
XRT94L33
xr
Rev.1.2.0.
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
236
Transmit STS-3c Path – SONET Control Register – Byte 0 (Address = 0x1983)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
F2 Insertion
Type
REI-P Insertion Type[1:0]
RDI-P Insertion Type[1:0]
C2 Byte
Insertion
Type
Unused
Transmit
AIS-P
Enable
R/W
R/O
R/W
0
This step configures the Transmit STS-3c POH Processor block to read out the contents of the “Transmit
STS-3c Path – Transmit C2 Byte Value” register; and load this value into the C2 byte position within each
“outbound” STS-3c SPE.
STEP 2 – Write the desired byte value (for the outbound C2 byte) into the “Transmit STS-3c Path –
Transmit C2 Byte Value” register.
The bit-format of this register is presented below.
Transmit STS-3c Path – Transmit C2 Byte Value Register (Address = 0x199F)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Transmit_C2_Byte_Value[7:0]
R/W
0
2.2.7.3.5.2
Setting and Controlling the Outbound C2 Byte via the “TxPOH_n Input Port”
The Transmit STS-3c POH Processor block permits the user to specify the contents of the C2 byte, within the
“outbound” STS-3c SPE, via data applied to the “TxPOH_n” input pin.
The user can configure the Transmit STS-3c POH Processor block to accomplish this by performing the
following steps.
STEP 1 – Write the value “1” into Bit 2 (C2 Byte Insertion Type) within the “Transmit STS-3c Path –
SONET Control Register – Byte 0”, as depicted below.
Transmit STS-3c Path – SONET Control Register – Byte 0 (Address = 0x1983)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
F2 Insertion
Type
REI-P Insertion Type[1:0]
RDI-P Insertion Type[1:0]
C2 Byte
Insertion
Type
Unused
Transmit
AIS-P
Enable
R/W
R/O
R/W
0
1
0
This step configures the Transmit STS-3c POH Processor block to use the “TxPOH_n” input port as the
source for the C2 byte, within each “outbound” STS-3c SPE.
In this mode, the Transmit STS-3c POH
Processor block will accept the value, corresponding to the C2 byte (via the “TxPOH_n” input port) and it will
write this data into the C2 byte position, within the “outbound” STS-3c SPE.
STEP 2 – Begin providing the values of the “outbound” C2 byte to the “TxPOH_n” input port.
The procedure for applying the C2 byte to the “TxPOH_n” input port is presented below.