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DATASHEET
PM5349 S/UNI-QUAD
ISSUE 6 | SATURN USER NETWORK INTERFACE | |
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optionally returned to the source node by signaling the corresponding Transmit Path Overhead Processor in the local SONET/SDH equipment to insert a path RDI indication.
Invalid pointer indications (inv_point), invalid NDF codes, new pointer indications (new_point), discontinuous change of pointer alignment, and illegal pointer changes are also detected and reported by the Pointer Interpreter block via register bits. An invalid NDF code is any NDF code that does not match the NDF enabled or NDF disabled definitions. The third occurrence of equal new_point indications (3 x eq_new_point) is reported as a discontinuous change of pointer alignment event (DISCOPA) instead of a new pointer event and the active offset is updated with the receive pointer value. An illegal pointer change is defined as
ainc_ind or dec_ind indication that occurs within three frames of the previous inc_ind, dec_ind or NDF_enable indications. Illegal pointer changes may be optionally disabled via register bits.
The active offset value is used to extract the path overhead from the incoming stream and can be read from an internal register.
10.5.2SPE Timing
The SPE Timing Block provides SPE timing information to the Error Monitor and the Extract blocks. The block contains a free running timeslot counter that is initialized by a J1 byte identifier (which identifies the first byte of the SPE). Control signals are provided to the Error Monitor and the Extract blocks to identify the Path Overhead bytes and to downstream circuitry to extract the ATM cell payload.
10.5.3Error Monitor
The Error Monitor Block contains two
Path
FEBEs are detected by extracting the
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