TXC-04222-AIOG Transwitch Corporation, TXC-04222-AIOG Datasheet - Page 71

• Manufacturer Part Number: TXC-04222-AIOG
• Manufacturer: Transwitch Corporation

Specifications of TXC-04222-AIOG

• Screening Level: Industrial
• Package Type: BGA
• Lead Free Status / Rohs Status: Not Compliant

BITS 7 and 8
A multiframe alignment pattern, trace identifier message, TC RDI and TC ODI indications are assigned to bits
7 and 8 in the frames of a 76-frame structure, as shown below:
Loss of multiframe (status bits AnTCLM, BnTCLM) occurs when two consecutive Frame Alignment Signals
(1111 1111 1111 1110) are detected in error (i.e., one or more error in each FAS). Multiframe alignment is
recovered when one consecutive non-errored FAS are found.
The TC trace identifier message comparison is based on the same state machine as that used for the 16-byte
J2 message. The TC lock is removed when 3 messages are received in error and the AnTCLL or BnTCLL
alarm is declared. The TC lock is established when 3 valid, identical messages are received. A comparison is
performed between the microprocessor-written TC and the contents of the incoming message. The message
consists of TC Trace ID bytes 0 to 15. A TC Trace Identifier Mismatch (AnTCTM, BnTCTM) alarm is declared
when any byte does not match. Recovery occurs when there is a match between the microprocessor message
and the accepted message.
Bit 8 in frame 73 is defined as a Tandem Connection Remote Defect Indication (TC RDI). A TC RDI alarm
occurs when a 1 has been detected in bit 8 in frame 73 for five consecutive multiframes (where each multi-
frame is 38 ms). The TC RDI alarm state is exited when bit 8 is equal to 0 for five consecutive multiframes. An
alarm indication is reported as AnTCRDI or BnTCRDI.
Bit 7 in frame 74 is defined as a Tandem Connection Outgoing Defect Indication (TC ODI). A TC ODI alarm
occurs when a 1 has been detected in bit 7 in frame 74 for five consecutive multiframes (where each multi-
frame is 38 ms). The TC ODI alarm state is exited when bit 7 is equal to 0 for five consecutive multiframes. An
alarm indication is reported as AnTCODI or BnTCODI.
Tandem Connection Unequipped Status
Unequipped Tandem Connection detection is provided. Five or more consecutive received tandem connection
N2 bytes equal to XX00 0000 result in a TC unequipped indication (AnTCUQ, BnTCUQ). The alarm state is
exited when five or more consecutive received tandem connection N2 (Z6) bytes are not equal to XX00 0000.
Note that bits 1 and 2 of the N2 (Z6) byte are masked (shown as X) and do not affect the detection. The XX
represents a don’t care value and may be equal to a BIP-2 value.
Proprietary TranSwitch Corporation Information for use Solely by its Customers
Frame No.
21 thru 64
13 - 16
17 - 20
65 - 68
69 - 72
9 - 12
1 - 8
73
74
75
76
Frame Alignment, 1111 1111 1111 1110
TC Trace ID Byte No. 0 (1 CRC-7)
TC Trace ID Byte No. 1 (0 X X X X X X X)
TC Trace ID Byte No. 2 (0 X X X X X X X)
TC Trace ID Bytes No. 3 thru 13
TC Trace ID Byte No. 14 (0 X X X X X X X)
TC Trace ID Byte No. 15 (0 X X X X X X X)
Bit 7 = 0, Bit 8 = TC RDI
Bit 7 = TC ODI, Bit 8 = 0
Bit 7 = 0, Bit 8 = 0
Bit 7 = 0, Bit 8 = 0
DATA SHEET
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N2 Byte Definition
TXC-04222-MB, Ed. 6
TXC-04222
TEMx28
June 2003