PM5364 pmc-sierra, PM5364 Datasheet - Page 175

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

13.6.2
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
The Tributary path can perform any legal AU3 to AU4 conversion, and AU4 to AU3 conversion
with tributary traffic. This means that the incoming and outgoing frame configurations are
different. The legal conversions for the Tributary path are:
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In both normal and conversion cases a TUG2 can contain a TU11, TU12, or TU2. Further
details on SONET and SDH data types are given in the next section.
Tributary Path Functional Block Operation
The VTPI, RTTB336, RTOP336, and VTPA share a common internal architecture in the way
they are configured, what payloads they support and how they process the incoming
STM-4/STS-12 frames.
They process the portion of a SONET frame that corresponds to an STS-1 SPE. Equivalently,
they process the portion of an SDH frame that corresponds to a VC3 with the 2 columns of
fixed stuff that are added when mapping a VC3 into an AU3. By time-slicing the operation, they
can process a SONET STS-12 or SDH STM-4 frame (the associated data bytes for four STM-1
frames whose bytes are labeled A, B, C, and D are interleaved in an STM-4 frame in the order
A, B, C, D, A, B, C, D…) by independently processing 12 STS-1 SPEs or 12 VC3s carried
within AU3s.
The payloads supported are summarized as follows:
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3x AU3/VC3/TUG2 to AU4/VC4/TUG3/TUG2
3x AU3/VC3/C3 to AU4/VC4/TUG3/TU3/VC3/C3
AU4/VC4/TUG3/TUG2 to 3x AU3/VC3/TUG2
Note: Mixing AU3/VC3/C3 and AU3/VC3/TUG2 payloads in an AU4 during AU3 to AU4 or AU4
to AU3 conversion is not supported.
STS-1: 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. There are up to 12
interleaved STS-1s, each processed independently, in the received STS-12 frame.
AU3: This is also the default, as it corresponds exactly to STS-1, 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 an AU3 is allowed but there
is no SDH nomenclature to describe this). There are up to 12 interleaved AU3s, each
processed independently, in the received STM-4 frame.
TUG3: This is enabled for a particular STS-1 when the associated TU3 bit in the Frame
Configuration Register is set low and ITUG3 bit of the same register is set high for the
corresponding STS-1 (AU3) time slots. Four frame configuration registers are provided for
each payload processing slice, one register for the VTPI, one for the RTOP336 and RTTB
blocks, one for the VTPA ingress frames, and one for the VTPA egress frames. The TUG3 is
multiplexed with two others into an AU4. Each TUG3 in the AU4 may be independently
configured for TU3 or TUG2. The TUG3 processed carries seven TUG2s, each of which
can be independently configured to carry TU11s, TU12s, or TU2s. There are up to four
interleaved AU4s, each processed independently, in the received STM-4 frame.
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Released
175