PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
corresponding enable register bits is also set high. Bits 1, 2, 5, 6 and 7 are
unmodified.
10.4.5 Extract
The extract block uses timing information from the timing generator block to
extract, serialize and output the tributary path overhead bytes (V5, J2, Z6, Z7) of
all the processed tributaries on the corresponding POH output. The
corresponding POHFP output is provided to identify the most significant bit of the
V5 byte of the first tributary on the POH output. All four tributary path overhead
bytes are shifted out within each payload frame period. Therefore, each byte is
shifted out more than once. The corresponding POHEN output is used to identify
fresh overhead bytes. POHEN is set high when the tributary path overhead byte
is shifted out for the first time. POHEN is set low when the overhead byte is
merely repeated. The corresponding tributary path overhead clock, POHCK, is
nominally a 9.72 MHz clock.
10.5 Tributary Trace Buffer (RTTB)
Each tributary trace buffer (RTTB) monitors the outgoing stream of an associated
tributary payload processor (VTPP) and processes the tributaries within an STS-
1, AU3, or TUG3. Each RTTB 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 RTTB ranges from 1 (when configured to
process a single TU3) to 28 (when configured to process all VT1.5s or all TU11s).
The RTTB extracts the tributary path trace message contained in the J2 byte (J1
byte in TU3) to a set of internal buffers. The buffers are microprocessor
accessible to allow system software to examine the messages. Another set of
buffers is provided for system software to download the expected message. The
RTTB compares the received message with the provisioned message and
reports on the state of match. The RTTB also monitors for unstable incoming
tributary path trace messages.
10.5.1 Clock Generator
The clock generator derives various clocks from the 19.44 MHz system clock and
distributes them to other blocks within the tributary trace buffer. The overall
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
104
PMC [ PMC-SIERRA, INC ]
