PMC-Sierra, Inc.
PM5356
S/UNI-622-MAX
DATASHEET
S/UNI-622-MAX
PMC-1980589
ISSUE 5
SATURN USER NETWORK INTERFACE (622-MAX)
Note that for frequencies below 300Hz, the jitter tolerance is greater than 22 UIpp; 22UIpp is the
maximum jitter tolerance of the test equipment. The dip in the jitter tolerance curve between 10
kHz and 30 kHz is due to the clock difference detector.
Figure 3: Typical STS-12c/STM-4-4c S/UNI-622-MAX Jitter Tolerance
100
10
1
0.1
10
100
1000
10000
100000
1000000
10000000
Jitter Frequency [Hz]
Serial to Parallel Converter
The Serial to Parallel Converter (SIPO) converts the 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-622 block monitors the bit-serial STS-12c/STM-4-4c data stream for
an occurrence of a A1 byte. The CRSI-622 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-622 maintains the byte alignment of the serial-to-parallel converter until
RSOP declares out of frame.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
41
PMC [ PMC-SIERRA, INC ]
