XRT94L33IB-L Exar Corporation, XRT94L33IB-L Datasheet - Page 394

• Manufacturer Part Number: XRT94L33IB-L
• Description: IC MAPPER DS3/E3/STS-1 504TBGA
• Manufacturer: Exar Corporation

Specifications of XRT94L33IB-L

• Applications: Network Switches
• Interface: Bus
• Voltage - Supply: 3.14 V ~ 3.47 V
• Package / Case: 504-LBGA
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

XRT94L33
Rev.1.2.0.
Figure 92 Illustration of the Functional Block Diagram of the XRT94L33 Mapper IC; with the Receive
SONET POH Processor block highlighted
2.3.3.1
As the XRT94L33 receives an incoming STS-3 data-stream, the Receive STS-3 TOH Processor block has the
responsibility of de-scrambling this incoming data-stream, and acquiring and maintaining frame
synchronization with the incoming STS-3 frames. Once these incoming STS-3 frames have been located; the
Receive SONET POH Processor block has the responsibility of locating and keeping track of the STS-1 SPEs
within this STS-3 data-stream.
As required by the SONET/SDH standards, the Receive SONET POH Processor blocks accomplish this by
monitoring the contents of each set of H1 and H2 bytes within the incoming STS-3 data-stream.
If a Given Channel is Receiving an STS-1 Signal
If a given channel is configured to receive an STS-1 signal, then each incoming STS-3 frame consists of a
single STS-1 SPE. The Receive SONET POH Processor block determines the location of this one STS-1
SPE by the contents of the H1 and H2 byte the TOH of the incoming STS-1 data-stream.
The H1 and H2 Bytes within an STS-1 Signal
XRT95L34 – Channel 0
STS-3/12
Interface
STS-3/12
Telecom
Interface
STS-3/12
Interface
STS-3/12
Telecom
Interface
STS-3/12
PECL
Block
Block
STS-3/12
PECL
Block
Bus
Block
Block
CDR
Block
Bus
CDR
POINTER PROCESSING
Processor
Transmit
STS-3/12
Processor
Processor
Transmit
STS-3/12
STS-3/12
Processor
Block
Receive
STS-3/12
TOH
Microprocessor
Block
Receive
Block
TOH
TOH
Microprocessor
Block
TOH
Interface
Interface
Block
Block
3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET
Processor
Processor
Transmit
STS-3/12
STS-3/12
Processor
Processor
Transmit
Receive
STS-3/12
STS-3/12
Block
Receive
Block
POH
POH
Block
Block
Synthesizer
POH
POH
Synthesizer
Clock
Block
Clock
Block
394
Cell Processor
Cell Processor
Cell Processor
Cell Processor
Processor
Processor
Transmit
Processor
Processor
Transmit
Transmit
Receive
Receive
Transmit
Block
Receive
Block
Receive
Block
ATM
PPP
PPP
Block
Block
Block
ATM
Block
ATM
PPP
PPP
Block
ATM
POS-PHY
POS-PHY
UTOPIA/
Transmit
Transmit
UTOPIA
Interface
Interface
Interface
Interface
POS-PHY
POS-PHY
UTOPIA/
Transmit
Transmit
Receive
Receive
UTOPIA
Interface
Interface
Interface
Interface
Receive
Receive
Block
Block
Block
Block
Block
Block
Block
Block
xr