XRT72L13 Datasheet, PDF (228/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
áç
PRELIMINARY
Framer will generate X-bits based upon the receive
conditions.
Writing a "1" to this bit-field invokes this command. In
this case, the Transmit DS3 Framer will overwrite the
internally-generated X-bits and set them all to "1".
NOTE: For more information on this feature, please see
Section _.
NOTE: This bit-setting is ignored if Bits 3, 4, 5, or 7 (within
this register) are set to "1".
Bit 5 - Tx Idle (Pattern)
This "Read/Write" bit-field allows the user to com-
mand the Transmit DS3 Framer to transmit the "Idle
Condition" pattern. If the user invokes this com-
mand, then the Transmit DS3 Framer will force the
outbound DS3 Frames to have the following patterns.
• Valid M-bits, F-bits and P-bits
• The three CP-Bits (F-frame #3) are "0"
• The X-bits are set to "1"
• A repeating "1100..." pattern in written into the pay-
load portion of the DS3 Frames.
Writing a "1" to this bit-field invokes this command.
Writing a "0" allows the Transmit DS3 Framer to func-
tion normally (e.g., the Transmit DS3 Framer will
transmit its payload and internally generated over-
head bits).
NOTE: For more information on this feature, please see
Section _.
NOTE: This bit-setting is ignored if Bits 3 or 4 (within this
register) are set to "1".
Bit 4 - Tx AIS (Pattern)
This "Read/Write" bit-field allows the user to com-
mand the Transmit DS3 Framer to transmit an "AIS"
pattern. If the user invokes this command, then the
Transmit DS3 Framer will force the outbound DS3
frames to have the following patterns.
• Valid M-bits, F-bits, and P-bits
• All C-bits are set to '0'
• All X-bits are set to '1'
• A repeating '1010...' pattern is written into the pay-
load of the DS3 Frames.
Writing a "1' to this bit-field invokes this command.
Writing a "0" allows the Transmit DS3 Framer to func-
tion normally (e.g., the Transmit DS3 Framer will
transmit its payload and internally generated over-
head bits).
NOTE: For more information on this feature, please see
Section _.
Bit 3 - Tx LOS (Loss of Signal)
This "Read/Write" bit-field allows the user to com-
mand the Transmit DS3 Framer to simulate an "LOS
Condition". If the user invokes this command, then
the Transmit DS3 Framer will stop sending "mark"
pulses out on the line; and will transmit an all-zero
pattern.
Writing a '0' to this bit-field disables (or shuts off) this
feature, thereby allowing internally generated DS3
Frames to be generated and transmitted over the line.
Writing a '1' to this bit-field invokes this command,
causing the Transmit DS3 Framing to generate an all
'0' pattern.
NOTE: For more information on this feature, please see
Section _.
Bit 2 - FERF on LOS
This "Read/Write" bit-field allows the user to config-
ure the Transmit DS3 Framer to generate a "Yellow
Alarm" if the Near-End Receive DS3 Framer detects
a "LOS" (Loss of Signal) Condition.
Writing a "1" to this bit-field enables this feature. Writ-
ing a "0" to this bit-field disables this feature.
NOTE: For more information on this feature, please see
Section _.
Bit 1 - FERF on OOF
This "Read/Write" bit-field allows the user to config-
ure the Transmit DS3 Framer to generate a "Yellow
Alarm" if the Near-End Receive DS3 Framer detects
an "OOF (Out-of-Frame) Condition".
Writing a "1" to this bit-field enables this feature. Writ-
ing a "0" to this bit-field disables this feature.
NOTE: For more information on this feature, please see
Section _.
Bit 0 - FERF on AIS
This "Read/Write" bit-field allows the user to config-
ure the Transmit DS3 Framer to generate a "Yellow
Alarm" if the Near-End Receive DS3 Framer detects
an AIS (Alarm Indication Signal) Condition.
Writing a "1" to this bit-field enables this feature. Writ-
ing a "0" to this bit-field disables this feature.
NOTE: For more information on this feature, please see
Section _.
3.3.2.45 TxDS3 FEAC Configuration and Status
Register
216