TXC-04252AIPQ Transwitch Corporation, TXC-04252AIPQ Datasheet - Page 61

• Manufacturer Part Number: TXC-04252AIPQ
• Manufacturer: Transwitch Corporation

Specifications of TXC-04252AIPQ

• Pin Count: 160
• Screening Level: Industrial
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

REMOTE DEFECT INDICATIONS
A 1-Bit/3-Bit RDI Selection bit - 1BnRDI (bit 4 in registers 048H, 078H, 0A8H, 0D8H) - has been added to allow
the user to select between the Enhanced 3-Bit RDI (1BnRDI = 0) or Single Bit RDI (1BnRDI = 1). The following
sections describe the differences.
V5 and K4 (Z7) Byte Coding (for 3-Bit RDI)
Bits 5, 6 and 7 in the K4 (Z7) byte, in conjunction with bit 8 in the V5 byte, provide a detection scheme which is
compliant with earlier versions of the RDI standard and also with enhanced TU/VT RDI capability. The
enhanced version of RDI allows the user to differentiate between server, connectivity, and payload defects. Bit
8 in V5 is set equal to bit 5 in K4 (Z7). Bit 7 in K4 (Z7) is set to the inverse of bit 6 of K4 (Z7) to distinguish the
enhanced version of RDI from the old version of RDI. It should be noted that when bits 6 and 7 in K4 (Z7) are
either 01 or 10, the RDI indication is also influenced by Bit 8 of V5, as shown in the table below. When bits 6
and 7 are either 00 or 11, then RDI is determined solely by bit 8 in V5. This allows detection of an RDI originat-
ing from older equipment that generates the RDI in the V5 byte. The following table lists the RDI defect indica-
tions carried in the V5 and K4 (Z7) bytes.
Bit 5 K4 (Z7)
Bit 8 V5
0
0
0
0
1
1
1
1
Proprietary TranSwitch Corporation Information for use Solely by its Customers.
Bit 6 K4 (Z7)
0
0
1
1
0
0
1
1
RDI Bit Assignment for 3-Bit RDI
Bit 7 K4 (Z7)
0
1
0
1
0
1
0
1
DATA SHEET
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No defect indications.
No defect indications.
Remote Payload Defect
- Path Label Mismatch
- Loss of Multiframe.
No defect indications.
Remote defect (old equipment).
Remote Server Defect
- VT Loss of Pointer
- VT AIS detected
- Upstream AIS detected (E1 or H1/H2 Bytes).
Remote Connectivity Defect
- Unequipped Signal Label
- J2 Mismatch
- J2 Loss of Lock
Remote defect (old equipment).
Definition
Ed. 3, December 2000
TXC-04252
TXC-04252-MB
QE1M