XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 258

• Manufacturer Part Number: XRT94L33IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L33IB-L

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT94L33
Rev.1.2.0.
2.2.8.3
The Transmit SONET 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.
2.2.8.3.1
The Transmit SONET 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 SONET Path –
SONET Control Register – Byte 0” to “1”, as depicted below.
Transmit SONET Path – SONET Control Register – Byte 0 (Address = 0xN983)
Once the user executes this step, then the “Transmit SONET POH Processor” block will do the following.
• It will set all bytes, within the STS-1 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 SONET POH Processor block to transmit the
AIS-P indicator, then no ATM cells or PPP packets will be transmitted to the remote terminal.
2.2.8.3.2
The Transmit SONET 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.
2.2.8.3.2.1
The user can configure the Transmit SONET POH Processor block to automatically transmit the RDI-P
indicator whenever the corresponding Receive SONET 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 SONET POH Processor block to automatically transmit the RDI-P
indicator, for each of the above-mentioned defects is presented below.
2.2.8.3.2.2
The user can configure the Transmit SONET POH Processor block to automatically transmit the RDI-P
indicator, in response to the corresponding Receive SONET 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 SONET POH Processor block to automatically transmit the
RDI-P Indicator
Configuring the Transmit SONET 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
258
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