xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 299

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

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3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
2.2.9.5
The Transmit STS-3 TOH Processor Block supports the following functions.
• Transmitting the LOS (Loss of Signal) pattern (under Software control)
• Transmitting the AIS-L Pattern (under Software control)
• Transmitting the RDI-L Indicator (automatically and under Software control)
• Transmitting the REI-L Indicator (automatically and under Software control)
Each of these functions is discussed in some detail below.
2.2.9.5.1
The Transmit STS-3 TOH Processor block permits the user to transmit the LOS pattern to the remote terminal
equipment. The user can accomplish this by setting Bit 3 (LOS Force) within the Transmit STS-3 Transport –
SONET Transmit Control Register – Byte 0, as illustrated below.
Transmit STS-3 Transport – SONET Transmit Control Register – Byte 0 (Address = 0x1902)
Once the user executes this step, then the Transmit STS-3 TOH block will override all of the outbound data,
with an “All Zeros” pattern.
Note:
2.2.9.5.2
The Transmit STS-3 TOH Processor block permits the user to transmit the AIS-L (Line – Alarm Indication
Signal) indicator to the remote terminal equipment, under software control.
Forced Transmission of the AIS-L Indicator
The user can command the Transmit STS-3 TOH Processor block to transmit the AIS-L indicator by setting
Bit 4 (AIS-L Force) within the Transmit STS-3 Transport – SONET Transmit Control Register – Byte 0, to “1”
as illustrated below.
Transmit STS-3 Transport – SONET Transmit Control Register – Byte 0 (Address = 0x1902)
Once the user executes this step, then the Transmit STS-3 TOH Processor Block will overwrite all of the Line
Overhead, and STS-3 Envelope Capacity bytes, with an “All Ones” pattern. Only the Section Overhead bytes
will be unaffected by this register bit setting.
Note:
M0M1 Insert
M0M1 Insert
Method[0]
Method[0]
B
B
R/W
R/W
IT
IT
0
0
7
7
When this bit-field is set, it overrides all of the other bits in this register.
This bit-field is ignored when the “LOS Force” bit-field is set to “1”.
TRANSMISSION OF ALARM CONDITIONS
TRANSMISSION OF AIS-L INDICATOR
TRANSMISSION OF THE LOS CONDITION
Unused
Unused
B
B
R/O
R/O
IT
IT
0
0
6
6
RDI-L Force
RDI-L Force
B
B
R/W
R/W
IT
IT
0
0
5
5
AIS-L Force
AIS-L Force
B
B
R/W
R/W
IT
IT
0
1
4
4
299
LOS Force
Force
B
B
LOS
R/W
R/W
IT
IT
1
0
3
3
Scramble
Scramble
Enable
Enable
B
B
R/W
R/W
IT
IT
0
0
2
2
B2 Error
B2 Error
Insert
Insert
B
B
R/W
R/W
IT
IT
0
0
1
1
XRT94L33
A1A2 Error
A1A2 Error
Rev.1.2.0.
Insert
Insert
B
B
R/W
R/W
IT
IT
0
0
0
0