PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
2.
3.
Enabled NDF is defined as the bit pattern 1001.
Disabled NDF is defined as the bit pattern 0110.
The pointer generator is a time-sliced state machine that can process up to 28
independent tributaries. The state vector is saved in RAM at the address
associated with the current tributary. The pointer generator fills the outgoing
tributary synchronous payload envelopes with bytes read from the associated
FIFO in the payload buffer for the current tributary. The pointer generator creates
pointers in the V1-V3 bytes (or H1-H3 bytes in the case of TU3s) of the outgoing
data stream. The marker that tags the V5 byte (or J1 byte in the case of a TU3)
that is passed through the payload buffer is used to align the pointer. The
outgoing timing generator directs the pointer generator to the FIFO in the payload
buffer that is associated with the tributary being processed. The pointer generator
monitors the fill levels of the payload buffers and inserts outgoing pointer
justifications as necessary to avoid FIFO spillage. Normally, the pointer generator
has a FIFO dead band of two bytes. The dead band can be collapse to one so
that any incoming pointer justifications will be reflected by a corresponding
outgoing justification with no attenuation. Signals are output by the pointer
generator that identify outgoing V5 bytes (or J1 bytes in the case of a TU3) and
the tributary synchronous payload envelopes. These simplify the design of
mappers downstream of the TUPP+622. On a per tributary basis, tributary path
AIS and tributary idle (unequipped) can be inserted as controlled by
microprocessor accessible registers. The idle code is selectable globally for the
entire VC3 or TUG3 to be all-zeros or all-ones. It is also possible to force an
inverted new data flag on individual tributaries for the purpose of diagnosing
downstream pointer processors. Tributary path AIS is automatically inserted into
outgoing tributaries if the pointer interpreter detects tributary path AIS on the
corresponding incoming tributary.
10.4 Tributary Path Overhead Processor (RTOP)
Each tributary path overhead processor (RTOP) monitors the outgoing stream of
an associated tributary payload processor (VTPP) and processes the tributaries
within an STS-1, AU3, or TUG3. Each RTOP 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 RTOP ranges from 1 (when
configured to process a single TU3) to 28 (when configured to process all VT1.5s
or all TU11s).
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
100
PMC [ PMC-SIERRA, INC ]
