PM5344SPTX Datasheet, PDF (50/212 Pages) PMC-Sierra, Inc – SONET/SDH PATH TERMINATING TRANSCEIVER TELECOM

DATA SHEET
PMC-930531
ISSUE 6
PM5344 SPTX
SONET/SDH PATH TERMINATING TRANSCEIVER
FO_discont:
frame offset discontinuity
PI_AIS:
PI in AIS state
PI_LOP:
PI in LOP state
PI_NORM:
PI in NORM state
Note 1 -
A frame offset discontinuity occurs if an incoming NDF
enabled isreceived, 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
withNDF enabled and new offset.
norm_point:
transmit the pointer with NDF disabled and active offset.
AIS_ind:
active offset is undefined, transmit an all-1's pointer and
payload.
Note 1 -
active offset is defined as the phase of the SPE (VC).
Note 2 -
the ss bits are undefined in SONET, and has bit pattern 10 in
SDH
Note 3 -
enabled NDF is defined as the bit pattern 1001.
Note 4 -
disabled NDF is defined as the bit pattern 0110.
9.3.3 Tandem Connection Alarm
When terminating a tandem connection, the Tandem Connection Alarm block
converts Incoming Signal Failure code (ISF) in the tandem connection
maintenance byte (Z5) to path AIS in the DROP bus. The ISF code can be
optionally filtered so that path AIS is only inserted after detecting ISF in three
consecutive frames. Similarly, path AIS is removed after three consecutive
frames where ISF is not present. When filtering is disabled, path AIS is
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 36