xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 300

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

XRT94L33
Rev.1.2.0.
2.2.9.5.3
The Transmit STS-3 TOH Processor block provides the user with two options associated with transmitting the
Line-Remote Defect Indicator (RDI-L).
• Forced transmission of the RDI-L indicator (e.g., under Software control).
• Automatic transmission of the RDI-L indicator
Each of these options is discussed below.
2.2.9.5.3.1
The XRT94L33 permits the user to force the Transmit STS-3 TOH Processor block to transmit the RDI-L
indicator to the remote terminal equipment. The user can accomplish this by setting Bit 5 (RDI-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)
If the user opts to transmit an RDI-L indicator, then bits 6, 7 and 8 (of the K2 byte, within each outbound STS-
3c frame) will be set to the value [1, 1, 0].
Note:
In this case, if the user wishes to terminate the Transmit STS-3c TOH Processor Block’s transmission of the
RDI-L indicator, then they only need to set Bit 5 back to “0”.
2.2.9.5.3.2
The Transmit STS-3 TOH Processor block permits the user to configure it to automatically transmit the RDI-L
indicator, in response to the following conditions.
• The corresponding Receive STS-3 TOH Processor block declares an LOS (Loss of Signal) condition.
• The corresponding Receive STS-3 TOH Processor block is declaring an LOF (Loss of Frame) condition.
• The corresponding Receive STS-3 TOH Processor block is declaring the AIS-L condition.
Bits 0 through 2, within the Transmit STS-3 Transport – RDI-L Control Register, permits the user configure
the Transmit STS-3 TOH Processor block to support the “Automatic Transmission of an RDI-L indicator upon
detection of these conditions. These bit-fields are highlighted and defined below.
M0M1 Insert
Method[0]
B
R/W
IT
0
7
This bit-field is ignored when either the “LOS Force” or the “AIS-L Force” bit-fields are set to “1”.
TRANSMISSION OF THE RDI-L INDICATOR
Forced Transmission of the RDI-L Indicator (under Software Control)
Unused
Automatic Transmission of the RDI-L (Line – Remote Defect Indicator)
B
R/O
IT
0
6
RDI-L Force
B
R/W
IT
1
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
5
AIS-L Force
B
R/W
IT
0
4
300
LOS Force
B
R/W
IT
0
3
Scramble
Enable
B
R/W
IT
0
2
B2 Error
Insert
B
R/W
IT
0
1
xr
A1A2 Error
Insert
B
R/W
IT
0
0