PM6341 E1XC
DATA SHEET
PMC-910419
ISSUE 8
E1 FRAMER/TRANSCEIVER
Figure 6
- CDRC JitterTolerance
Max t olerance ceiling of 2 5 6 UI at 2 .0 4 8 MHz
BRCLK - lim it ed by 2 5 6 bit fram e slip buff er.
10
SINEWAVE
DPLL TOLERANCE WITH
14 ZEROS RESTRICTION
(ALGSEL=0)
JITTER
IN SPEC
AMPLITUDE
P. TO P. (UI)
LOG SCALE
DPLL TOLERANCE
REGION
WITH 25% ONES
DENSITY
(ALGSEL=0)
1.5
25% ONES
DENSITY
(ALGSEL=1)
1
REC. G823 JITTER
TOLERANCE
SPECIFICATION
0.2
0.1
1.8
2.0
2.4
1
2
3
4
5
10
10
10
10
10
SINEWAVE JITTER FREQUENCY, Hz - LOG SCALE
9.4
Framer (FRMR)
The Framer (FRMR) block searches for frame alignment, CRC multiframe
alignment, and channel associated signalling (CAS) multiframe alignment in the
incoming recovered PCM stream.
Once the FRMR has found basic (or FAS) frame alignment, the incoming PCM
data is continuously monitored for FAS/NFAS framing bit errors. Framing bit
errors are accumulated in the framing bit error counter contained in the PMON
block. Once the FRMR has found CAS multiframe alignment, the PCM data is
continuously monitored for CAS multiframe alignment pattern errors. Once the
FRMR has found CRC multiframe alignment, the PCM data is continuously
monitored for CRC multiframe alignment pattern errors, and CRC-4 errors. The
FRMR also detects and indicates loss of frame, loss of CAS multiframe, and loss
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
43
PMC [ PMC-SIERRA, INC ]
