S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
Released
Figure 3 Typical STS-3c/STM-1 S/UNI-8x155 Jitter Tolerance
Framed Jitter Tolerance (Synchronous, With OA) Under Nominal Condition
100
OC-3 Mask
Channel 0
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
10
A
m
pli
tu
de
(UI
pp
1
0.1
10
100
1000
10000
100000
1000000
10000000
Frequency (Hz)
10.1.2 Serial to Parallel Converter
The Serial to Parallel Converters (SIPO) convert each received bit serial stream to a byte serial
stream. The SIPO searches for the initial SONET/SDH framing pattern in the receive stream,
and performs serial to parallel conversion on octet boundaries.
While out of frame, the CRSI block monitors the bit-serial STS-3c/STM-1 data stream for an
occurrence of a A1 byte. The CRSI adjusts its byte alignment of the serial-to-parallel converter
when three consecutive A1 bytes followed by three consecutive A2 bytes occur in the data
stream. The CRSI informs the RSOP Framer block when this framing pattern has been detected
to reinitializes the RSOP to the new frame alignment.
While in frame, the CRSI maintains the byte alignment of the serial-to-parallel converter until
RSOP declares out of frame.
10.2 Receive Section Overhead Processor (RSOP)
The Receive Section Overhead Processor (RSOP) provides frame synchronization,
descrambling, section level alarm and performance monitoring. In addition, it may extract the
section data communication channel from the section overhead and provide it serially on the
receive DCC outputs.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
67
PMC [ PMC-SIERRA, INC ]
