PM5364 pmc-sierra, PM5364 Datasheet - Page 95

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

10.5
10.5.1
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
Selection between working and protect links on the Line Ingress Serial RASIO™ CML links
can also be configured using the LIWSEL chip input pin. Changes in LIWSEL are also
synchronized to the second next frame boundary to provide hitless switchover. A top-level
register bit controls whether working/protect selection is done using the LIWTSEN outputs on
the STSI block or using the LIWSEL chip input.
When the Ingress Byte-Wide TelecomBus is used instead of the Line Ingress Serial RASIO™
CML links, then no working/protect selection is performed. Traffic from the STSI block used by
the Ingress Byte Wide TelecomBus is always selected.
High Order Path Overhead Subsystem
The High Order Path Overhead Subsystem is a complete communications subsystem that can be
realized as part of a single high-performance integrated circuit. The High Order Path Overhead
Subsystem terminates the path overhead of any legal mix of STS-1/3c/12c/48c
(VC-3/4/4-4c/4-16c) payloads in a SONET/SDH STS-48/STM-16 stream. This subsystem is
composed of four RTTP blocks, four RHPP_R blocks, one SARC-48 block, four THPP_R
blocks, and four TTTP blocks.
In the receive direction, the High Order Path Overhead Subsystem detects path alarm conditions
and detects and accumulates path BIPs (B3). It extracts Remote Error Indications (REIs) from
path status (G1), and monitors and accumulates path Remote Error Indications (REIs) for
performance monitoring. It accumulates and compares the 16 or 64 byte path trace (J1) message
against an expected result. It extracts the received path payload label (C2). All path overhead
bytes are extracted and serialized on lower rate interfaces, allowing additional external
processing of overhead if desired.
In the transmit direction, the High Order Path Overhead Subsystem creates and inserts the path
BIPs (B3), optionally inserts a 16 or 64 byte path trace (J1) message, optionally inserts the path
status byte (G1) and the path payload label (C2) byte into the transmit stream. In addition to its
basic processing of the transmit SONET/SDH path overhead, the High Order Path Overhead
Subsystem provides convenient access to all path overhead bytes, which are inserted serially on
lower rate interfaces, allowing additional external sourcing of path overhead if desired. The
High Order Path Overhead Subsystem also supports the insertion of a large variety of errors into
the transmit stream, such as framing pattern errors, pointer errors and BIP errors, which are
useful for system diagnostics and tester applications.
Receive High Order Path Processor (RHPP_R)
The Receive High Order Path Processor (RHPP_R) provides pointer interpretation, extraction of
path overhead, extraction of the synchronous payload envelope (virtual container), and path
level alarm and performance monitoring.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
95