cx29610 Mindspeed Technologies, cx29610 Datasheet - Page 73

• Manufacturer Part Number: cx29610
• Description: Optiphytm - M622 Sts-12/4x Sts-3 Sonet/sdh Multiplexer
• Manufacturer: Mindspeed Technologies

CX29610
CX29610 Data Sheet
29610-DSH-001-C
2.4.3.3 Loss of Pointer
2.4.3.4 B2
The H1and H2 pointer processor reports Loss of Pointer (LOP) in RXPTH bit 7 if
a valid pointer is not found for 10 consecutive frames. LOP-P is cleared when a
valid pointer with NDF or a valid concatenation indicator has been received for
three consecutive frames. LOP-P is terminated upon detection of AIS-P or when
relaying an all-ones pointer.
pattern for 3 consecutive frames. Path AIS is terminated when a valid H1/H2
pointer is found or when LOP-P (not AIS) is detected.
first valid pointer value after deassertion of either AIS-L or AIS-P.
DOWNALM is high. In TU-3 mode, AIS-P detection in the AU-4 (path 1) forces
downstream AIS-P in all paths.
SPE contents to be all ones.
incoming signal, AIS-P is automatically generated in the downstream data path
by placing all-ones content in the H1/H2/H3 bytes and in the entire STS SPE.
Write bits 6, 5, or 4 (for the respective STS-1) of DOWNALM low to disable
Automatic generation of AIS-P.
Uneq-P in addition to the normal generation on reception of LOP-P.
The Line Parity byte, B2, monitors the line for BIP-24 and BIP-96 errors. Errors
are reported in RXLIN bit 4 and counted in B2CNT. The counter length is 20 bits
so that saturation does not occur during a one-second latching interval.
calculation (for STS-12 signals) as the default. If TXLIN bit 4 is set high, all B2
bytes will contain 00h. If ERRINS bits 5, 4, or 3 are set high, the normal B2 byte
value (by calculation or 00h as determined by TXLIN bit 4) in the appropriate B2
byte will be XORed with the value contained in the ERRPAT register before
transmission.
AIS-P is reported in RXPTH bit 6 when the H1/H2 bytes contain an all-ones
The transmit pointer generator generates a New Data Flag indication on the
Upstream AIS-P detection can force downstream AIS-P generation if
Set TXPTH bit 4 high to generate AIS-P, causing the H1/H2/H3 bytes and the
When an LOP-P, AIS-P, or a tandem connection ISF defect is detected on the
Set DOWNALM bit 1 high to generate AIS-P on reception of PLM-P or
B2 carries the BIP-24 calculation (for STS-3 signals) or the BIP-96
B2 BIP counts are disabled during LOS, LOF, or AIS-L conditions.
Mindspeed Technologies
2.4 SONET/SDH Framer and Overhead Processor
™
2.0 Functional Description
2-29