PM5316 datasheet(79/491 Pages) PMC

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SONET/SDH Payload Extractor/Aligner (SPECTRA-4x155)

Production

Proprietary and Confidential to PMC-Sierra, Inc. and for its customers’ internal use

Document ID: PMC-1990822, Issue 4

inc_req

Majority of I bits inverted + no majority of D bits inverted.

dec_req

Majority of D bits inverted + no majority of I bits inverted.

Notes

Active offset is defined as the accepted current phase of the SPE (VC) in the NORM_state and is

undefined in the other states.

Enabled NDF is defined as the following bit patterns: 1001, 0001, 1101, 1011, 1000.

Disabled NDF is defined as the following bit patterns: 0110, 1110, 0010, 0100, 0111.

The remaining six NDF codes (0000, 0011, 0101, 1010, 1100, 1111) result in an inv_ndf indication.

The ss bits are unspecified in SONET and has bit pattern 10 in SDH.

The use of ss bits in definition of indications may be optionally disabled.

The requirement for previous NDF_enable, inc_ind or dec_ind be more than 3 frames ago may be

optionally disabled.

new_point is also an inv_point.

LOP is not declared if all the following conditions exist:

•

The received pointer is out of range (>782),

•

The received pointer is static,

•

The received pointer can be interpreted, according to majority 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 SPECTRA-4x155 will interpret it correctly.

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.

11. For the purposes of 8xNDF_enable only, the requirement of the pointer to be within the range of 0 to

782 may be optionally disabled.

Table 2 defines the transitions indicated in the state diagram.

Table 2 Pointer Interpreter Transition Description

Transition

Description

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.

Notes

The transitions from NORM_state to NORM_state do not represent state changes but imply offset

changes.

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