PM5363 TUPP+622
TUPP+622
DATASHEET
PMC-1981421
ISSUE 4
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR FOR 622 MBIT/S
INTERFACES
Register 428H, 468H, 4A8H: RTTB, TIU Threshold
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TIU64[3]
TIU64[2]
TIU64[1]
TIU64[0]
TIU16[3]
TIU16[2]
TIU16[1]
TIU16[0]
0
1
1
1
0
1
1
1
This register contains threshold for declaration of the trail trace identifier unstable
alarm (TIU) for 16-byte and 64-byte tributary path trace messages.
TIU16[3:0]:
The 16-byte message trail trace identifier unstable threshold bits (TIU16[3:0])
controls level in the unstable counter at which to declare TIU. When ALGO2 is
set low, each time a received message differs from the previous message, the
unstable counter is incremented. When the count exceeds TIU16, the TIU
alarm is declared. When ALGO2 is set high, a message that differs from the
previous initiates the unstable counter to count once per message. When the
count exceeds TIU16, the TIU alarm is declared. TIU is negated and the
unstable counter cleared when a consistent message is repeated three or five
times, as controlled by the PER5 bit, to become the accepted message.
TIU64[3:0]:
The 64-byte message trail trace identifier unstable threshold bits (TIU64[3:0])
controls level in the unstable counter at which to declare TIU. When ALGO2 is
set low, each time a received message differs from the previous message, the
unstable counter is incremented. When the count exceeds TIU64, the TIU
alarm is declared. When ALGO2 is set high, a message that differs from the
previous initiates the unstable counter to count once per message. When the
count exceeds TIU64, the TIU alarm is declared. TIU is negated and the
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
318
PMC [ PMC-SIERRA, INC ]
