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PRELIMINARY
DS3 UNI FOR ATM
XRT7245
REV. 1.03
77
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.
For more information on this feature, please see
Section 6.4.3.2.5.
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.
Writing a “0” to this bit-field disables this feature.
For more information on this feature, please see
Section 6.4.3.2.6.
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. Writing
a “0” to this bit-field disables this feature.
For more information on this feature, please see
Section 6.4.3.2.7.
Bit 0—FERF on AIS
This “Read/Write” bit-field allows the user to configure
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.
Writing a “0” to this bit-field disables this feature.
For more information on this feature, please see
Section 6.4.3.2.8.
3.3.2.23
Tx DS3 M-Bit Mask Register
Bit 7-5: TxFEBEDat[2:0]
These three (3) “read/write” bit-fields, along with Bit 4
of this register, allow the user to configure and trans-
mit his/her choice for FEBE bits in each outgoing
DS3 Frame. The user will write his/her value for the
FEBE bits into these bit-fields. The Transmit DS3
Framer will insert these values into the FEBE bit-
fields of each outgoing DS3 Frame, once the user
has written a “1” to Bit 4 (FEBE Register Enable).
For more information on this feature, please see
Section 6.4.3.1.4.
Bit 4—FEBE Register Enable
This “Read/Write” bit-field allows the user to configure
the Transmit DS3 Framer to insert the contents of
TxFEBEDat[2:0] into the FEBE bit-fields each outgo-
ing DS3 Frame.
Writing a “0” to this bit-field disables this feature (e.g.,
the Transmit DS3 Framer will transmit the internally
generated FEBE bits). Writing a “1” to this bit-field
enables this feature (e.g., the internally generated
FEBE bits are overwritten by the contents of the
TxFEBEDat[2:0] bit-field).
For more information on this feature, please see
Section 6.4.3.1.4.
Bit 3—Transmit Erred P-Bit
This “Read/Write bit-field allows the user to insert er-
rors into the P-bits of the outgoing DS3 frames (via the
Transmit DS3 Framer). If the user enables this feature,
then the Transmit DS3 Framer will proceed to invert
each and every P-bit, from its computed value, prior
to transmission to the “Far-end” Terminal.
Writing a “0” to this bit-field (the default condition)
disables this feature (e.g., the correct P-bits are sent).
Writing a “1” to this bit-field enables this feature (e.g.,
the incorrect P-bits are sent).
Address = 17h, Tx DS3 M-Bit Mask Register
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
TxFEBEDat[2:0]
FEBE Reg Enable
Tx Error P-Bit
M-Bit Mask(2)
M-Bit Mask(1)
M-Bit Mask(0)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0