
XRT7245
DS3 UNI FOR ATM
á
PRELIMINARY
REV. 1.03
76
3.3.2.22
Tx DS3 Configuration Register
Bit 7—Tx Yellow Alarm
This “Read/Write” bit-field allows the local μP to com-
mand the Transmit DS3 Framer to transmit a “Yellow
Alarm” (e.g., X bits are all “0”) in the outgoing DS3
data stream.
Writing a “0” to this bit-field disables this feature (the
default condition). In this condition, the X-bits in the
out-bound DS3 frame, are internally generated
(based upon receiver conditions).
Writing a “1” to this bit-field invokes this command. In
this condition, the Transmit DS3 Framer will override
the internally-generated X-bits and force all of the
X-bits of each outbound DS3 frame to “0”.
For more information in this feature, please see
Section 6.4.3.2.1.
Note:
This bit-setting is ignored if Bits 3, 4 or 5 (within this
register) are set to “1”.
Bit 6—Tx X-Bit (Force X bits to “1”)
This “Read/Write” bit-field allows the user to com-
mand the Transmit DS3 Framer to force all of the
X-bits, in the outbound DS3 Frames, to “1”.
Writing a “0” to this bit-field disables this feature (the
default condition). In this case, the Transmit DS3
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”.
For more information on this feature, please see
Section 6.4.3.2.2.
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 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
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).
For more information on this feature, please see
Section 6.4.3.2.3.
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).
For more information on this feature, please see
Section 6.4.3.2.4.
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
Address = 16h, Tx DS3 Configuration 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
Tx Yellow
Alarm
Tx X-Bit
Tx Idle
Tx AIS
Tx LOS
FERF on
LOS
FERF on
OOF
FERF on AIS
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
1
1
1