PM5364 pmc-sierra, PM5364 Datasheet - Page 111

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

10.6.3
10.6.4
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2011334, Issue 7
The Bypass path performs the AU4 to AU3 conversion shown in Table 10.
Table 10 Bypass Path AU4 to AU3 Conversion
Incoming Payload
AU4/VC4/TUG3/TU3/VC3/C3
Tributary-Bypass Mux
There are four distinct types of operation that the Payload Processor can perform, two for each
of the two paths:
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•
•
•
All four operations occur at STS-1/STM-0, STS-3/STM-1, or STS-12/STM-4 granularities
depending on the operation and payload configuration.
The Tributary-Bypass Mux selects the TelecomBus stream from either the Tributary Path or
Bypass Path on an STM-0/STS-1 timeslot basis. The selection of the valid path (Tributary or
Bypass) for each STM-0/STS-1 timeslot is user programmable.
VT/TU Pointer Interpreter (VTPI)
When used for SONET compatible operation, the VT/TU Pointer Interpreter (VTPI) processes
the tributary payload pointers in the incoming STS-12 data stream. Each of the seven tributary
groups (VT groups) per STS-1 may be independently configured to accept any of the four
tributary types (VT1.5, VT2, VT3, or VT6). Based on the value of the tributary pointer (V1, V2
bytes), a reference signal is generated to mark the beginning of a VT SPE (V5 byte). The VTPI
maintains the relative rates and justification events for further processing by downstream
blocks. To assist downstream blocks in tributary processing, the VTPI provides control signals
for tributary framing.
Similarly, when used for SDH compatible operation, the VTPI processes the tributary payload
pointers in all AU3s or any of the three TUG3s in an AU4 of the incoming STM-4 data stream.
Each of the seven TUG2s per TUG3 or AU3 may be independently configured to accept any of
the three tributary types (TU11, TU12, or TU2). Alternately, the VTPI can process the payload
pointer of a single TU3 mapped into a TUG3. A reference signal is generated to mark the
beginning of a virtual container or VC (V5 byte). The VTPI maintains the relative rates and
justification events for further processing by downstream blocks. To assist downstream blocks
in tributary processing, the VTPI provides control signals for tributary framing.
Tributary Path: VT/TU mapped payload processing.
Tributary Path: AU3/AU4 conversions.
Bypass Path: non-VT/TU mapped payload processing including contiguously concatenated
payloads.
Bypass Path: AU4 to AU3 conversion.
Outgoing Payload
AU3/VC3/C3
TUPP™ 2488 ASSP Telecom Standard Product Data Sheet
Outgoing VC4 Path
Overhead
N/A
Outgoing VC3 Path
Overhead
Same as Incoming
VC3 Path Overhead
Released
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