STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
ROHM BRXSMFP BRXCMFP Result
0
1
1
Backplane receive composite multiframe
output:
BRFP goes high on the active BRCLK
edge marking the beginning of bit 1 of
frame 1 of every 16 frame signaling
multiframe, indicating the signaling
multiframe alignment of the BRPCM data
stream, and returns low on the active
BRCLK edge marking the end of bit 1 of
frame 1 of every 16 frame CRC
multiframe, indicating the CRC multiframe
alignment of the BRPCM data stream.
This mode allows both multiframe
alignments to be decoded externally from
the single BRFP signal. Note that if the
signaling and CRC multiframe alignments
are coincident, BRFP will pulse high for 1
BRCLK cycle every 16 frames.
1
X
X
Backplane receive overhead output:
BRFP is high for timeslot 0 and timeslot 16
of each 256-bit frame, indicating the
overhead of the BRPCM data stream.
PROPRIETARY AND CONFIDENTIAL
143
PMC [ PMC-SIERRA, INC ]
