VSC9112 데이터 시트보기 (PDF) - Vitesse Semiconductor

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VSC9112

STS-48c Physical Layer Packet/ATM Over SONET/SDH Device

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

STS-48c Physical Layer

Packet/ATM Over SONET/SDH Device

Datasheet

VSC9112

• It is possible to forced insert all "1"s into the data stream, before scrambling, with the exception of the sec-

tion overhead. The AIS-L condition can be automatically inserted through activity from the special pur-

pose serial interfaces.

• The Section BIP-8 code is computed and can be placed in the B1 byte of the current frame. It is possible

to insert B1 errors for diagnostics purposes.

• The A1 and A2 framing bytes can be inserted into the frame. It is also possible to introduce bit errors in

the framing word.

• The J0 byte supports both SONET and SDH formats. The J0 byte can be programmed to a fixed value for

interworking with older equipment implementing the C1 indentification byte.

• The Z0 growth bytes supports both SONET and SDH formats. The Z0 bytes can be programmed to carry

the C1 identification bytes for interworking with older equipment.

• The outgoing data stream is optionally scrambled using the generating polynomial 1 + x6 + x7 with a

sequence length of 127.

• It is possible to force insert all “0”s in the outgoing data stream after scrambling for diagnostic purposes

(LOS).

• Bytes input to the special purpose ports of the TOAP can be inserted into the D1-D3, E1, F1 and J0 bytes

of the outgoing Section overhead.

• All bytes in the section overhead that are reserved for national or future international standardization use

can be overwritten with 0x00.

• A frame pulse is provided for the outgoing data stream and is programmable.

Receive Overhead Access Port (ROAP)

• Two identical, but independent, special purpose ports are provided for the extraction of special purpose

bytes from the SONET/SDH transport overhead and of certain SONET/SDH alarms specific to automatic

protection switching (APS) applications.

• The frame pulse RSPFP is synchronized to the receive drop side frame pulses RXFPOUTA-D.

• The entire section/line transport overhead can be extracted from the serial output port RTOH[3..0].

Transmit Overhead Access Port (TOAP)

• Two identical, but independent, special purpose ports are provided for the insertion of special purpose

bytes into the SONET/SDH transport overhead and of certain SONET/SDH alarms specific to automatic

protection switching (APS) applications.

• The entire transport overhead is captured from the serial input ports TTOH[3..0]. The captured data can

be selectively inserted into the corresponding overhead bytes of the transmitted SONET/SDH frame.

SONET/SDH Section Trace Buffers (SSTB)

• Three different Section Trace Message (J0) formats are supported in both transmit and receive directions:

one byte (SONET) message, 16 byte (SDH) message, and 64 byte (SONET CLLI) message.

Page 8

© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

G52210-0, Rev. 4.3

3/30/00

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