VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
VSC8150
Features
• Integrated 2.488 Gb/s Demultiplexer
• Outputs SONET/SDH Transport Overhead
• Support for Multiple SONET/SDH Rates
• B1 Calculation and Error Reporting
2.488Gb/s SONET/SDH
Overhead Monitor
• LOF/SEF Alarm Generation
• Serial Data Loopthrough Output
• 100 PQFP Package
• Single 3.3V Supply Option
General Description
The VSC8150 monitors an SONET/SDH signal in order to provide section and line data for Operations,
Administration, Maintenance, and Provisioning (OAM&P) at multiple SONET/SDH rates. Differential PECL
clock and data input receivers and a differential data output isolate the high-speed interface. Low-speed TTL
inputs and outputs allow the use of inexpensive programmable logic to perform OAM&P functions. The
VSC8150 is an ideal solution for constructing a non-intrusive SONET/SDH monitoring interface when visibil-
ity of payload data is not required.
Functional Description
The VSC8150 high-speed interface receives recovered SONET/SDH data RXSIN
+/−
and clock RXS-
CLKIN
+/−
and provides a re-timed data output RXSLBOUT
+/−
. Internally the data is framed and SEF/LOF
framing alarms generated. Incoming B1 parity is calculated and compared with the transmitted B1 value, and
detected errors are output. The 27 bytes of the first STS-1 transport overhead are descrambled and output for
processing.
VSC8150 Functional Block Diagram
DISDSCRM
RESET
RATESEL[1:0]
SELFRDET[1:0]
FRDETEN
RXSLBOUT+/-
RXSIN+/-
RXSCLKIN+/-
1:8
DMX
RXPIN[7:0]
FRAMER
DESCRAMBLER
OVERHEAD
LATCH
SOHCLK
SOHOUT[7:0]
CONTROL
&
ALARM DETECTION
RXFPOUT
RXFRERR
RXSEF
RXLOF
LOS
RXPCLKIN
B1 CHECK
311MHz INTERNAL
CLOCK SOURCE
B1ERR
G52186-0, Rev. 3.0
10/12/98
©
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
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