
XRT79L71
PRELIMINARY
499
1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMERLIU COMBO - CC/HDLC ARCHITECTURE
REV. P2.0.0
STEP 1 - Set Bit 1 (TxLOS Enable) within the Transmit E3 Configuration Register, to "1" as depicted
below.
Once the user executes this step, then the Transmit DS3/E3 Framer block will override all of the outbound E3
data, payload and overhead bits, with an All Zeros pattern.
6.2.6.2
TRANSMITTING THE E3 AIS PATTERN
The Transmit DS3/E3 Framer block permits the user upon Software Control to transmit the E3 AIS indicator
which is an Unframed All Ones Pattern to the remote terminal equipment. The user can invoke this feature by
setting Bit 2 (TxAIS Enable) within the Transmit E3 Configuration Register, to "1" as depicted below.
Once the user executes this step, then the Transmit DS3/E3 Framer block will override the contents of all
outbound E3 data, with this E3 AIS (e.g., an Unframed, All Ones) Pattern.
6.2.6.3
TRANSMITTING THE FERF/RDI INDICATOR
The Transmit E3 Framer block provides the user with two options associated with transmitting the FERF (Far-
End Receive Failure) condition, within the outbound E3 data-stream.
Forced transmission of the FERF indicator (e.g., under Software control)
Automatic transmission of the FERF indicator
6.2.6.3.1
Forced Transmission of the FERF/RDI Indicator
The XRT79L71 permits the user to force the Transmit E3 Framer block to transmit the FERF indicator to the
remote terminal equipment. The user can accomplish this by executing the following steps.
STEP 1 - Write the value "0x80" into the Transmit E3 MA Byte Register, as depicted below.
Transmit E3 Configuration Register - G.832 (Direct Address = 0x1130)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
TxDL in NR
Reserved
TxAIS
Enable
TxLOS
Enable
Transmit MA
Byte based
upon
Receive
Conditions
R/O
R/W
R/O
R/W
0
1
0
Transmit E3 Configuration Register - G.832 (Direct Address = 0x1130)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
TxDL in NR
Reserved
TxAIS
Enable
TxLOS
Enable
Transmit MA
Byte based
upon
Receive
Conditions
R/O
R/W
R/O
R/W
0
1
0