tdat04622 ETC-unknow, tdat04622 Datasheet - Page 91

• Manufacturer Part Number: tdat04622
• Description: Tdat Sonet/sdh 155/622/2488 Mbits/s Data Interfaces
• Manufacturer: ETC-unknow

Data Sheet
May 2001
Agere Systems Inc.
Functional Description
Path Terminator (PT) Block
I
I
I
I
I
I
1. NDF is not set (NDF bits are either 0110, 0111, 0100, or 0010),
2. There is no invalid pointer value,
3. There is a valid offset (0 to 782)
I
SPE Terminate
Receive Path Trace. The path trace message is extracted and stored in a 16-byte (SDH) or 64-byte (SONET)
memory for access by software. The first byte of the message can be provisioned to be either of the following:
I
I
The framing can also be disabled.
Receive Error Monitor. The PBIP block counts path BIP-8 errors. A theoretical maximum of 64,000 errors may be
detected per second. The PBIP block accumulates these errors in a 16-bit saturating counter. This counter is oper-
ated in latch and clear mode to ensure Bellcore and ITU compliance with regard to not missing any events (bit
errors). It is intended that this counter be polled at least once per second in order that no error events are missed.
The REI_P block counts remote error indication block errors.
Pointer Decrement. TDAT042G5 uses an 11-bit counter to count the number of pointer decrements and
updates the associated counter holding register on the occurrence of PMRST (RPI_DEC[A—D][10:0]; see regis-
ter description, page 198). A pointer decrement can occur when in the normal pointer mode. The following two
methods can be used to determine if the pointer decrement operation should be performed: 6-of-10 or 8-of-10
majority matching (selectable via software provisioning of register RINCDEC_6OR8MAJ [A—D]; see register
description, page 200).
Loss-of-Pointer. LOP-P is declared as shown in the above state diagram. In an LOP-P state, none of the path
overhead bytes are extracted.
AIS-P. The AIS-P is declared when the H1 and H2 bytes are set to all ones. In an AIS-P state, none of the path
overhead bytes are extracted.
Concatenated Pointer. A concatenated pointer is detected when the new data flag is set and the pointer offset
value is all ones.
New Pointer. TDAT042G5 uses a 13-bit counter to count the number of new data flags that occur and updates
the associated counter holding register on the occurrence of PMRST (RNDFCNT[A—D][12:0]; see register
description, page 198). TDAT042G5 uses a 3-of-4 majority voting scheme to determine if the new data flag is
set. Valid new data flags occur when the NDF bits are either 1001, 0001, 1101, 1011, or 1000.
Normal Pointer. A normal pointer occurs when all of the following conditions are true simultaneously:
Invalid Pointer. An invalid pointer is declared when neither a new data flag nor a normal pointer is detected.
For SDH mode, the byte with the most significant bit (MSB) set high (for SDH)
For SONET mode, the byte following a carriage return (0x0D) and line feed (0x0A) sequence
(continued)
(continued)
155/622/2488 Mbits/s Data Interface
TDAT042G5 SONET/SDH
63