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S/UNI-QUAD
PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
203
H1, H2: The pointer value bytes locate the path overhead column in the
SONET/SDH frame.
H3: The pointer action bytes contain synchronous payload envelope
data when a negative stuff event occurs. The all zeros pattern is
inserted in the transmit direction. This byte is ignored in the
receive direction unless a negative stuff event is detected.
B2: The line bit interleaved parity bytes provide a line error monitoring
function.
K1, K2: The K1 and K2 bytes provide the automatic protection switching
channel. The K2 byte is also used to identify line layer
maintenance signals. Line RDI is indicated when bits 6, 7, and 8
of the K2 byte are set to the pattern '110'. Line AIS is indicated
when bits 6, 7, and 8 of the K2 byte are set to the pattern '111'.
S1: The S1 byte provides the synchronization status byte. Bits 5
through 8 of the synchronization status byte identifies the
synchronization source of the STS-3c (STM-1) signal. Bits 1
through 4 are currently undefined.
M1: The M1 byte is located in the third STS-1 locations of a STS-3c
(STM-1) and provides a line far end block error function for
remote performance monitoring.
Path Overhead Bytes
J1: This byte is set to transmit continuous null characters. Null is
defined as the ASCII code, 0x00.
B3: The path bit interleaved parity byte provides a path error
monitoring function.
C2: The path signal label indicator identifies the equipped payload
type. For ATM payloads, the identification code is 0x13
G1: The path status byte provides a path FEBE function, and a path
remote defect indication function. Three bits are allocated for
remote defect indications: bit 5 (the path RDI bit), bit 6 (the
auxiliary path RDI bit) and bit 7 (Enhanced RDI bit). Taken
together these bits provide a eight state path RDI code that can
be used to categorize path defect indications.