PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
The RTOP provides tributary performance monitoring of incoming tributaries. Bit
interleaved parity of the incoming tributaries is computed and compared with the
BIP-2 code encoded in the V5 byte of the tributary. Errors between the computed
and received values are accumulated. RTOP also accumulates remote error
indication codes. Incoming path signal label is debounced and compared with the
provisioned value. Path signal label unstable, path signal label mismatch and
change of path signal label event are identified.
10.4.1 Clock Generator
The clock generator derives various clocks from the 19.44 MHz system clock and
distributes them to other blocks within the tributary path overhead processor. The
overall design is totally synchronous, with processing occurring at a 6.48 MHz
rate in each tributary path overhead processor.
10.4.2 Timing Generator
The timing generator identifies the incoming tributary being processed at any
given point in time. Based on the configuration of the RTOP (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 identification of specific tributaries allows
the error monitor and extract blocks to be time-sliced across the mix of tributaries
present in the incoming data stream.
10.4.3 Error Monitor
The error monitor block is a time-sliced state machine. It relies on the timing
generator block to identify the tributary being processed. The error monitor block
contains a set of 12-bit counters that are used to accumulate tributary path BIP-2
errors, and a set of 11-bit counters to accumulate remote error indications (REI).
The contents of the counters may be transferred to a holding RAM, and the
counters reset under microprocessor control.
Tributary path BIP-2 errors are detected by comparing the tributary path BIP-2
bits in the V5 byte extracted from the current multiframe, to the BIP-2 value
computed for the previous multiframe. BIP-2 errors may be accumulated on a
block or nibble basis as controlled by software configurable registers. Remote
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
101
PMC [ PMC-SIERRA, INC ]
