PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 110

• 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
9.24 Receive Tributary Trace Buffer (RTTB)
PROPRIETARY AND CONFIDENTIAL
Each time an incoming PSL differs from the one in the previous multiframe, the
PSL unstable counter is incremented. Thus, a single bit error in the PSL in a
sequence of constant PSL values will cause the counter to increment twice, once
on the errored PSL and again on the first error-free PSL. The incoming PSL is
considered unstable when the counter reaches five. The counter is cleared
when the same PSL is received for five consecutive multiframes.
When configured for SONET compatible operation, each one of three receive
tributary trace buffers (RTTB) processes the tributary trace message of all the
tributaries in an STS-1 stream. Each of the seven tributary groups (VT groups)
may be independently configured to accept any of the four tributary types (VT1.5,
VT2, VT3, and VT6). The RTTB extracts tributary trace message from each
tributary and stores it in one of a set of internal buffers. The RTTB may be
configured for SDH compatible operation. The incoming stream may carry an
AU3 of an STM1 stream or a TUG3 in an AU4 of an STM1 stream.
Expected PSL
001
001
001
001
PDI Code
PDI Code
PDI Code
PDI Code
XXX ≠ 000, 001,
PDI Code
XXX ≠ 000, 001,
PDI Code
XXX ≠ 000, 001,
PDI Code
XXX ≠ 000, 001,
PDI Code
Accepted PSL
000
001
PDI Code
XXX ≠ 000, 001, PDI Code
000
001
PDI Code
XXX ≠ 000, 001, PDI Code
000
001
XXX
YYY
ISSUE 1
98
PSLM State
Mismatch
Match
Match
Match
Mismatch
Match
Match
Mismatch
Mismatch
Match
Match
Mismatch
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PM5366 TEMAP-84