Sonet physical layer device having ATM and PPP interfaces

Details Sonet physical layer device having ATM and PPP interfaces Sonet physical layer device having ATM and PPP interfaces

1997-06-02

2000-06-13

Nguyen, Chau

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

370466, 370907, 370474, H04L 1256

Patent

active

060757884

ABSTRACT:
A single-chip synchronous optical network (SONET) physical layer device includes first, second and third interface ports. An asynchronous transfer mode (ATM) interface circuit is coupled to the first interface port. A point-to-point protocol (PPP) processing circuit is coupled to the second interface port and the ATM interface circuit. A SONET framer circuit is coupled between the ATM interface circuit and the third interface port and between the PPP processing circuit and the third interface port. The device is programmable to allow multiple standard and non-standard data transmission modes, including transmitting ATM cells in SONET payloads; PPP frames in ATM cells in SONET payloads, PPP frames from a UTOPIA interface in SONET payloads and PPP frames directly in SONET payloads.

REFERENCES:
patent: 5375121 (1994-12-01), Nishino
patent: 5414707 (1995-05-01), Johnston et al.
patent: 5600650 (1997-02-01), Oskouy
patent: 5717690 (1998-02-01), Peirce, Jr. et al.
patent: 5781320 (1998-07-01), Byers
patent: 5835036 (1998-11-01), Takefman
patent: 5835602 (1998-11-01), Lang
RFC 1619--Network Working Group W. Simpson Request for Comments: 1619 Daydreamer Category, "PPP over SONET/SDH" (May 1994), --http://andrew2.andrew.cmu.edu/rfc/rfc1619.html.
RFC 1549--Network Working Group W. Simpson, Editor Request for Comments: 1549 Daydreamer Category, PPP in HDLC Framing, (Dec. 1993), --http://andrew2.andrew.cmu.edu/rfc/rfc1549.html.
LSI Logic Promotion, "SONET/SDH Interface Core", (R20005 1995).

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