STANDARD PRODUCT
PM4351 COMET
DATA SHEET
PMC-1970624
ISSUE 10
COMBINED E1/T1 TRANSCEIVER
Figure 7
- Compliance with ITU-T Specification G.823 for E1 Input Jitter
DPLL TOLERANCE
WITH AMI ENCODED
215 -1 PRBS
10
SINEWAVE
JITTER
AMPLITUDE
P. TO P. (UI)
LOG SCALE
DPLL TOLERANCE
WITH HDB3 ENCODED
IN SPEC
REGION
215-1 PRBS
1.5
1
REC. G823
JITTER
TOLERANCE
SPECIFICATION
0.2
0.1
1.8
2.4
5
3
4
10
10
10
SINEWAVE JITTER FREQUENCY, Hz - LOG SCALE
9.3
T1 Framer
The T1 framing function is provided by the T1-FRMR block. This block searches
for the framing bit position of SF, ESF, J1, T1DM or SLC®96 framing formats in
the incoming recovered PCM stream. When searching for frame, the T1-FRMR
examines each of the 193 (SF, T1DM or SLC®96) or each of 4*193 (ESF or J1)
framing bit candidates concurrently.
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
standard superframe format (SF, also known as D4 format), the T1-FRMR block
PROPRIETARY AND CONFIDENTIAL
38
PMC [ PMC-SIERRA, INC ]
