PM4341AT1XC
DATA SHEET
PMC-900602
ISSUE 7
T1 FRAMER/TRANSCEIVER
Figure 7
- CDRC JitterTolerance
10
IN SPEC. REGION
CDRC MAX. TOLERANCE
(ALGSEL=0)
SINEWAVE
JITTER
AMPLITUDE
P. TO P. (UI)
LOG SCALE
CDRC MAX. TOLERANCE
(ALGSEL=1)
0.4
0.3
AT&T SPEC.
BELLCORE SPEC.
0.31
0.70
100
10
SINEWAVE JITTER FREQUENCY, kHz - LOG SCALE
8.4 Framer (FRMR)
The framing function is provided by the FRMR block.This block searches for the
framing bit position in the incoming recovered PCM stream. It works in
conjunction with the FRAM block and the DATA RECOVERY (DREC) block to
search for the framing bit pattern in SF, ESF, T1DM, or SLC®96 framing formats.
When searching for frame, the FRMR examines each of the 193 (SF, T1DM,
SLC®96), or each of 4*193 (ESF) framing bit candidates.The FRAM block is
addressed and controlled by the FRMR while frame synchronization is acquired.
The time required to find frame alignment to an error-free PCM stream
containing randomly distributed channel data (i.e. each bit in the channel data
has a 50% probability of being 1 or 0) is dependent upon the framing format. For
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
40
PMC [ PMC-SIERRA, INC ]
