x r
PRELIMINAZRY
E3 UNI FOR ATM
XRT7234
REV. P1.0.0
73
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 6, 5—TxLAPD Type[1:0]
These two “Read/Write” bit-fields allow the user to specify the type and size of LAPD Message frame that he/
she wishes to transmit to the “Far End” LAPD Receiver. The following table relates the contents of these bit-
fields to the LAPD Message frame type.
Bit 4—DLinNR
This “Read/Write” bit-field allows the user to specify whether the LAPD Transmitter should insert the “out-
bound” LAPD Message frame octets into the NR byte-field, or in the GC-byte-field, within each outbound E3
frame.
Writing a “1” configures the LAPD Transmitter to insert the octets of the outbound LAPD Message frame into the
NR byte-field, within each outbound E3 frame. Writing in “0” configures the LAPD Transmitter to insert the
octets of the outbound LAPD Message frame into the GC byte-field, within each outbound E3 frame.
Bit 3—No Data Link (LAPD Transmitter Enable/Disable)
This “Read/Write” bit-field allows the user to enable or disable the LAPD Transmitter.
Writing a “1” to this bit-field causes the LAPD Transmitter to be disabled, and to not insert any outbound LAPD Mes-
sage frame octets into the NR or GC byte-fields of the outbound E3 frames. Conversely, writing a “0” to this bit-
field enables the LAPD Transmitter, for transmission of any outbound LAPD Message frames.
Bit 2—TxAIS Enable
This “Read/Write” bit-field allows the user to command the Transmit E3 Framer to transmit an AIS pattern, upon
demand.
Writing a “0” to this bit-field allows the Transmit E3 Framer to transmit internally generated data (e.g., the ITU-T
G.832 compatible E3 frames with ATM cell data) to the “Far-End” Terminal. Writing a “1” to this bit-field causes
the Transmit E3 Framer to transmit an all “1s” pattern to the “Far-End” Terminal.
Note: If the Transmit E3 Framer is transmitting an AIS pattern to the “Far-End” Terminal, then it is not transmit-
ting any E3 frames or ATM cell data. Consequently, if this command is invoked, the “Far End” Terminal will
experience an “OOF” (Out of Frame) and an “LCD” (Loss of Cell Delineation) Condition.
Bit 1—TxLOS Enable
This “Read/Write” bit-field allows the user to command the Transmit E3 Framer to transmit an LOS pattern, upon
demand.
Writing a “0” to this bit-field allows the Transmit E3 Framer to transmit internally generated data (e.g., the ITU-T
G.832 compatible E3 frames with ATM cell data) to the “Far-End” Terminal. Writing a “1” to this bit-field causes the
Transmit E3 Framer to transmit an “All 0s” pattern to the “Far-End” Terminal.
Note: If the Transmit E3 Framer is transmitting an LOS pattern to the Far-End Terminal, then it is not transmit-
ting any E3 frames or ATM cell data. Consequently, the “Far-End” Terminal will experience an “LOS” (Loss of
Signal), “OOF” (Out of Frame), and an “LCD” (Loss of Cell Delineation) condition.
TxLAPDType[1:0]
LAPD Message Frame Type
PMDL Message Size (Information Section)
00
Test Signal Identification Type
76 Bytes
01
Idle Signal Identification Type
76 Bytes
10
CL Path Identification Type
76 Bytes
11
ITU-T Path Identification Type
82 Bytes