PM5344SPTX Datasheet, PDF (42/212 Pages) PMC-Sierra, Inc – SONET/SDH PATH TERMINATING TRANSCEIVER TELECOM

DATA SHEET
PMC-930531
ISSUE 6
PM5344 SPTX
SONET/SDH PATH TERMINATING TRANSCEIVER
the received pointer can be interpreted, according to voting
on the I and D bits, as a positive or negative justification
indication,
after making the requested justification, the received pointer
continues to be interpretable as a pointer justification.
When the received pointer returns to an in-range value, the
SPTX will interpret it correctly.
Note 10 -
LOP will exit at the third frame of a three frame sequence
consisting of one frame with NDF enabled followed by two
frames with NDF disabled, if all three pointers have the
same legal value.
The transitions indicated in the state diagram are defined as follows:
inc_ind/dec_ind: offset adjustment (increment or decrement indication)
3 x eq_new_point: three consecutive equal new_point indications
NDF_enable:
single NDF_enable indication
3 x AIS_ind:
three consecutive AIS indications
8 x inv_point:
eight consecutive inv_point indications
8 x NDF_enable eight consecutive NDF_enable indications
Note 1 -
the transitions from NORM_state to NORM_state do not
represent state changes but imply offset changes.
Note 2 -
3 x new_point takes precedence over 8 x inv_point.
Note 3 -
all three offset values received in 3 x eq_new_point must be
identical.
Note 4 -
"consecutive event counters" are reset to zero on a change
of state except for consecutive NDF count.
The Pointer Interpreter Block detects loss of pointer (LOP) in the incoming STS-1
or STS3c stream. LOP is declared on entry to the LOP_state as a result of eight
consecutive invalid pointers or eight consecutive NDF enabled indications. Path
AIS is inserted in the DROP bus when LOP is declared. The alarm condition is
reported in the receive alarm port and is optionally returned to the source node
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