XRT79L71_1 Datasheet, PDF (134/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
TRANSMIT DS3 RELATED REGISTERS
REV. 1.0.0
Transmit DS3 Configuration Register (Address = 0x1130)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
Force
Tx X-Bits
TxFERF/RDI
TxIdle
TxAIS
TxLOS
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
BIT 2
BIT 1
BIT 0
TxFERF/RDI TxFERF/RDI TxFERF/RDI
upon LOS upon OOF upon AIS
R/W
R/W
R/W
1
1
1
BIT NUMBER
NAME
7
Force TxFERF/RDI
6
Tx X-Bits
TYPE
R/W
R/W
DESCRIPTION
Force Transmit Yellow Alarm (FERF/RDI) indicator:
This READ/WRITE bit-field permits the user to force the Trans-
mit DS3 Framer block to transmit the FERF/RDI indicator to the
remote terminal equipment by setting both of the X-bits (within
each outbound DS3 frame) to "0".
0 - Does not force the Transmit DS3/E3 Framer block to transmit
the FERF/RDI indicator. In this case, the Transmit DS3/E3
Framer block will set the X bits (within each outbound DS3
frame) to the appropriate value, depending upon receive condi-
tions (as detected by the Receive DS3 Framer block).
1 - Forces the Transmit DS3/E3 Framer block to transmit the
FERF/RDI indicator. In this case, the Transmit DS3/E3 Framer
block will force the X bits (within each outbound DS3 frame) to
"0". Thereby transmitting the FERF/RDI indicator to the remote
terminal equipment.
NOTE: For normal operation (e.g., where the Transmit DS3/E3
Framer block will automatically transmit the FERF/RDI
indicator whenever the Receive DS3/E3 Framer block
declares either the LOS, AIS or LOF/OOF defect
condition), the user MUST set this bit-field to "0".
Force X bits to "1":
This READ/WRITE bit-field permits the user to force the Trans-
mit DS3 Framer block to set the X-bits (within each outbound
DS3 frame) to "1".
0 - Configures the Transmit DS3/E3 Framer block to automati-
cally set the X bits to the appropriate value, depending upon the
receive conditions (as detected by the Receive DS3 Framer
block).
1 - Configures the Transmit DS3/E3 Framer block to force all of
the "X" bits (within the outbound DS3 data-stream) to "1". In this
configuration setting the Transmit DS3/E3 Framer block sets all
X bits to "1" independent of whether the Receive DS3/E3 Framer
block is currently declaring any defect conditions.
NOTE: For normal operation (e.g., where the Transmit DS3/E3
Framer block automatically transmits the FERF/RDI
indicator whenever the Receive DS3/E3 Framer block
declares the LOS, AIS or LOF/OOF defect condition) the
user must set this bit-field to "0".
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