PM5316 Datasheet, PDF (416/491 Pages) PMC-Sierra, Inc – Quad Channel 155 Mbit/s SONET/SDH Framer and Aligner

SONET/SDH Payload Extractor/Aligner (SPECTRA-4x155)
Production
13.2.2
Z1:
The Z1 bytes are allocated for future growth.
In the transmit direction, the SPECTRA-4x155 TTOC and TLOP blocks provide register
control for the growth bytes. TTOC always has priority over the TLOP. TTOH can also be
used to set the Z1 byte.
In the receive direction, the SPECTRA-4x155 provides access to all growth bytes via the
RTOH port.
M1:
The M1 byte provides for line remote error indictions.
In the transmit direction, the SPECTRA-4x155 the M1 byte is internally generated. The
number of B2 errors detected in the previous interval is insert. The insertion may be
overwritten via the TTOH or Transmit Ring control port. The TTOH has priority ove the
TRCP.
In the receive direction, a legal M1 byte value is added to the line REI (FEBE) event
counter in the RSOP block.
Z2:
The Z2 bytes are future growth.
In the transmit direction, Z2 can be inserted with the TTOH port or programmed to be
processed by the TTOC.
In the receive direction, Z2 bytes are extracted and made availble on the RTOH port.
Path Overhead Bytes
All receive path overhead bytes are extracted and presented onto the RPOH port.
Proprietary and Confidential to PMC-Sierra, Inc. and for its customers’ internal use
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Document ID: PMC-1990822, Issue 4