XRT74L73
3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
PRELIMINARY
REV. P1.0.1
222
N
OTE
:
This bit is ignored when either the Tx AIS or the Tx
LOS bit is set.
4.2.4.2.1.4
Transmit AIS Pattern - Bit 4
This read/write bit field allows the user to transmit an
AIS pattern to the remote terminal equipment, upon
software control. Table 46 relates the contents of
this bit field to the Transmit DS3 Framer block’s ac-
tion.
N
OTE
:
This bit is ignored when the TxLOS bit is set.
4.2.4.2.1.5
Transmit LOS Pattern - Bit 3
This read/write bit field allows the user to transmit an
LOS (Loss of Signal) pattern to the remote terminal,
upon software control. Table 47 relates the contents
of this bit field to the Transmit DS3 Framer block’s ac-
tion.
T
ABLE
45: 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 Overhead bits are either internally generated, or they are inserted via the Transmit Overhead Data Input
Interface or the Transmit HDLC Controller blocks. The Payload bits are received from the Transmit Payload
Data Input Interface.
1
Transmit Idle Condition Pattern:
When this command is invoked, the Transmit DS3 Framer will do the following:
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
46: 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
B
LOCK
'
S
A
CTION
B
IT
4
T
RANSMIT
DS3 F
RAMER
’
S
A
CTION
0
Normal Operation:
The Overhead bits are either internally generated, or they are inserted via the Transmit Overhead Data Input
Interface or the Transmit HDLC Controller blocks. The Payload bits are received from the Transmit Payload
Data Input Interface.
1
Transmit AIS Pattern:
When this command is invoked, the Transmit DS3 Framer block 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