Method and apparatus for extending...

Details Method and apparatus for extending... Method and apparatus for extending...

1998-10-28

2004-09-21

Pezzlo, John (Department: 2663)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S395510, C370S469000, C370S474000, C370S476000, C375S222000, C709S203000, C709S227000

Reexamination Certificate

active

06795438

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to broadband modems. More specifically, the present invention relates to a method and apparatus for extending Point-to-Point Protocol (PPP)/Asynchronous Transfer Mode (ATM) services to client computer systems.
BACKGROUND OF THE INVENTION
Broadband data transmission supports high bandwidth throughput through the use of multiple channels over a single transmission medium at one time. Multiple channels are supported on the single transmission medium through frequency division multiplexing. Broadband data transmission technologies include Integrated Services Digital Network (ISDN) and Asymmetric Digital Subscriber Line (ADSL).
ADSL is a new modem technology that converts existing twisted-pair telephone lines into access paths for multimedia and high speed data communications. ADSL supports data rates of up to 8 Mbps downstream to the user and up to 1.5 Mbps upstream from the user. An ADSL circuit connects an ADSL modem on each end of a twisted-pair telephone line, creating three information channels, a high speed downstream channel, a medium speed upstream channel, and a plain old telephone service (POTS) channel.
Current ADSL modems that support ATM network technology require sufficient processing and memory resources in order to perform the necessary ATM signaling procedures and segmentation and reassembly (SAR) functionality. In addition, in order to support a point-to-point protocol for connecting a client system to the Internet, ADSL modems require sufficient processing and memory resources to run a Layer Two Tunneling Protocol (L2TP) over a User Datagram Protocol/Internet Protocol. The L2TP enables Internet service providers to operate virtual private networks (VPNs).
FIG. 1
illustrates the modules that a conventional ADSL modem
100
supports in providing PPP/ATM services to a client computer system
160
. The ADSL modem
100
supports a UDP/IP stack
110
and a L2TP stack
120
on a first side that is connected to the client computer system
160
via modem-client connection
150
. The ADSL modem
100
also supports an ATM protocol stack
130
on a second side connected to the ADSL physical interface
140
. The ATM protocol stack
130
includes an ATM layer
131
, segmentation and re-assembly layer (SAR)
132
, ATM adaptation layer (AAL)
133
, and a signaling (SIG) layer
134
. Data received from the ADSL physical interface
140
is processed by the ATM protocol stack
130
on the ADSL modem
100
to retrieve raw data from the payload of an ATM cell. Similarly, data received from the client computer system
160
to be transmitted on the ADSL physical interface
140
is processed by the ATM protocol stack
130
on the ADSL modem
100
to appropriately format the data into ATM cells.


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