PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
In the transmit direction, the S/UNI-2488 provides register control for the
synchronization status byte.
In the receive direction, the S/UNI-2488 provides register access to the
synchronization status byte.
Z1:
M1:
Z2:
The Z1 bytes are located in the second and third STS-1’s locations of an STS-
48c (STM-16c) and are allocated for future growth.
The M1 byte is located in the third STS-1 location of a STS-48c (STM-16c) and
provides a line far end block error function for remote performance monitoring.
The Z2 bytes are located in the first and second STS-1’s locations of a STS-
12c (STM-4c) and are allocated for future growth.
In the transmit direction, Z2 byte is internally generated. The number of B2
errors detected in the previous interval is inserted.
In the receive direction, a legal Z2 byte value is added to the line FEBE event
counter.
Path Overhead Bytes
J1:
The Path Trace byte is used to repetitively transmit a 64-byte CLLI message
(for SONET networks), or a 16-byte E.164 address (for SDH networks). When
not used, this byte should be set to transmit continuous null characters. Null is
defined as the ASCII code, 0x00.
In the transmit direction, characters can be inserted using the TTTP Path Trace
register. The register is the default selection and resets to 0x00 to enable the
transmission of NULL characters from a reset state.
In the receive direction, the path trace message is optionally extracted into the
16 or 64 byte path trace message buffer.
B3:
The path bit interleaved parity byte provides a path error monitoring function.
In the transmit direction, the S/UNI-2488 calculates the B3 bytes. The
calculated code is then placed in the next frame.
In the receive direction, the S/UNI-2488 calculates the B3 code and compares
this calculation with the B3 byte received in the next frame. B3 errors are
accumulated in an error event counter.
C2:
The path signal label indicator identifies the equipped payload type. For ATM
payloads, the identification code is 0x13. For Packet over SONET (including
X43+1 payload scrambling), the identification code is 0x16.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
436
PMC [ PMC-SIERRA, INC ]
