xrt94l33 Exar Corporation, xrt94l33 Datasheet - Page 338

• Manufacturer Part Number: xrt94l33
• Description: Multi-channel, Multi-function Device Aggregates 3 Ds3/e3/sts-1 Into Oc3/stm-1
• Manufacturer: Exar Corporation

XRT94L33
Rev.1.2.0.
Receive STS-3 Transport – Auto AIS Control Register (Address = 0x1163)
Of course, if the Receive STS-3 TOH Processor block transmits the AIS-P indicator towards the Receive
STS-3c POH Processor block, then all of the following will happen.
• The Receive STS-3c POH Processor block will declare the AIS-P defect condition.
• The corresponding Receive ATM Cell Processor block will declare the LCD (Loss of Cell Delineation)
defect condition.
2.3.1.3
At any given time, the Receive STS-3 TOH Processor block is operating in either one of the following
“Framing Alignment” modes.
• In-Frame
• SEF = 1, LOF = 0
• SEF = 1, LOF = 1
• SEF = 0, LOF = 1
The Receive STS-3 TOH Processor block will transition through these various modes depending upon
whether or not it has framing alignment with the A1, A2 bytes within the incoming STS-3 frames. Each of
these “Framing Alignment” Modes will be discussed in some detail below. The overall framing alignment
state-machine (within the Receive STS-3 TOH Processor block) is as presented below in Figure 81.
Message
Transmit
Unstable
stream)
Section
(down-
AIS-P
Trace
B
upon
R/W
IT
0
7
RECEIVE STS-3 TOH PROCESSOR BLOCK FRAMING ALIGNMENT
Mismatch
Message
Transmit
stream)
Section
(down-
AIS-P
Trace
B
upon
R/W
IT
0
6
Transmit
upon SF
stream)
(down-
AIS-P
B
R/W
IT
0
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
5
Transmit
upon SD
stream)
(down-
AIS-P
B
R/W
IT
0
4
338
upon Loss
of Optical
Transmit
stream)
(down-
Carrier
AIS-P
B
R/W
IT
0
3
upon LOF
Transmit
stream)
(down-
AIS-P
B
R/W
IT
0
2
upon LOS
Transmit
stream)
(down-
AIS-P
B
R/W
IT
1
1
xr
AUTO AIS
B
R/W
IT
1
0