XRT7245
DS3 UNI FOR ATM
á
PRELIMINARY
REV. 1.03
202
Note:
This bit is ignored when either the “Tx AIS” or the
“Tx LOS” bit is set.
6.4.4.2.4
This “read/write” bit field allows the user to transmit
an AIS pattern to the “Far End” Receiver, upon soft-
ware control. The following table relates the contents
of this bit field to the Transmit DS3 Framer’s action.
Transmit AIS Pattern—Bit 4
Note:
This bit is ignored when the TxLOS bit is set.
6.4.4.2.5
This “read/write” bit field allows the user to transmit
an LOS (Loss of Signal) pattern to the “Far-End”
Transmit LOS Pattern—Bit 3
Receiver, upon software control. The following table
relates the contents of this bit field to the Transmit
DS3 Framer’s action.
Note:
When this bit is set, it overrides all of the other bits in
this register.
T
ABLE
37: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
5 (T
X
I
DLE
)
WITHIN
THE
T
X
DS3 C
ONFIGURATION
R
EGISTER
,
AND
THE
RESULTING
T
RANSMIT
DS3 F
RAMER
A
CTION
B
IT
5
T
RANSMIT
DS3 F
RAMER
’
S
A
CTION
0
Normal Operation:
The OH- and Payload-bits are generated and/or transmitted by the UNI based upon “Near
End Receive Conditions” (e.g., the Receive DS3 Framer of this UNI chip)
1
Transmit Idle Condition Pattern.
When this command is invoked, the Transmit DS3 Framer will do the follow-
ing:
Set the X-bits to “1”
Set the CP-Bits (F-Frame #3) to “0”
Generate Valid M, F, and P bits
Overwrite the data in the DS3 payload with a repeating “1100...” pattern.
T
ABLE
38: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
4 (T
X
AIS P
ATTERN
)
WITHIN
THE
T
X
DS3
C
ONFIGURATION
R
EGISTER
,
AND
THE
RESULTING
T
RANSMIT
DS3 F
RAMER
A
CTION
B
IT
4
T
RANSMIT
DS3 F
RAMER
’
S
A
CTION
0
Normal Operation: The X-bits are generated by the UNI based upon “Receiving Conditions” (via the Receive
Section of the UNI chip)
1
Transmit AIS Pattern. When this command is invoked, the Transmit DS3 Framer will do the following.
Set the X-bits to “1”
Set all the C-bits to “0”
Generate valid M, F, and P bits
Overwrite the data in the DS3 payload with a repeating “1010...” pattern
T
ABLE
39: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
3 (T
X
LOS)
WITHIN
THE
T
X
DS3 C
ONFIGURATION
R
EGISTER
,
AND
THE
RESULTING
T
RANSMIT
DS3 F
RAMER
A
CTION
B
IT
3
T
RANSMIT
DS3 F
RAMER
’
S
A
CTION
0
Normal Operation:
The OH- and Payload-bits are generated by the Transmit DS3 Framer based upon “Near
End” Receiving Conditions” (via the Receive Section of the UNI chip), and ATM Layer processor transmission
requirements.
1
Transmit LOS Pattern:
When this command is invoked the Transmit DS3 Framer will do the following.
Set all OH bits to “0” (including the M, F, and P bits)
Overwrite the DS3 payload with an “all zero” pattern.