PM5342 SPECTRA-155
DATA SHEET
PMC-970133
ISSUE 4
SONET/SDH PAYLOAD EXTRACTOR/ALIGNER
Register E4H: SPECTRA-155 Transmit Path AIS Control #2
Bit
Type
R
R
Function
SDBERV
SFBERV
Unused
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
X
X
X
X
0
0
0
0
Unused
R/W
R/W
R/W
R/W
LOPPAIS
LOMTUAIS
TPAIS_EN
PAISPAIS
This register controls the auto assertion of path/TU AIS. When the
SPECTRA-155 is configured for STS-1 (STM-0/AU3) or STS-3c (STM-1/AU4)
mode, this register is not used for PAIS assertion. When configured for STS-3
(STM-1/AU3) mode, this register controls path/TU AIS assertion on the STS-1
(STM-0/AU3) #2 stream only.
PAISPAIS:
When set high, the PAISPAIS bit enables path AIS insertion on the transmit
stream when path AIS is detected on the ADD bus. When PAISPAIS is set
low, path AIS events have no effect on the transmit stream.
TPAIS_EN:
When set high, the TPAIS_EN bit enables path AIS insertion into the transmit
stream via the DTPAIS[2] input signal. When TPAIS_EN is set low, it enables
path AIS insertion into the STS-1 (STM-0/AU3) stream on the DROP bus via
the DTPAIS[2] input signal.
LOMTUAIS:
When set high, the LOMTUAIS bit enables tributary path AIS insertion on the
transmit stream when loss of multiframe (LOM) events are detected on the
ADD bus. The path overhead (POH), the fixed stuff, and the pointer bytes
(H1, H2) are unaffected. When LOMTUAIS is set low, loss of multiframe
events have no effect on the transmit stream. LOMTUAIS must be set low
when transmitting VT3 (TU3) payloads because the loss of multiframe
condition does not exist.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
276
PMC [ PMC-SIERRA, INC ]
