PM4341AT1XC
DATA SHEET
PMC-900602
ISSUE 7
T1 FRAMER/TRANSCEIVER
format is identical to T1 (i.e. 1.544MHz rate with 24 contiguous channel bytes
followed by 1 framing bit).
BRX2RAIL:
The BRX2RAIL bit selects whether the backplane receive data signal on the
multifunction outputs BRPCM/BRDP and BRSIG/BRDN are in either dual rail
or single rail format. When BRX2RAIL is set to logic 1, the multifunction pins
become the BRDP and BRDN dual rail outputs, which contain the received
positive and negative line pulses timed to the 1.544MHz receive line rate,
RCLKO. When BRX2RAIL is set to logic 0, the multifunction pins become the
BRPCM and BRSIG digital outputs.
BRXSFP:
The BRXSFP bit selects the output signal seen on the backplane output
BRFPO. When set to logic 1, the BRFPO output pulses high during the first
framing bit of the 12 frame SF or the 24 frame ESF (depending on the
framing format selected in the FRMR ). When BRXSFP is set to logic 0, the
BRFPO output pulses high during each framing bit (i.e. every 193 bits).
ALTBRFP:
The ALTBRFP bit suppresses every second output pulse on the backplane
output BRFPO. When ALTBRFP is set to logic 1, the output signal on BRFPO
pulses every 386 bits, indicating every second framing bit (if the BRXSFP bit
is logic 0); or the output signal on BRFPO pulses every 24 or 48 frames (if the
BRXSFP bit is logic 1). This latter setting (i.e. both ALTBRFP and BRXSFP
set to logic 1) is useful for converting SF formatted data to ESF formatted
data between two T1XC devices. When ALTBRFP is set to logic 0, the output
signal on BRFPO pulses in accordance to the BRXSFP bit setting.
RXMTKC:
The RXMTKC bit allows global trunk conditioning to be applied to the
received data and signalling streams, BRPCM and BRSIG. When RXMKTC
is set to logic 1, the data on BRPCM for each channel is replaced with the
data contained in the data trunk conditioning registers within RPSC; similarly,
the signalling data on BRSIG for each channel is replaced with the data
contained in the signalling trunk conditioning registers. When RXMKTC is set
to logic 0, the data and signalling signals are modified on a per-channel basis
in accordance with the control bits contained in the per-channel control
registers within the RPSC.
Upon reset of the T1XC, these bits are cleared to zero.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
67
PMC [ PMC-SIERRA, INC ]
