Appeal No. 2004-1676
Application 09/263,918
Kwak discloses that "[a]n ATM terminal indicates a device
which performs telephone service using the ATM" (col. 1,
lines 19-20). There are four types such as AAL1, AAL2, AAL3/4,
and AAL5 in an ATM application layer (AAL) (col. 1, lines 26-27).
"[A] conventional ATM exchange employs a segmentation and
reassembly (SAR) to allow a central processing unit to process
AAL functions." (Col. 1, lines 42-44.) Kwak discloses that
"[i]n the conventional apparatus, however, the part for
processing the ATM and AAL is formed in hardware, so there are
problems that the hardware must be differently configured
according to the types of the AAL, such as AAL1, AAL2, AAL3/4,
and AAL5, resulting in necessity of creating new hardware design
and board" (col. 2, lines 4-9). Kwak discloses performing SAR
and AAL functions in connection with a software SAR interface
device (SSID). The SSID does not itself perform the SAR
function, but is a hardware interface for transferring ATM cells
between the UTOPIA interface and the double port RAM under
control of the CPU (col. 3, lines 52-60; Fig. 3; col. 4,
lines 4-25), which extra hardware is not precluded by the claim
language. Segmentation and reassembly (SAR) functions are
performed by the CPU, and therefore by software, not by the SSID
and not by a hardware SAR chip. Figure 4 shows the flowchart for
segmentation of user data read from system memory using AAL1,
AAL3/4, and AAL5. Figures 5a-5d show the flowchart for
- 6 -
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 Next
Last modified: November 3, 2007