XRT75R12DIB-F Exar Corporation, XRT75R12DIB-F Datasheet - Page 96

• Manufacturer Part Number: XRT75R12DIB-F
• Description: Peripheral Drivers & Components (PCIs) 12 Channel 3.3V-5V temp -45 to 85C
• Manufacturer: Exar Corporation

Specifications of XRT75R12DIB-F

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 3.3 V to 5 V
• Package / Case: TBGA-420
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT75R12D
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
In general, the role/purpose of the TOH bytes is to fulfill the following functions.
The roles of most of the TOH bytes is beyond the scope of this Data Sheet and will not be discussed any
further. However, there are a three TOH bytes that are important from the stand-point of this data sheet, and
will discussed in considerable detail throughout this document. These are the H1 and H2 (e.g., the SPE
Pointer) bytes and the H3 (e.g., the Pointer Action) byte.
Figure 41
H3 bytes highlighted.
F
IGURE
To support STS-1 Frame Synchronization
To support Error Detection within the STS-1 frame
To support the transmission of various alarm conditions such as RDI-L (Line - Remote Defect Indicator) and
REI-L (Line - Remote Error Indicator)
To support the Transmission and Reception of "Section Trace" Messages
To support the Transmission and Reception of OAM&P Messages via the DCC Bytes (Data Communication
Channel bytes - D1 through D12 byte)
40. T
presents an illustration of the Byte-Format of the TOH within an STS-1 Frame, with the H1, H2 and
HE
B
9 Rows
YTE
-F
ORMAT OF THE
D10
A1
D1
H1
D4
D7
D10
B1
B2
S1
A1
D1
H1
D4
D7
B1
B2
S1
3 Byte Columns
D11
M0
A2
D2
H2
K1
D5
D8
D11
E1
M0
A2
D2
H2
K1
D5
D8
E1
TOH
WITHIN AN
D12
C1
D3
H3
K2
D6
D9
D12
F1
E2
D3
H3
K2
D6
D9
C1
F1
E2
The TOH Bytes
92
STS-1 F
Envelope Capacity
Envelope Capacity
RAME
87 Byte Columns
Bytes
Bytes
REV. 1.0.3