PM5364 pmc-sierra, PM5364 Datasheet - Page 132

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

10.8.2
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
The SHPI can interpret the STS/AU pointers of an STS-12/STM-4 SONET/SDH transport
frame. The input is an eight bit serial stream at 77.76 MHz. Four SHPIs can be used to locate
the STS SPE (VC) payloads in a STS-48 (STM-16) SONET/SDH transport frame.
The STS SPE (VC) payloads are independently floating inside the transport frame and the SHPI
must interpret each of the STS-1/3c/12c (AU3/4/4-4c) pointers in order to locate the boundaries
of the payloads; i.e. the path trace bytes (J1). Once the STS SPE (VC) payloads are located, the
SHPI indicates the location of each path trace byte. The SHPI also indicates the location of the
STS-SPE (VC) payloads and of the path overhead bytes.
The SHPI provides an interrupt output to indicate a pointer justification event, a path loss of
pointer, a path alarm indication signal or a BIP error in the STS SPE (VC) payloads. An internal
register can be read to identify the interrupt source. Each interrupt source is individually mask-
able.
The SHPI blocks in the egress path of TUPP 2488 are needed to indicate the J1 position to the
egress byte-wide TelecomBus.
Pointer Interpreter
See 10.5.1 for Pointer Interpreter description.
Concatenation Pointer Interpreter State Machine
See 10.5.1 for Concatenation Pointer Interpreter State Machine description.
Egress SONET/SDH Virtual Container Aligner (Egress SVCA_R)
The SVCA aligns the transport overhead of an STS-12 stream to a new reference signal. The
alignment is accomplished by recalculating the STS payload pointer value based on the offset
between the transport overhead of the incoming and outgoing streams. It inserts valid high order
pointer bytes (H1, H2), framing bytes (A1, A2), and otherwise all-zero transport overhead bytes.
Multiple SVCA can be used to process higher concatenated payloads (STS-48c/VC4-16c). An
STS-48c/VC-4-16c is processed by four SVCA. The first SVCA is master and the three others
are slaves.
Outgoing pointer justification events are indicated on two separate outputs. A slave SVCA uses
one of these outputs to perform the required justification when a concatenated
STS-48c/STM-16c is processed. The other set of outputs can be used for performance
monitoring. Excessive pointer justification events may indicate network synchronization failure.
Finally, the SVCA provides pointer justification performance counters for each path.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
132