VSC9142 查看數據表（PDF） - Vitesse Semiconductor

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VSC9142

STS-48c Packet/ATM Over SONET/SDH Device With Integrated Mux/Demux and Clock and Data Recovery

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Datasheet

VSC9142

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

With Integrated Mux/Demux and Clock and Data Recovery

• Bytes input to the special purpose ports of the Transmit Overhead Access Port (TOAP) can be inserted

into the D4-D12, E2, S1, K1 and K2 bytes of the outgoing Line overhead.

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

be overwritten with 0x00.

• The H1, H2, and H3 bytes from the Transmit Overhead Access Port (TOAP) can be inserted into the H1,

H2, and H3 overhead bytes, or applied as an error mask to the H1, H2, and H3 overhead bytes.

Transmit Section Overhead Processor (TSOP)

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

Transmit Overhead Access Port (TOAP)

G52319-0, Rev. 3.1

6/12/00

 VITESSE SEMICONDUCTOR CORPORATION

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

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