PM5362TUPP-PLUS
DATA SHEET
PMC-951010
ISSUE 6
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR / PERFORMANCE MONITOR
8
FUNCTIONAL DESCRIPTION
Input Bus Demultiplexer
8.1
The input bus demultiplexer captures data sampled on the ID[7:0] bus and
distributes this data to the three tributary payload processors within the
TUPP-PLUS.
The input bus demultiplexer also provides timing signals for the other blocks
within the TUPP-PLUS. Frame alignment signals for the incoming data stream,
IC1J1, ITMF, and IPL, are sampled, buffered and distributed to the tributary
payload processors (VTPPs). In order to have synchronous operation of the
VTPPs with a single clock, the incoming data and control signals may be delayed
by up to two system clock cycles before distribution to the VTPPs. The delay is
used to align the incoming data with the outgoing data at each VTPP. The
amount of delay is adjusted such that the separation of the incoming STS/AU
frame and the outgoing frame at each VTPP appears to be in multiples of three
SCLK or six NSCLK periods.
When configured for AU4 mode, the input bus demultiplexer provides the
necessary timing coordination between the three tributary payload processors.
The single J1 byte marker input on IC1J1 is retimed and distributed to each of
the three tributary payload processors. The tributary multiframe detected by
VTPP #1 is distributed to the two other VTPPs, as VTPP #1 is the only one
receiving a valid H4 byte.
8.2
Output Bus Multiplexer
The output bus multiplexer gathers payload data from the three tributary payload
processors within the TUPP-PLUS and multiplexes this data onto the OD[7:0]
bus. It also multiplexes signals from each tributary payload processor that mark
tributary SPEs and tributary V5 bytes onto the shared OTPL and OTV5 signals.
The extracted tributary path overhead serial signals (POH[3:1], POHFP[3:1],
POHEN[3:1], POHCK[3:1] and RAD) are buffered by the output bus multiplexer
block.
The output bus multiplexer also provides timing signals for other blocks within the
TUPP-PLUS. Frame alignment signals for the outgoing data stream, OC1J1,
OPL and OTMF, are sampled, buffered and distributed to the tributary payload
processors (VTPPs), the tributary path overhead processors (RTOPs) and the
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
41
PMC [ PMC-SIERRA, INC ]
