xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 218

• 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.
2.2.7.3
The Transmit STS-3c POH Processor block supports the following functions.
• Transmitting the AIS-P Pattern (under Software control)
• Transmitting the RDI-P Indicator (automatically and under Software control)
• Transmitting the REI-P Indicator (automatically and under Software control)
Each of these operations is discussed in detail below.
2.2.7.3.1
The Transmit STS-3c POH Processor block can be configured to generate and transmit the AIS-P (Path AIS)
indicator to the remote PTE, under software control.
The user can accomplish this by setting Bit 0 (Transmit AIS-P Enable) within the “Transmit STS-3c Path –
SONET Control Register – Byte 0” to “1”, as depicted below.
Transmit STS-3c Path – SONET Control Register – Byte 0 (Address = 0x1983)
Once the user executes this step, then the “Transmit STS-3c POH Processor” block will do the following.
• It will set all bytes, within the STS-3c SPE to an “All Ones” pattern.
• It will set the H1, H2 and H3 bytes (within the TOH) to an “All Ones” pattern.
Please note that whenever the user configures the Transmit STS-3c POH Processor block to transmit the
AIS-P indicator, then no ATM cells or PPP packets will be transmitted to the remote terminal.
2.2.7.3.2
The Transmit STS-3c POH Processor block can be configured to transmit the RDI-P indicator either
automatically, upon software control or via the “TxPOH_n” external input port as described below.
2.2.7.3.2.1
The user can configure the Transmit STS-3c POH Processor block to automatically transmit the RDI-P
indicator whenever the corresponding Receive STS-3c POH Processor block declares a PLM-P (Path –
Payload Label Mismatch), UNEQ-P (Path – Unequipped), LOP-P (Path – Loss of Pointer), AIS-P, TIM-P
(Path - Trace Identification Mismatch), and LCD-P (Path – Loss of Cell Delineation) condition.
The procedure for configuring the Transmit STS-3c POH Processor block to automatically transmit the RDI-P
indicator, for each of the above-mentioned defects is presented below.
2.2.7.3.2.2
The user can configure the Transmit STS-3c POH Processor block to automatically transmit the RDI-P
indicator, in response to the corresponding Receive STS-3c POH Processor block declaring the PLM-P
condition, by executing the following steps.
F2 Insertion
B
Type
R/W
IT
0
7
TRANSMISSION OF PATH-ALARM CONDITIONS
TRANSMISSION OF THE AIS-P PATTERN
TRANSMISSION OF THE RDI-P INDICATOR
REI-P Insertion Type[1:0]
Configuring the Transmit STS-3c POH Processor block to automatically transmit the
RDI-P Indicator
Configuring the Transmit STS-3c POH Processor block to automatically transmit RDI-
P, in response to declaration of the PLM-P Condition
B
R/W
IT
0
6
B
R/W
IT
0
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
5
RDI-P Insertion Type[1:0]
B
R/W
IT
0
4
218
B
R/W
IT
0
3
Insertion
C2 Byte
B
Type
R/W
IT
0
2
Unused
B
R/O
IT
0
1
xr
Transmit
Enable
AIS-P
B
R/W
IT
1
0