TXC-04222-AIOG Transwitch Corporation, TXC-04222-AIOG Datasheet - Page 70

• 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

June 2003
TEMx28
TXC-04222
TXC-04222-MB, Ed. 6
8. Once the incoming trace message is in-lock, the stable message, is compared against the microproces-
10. If the incoming message changes for three consecutive 16-byte messages, a loss of lock alarm
N2 Byte (Tandem Connection)
The Tandem Connection feature is enabled by writing a 1 to control bit ARnTCEN (bit 5, X+010H) for the A
drop side or BRnTCEN (bit 5, X+080H) for the B drop side, when control bit ARnJ2S1 (bit 1, X+010H) and
BRnJ2S1 (bit 1, X+080H) is a 0. When control bit ARnJ2S1 (BRnJ2S1) is written with a 1, the Tandem Con-
nection feature for the A Drop (B Drop) VT/TU is disabled. When control bit ARnTCEN or BRnTCEN is written
with a 0, the tandem connection feature is disabled. The bit placement in a received N2 byte configured for
Tandem Connection operation is shown below:
TC BIP-2 Processing
One or two errors may be detected in the TC BIP-2 comparison, and they are counted individually in an 8-bit
counter when control bit BLOCK (bit 4, 01AH) is written with a 0. When control bit BLOCK is written with a 1,
one or two parity errors are counted as a single block error.
TC AIS Indication
A tandem connection AIS alarm (AnTCAIS, BnTCAIS) is declared when bit 4 is equal to 1 for five consecutive
frames. Recovery occurs when bit 4 is equal to 0 for five consecutive frames.
TC REI Processing
An 8-bit counter (An TC REI Counter, Bn TC REI Counter) is provided for counting the number of REI bits
received as equal to 1 in bit 5 (TC REI) in the N2 byte. An REI indication indicates that the distant end has
detected one or two errors when the BIP-2 calculated for frame f-1 (all the bytes) is compared against the
BIP-2 value carried in the N2 byte in frame f.
TC OEI Processing
An 8-bit counter (An TC OEI Counter, Bn TC OEI Counter) is provided for counting the number of OEI bits
received as equal to 1 in bit 6 (TC OEI) in the N2 (Z6) byte. An OEI indication (a 1) indicates that the distant
end has detected one or two errors when the BIP-2 calculated for frame f-1 is compared against the BIP-2
value carried in the V5 byte in frame f.
sor-written reference message, byte for byte, for 16 bytes (the length of the multiframe message). If they
compare, a match is declared, with no mismatch alarm (A/BnJ2TIM = 0). If they do not compare, a trace
mismatch alarm is declared (A/BnJ2TIM = 1). There is no Loss of Lock alarm (A/BnJ2LOL = 0) because
the incoming trace message is stable.
(A/BnJ2LOL = 1) occurs and the sequence starts again from the beginning (step 2).
Bit
MSB
Proprietary TranSwitch Corporation Information for use Solely by its Customers
1
BIP-2
2
DATA SHEET
3
1
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Indication
AIS
4
REI
TC
5
OEI
TC
6
7
TC RDI/ODI
Trace ID
8
LSB