PMC-Sierra PM5349 Line Febe Insert, Transmit Path Overhead Processor Tpop, Pointer Generator

PMC-Sierra, Inc.

S/UNI-QUAD

DATASHEET

PM5349 S/UNI-QUAD

PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)

10.9.4 Line FEBE Insert

The Line FEBE Insert Block accumulates line BIP-24 errors (B2) detected by the Receive Line Overhead Processor and encodes far end block error indications in the transmit M1 byte.

10.10Transmit Path Overhead Processor (TPOP)

The Transmit Path Overhead Processor (TPOP) provides transport frame alignment generation, pointer generation (H1, H2), path overhead insertion and the insertion of path level alarm signals.

10.10.1Pointer Generator

The Pointer Generator Block generates the outgoing payload pointer (H1, H2) as specified in the references. The concatenation indication (the NDF field set to 1001, I-bits and D-bits set to all ones, and unused bits set to all zeros) is inserted in the second and third pointer byte locations in the transmit stream.

∙(1) A "normal pointer value" locates the start of the SPE. Note: 0 ≤ "normal pointer value" ≤ 782, and the new data flag (NDF) field is set to 0110. Note that values greater than 782 may be inserted, using internal registers, to generate a loss of pointer alarm in downstream circuitry.

∙(2) Arbitrary "pointer values" may be generated using internal registers. These new values may optionally be accompanied by a programmable new data flag. New data flags may also be generated independently using internal registers.

∙(3) Positive pointer movements may be generated using a bit in an internal register. A positive pointer movement is generated by inverting the five I-bits of the pointer word. The SPE is not inserted during the positive stuff opportunity byte position, and the pointer value is incremented by one. Positive pointer movements may be inserted once per frame for diagnostic purposes.

∙(4) Negative pointer movements may be generated using a bit in an internal register. A negative pointer movement is generated by inverting the five D-bits of the pointer word. The SPE is inserted during the negative stuff opportunity byte position, the H3 byte, and the pointer value is decremented by one. Negative pointer movements may be inserted once per frame for diagnostic purposes.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use 49