
XRT94L33
xr
Rev.1.2.0.
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
304
2.2.9.5.4.2
Configuring the Transmit STS-3 TOH Processor block to transmit the REI-L indicator,
upon Software Command
The user can configure the Transmit STS-3 TOH Processor block to transmit the REI-L indicator (per software
command) by executing the following steps.
STEP 1 – Write the value “0” into Bit 0 (M0M1 Insert Method[1]) within the “Transmit STS-3 Transport
– SONET Transmit Control Register – Byte 1” as depicted below.
Transmit STS-3Transport – SONET Transmit Control Register – Byte 1 (Address = 0x1902)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Reserved
E2 Insert
Method
E1 Insert
Method
F1 Insert
Method
S1 Insert
Method
K1K2 Insert
Method
M0M1 Insert
Method[1]
R/O
R/W
0
STEP 2 – Write the value “1” into Bit 7 (M0M1 Insert Method[0]) within the “Transmit STS-3 Transport
– SONET Transmit Control Register – Byte 0” as depicted below.
Transmit STS-3 Transport – SONET Transmit Control Register – Byte 0 (Address = 0x1902)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
M0M1 Insert
Method[0]
Unused
RDI-L Force
AIS-L Force
LOS Force
Scramble
Enable
B2 Error
Insert
A1A2 Error
Insert
R/W
R/O
R/W
1
0
Steps 1 and 2 configure the Transmit STS-3 TOH Processor block to automatically read out the contents of
Bit 0 through 3 (of the Transmit STS-3 Transport – M0M1 Byte Value Register) and write the value of these
bits into Bits 5 through 8 (of the M0M1 byte) within the “outbound” STS-3 frame.
The bit-format of the
“Transmit STS-3 Transport – Transmit M0M1 Byte Value” Register (with the appropriate bits “shaded”) is
presented below.
Transmit STS-3 Transport – M0M1 Value Register (Address = 0x1937)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Transmit_M0M1_Byte_Value[7:0]
R/W
0
In this mode, the user can transmit an “un-erred” REI-L value by setting Bits 0 through 3 (of the Transmit
STS-3 Transport – Transmit M0M1 Byte Value Register) to “[0, 0, 0, 0]”. Conversely, the user can transmit an
“erred” REI-L value by setting bits 0 through 3 (within the Transmit STS-3 Transport – Transmit M0M1 Byte
Value Register) to some value between 1 and 8.
AUTOMATIC TRANSMISSION OF THE REI-L INDICATOR
The Transmit STS-3 TOH Processor block will transmit the Line – Remote Error Indicator to the remote
terminal equipment. In an STS-3 frame, the REI-L indicator will be transmitted within the M0 byte. The bit-
format