PM5362TUPP-PLUS
DATA SHEET
PMC-951010
ISSUE 6
SONET/SDH TRIBUTARY UNIT PAYLOAD PROCESSOR / PERFORMANCE MONITOR
ES_upperT:
ES filling is above the upper threshold + previous inc_ind,
dec_ind or NDF_enable more than three frames ago.
FO_discont:
PI_AIS:
frame offset discontinuity
PI in AIS state
PI_LOP:
PI_NORM:
Notes
PI in LOP state
PI in NORM state
1. A frame offset discontinuity occurs if an incoming NDF enabled is received, or
if an elastic store overflow/underflow occurred.
2. Transition to AIS state due to PI_LOP event may be optionally disabled.
The autonomous transitions indicated in the state diagram are defined as follows:
inc_ind:
transmit the pointer with NDF disabled and inverted I bits,
transmit a stuff byte in the byte after H3, increment active
offset.
dec_ind:
transmit the pointer with NDF disabled and inverted D bits,
transmit a data byte in the H3 byte, decrement active offset.
NDF_enable:
accept new offset as active offset, transmit the pointer with
NDF enabled and new offset.
norm_point:
AIS_ind:
transmit the pointer with NDF disabled and active offset.
active offset is undefined, transmit an all-1's pointer and
payload.
Notes:
1. Active offset is defined as the phase of the SPE (VC).
2. Enabled NDF is defined as the bit pattern 1001.
3. Disabled NDF is defined as the bit pattern 0110.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
50
PMC [ PMC-SIERRA, INC ]
