PM5361-RI PMC-Sierra, Inc., PM5361-RI Datasheet - Page 76

• Manufacturer Part Number: PM5361-RI
• Description: SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR
• Manufacturer: PMC-Sierra, Inc.

DATA SHEET
PMC-920526
12
12.1 Configuration Options
OPERATION
The TUPP consists of three tributary payload processors or TPPs. Each TPP
deals with a portion of the SONET frame that corresponds to an STS-1 SPE.
Equivalently, each TPP deals with a portion of the SDH frame that corresponds
to a VC3 together with the 2 columns of fixed stuff that are added when mapping
a VC3 into an AU3. By coordinating the operation of the three TPPs, they can
process the portion of an SDH frame that corresponds to a VC4. The
coordination that may be required between the three TPPs relates to the J1 byte
marker and the encoding of the tributary multiframe into the H4 byte. When
processing a VC4 that carries three TUG3s, the alignment provided by the J1
byte marker and the H4 byte of the VC4 must be distributed to all TPPs. When
processing STS-1 SPEs, or equivalently, VC3s carried within AU3s, each TPP
receives its own J1 byte marker and H4 byte. Coordination is accomplished as
follows: The tributary multiframe alignment that is detected by TPP #1 is
distributed to the two other TPPs as they are not receiving H4 bytes. In addition,
the input demultiplexer will stretch the pulse captured on the IC1J1 input that
marks the VC4 J1 byte so that it marks the next two bytes. During the
demultiplexing process this effectively feeds a "J1" marker to the two "slaved"
TPPs.
The modes of operation of the TUPP are summarized as follows:
STS-1 Mode
This is default. Each STS-1 is assumed to carry seven VT groups, each of which
can be independently configured to carry VT1.5s, VT2s, VT3s, or VT6s. The
IC1J1 input is expected to mark the J1 byte of each STS-1 SPE and each TPP
detects the tributary multiframe encoded in the unique H4 byte that it receives.
AU3 Mode
This is also the default, as is corresponds exactly to STS-1 mode, except for
nomenclature. Each AU3 is assumed to carry seven TUG2s, each of which can
be independently configured to carry TU11s, TU12s, or TU2s. (The equivalent of
a VT3 is allowed but there is no SDH nomenclature to describe this.) The IC1J1
input is expected to mark the J1 byte of each VC3 and each TPP detects the
tributary multiframe encoded in the unique H4 byte that it receives.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
ISSUE 8
TRIBUTARY UNIT PAYLOAD PROCESSOR
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PM5361 TUPP