PM5364 pmc-sierra, PM5364 Datasheet - Page 109

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

10.6.2
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
The Tributary path interprets VT/TU pointers. It processes the tributary trace message within
the path trace byte of the virtual tributaries, processes the tributary path overhead bytes of the
tributaries and extracts the tributary path overhead bytes into a serial stream. It generates the
tributary payload pointers for the outgoing STM-4/STS-12 data stream, and aligns the outgoing
tributary multiframe to an equipment reference.
The Tributary path translates incoming pointer justifications in high order payloads (STS-1,
AU4, AU3) to pointer justifications in low order payloads (VT6, VT3, VT2, VT1.5, TU3, TU2,
TU12, or TU11), resulting in all VT/TUs being located in fixed columns of the transport frame.
It provides software configurable offset between the payload frame boundaries (J1) and the H3
byte of the transport overhead (High Order H1, H2 pointer value = 0 or 522). It aligns the
synchronous payloads of a SONET/SDH STS-48/STM-16 or four STS-12/STM-4 byte serial
streams to a new transport frame reference (J0). It inserts valid high order pointer bytes (H1,
H2), framing bytes (A1, A2).
The VTPI, RTTB336, RTOP336, and VTPA interrupts can be disabled on an STM-0/STS-1
basis for bypass traffic to suppress extraneous interrupts.
The Tributary path can optionally perform the AU3 to AU4 and AU4 to AU3 conversions
shown in Table 9.
Table 9 Tributary Path AU3/AU4 Conversions
(*) Except H4, which will always be generated.
Notes
•
The outgoing tributary multiframe alignment (H4) from the VTPA is controlled by the OTMF
input to the Payload Processor block. OTMF is generated from the EJ0 input to the TUPP 2488.
Bypass Path
The Bypass path runs through the VTPI, RTOP336, RTTB336, and SVCA_R and terminates at
the input to the Tributary-Bypass Mux. The Bypass path processes any mix of non-VT/TU
mapped payloads, including contiguous concatenation frame structures. The full range of frame
structures supported by the Bypass Path is shown in Figure 23 and Figure 24.
Incoming Payload
AU4/VC4/TUG3/TUG2
AU3/VC3/TUG2
AU3/VC3/C3
The TUG2s each contain TU2, TU11 or TU12 tributaries units.
Outgoing Payload
AU3/VC3/TUG2
AU4/VC4/TUG3/TUG2
AU4/VC4/TUG3/TU3/VC3/C3
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Outgoing VC4
Path Overhead
N/A
All zeros(*)
All zeros(*)
Outgoing VC3
Path Overhead
All zero(*)
N/A
Same as Incoming
VC3 Path Overhead
Released
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