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XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER WITH HDLC CONTROLLER
REV. 1.2.1
104
Setting this bit-field to "1" configures the Transmit Section of the Channel to use the Input Interface as the
source for the FAS pattern.
NOTE: For more information on the FAS pattern, refer to
2.3.7.2
Transmit E3 LAPD Configuration Register (ITU-T G.751)
Bit 3 - Auto Retransmit
This Read/Write bit-field permits the user to configure the LAPD Transmitter to either transmit the LAPD
Message frame only once, or repeatedly at one-second intervals.
Writing a "0" to this bit-field configures the LAPD Transmitter to transmit the LAPD Message frame once.
Afterwards, the LAPD Transmitter will halt transmission, until it has commanded to transmit another LAPD
Message frame.
Writing a "1" to this bit-field configures the LAPD Transmitter to transmit the LAPD Message frame repeatedly
at One-Second intervals. In this configuration, the LAPD Transmitter will repeat its transmission of the LAPD
Message frame until it has been disabled.
Bit 1 - TxLAPD Message Length Select
This Read/Write bit-field permits the user to select the length of the outbound LAPD Message frame.
Setting this bit-field to "0" configures the outbound LAPD Message frame to be 76 bytes in length. Setting this
bit-field to "1" configures the outbound LAPD Message frame to be 82 bytes in length.
NOTE: This should match with the message type of the LAPD message to be sent. (See
Bit 0 - TxLAPD Enable
This Read/Write bit-field permits the user to enable or disable the LAPD Transmitter. The LAPD Transmitter
must be enabled before it can be commanded to transmit a LAPD Message frame (containing a PMDL
message) via the outbound E3 frames, to the Remote Terminal.
Writing a "0" disables the LAPD Transmitter (default condition). Writing a "1" enables the LAPD Transmitter.
NOTE: For information on the LAPD Transmitter, refer to
2.3.7.3
Transmit E3 LAPD Status and Interrupt Register (ITU-T G.751)
Bit 3 - TxDL Start
This Read/Write bit-field permits the user to command the LAPD Transmitter to do the following.
Read in the PMDL Header and Message from the Transmit LAPD Message Buffer. (80 or 86 bytes)
TxE3 LAPD Configuration Register (Address = 0x33)
BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0
Not Used
Auto Retrans-
mit
Not Used
TxLAPD
Msg Length
TxLAPD
Enable
RO
R/W
RO
R/W
0
0001
000
TxE3 LAPD Status and Interrupt Register (Address = 0x34)
BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0
Not Used
TXDL Start
TXDL Busy
TxLAPD
Interrupt
Enable
TxLAPD
Interrupt
Status
RO
R/W
RO
R/W
RUR
0
0000
000