PM4341AT1XC Datasheet, PDF (226/288 Pages) PMC-Sierra, Inc – SINGLE DSX-1 TRANSCEIVER DEVICE

DATA SHEET
PMC-900602
ISSUE 7
PM4341A T1XC
T1 FRAMER/TRANSCEIVER
Figure 33 - 1.544MHz Transmit Backplane Interface - with ALTFDL
Sampling of framing bit position is determined by
internal superframe alignment, or by superframe
alignment indication applied on BTFP
BTPCM
OFP
OPCM
(output
from
XBAS)
Ch24
Ch1 ^… Ch24
Ch1 ^… Ch24
Ch1 ^… Ch24
Ch1 ^… Ch24
Ch1
M1
M1
M2
M2
M3
Every second framing bit position is
sampled and re-inserted into outgoing
ESF stream
…
…
…
…
Ch24
Ch1 ^… Ch24
Ch1 ^… Ch24
Ch1 ^… Ch24
Ch1 ^… Ch24
C3
M1
F3
M2
C4
The XBAS is configured to transmit ESF formatted data and the Transmit
Backplane is configured to accept 1.544MHz, single-rail formatted data. The
Transmit Backplane Options register is programmed to BTX2M=0, BTX2RAIL=0,
BTXSFP=0; the T1XC Receive Options register is programmed to SIGAEN=0
and TXSIGA=X. The data link, with each bit duplicated, is carried in the framing
bit position on the BTPCM stream. To transmit this data link in the correct position
in the ESF-formatted stream, the FDL bypass function must be used by
programming the FDLBYP=1 in the Transmit Framing and Bypass Options
register.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 208