PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 118

• Manufacturer Part Number: PM5366-PI
• Description: HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
• Manufacturer: PMC-Sierra, Inc.

PRELIMINARY
DATASHEET
PMC-2010672
9.28 Transmit Tributary Path Overhead Processor (TTOP)
PROPRIETARY AND CONFIDENTIAL
Table 7
Each one of three Transmit Tributary Path Overhead Processors (TTOP)
generates the path overhead for up to 28 VT1.5/TU-11s or 21 VT2/TU-12s.
When configured for SONET compatible operation, the TTOP inserts the four
tributary path overhead bytes (V5, J2, Z6, and Z7) to each tributary. The TTOP
may also be configured for SDH compatible operation. The incoming STM-1
stream may carry three AU3s or an AU4 with three TUG3s.
The TTOP computes the BIP-2 code in the current tributary SPE and inserts the
result into the BIP-2 bits of the V5 byte in the next tributary SPE. The tributary
path signal label in the V5 byte of each tributary can be sourced from internal
registers. The tributary far end block error bit in the V5 byte of each tributary is
inserted based of the BIP error count detected at a companion RTOP block. The
tributary remote failure indication and remote defect indication bits in the V5 or
the Z7 byte of each tributary is inserted based on the tributary alarm status of the
companion RTOP TSB.
The TTOP inserts the tributary trail trace identifier (TTI) into the J2 byte. Each
tributary is provided with a 64-byte buffer to store the identifier. To transmit a 16-
byte message, one must write four identical copies to the buffer. One shadow
buffer is available for temporary replacement of a selected transmitted TTI while
the 64-byte identifier buffer is being updated. Data is retrieved sequentially from
the active buffer at each J2 byte position. No CRC insertion is performed; any
CRC must be written into the trail trace buffer. The shadow buffer can be
programmed with new messages without timing constraints when inactive. An
Row Number
1
2
3
4
5
6
7
8
9
- DS3 desynchronizer clock gapping algorithm.
Normal or DS3 AIS
ISSUE 1
621
621
622
621
621
622
621
621
622
106
Run Faster
621
621
622
621
622
622
621
622
622
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
Run Slower
AND M13 MULTIPLEXER
PM5366 TEMAP-84
621
621
622
621
621
621
621
621
621