload pointer value based on the offset between
the transport overhead of the incoming data stream and that of the outgoing data stream.