PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
FO_discont:
frame offset discontinuity
PI in AIS state
PI_AIS:
PI_LOP:
PI_NORM:
Note 1
PI in LOP state
PI in NORM state
A frame offset discontinuity occurs if an incoming NDF enabled is
received, or if an ES overflow/underflow occurred.
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:
Note 1
transmit the pointer with NDF disabled and active offset.
active offset is undefined, transmit an all-1's pointer and payload.
active offset is defined as the phase of the SPE (VC).
the ss bits are undefined in SONET, and has bit pattern 10 in SDH
enabled NDF is defined as the bit pattern 1001.
Note 2
Note 3
Note 4
disabled NDF is defined as the bit pattern 0110.
10.7 Receive Cell and Frame Processor (RCFP)
The Receive Cell and Frame Processor (RCFP) performs both ATM and PPP processing. It has
the capability to process a single STS-48c (STM-16c) channel.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
65
PMC [ PMC-SIERRA, INC ]
