PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
In STM-4 (STS-12) interface mode, the second stage of the output bus
multiplexer gathers the STM-1 (STS-3) payload data from the four STP’s and
multiplexes this data onto the OD[7:0] bus. It also multiplexes the STM-1 tributary
SPE and tributary V5 byte indication signals from the STP’s onto the OTPL[1]
and OTV5[1] signals, respectively. In STM-1 (STS-3) interface mode, the second
stage of the output bus is bypassed and the STM-1 (STS-3) payload data from
the four STP’s are provided directly to the respective OD[7:0], OD[15:8],
OD[23:16] and OD[31:24] buses. Similarly, the STM-1 tributary SPE and tributary
V5 byte indication signals from the STP’s are provided directly to the respective
OTPL[4:1] and OTV5[4:1] signals.
10.3 Tributary Payload Processor (VTPP)
Each tributary payload processor (VTPP) processes the tributaries within an
STS-1, AU3, or TUG3. Each VTPP can be configured to process any legal mix of
VT1.5s, VT2s, VT3s, or VT6s that can be carried in an STS-1 or any legal mix of
TU11s, TU12s, TU2s, or TU3s, that can be carried in an AU3 or TUG3. The
number of tributaries managed by each VTPP ranges from 1 (when configured to
process a single TU3) to 28 (when configured to process all VT1.5s or
equivalently all TU11s).
10.3.1 Clock Generator
The clock generator derives various clocks from the 19.44 MHz system clock and
distributes them to other blocks within the tributary payload processor. The
overall design is totally synchronous, with processing occurring at a 6.48 MHz
rate in each tributary payload processor.
10.3.2 Incoming Timing Generator
The incoming timing generator identifies the incoming tributary being processed
at any given point in time. Based on the configuration of the VTPP (it can process
various mixes of tributary types), the incoming timing generator extracts the STS-
1 SPE, VC3, or a single TUG3 from a VC4, and identifies the bytes within these
envelopes that correspond to various types of overhead and those that carry
specific tributaries to be processed. The H4 byte is identified for the incoming
multiframe detector so that it can determine the incoming tributary multiframe
boundaries. The identification of specific tributaries allows the pointer interpreter
to be time-sliced across the mix of tributaries present in the incoming data
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
91
PMC [ PMC-SIERRA, INC ]
